新增worker直接对话

agent/cancelcause.go

@@ -45,6 +45,8 @@ var (
 		"规划者调用 kill_work 主动终止了这条意图，通常表示方向跑偏或已无继续价值；意图会标记为 stopped，不会自动重新领取")
 	AbortWorkPausedByUser = cause("work_paused_by_user", "用户暂停了这条 Worker 意图",
 		"用户暂停了正在运行的 Worker。本次调用被取消，意图转为 paused；已经登记的意图、事实、漏洞和活动记录全部保留，恢复后从头重新执行")
+	AbortWorkIntervenedByUser = cause("work_intervened_by_user", "用户暂停 Worker 并发起了新对话",
+		"用户向正在运行的 Worker 发送了新的对话意图。本次调用被立即取消并短暂进入 paused；新消息作为同一会话的下一条用户消息，随后自动恢复并优先重新领取")
 	AbortWorkCancelledByUser = cause("work_cancelled_by_user", "用户取消了这条 Worker 意图",
 		"用户取消了正在运行的 Worker。本次调用被取消；Worker 退出写入区后，服务端会事务性删除该意图及其直接产生的事实、漏洞和执行记录")
 	AbortWorkFinished = cause("work_finished", "Worker 已正常结束并释放 context",

agent/planner.go

@@ -123,6 +123,7 @@ func renderPlannerTodos(items []actool.Todo) string {
 //
 //	"done"    — a worker finished intent IntentID (its output conclusion is fetched).
 //	"finding" — a worker reported a finding on intent IntentID (Detail = 摘要).
+//	"worker_message" — the human changed one Worker's direction (Detail = 新方向).
 //	"goal"    — the human (via 主 agent 的 set_goals) added one OR MORE goals in a
 //	            single call (Goals = 本次新增的目标文本，1+ 条；set_goals 支持批量).
 //	"goal_deleted" — the human deleted a goal from 总览的目标管理 (Detail = 被删目标文本).
@@ -130,14 +131,17 @@ func renderPlannerTodos(items []actool.Todo) string {
 //	"cancelled" — the human deleted intent IntentID (Detail = 删除原因). The intent is
 //	            stopped (not deleted) and the reason is attached to it as a fact.
 type TriggerEvent struct {
-	Kind     string
-	IntentID int64
-	Detail   string
-	Goals    []string // Kind=="goal" 专用：本次 set_goals 新增的目标文本（1 条或多条）
-	OldGoal  string   // Kind=="goal_edited" 专用：修改前的目标文本
-	NewGoal  string   // Kind=="goal_edited" 专用：修改后的目标文本
+	Kind       string
+	ActivityID int64  // persistent activity id; worker_message notifications use it for de-duplication
+	IntentID   int64
+	Detail     string
+	Goals      []string // Kind=="goal" 专用：本次 set_goals 新增的目标文本（1 条或多条）
+	OldGoal    string   // Kind=="goal_edited" 专用：修改前的目标文本
+	NewGoal    string   // Kind=="goal_edited" 专用：修改后的目标文本
 }
 
+const TriggerWorkerMessage = db.PlannerEventWorkerMessage
+
 // renderTriggers spells out the change(s) that fired this round: for a finished
 // worker — which intent + its output conclusion; for a finding — which intent +
 // what was found. Empty for time/heartbeat wakes. Reads the store (best-effort;
@@ -162,6 +166,9 @@ func renderTriggers(ts *db.ExplorationStore, evs []TriggerEvent) string {
 			b.WriteString(fmt.Sprintf("\n- 人修改了目标，由「%s」变为「%s」—— 请据新目标调整探索方向（原方向若已不适用请停派）。", ev.OldGoal, ev.NewGoal))
 		case "finding":
 			b.WriteString(fmt.Sprintf("\n- 意图 #%d（%s）的 worker 报告了一个 finding：%s", ev.IntentID, intentSummary(ts, ev.IntentID), ev.Detail))
+		case TriggerWorkerMessage:
+			b.WriteString(fmt.Sprintf("\n- 用户向意图 #%d（%s）的 Worker 下发了新的人工方向：%s —— 该方向已优先交给同一 Worker；后续规划必须以它替代或补充原意图描述，避免生成冲突、回退或重复方向。",
+				ev.IntentID, intentSummary(ts, ev.IntentID), truncOutput(ev.Detail, 2000)))
 		case "cancelled":
 			b.WriteString(fmt.Sprintf("\n- 意图 #%d 由用户删除，意图内容是：%s、删除原因是：%s。该意图已停止（不再执行），其原因已作为事实挂在该意图上；请据此重新规划。", ev.IntentID, intentSummary(ts, ev.IntentID), ev.Detail))
 		default: // "done"
@@ -250,6 +257,7 @@ const plannerDefaultTmpl = `你是一个授权渗透测试系统的"规划者"
 决策流程（每次唤醒）：
 1. **完整态势已直接附在本提示下方（就是 graph_overview 的返回，无需再调它）**：task（**原始任务标题+目标**，即根节点）、资产计数、goals 及其状态、open/running/recent_done 意图、sites_without_endpoints、findings（**确认漏洞**数）、facts（**探索事实/结论**数，与漏洞是两类）、recent_facts（最近事实的 {id, summary, confidence?}，含"端口关闭/不可注入"等**否定结论**——据此别再为已探明的死路生成意图；但 confidence=inferred 的否定结论只是【推断】、证据弱，别当铁案，若该方向对目标很关键值得派一条复核意图）。**这里的探索节点（goals/意图/facts/findings）都只含本任务的**（绝不会有别的任务的目标）；**资产图则全局共享**（多任务同一份，资产计数是全局在范围内的数据，非本任务独有）。需要更深的细节时才按需调：list_facts 分页列事实（最新在前，默认 20 条，可传 q 关键词过滤、before 翻页，返回带 total/has_more）、list_findings 列全部漏洞、**node_detail(id)** 取某条的完整证据/详情（列表/recent_facts 只给摘要）。
    - open_intents / running_intents / recent_done_intents——"哪些方向已经有意图在覆盖/已尝试"。每个意图还带 **parents（上游：它派生自哪些事实/意图）和 yields（下游：它产生了哪些事实/发现）**——这就是探索图的**血缘关系**，据此理解"哪些事实来自哪个方向、能否综合成新方向"。recent_facts 里每个事实带 **from_intent**（由哪个意图产生）。
+   - worker_directions——用户在 Worker 对话里对每个意图最近一次下发的人工方向（持久化、重启后仍存在）。它比该意图最初的 summary 更新；判断在跑方向、补意图和使用 steer/kill 时必须以它为准，禁止重新派发与人工方向冲突的工作。
    - sites_without_endpoints / findings——"哪些方向【可能】需要探索"。
    - 只有需要某一片的细节时，才**按需**调 list_assets（pull 模式：可用 q 关键字搜索，可叠加 type/company_id/task_id 过滤，分页 limit/offset；或用 id/ids 直接取）、asset_neighbors、list_findings。资产图全局共享，别默认拉全量。资产中可能包含非本次任务涉及到的资产，所以需要主要出现非本次任务相关的资产时忽略这些资产。
 2. 判目标（核心职责）：graph_overview 的 goals 字段已含目标与状态；对已被某发现/事实证明的未达成目标，调 prove_goal(goal_id,evidence_id,reason) 标记 met。**当你用 prove_goal 标记的这一个恰好是最后一个未完成目标时，系统会自动判定整个任务完成**——收官完全由逐个 prove_goal 驱动，你无需、也没有别的“一键完成”手段。

agent/tools.go

@@ -48,6 +48,38 @@ func compactIntents(ns []*db.Node, parentsOf, yieldsOf map[int64][]int64) []map[
 	return out
 }
 
+const workerDirectionOverviewLimit = 300
+const workerDirectionMessageRunes = 1200
+
+// compactWorkerDirections keeps the latest durable human direction for each
+// intent small enough for every Planner/Main Agent turn. The full message stays
+// available in the Worker activity trace when an unusually long direction is
+// truncated here.
+func compactWorkerDirections(items []db.WorkerDirection) []map[string]any {
+	out := make([]map[string]any, 0, len(items))
+	for _, item := range items {
+		message := item.Message
+		truncated := false
+		if runes := []rune(message); len(runes) > workerDirectionMessageRunes {
+			message = string(runes[:workerDirectionMessageRunes]) + "…"
+			truncated = true
+		}
+		row := map[string]any{
+			"activity_id":    item.ActivityID,
+			"intent_id":      item.IntentID,
+			"intent_state":   item.IntentState,
+			"intent_summary": item.IntentSummary,
+			"message":        message,
+			"updated_at":     item.CreatedAt,
+		}
+		if truncated {
+			row["truncated"] = true
+		}
+		out = append(out, row)
+	}
+	return out
+}
+
 // ToolSet exposes the PG-backed dual graph (asset + exploration) to an LLM agent.
 // One ToolSet is created per planner/worker run; per-run signals live here.
 type ToolSet struct {
@@ -360,6 +392,14 @@ func (t *ToolSet) graphOverview() actool.CoreTool {
 // an empty context and always needs this first).
 func (t *ToolSet) graphOverviewData() map[string]any {
 	out := map[string]any{}
+	// worker_directions is the persistent cross-agent steering channel. It has
+	// one latest accepted human message per local intent, so Planner and Main
+	// Agent do not have to infer a changed direction from the original summary.
+	if directions, err := t.ts.LatestWorkerDirections(workerDirectionOverviewLimit); err == nil {
+		out["worker_directions"] = compactWorkerDirections(directions)
+	} else {
+		out["worker_directions"] = []map[string]any{}
+	}
 	// goals summary folded in so the planner needn't call list_goals each round.
 	goals, _ := t.ts.ListByKind(db.KindGoal, 100)
 	gsum := make([]map[string]any, 0, len(goals))

agent/worker.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path/filepath"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/Autumn-27/artex/db"
@@ -68,6 +69,30 @@ type Worker struct {
 	nonStreamingFn func() bool
 }
 
+// WorkerSessionID returns the stable transcript key used by a worker intent.
+// Worker slots are reusable, so the intent id (rather than work#N) is the
+// session identity. Keep this helper public so the Worker message API and UI
+// can refer to exactly the conversation that will be resumed.
+func WorkerSessionID(explorationID, intentID int64) string {
+	return fmt.Sprintf("exp%d-worker-i%d", explorationID, intentID)
+}
+
+const workerChatMarkerPrefix = "<!-- ARTEX_WORKER_CHAT:"
+
+func workerChatMarker(requestID string) string {
+	return workerChatMarkerPrefix + requestID + " -->"
+}
+
+func hasWorkerChatMessage(messages []llm.Message, requestID string) bool {
+	marker := workerChatMarker(requestID)
+	for _, message := range messages {
+		if message.Role == llm.RoleUser && strings.Contains(message.Text(), marker) {
+			return true
+		}
+	}
+	return false
+}
+
 // SetNonStreaming wires a resolver deciding whether runs use the non-streaming
 // model path (true = non-streaming). nil/unset = streaming (default). Read per
 // run so a profile or task-chain toggle takes effect without rebuilding.
@@ -274,6 +299,18 @@ func renderWorkerGraphOverview(data map[string]any) string {
 // explored but persisted nothing isn't mistaken for done, and the engine can log
 // facts/assets/findings separately instead of lumping them under "facts").
 func (w *Worker) Execute(ctx context.Context, name string, taskID int64, as *db.AssetStore, ts *db.ExplorationStore, intent *db.Node, hooks harness.HookRunner, emit func(db.Activity), enr EnrichTrigger, notifyFinding func(int64, string)) (harness.TerminalReason, WriteCounts, error) {
+	return w.execute(ctx, name, taskID, as, ts, intent, hooks, emit, enr, notifyFinding, "", "")
+}
+
+// ExecuteWithMessage runs the next turn in the same intent conversation with a
+// human-authored message. The HTTP handler does not edit the transcript;
+// agentcore records the message as a normal user turn when this Worker starts.
+// This keeps Worker continuation identical to the regular agent chat flow.
+func (w *Worker) ExecuteWithMessage(ctx context.Context, name string, taskID int64, as *db.AssetStore, ts *db.ExplorationStore, intent *db.Node, hooks harness.HookRunner, emit func(db.Activity), enr EnrichTrigger, notifyFinding func(int64, string), requestID, message string) (harness.TerminalReason, WriteCounts, error) {
+	return w.execute(ctx, name, taskID, as, ts, intent, hooks, emit, enr, notifyFinding, strings.TrimSpace(requestID), strings.TrimSpace(message))
+}
+
+func (w *Worker) execute(ctx context.Context, name string, taskID int64, as *db.AssetStore, ts *db.ExplorationStore, intent *db.Node, hooks harness.HookRunner, emit func(db.Activity), enr EnrichTrigger, notifyFinding func(int64, string), requestID, message string) (harness.TerminalReason, WriteCounts, error) {
 	tsx := NewToolSet(ts, name)
 	tsx.SetTaskID(taskID)
 	coverageEnabled := as == nil || as.CoverageEnabled(taskID)
@@ -358,7 +395,7 @@ func (w *Worker) Execute(ctx context.Context, name string, taskID int64, as *db.
 	}
 	if w.tx != nil { // persist raw LLM conversation; one file per worked intent
 		opts.Transcript = w.tx
-		opts.SessionID = fmt.Sprintf("exp%d-worker-i%d", ts.ID(), intent.ID)
+		opts.SessionID = WorkerSessionID(ts.ID(), intent.ID)
 	}
 	intentID := intent.ID
 	emitWrap := func(r db.Activity) {
@@ -398,11 +435,26 @@ func (w *Worker) Execute(ctx context.Context, name string, taskID int64, as *db.
 	// being re-run. The transcript ID is deterministic per intent, so if a prior
 	// session exists the worker continues from where it left off instead of
 	// restarting from scratch.
+	alreadyRecorded := false
 	if w.tx != nil {
 		_ = s.Resume(opts.SessionID)
-		if len(s.Messages()) > 0 {
+		alreadyRecorded = requestID != "" && hasWorkerChatMessage(s.Messages(), requestID)
+		if len(s.Messages()) > 0 && message == "" {
 			seedUnlockFromHistory(s.Messages(), def.UnlockSkill)
 			input = "继续执行。"
+		} else if len(s.Messages()) > 0 {
+			seedUnlockFromHistory(s.Messages(), def.UnlockSkill)
+		}
+	}
+	if message != "" {
+		if alreadyRecorded {
+			input = "继续执行上一次人工对话输入的新意图。不要重复已经完成的动作。"
+		} else if len(s.Messages()) > 0 {
+			input = workerChatMarker(requestID) + "\n【人工对话输入的新意图】\n" + message +
+				"\n\n请立即按这条人工输入执行，完成后再根据上下文决定原任务是否需要继续。"
+		} else {
+			input += "\n\n" + workerChatMarker(requestID) + "\n【人工对话输入的新意图】\n" + message +
+				"\n\n请优先执行这条人工输入。"
 		}
 	}
 

agent/worker_intervention_test.go

@@ -0,0 +1,28 @@
+package agent
+
+import (
+	"testing"
+
+	"github.com/Autumn-27/norma/llm"
+)
+
+func TestWorkerSessionIDIsStablePerIntent(t *testing.T) {
+	if got := WorkerSessionID(12, 34); got != "exp12-worker-i34" {
+		t.Fatalf("session id = %q, want exp12-worker-i34", got)
+	}
+}
+
+func TestWorkerChatMarkerOnlyMatchesItsNormalUserTurn(t *testing.T) {
+	requestID := "worker-message-123"
+	messages := []llm.Message{
+		{Role: llm.RoleAssistant, Content: []llm.ContentBlock{llm.TextBlock(workerChatMarker(requestID))}},
+		llm.UserText(workerChatMarker("worker-message-other") + "\nother"),
+		llm.UserText(workerChatMarker(requestID) + "\nnew intent"),
+	}
+	if !hasWorkerChatMessage(messages, requestID) {
+		t.Fatal("expected the matching user turn to be detected")
+	}
+	if hasWorkerChatMessage(messages, "worker-message-missing") {
+		t.Fatal("unrelated request id matched a Worker user turn")
+	}
+}

db/exploration.go

@@ -14,6 +14,11 @@ import (
 // it to distinguish an expected control race (HTTP 409) from a storage failure.
 var ErrIntentStateConflict = errors.New("intent state changed concurrently")
 
+// ErrIntentInterventionConflict marks a rejected or conflicting worker
+// intervention request. It covers state races, a reused request id with a
+// different payload, and a second request trying to overtake a pending one.
+var ErrIntentInterventionConflict = errors.New("intent intervention conflict")
+
 // utf8Clean makes a string safe for a PostgreSQL text column. It (1) replaces
 // invalid UTF-8 byte sequences with U+FFFD and (2) strips NUL (0x00) bytes.
 // Tool output (nmap/curl/… stdout) can carry raw/truncated bytes that PostgreSQL's
@@ -330,6 +335,437 @@ WHERE id=$2 AND exploration_id=$3 AND kind='intent' AND state=$4`, state, id, s.
 	return n == 1, err
 }
 
+const (
+	IntentInterventionPending  = "pending"
+	IntentInterventionAccepted = "accepted"
+	IntentInterventionRejected = "rejected"
+	PlannerEventWorkerMessage  = "worker_message"
+)
+
+// IntentIntervention is the durable control record for one human interruption.
+// It deliberately lives in activity rather than a new table: activity already
+// participates in task archive/restore, and the accepted row is also the user
+// turn rendered in the intent transcript.
+type IntentIntervention struct {
+	RequestID   string
+	Message     string
+	Status      string
+	ActivityID  int64
+	IntentID    int64
+	IntentState string
+	CreatedAt   time.Time
+}
+
+// WorkerDirection is the latest accepted human direction for one Worker
+// intent. The accepted activity is the durable planning event, so this view
+// survives restarts and is shared by Planner and Main Agent context builders.
+type WorkerDirection struct {
+	ActivityID   int64
+	IntentID     int64
+	RequestID    string
+	Message      string
+	IntentState  string
+	IntentSummary string
+	CreatedAt    time.Time
+}
+
+// lockIntentIntervention serializes request-id reservation/finalization across
+// processes. exploration_nodes.id is a global primary key, so the intent id is
+// sufficient input to the namespaced advisory key.
+func lockIntentIntervention(tx *sql.Tx, intentID int64) error {
+	_, err := tx.Exec(`SELECT pg_advisory_xact_lock(hashtextextended('artex-intent-intervention:' || $1::text, 0))`, intentID)
+	return err
+}
+
+func scanIntentIntervention(row *sql.Row) (*IntentIntervention, error) {
+	var it IntentIntervention
+	err := row.Scan(&it.ActivityID, &it.RequestID, &it.Message, &it.Status,
+		&it.IntentID, &it.IntentState, &it.CreatedAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &it, nil
+}
+
+// IntentInterventionByRequest finds a prior reservation/acceptance. Callers do
+// this before ordinary lifecycle validation so retrying an already accepted
+// request remains idempotent even if the worker has since finished naturally.
+func (s *ExplorationStore) IntentInterventionByRequest(intentID int64, requestID string) (*IntentIntervention, error) {
+	return scanIntentIntervention(s.db.QueryRow(`
+SELECT COALESCE(NULLIF(a.metadata->>'accepted_activity_id','')::bigint, a.id),
+       COALESCE(a.metadata->>'intervention_request_id',''),
+       COALESCE(a.metadata->>'intervention_message', a.detail, ''),
+       COALESCE(a.metadata->>'intervention_status',''),
+       n.id, n.state, a.created_at
+FROM activity a
+JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
+WHERE a.exploration_id=$1 AND a.node_id=$2
+  AND a.metadata->>'intervention_request_id'=$3
+ORDER BY a.id
+LIMIT 1`, s.expID, intentID, requestID))
+}
+
+// ReserveIntentIntervention durably claims a request id while the intent is
+// still running. A hidden intervention_control activity is the write-ahead
+// record; acceptance inserts a newer visible kind='user' row so SSE cursors can
+// never skip a message whose control reservation had an older id.
+func (s *ExplorationStore) ReserveIntentIntervention(intentID int64, requestID, message string) (*IntentIntervention, error) {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	defer tx.Rollback()
+	if err := lockIntentIntervention(tx, intentID); err != nil {
+		return nil, err
+	}
+
+	existing, err := scanIntentIntervention(tx.QueryRow(`
+SELECT COALESCE(NULLIF(a.metadata->>'accepted_activity_id','')::bigint, a.id),
+       COALESCE(a.metadata->>'intervention_request_id',''),
+       COALESCE(a.metadata->>'intervention_message', a.detail, ''),
+       COALESCE(a.metadata->>'intervention_status',''),
+       n.id, n.state, a.created_at
+FROM activity a
+JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
+WHERE a.exploration_id=$1 AND a.node_id=$2
+  AND a.metadata->>'intervention_request_id'=$3
+ORDER BY a.id
+LIMIT 1`, s.expID, intentID, requestID))
+	if err != nil {
+		return nil, err
+	}
+	if existing != nil {
+		if existing.Message != message {
+			return nil, fmt.Errorf("%w: request_id 已用于不同的 Worker 消息", ErrIntentInterventionConflict)
+		}
+		if err := tx.Commit(); err != nil {
+			return nil, err
+		}
+		return existing, nil
+	}
+
+	var state string
+	if err := tx.QueryRow(`SELECT state FROM exploration_nodes
+		WHERE id=$1 AND exploration_id=$2 AND kind='intent' FOR UPDATE`, intentID, s.expID).Scan(&state); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, fmt.Errorf("%w: intent not found", ErrIntentInterventionConflict)
+		}
+		return nil, err
+	}
+	if state != "running" && state != "paused" {
+		return nil, fmt.Errorf("%w: intent state %s cannot receive a message", ErrIntentInterventionConflict, state)
+	}
+	var otherRequest string
+	err = tx.QueryRow(`SELECT COALESCE(metadata->>'intervention_request_id','')
+		FROM activity
+		WHERE exploration_id=$1 AND node_id=$2
+		  AND metadata->>'intervention_status'=$3
+		ORDER BY id LIMIT 1`, s.expID, intentID, IntentInterventionPending).Scan(&otherRequest)
+	if err != nil && err != sql.ErrNoRows {
+		return nil, err
+	}
+	if err == nil {
+		return nil, fmt.Errorf("%w: intent 已有待处理的 Worker 消息 %s", ErrIntentInterventionConflict, otherRequest)
+	}
+
+	metadata, err := json.Marshal(map[string]any{
+		"intervention":            true,
+		"intervention_handoff":    "pending",
+		"intervention_request_id": requestID,
+		"intervention_message":    message,
+		"intervention_status":     IntentInterventionPending,
+		"source":                  "user",
+	})
+	if err != nil {
+		return nil, err
+	}
+	var out IntentIntervention
+	err = tx.QueryRow(`
+INSERT INTO activity(exploration_id,node_id,worker,kind,metadata)
+VALUES ($1,$2,'system','intervention_control',$3)
+RETURNING id, created_at`, s.expID, intentID, string(metadata)).Scan(&out.ActivityID, &out.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	out.RequestID, out.Message, out.Status = requestID, message, IntentInterventionPending
+	out.IntentID, out.IntentState = intentID, state
+	if err := tx.Commit(); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+// AcceptIntentIntervention is the DB commit point: the hidden reservation
+// becomes an audited user turn in the same transaction that moves paused back
+// to open. Thus no Worker can claim the intent before its pending message and
+// visible activity are both durable.
+func (s *ExplorationStore) AcceptIntentIntervention(intentID int64, requestID, message string) (Activity, bool, error) {
+	var activity Activity
+	tx, err := s.db.Begin()
+	if err != nil {
+		return activity, false, err
+	}
+	defer tx.Rollback()
+	if err := lockIntentIntervention(tx, intentID); err != nil {
+		return activity, false, err
+	}
+
+	var controlID int64
+	var storedMessage, status, state, taskStatus string
+	var taskPaused, taskQueued bool
+	var taskDeletedAt sql.NullTime
+	var createdAt time.Time
+	err = tx.QueryRow(`
+SELECT a.id,
+       COALESCE(a.metadata->>'intervention_message', a.detail, ''),
+       COALESCE(a.metadata->>'intervention_status',''),
+       n.state, a.created_at, COALESCE(t.status,''), t.paused, t.queued, t.deleted_at
+FROM activity a
+JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
+JOIN tasks t ON t.exploration_id=a.exploration_id
+WHERE a.exploration_id=$1 AND a.node_id=$2
+  AND a.metadata->>'intervention_request_id'=$3
+	ORDER BY a.id LIMIT 1
+	FOR UPDATE OF a,n,t`, s.expID, intentID, requestID).
+		Scan(&controlID, &storedMessage, &status, &state, &createdAt,
+			&taskStatus, &taskPaused, &taskQueued, &taskDeletedAt)
+	if err == sql.ErrNoRows {
+		return activity, false, fmt.Errorf("%w: intervention reservation not found", ErrIntentInterventionConflict)
+	}
+	if err != nil {
+		return activity, false, err
+	}
+	if storedMessage != message {
+		return activity, false, fmt.Errorf("%w: request_id 已用于不同的 Worker 消息", ErrIntentInterventionConflict)
+	}
+	if status == IntentInterventionAccepted {
+		var acceptedID int64
+		if err := tx.QueryRow(`SELECT COALESCE((metadata->>'accepted_activity_id')::bigint,0),
+			COALESCE((SELECT created_at FROM activity accepted
+				WHERE accepted.id=(activity.metadata->>'accepted_activity_id')::bigint), created_at)
+			FROM activity WHERE id=$1`, controlID).Scan(&acceptedID, &createdAt); err != nil {
+			return activity, false, err
+		}
+		if acceptedID <= 0 {
+			return activity, false, fmt.Errorf("accepted intervention has no activity id")
+		}
+		if err := tx.Commit(); err != nil {
+			return activity, false, err
+		}
+		nid := intentID
+		activity.ID = acceptedID
+		activity.NodeID, activity.Worker, activity.Kind = &nid, "user", "user"
+		activity.Summary, activity.Detail, activity.CreatedAt = message, message, createdAt
+		return activity, true, nil
+	}
+	if status != IntentInterventionPending {
+		return activity, false, fmt.Errorf("%w: intervention status %s cannot be accepted", ErrIntentInterventionConflict, status)
+	}
+	if state != "paused" {
+		return activity, false, fmt.Errorf("%w: intent state %s cannot be reopened", ErrIntentInterventionConflict, state)
+	}
+	if taskPaused || taskQueued || taskDeletedAt.Valid || IsTerminal(taskStatus) {
+		return activity, false, fmt.Errorf("%w: task lifecycle changed (status=%s paused=%v queued=%v deleted=%v)",
+			ErrIntentInterventionConflict, taskStatus, taskPaused, taskQueued, taskDeletedAt.Valid)
+	}
+
+	metadata, err := json.Marshal(map[string]any{
+		"intervention":            true,
+		"intervention_request_id": requestID,
+		"intervention_message":    message,
+		"intervention_status":     IntentInterventionAccepted,
+		"planner_event":           PlannerEventWorkerMessage,
+		"source":                  "user",
+	})
+	if err != nil {
+		return activity, false, err
+	}
+	if err := tx.QueryRow(`INSERT INTO activity(
+		exploration_id,node_id,worker,kind,summary,detail,metadata)
+		VALUES ($1,$2,'user','user',$3,$3,$4)
+		RETURNING id,created_at`, s.expID, intentID, utf8Clean(message), string(metadata)).
+		Scan(&activity.ID, &createdAt); err != nil {
+		return activity, false, err
+	}
+	var acceptedMeta map[string]any
+	if err := json.Unmarshal(metadata, &acceptedMeta); err != nil {
+		return activity, false, err
+	}
+	acceptedMeta["accepted_activity_id"] = activity.ID
+	controlMetadata, err := json.Marshal(acceptedMeta)
+	if err != nil {
+		return activity, false, err
+	}
+	if _, err := tx.Exec(`UPDATE activity SET metadata=$1 WHERE id=$2`, string(controlMetadata), controlID); err != nil {
+		return activity, false, err
+	}
+	res, err := tx.Exec(`UPDATE exploration_nodes
+		SET state='open', owner=NULL, completed_at=NULL, blocked_reason=NULL
+		WHERE id=$1 AND exploration_id=$2 AND kind='intent' AND state='paused'`, intentID, s.expID)
+	if err != nil {
+		return activity, false, err
+	}
+	if n, err := res.RowsAffected(); err != nil || n != 1 {
+		if err != nil {
+			return activity, false, err
+		}
+		return activity, false, fmt.Errorf("%w: intent is no longer paused", ErrIntentInterventionConflict)
+	}
+	if err := tx.Commit(); err != nil {
+		return activity, false, err
+	}
+	nid := intentID
+	activity.NodeID, activity.Worker, activity.Kind = &nid, "user", "user"
+	activity.Summary, activity.Detail, activity.CreatedAt = message, message, createdAt
+	activity.Metadata = metadata
+	return activity, false, nil
+}
+
+// LatestWorkerDirections returns at most one accepted human direction per
+// local intent, newest directions first. It reads the visible user activity
+// rather than the hidden hand-off row so archive/restore and activity history
+// share one authoritative record.
+func (s *ExplorationStore) LatestWorkerDirections(limit int) ([]WorkerDirection, error) {
+	if limit <= 0 {
+		limit = 300
+	}
+	rows, err := s.db.Query(`
+SELECT activity_id,intent_id,request_id,message,intent_state,intent_summary,created_at
+FROM (
+	SELECT DISTINCT ON (a.node_id)
+		a.id AS activity_id,
+		a.node_id AS intent_id,
+		COALESCE(a.metadata->>'intervention_request_id','') AS request_id,
+		COALESCE(a.metadata->>'intervention_message',a.detail,'') AS message,
+		n.state AS intent_state,
+		COALESCE(n.payload->>'summary','') AS intent_summary,
+		a.created_at
+	FROM activity a
+	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
+	WHERE a.exploration_id=$1
+	  AND a.kind='user'
+	  AND n.kind='intent'
+	  AND a.metadata->>'intervention_status'=$2
+	  AND a.metadata->>'planner_event'=$3
+	ORDER BY a.node_id,a.id DESC
+) latest
+ORDER BY activity_id DESC
+LIMIT $4`, s.expID, IntentInterventionAccepted, PlannerEventWorkerMessage, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := make([]WorkerDirection, 0)
+	for rows.Next() {
+		var item WorkerDirection
+		if err := rows.Scan(&item.ActivityID, &item.IntentID, &item.RequestID, &item.Message,
+			&item.IntentState, &item.IntentSummary, &item.CreatedAt); err != nil {
+			return nil, err
+		}
+		out = append(out, item)
+	}
+	return out, rows.Err()
+}
+
+// RecoverableIntentInterventions returns control operations that must be
+// reconstructed before ordinary frontier claiming after a process restart:
+// pending transcript commits, plus accepted hand-offs not yet claimed once.
+func (s *ExplorationStore) RecoverableIntentInterventions() ([]IntentIntervention, error) {
+	rows, err := s.db.Query(`
+SELECT COALESCE(NULLIF(a.metadata->>'accepted_activity_id','')::bigint, a.id),
+       COALESCE(a.metadata->>'intervention_request_id',''),
+       COALESCE(a.metadata->>'intervention_message',''),
+       COALESCE(a.metadata->>'intervention_status',''),
+       n.id,n.state,a.created_at
+FROM activity a
+JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
+WHERE a.exploration_id=$1 AND a.kind='intervention_control'
+  AND (a.metadata->>'intervention_status'=$2 OR (
+       a.metadata->>'intervention_status'=$3
+       AND COALESCE(a.metadata->>'intervention_handoff','pending')='pending'))
+ORDER BY a.id`, s.expID, IntentInterventionPending, IntentInterventionAccepted)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := []IntentIntervention{}
+	for rows.Next() {
+		var item IntentIntervention
+		if err := rows.Scan(&item.ActivityID, &item.RequestID, &item.Message, &item.Status,
+			&item.IntentID, &item.IntentState, &item.CreatedAt); err != nil {
+			return nil, err
+		}
+		out = append(out, item)
+	}
+	return out, rows.Err()
+}
+
+// MarkIntentInterventionHandoffClaimed records that the accepted instruction
+// has been preferentially claimed once. Idempotency status remains accepted.
+func (s *ExplorationStore) MarkIntentInterventionHandoffClaimed(intentID int64) error {
+	_, err := s.db.Exec(`UPDATE activity SET metadata=jsonb_set(
+		metadata,'{intervention_handoff}',to_jsonb('claimed'::text))
+		WHERE id=(SELECT id FROM activity
+			WHERE exploration_id=$1 AND node_id=$2 AND kind='intervention_control'
+			  AND metadata->>'intervention_status'=$3
+			  AND COALESCE(metadata->>'intervention_handoff','pending')='pending'
+			ORDER BY id DESC LIMIT 1)`, s.expID, intentID, IntentInterventionAccepted)
+	return err
+}
+
+// PendingIntentInterventionMessage returns the accepted human chat turn that
+// should be consumed by the next Worker run. The handoff remains pending until
+// the run has actually started, so a process restart can reconstruct the
+// directed claim without losing the user's message.
+func (s *ExplorationStore) PendingIntentInterventionMessage(intentID int64) (string, string, bool, error) {
+	var requestID, message string
+	err := s.db.QueryRow(`SELECT
+		COALESCE(metadata->>'intervention_request_id',''),
+		COALESCE(metadata->>'intervention_message','')
+		FROM activity
+		WHERE exploration_id=$1 AND node_id=$2 AND kind='intervention_control'
+		  AND metadata->>'intervention_status'=$3
+		  AND COALESCE(metadata->>'intervention_handoff','pending')='pending'
+		ORDER BY id DESC LIMIT 1`, s.expID, intentID, IntentInterventionAccepted).
+		Scan(&requestID, &message)
+	if err == sql.ErrNoRows {
+		return "", "", false, nil
+	}
+	if err != nil {
+		return "", "", false, err
+	}
+	return requestID, message, true, nil
+}
+
+// RejectIntentIntervention closes a pending control reservation without making
+// it visible in task activity. It is used when lifecycle validation changes or
+// the transcript could not be made durable; a different future request is then
+// free to proceed after the user explicitly resumes the paused intent.
+func (s *ExplorationStore) RejectIntentIntervention(intentID int64, requestID, reason string) error {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if err := lockIntentIntervention(tx, intentID); err != nil {
+		return err
+	}
+	_, err = tx.Exec(`UPDATE activity
+		SET metadata=jsonb_set(jsonb_set(metadata,'{intervention_status}',to_jsonb($1::text)),
+			'{intervention_reject_reason}',to_jsonb($2::text))
+		WHERE exploration_id=$3 AND node_id=$4
+		  AND metadata->>'intervention_request_id'=$5
+		  AND metadata->>'intervention_status'=$6`,
+		IntentInterventionRejected, utf8Clean(reason), s.expID, intentID, requestID, IntentInterventionPending)
+	if err != nil {
+		return err
+	}
+	return tx.Commit()
+}
+
 // IntentCleanup summarizes the blackboard records removed when a user cancels
 // one worker intent. Global assets and traffic are deliberately not part of this
 // operation; exploration anchors disappear only because their owning nodes do.
@@ -1006,7 +1442,8 @@ func (d *DB) TokenTotalsAll() (map[int64]TokenUsage, error) {
 // Persisted (unlike Engine.LastActivity's in-memory map), so it survives restarts
 // and gives终态任务 a stable "ran until" time for computing run duration.
 func (d *DB) LastActivityAll() (map[int64]int64, error) {
-	rows, err := d.Query(`SELECT exploration_id, EXTRACT(EPOCH FROM MAX(created_at))::bigint FROM activity GROUP BY exploration_id`)
+	rows, err := d.Query(`SELECT exploration_id, EXTRACT(EPOCH FROM MAX(created_at))::bigint
+		FROM activity WHERE kind IS DISTINCT FROM 'intervention_control' GROUP BY exploration_id`)
 	if err != nil {
 		return nil, err
 	}
@@ -1057,7 +1494,7 @@ func (d *DB) TaskListMetricsAll() (map[int64]TaskListMetrics, error) {
 		LEFT JOIN LATERAL (
 			SELECT EXTRACT(EPOCH FROM created_at)::bigint AS created_at
 			FROM activity
-			WHERE exploration_id=task.exploration_id
+			WHERE exploration_id=task.exploration_id AND kind IS DISTINCT FROM 'intervention_control'
 			ORDER BY created_at DESC
 			LIMIT 1
 		) latest_activity ON true
@@ -1188,10 +1625,10 @@ func (s *ExplorationStore) ActivityList(nodeID *int64, sinceID int64, limit int)
 	const cols = `id, node_id, COALESCE(worker,''), COALESCE(kind,''), COALESCE(tool,''), COALESCE(tool_use_id,''), is_error, COALESCE(summary,''), metadata, created_at, input_tokens, output_tokens, cache_read_tokens, cache_write_tokens`
 	if nodeID != nil {
 		rows, err = s.db.Query(`SELECT `+cols+`
-FROM activity WHERE exploration_id=$1 AND node_id=$2 AND id>$3 ORDER BY id LIMIT $4`, s.expID, *nodeID, sinceID, limit)
+FROM activity WHERE exploration_id=$1 AND node_id=$2 AND kind IS DISTINCT FROM 'intervention_control' AND id>$3 ORDER BY id LIMIT $4`, s.expID, *nodeID, sinceID, limit)
 	} else {
 		rows, err = s.db.Query(`SELECT `+cols+`
-FROM activity WHERE exploration_id=$1 AND id>$2 ORDER BY id LIMIT $3`, s.expID, sinceID, limit)
+FROM activity WHERE exploration_id=$1 AND kind IS DISTINCT FROM 'intervention_control' AND id>$2 ORDER BY id LIMIT $3`, s.expID, sinceID, limit)
 	}
 	if err != nil {
 		return nil, sinceID, err
@@ -1228,7 +1665,7 @@ func (s *ExplorationStore) ActivityListForTerminalIntent(nodeID, sinceID int64,
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
 	WHERE a.exploration_id=$1 AND a.node_id=$2 AND a.id>$3
 	  AND n.kind='intent' AND n.state IN ('done','blocked','exhausted','stopped')
-	  AND a.kind NOT IN ('thinking','usage')
+	  AND a.kind NOT IN ('thinking','usage','intervention_control')
 	ORDER BY a.id LIMIT $4`, s.expID, nodeID, sinceID, limit)
 	if err != nil {
 		return nil, sinceID, err
@@ -1291,7 +1728,7 @@ func (s *ExplorationStore) ActivityPage(f ActivitySessionFilter, before int64, l
 	limitArg := len(args) + 1
 	args = append(args, limit+1) // one extra row to detect older history
 	q := fmt.Sprintf(`SELECT `+cols+`
-FROM activity WHERE exploration_id=$1%s AND ($%d <= 0 OR id < $%d)
+FROM activity WHERE exploration_id=$1 AND kind IS DISTINCT FROM 'intervention_control'%s AND ($%d <= 0 OR id < $%d)
 ORDER BY id DESC LIMIT $%d`, cond, beforeArg, beforeArg, limitArg)
 	rows, err := s.db.Query(q, args...)
 	if err != nil {
@@ -1336,7 +1773,7 @@ func (s *ExplorationStore) ActivityPageForTerminalIntent(nodeID, before int64, l
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
 	WHERE a.exploration_id=$1 AND a.node_id=$2
 	  AND n.kind='intent' AND n.state IN ('done','blocked','exhausted','stopped')
-	  AND a.kind NOT IN ('thinking','usage')
+	  AND a.kind NOT IN ('thinking','usage','intervention_control')
 	  AND ($3 <= 0 OR a.id < $3)
 	ORDER BY a.id DESC LIMIT $4`, s.expID, nodeID, before, limit+1)
 	if err != nil {
@@ -1372,7 +1809,7 @@ func (s *ExplorationStore) ActivityPageForTerminalIntent(nodeID, before int64, l
 // session, since one SSE covers the whole task.
 func (s *ExplorationStore) ActivityMaxID() (int64, error) {
 	var max sql.NullInt64
-	err := s.db.QueryRow(`SELECT MAX(id) FROM activity WHERE exploration_id=$1`, s.expID).Scan(&max)
+	err := s.db.QueryRow(`SELECT MAX(id) FROM activity WHERE exploration_id=$1 AND kind IS DISTINCT FROM 'intervention_control'`, s.expID).Scan(&max)
 	if err != nil {
 		return 0, err
 	}
@@ -1382,7 +1819,7 @@ func (s *ExplorationStore) ActivityMaxID() (int64, error) {
 // ActivityDetail lazily returns the full detail blob for one step.
 func (s *ExplorationStore) ActivityDetail(id int64) (string, error) {
 	var d sql.NullString
-	err := s.db.QueryRow(`SELECT detail FROM activity WHERE id=$1 AND exploration_id=$2`, id, s.expID).Scan(&d)
+	err := s.db.QueryRow(`SELECT detail FROM activity WHERE id=$1 AND exploration_id=$2 AND kind IS DISTINCT FROM 'intervention_control'`, id, s.expID).Scan(&d)
 	if err == sql.ErrNoRows {
 		return "", nil
 	}
@@ -1415,7 +1852,7 @@ func (s *ExplorationStore) ActivityTrace(nodeID int64, limit int) ([]Activity, e
 		limit = 500
 	}
 	rows, err := s.db.Query(`SELECT `+traceCols+`
-FROM activity WHERE exploration_id=$1 AND node_id=$2 AND kind NOT IN ('thinking','usage')
+FROM activity WHERE exploration_id=$1 AND node_id=$2 AND kind NOT IN ('thinking','usage','intervention_control')
 ORDER BY id LIMIT $3`, s.expID, nodeID, limit)
 	if err != nil {
 		return nil, err
@@ -1435,7 +1872,7 @@ func (s *ExplorationStore) ActivityTraceForTerminalIntent(nodeID int64, limit in
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
 	WHERE a.exploration_id=$1 AND a.node_id=$2 AND n.kind='intent'
 	  AND n.state IN ('done','blocked','exhausted','stopped')
-	  AND a.kind NOT IN ('thinking','usage')
+	  AND a.kind NOT IN ('thinking','usage','intervention_control')
 	ORDER BY a.id LIMIT $3`, s.expID, nodeID, limit)
 	if err != nil {
 		return nil, err
@@ -1457,11 +1894,11 @@ func (s *ExplorationStore) ActivityTraceSearch(nodeID *int64, q string, limit in
 	var err error
 	if nodeID != nil {
 		rows, err = s.db.Query(`SELECT `+traceCols+`
-FROM activity WHERE exploration_id=$1 AND node_id=$2 AND kind NOT IN ('thinking','usage')
+FROM activity WHERE exploration_id=$1 AND node_id=$2 AND kind NOT IN ('thinking','usage','intervention_control')
 AND (summary ILIKE $3 OR detail ILIKE $3) ORDER BY id LIMIT $4`, s.expID, *nodeID, like, limit)
 	} else {
 		rows, err = s.db.Query(`SELECT `+traceCols+`
-FROM activity WHERE exploration_id=$1 AND node_id IS NOT NULL AND kind NOT IN ('thinking','usage')
+FROM activity WHERE exploration_id=$1 AND node_id IS NOT NULL AND kind NOT IN ('thinking','usage','intervention_control')
 AND (summary ILIKE $2 OR detail ILIKE $2) ORDER BY id LIMIT $3`, s.expID, like, limit)
 	}
 	if err != nil {
@@ -1483,7 +1920,7 @@ func (s *ExplorationStore) ActivityTraceSearchForTerminalIntent(nodeID int64, q
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
 	WHERE a.exploration_id=$1 AND a.node_id=$2 AND n.kind='intent'
 	  AND n.state IN ('done','blocked','exhausted','stopped')
-	  AND a.kind NOT IN ('thinking','usage')
+	  AND a.kind NOT IN ('thinking','usage','intervention_control')
 	  AND (a.summary ILIKE $3 OR a.detail ILIKE $3)
 	ORDER BY a.id LIMIT $4`, s.expID, nodeID, like, limit)
 	if err != nil {
@@ -1505,7 +1942,7 @@ func (s *ExplorationStore) ActivityTraceSearchTerminalIntents(q string, limit in
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
 	WHERE a.exploration_id=$1 AND n.kind='intent'
 	  AND n.state IN ('done','blocked','exhausted','stopped')
-	  AND a.kind NOT IN ('thinking','usage')
+	  AND a.kind NOT IN ('thinking','usage','intervention_control')
 	  AND (a.summary ILIKE $2 OR a.detail ILIKE $2)
 	ORDER BY a.id LIMIT $3`, s.expID, like, limit)
 	if err != nil {
@@ -1576,7 +2013,7 @@ func (s *ExplorationStore) ActivityTraceSearchExcluding(excludeNodeID int64, q s
 	like := "%" + q + "%"
 	rows, err := s.db.Query(`SELECT `+traceCols+`
 FROM activity WHERE exploration_id=$1 AND node_id IS NOT NULL AND node_id <> $2
-AND kind NOT IN ('thinking','usage')
+AND kind NOT IN ('thinking','usage','intervention_control')
 AND (summary ILIKE $3 OR detail ILIKE $3) ORDER BY id LIMIT $4`, s.expID, excludeNodeID, like, limit)
 	if err != nil {
 		return nil, err
@@ -1600,7 +2037,7 @@ func (s *ExplorationStore) ActivityByIDs(ids []int64) ([]Activity, error) {
 		args[i+1] = id
 	}
 	rows, err := s.db.Query(`SELECT id, node_id, COALESCE(kind,''), COALESCE(tool,''), is_error, COALESCE(detail,'')
-FROM activity WHERE exploration_id=$1 AND kind<>'thinking' AND id IN (`+strings.Join(ph, ",")+`) ORDER BY id`, args...)
+FROM activity WHERE exploration_id=$1 AND kind NOT IN ('thinking','intervention_control') AND id IN (`+strings.Join(ph, ",")+`) ORDER BY id`, args...)
 	if err != nil {
 		return nil, err
 	}
@@ -1634,7 +2071,7 @@ func (s *ExplorationStore) ActivityByIDsForTerminalIntents(ids []int64) ([]Activ
 	rows, err := s.db.Query(`SELECT a.id, a.node_id, COALESCE(a.kind,''), COALESCE(a.tool,''), a.is_error, COALESCE(a.detail,'')
 	FROM activity a
 	JOIN exploration_nodes n ON n.id=a.node_id AND n.exploration_id=a.exploration_id
-		WHERE a.exploration_id=$1 AND a.kind NOT IN ('thinking','usage') AND n.kind='intent'
+		WHERE a.exploration_id=$1 AND a.kind NOT IN ('thinking','usage','intervention_control') AND n.kind='intent'
 	  AND n.state IN ('done','blocked','exhausted','stopped')
 	  AND a.id IN (`+strings.Join(ph, ",")+`) ORDER BY a.id`, args...)
 	if err != nil {

db/intent_intervention_lifecycle_test.go

@@ -0,0 +1,204 @@
+package db
+
+import (
+	"encoding/json"
+	"errors"
+	"sync"
+	"testing"
+)
+
+func newRunningInterventionIntent(t *testing.T, d *DB, label string) (*ExplorationStore, int64, func()) {
+	t.Helper()
+	task, err := d.CreateTask("worker intervention "+label, "verify intervention protocol", nil, 0, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	store := d.Exploration(task.ExplorationID)
+	intentID, err := store.AddIntent(map[string]any{"summary": label}, 1, nil, "planner")
+	if err != nil {
+		_ = d.DeleteTask(task.ID)
+		t.Fatal(err)
+	}
+	if claimed, err := store.ClaimIntent(intentID, "work#1"); err != nil || !claimed {
+		_ = d.DeleteTask(task.ID)
+		t.Fatalf("claim intervention intent: claimed=%v err=%v", claimed, err)
+	}
+	return store, intentID, func() { _ = d.DeleteTask(task.ID) }
+}
+
+func TestIntentInterventionReservationAndAcceptanceAreIdempotent(t *testing.T) {
+	d, err := Open(testDSN(t))
+	if err != nil {
+		t.Skipf("postgres unavailable (%v) - skipping", err)
+	}
+	defer d.Close()
+	store, intentID, cleanup := newRunningInterventionIntent(t, d, "idempotent")
+	defer cleanup()
+
+	const requestID = "intervention-idempotent-1"
+	const message = "停止枚举，优先验证登录越权"
+	reserved, err := store.ReserveIntentIntervention(intentID, requestID, message)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if reserved.Status != IntentInterventionPending || reserved.ActivityID <= 0 || reserved.IntentState != "running" {
+		t.Fatalf("unexpected reservation: %+v", reserved)
+	}
+
+	replayed, err := store.ReserveIntentIntervention(intentID, requestID, message)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if replayed.ActivityID != reserved.ActivityID || replayed.Status != IntentInterventionPending {
+		t.Fatalf("reservation retry created a different operation: first=%+v retry=%+v", reserved, replayed)
+	}
+	if _, err := store.ReserveIntentIntervention(intentID, requestID, "改成另一条 Worker 消息"); !errors.Is(err, ErrIntentInterventionConflict) {
+		t.Fatalf("same request_id with different message error=%v, want intervention conflict", err)
+	}
+	if _, err := store.ReserveIntentIntervention(intentID, "intervention-other", message); !errors.Is(err, ErrIntentInterventionConflict) {
+		t.Fatalf("second pending request error=%v, want intervention conflict", err)
+	}
+
+	if changed, err := store.CompareAndSetIntentState(intentID, "running", "paused"); err != nil || !changed {
+		t.Fatalf("settle intent before acceptance: changed=%v err=%v", changed, err)
+	}
+	activity, duplicate, err := store.AcceptIntentIntervention(intentID, requestID, message)
+	if err != nil || duplicate {
+		t.Fatalf("accept intervention: duplicate=%v err=%v", duplicate, err)
+	}
+	if activity.ID <= reserved.ActivityID || activity.NodeID == nil || *activity.NodeID != intentID ||
+		activity.Worker != "user" || activity.Kind != "user" || activity.Summary != message || activity.Detail != message {
+		t.Fatalf("accepted audit mismatch: %+v", activity)
+	}
+	var metadata map[string]any
+	if err := json.Unmarshal(activity.Metadata, &metadata); err != nil {
+		t.Fatal(err)
+	}
+	if metadata["intervention_request_id"] != requestID || metadata["intervention_status"] != IntentInterventionAccepted {
+		t.Fatalf("accepted metadata=%v", metadata)
+	}
+	node, err := store.GetNode(intentID)
+	if err != nil || node == nil || node.State != "open" || node.Owner != "" {
+		t.Fatalf("accepted intent=%+v err=%v, want reopened and unowned", node, err)
+	}
+
+	again, duplicate, err := store.AcceptIntentIntervention(intentID, requestID, message)
+	if err != nil || !duplicate || again.ID != activity.ID {
+		t.Fatalf("accept retry: activity=%+v duplicate=%v err=%v", again, duplicate, err)
+	}
+	lookup, err := store.IntentInterventionByRequest(intentID, requestID)
+	if err != nil || lookup == nil || lookup.Status != IntentInterventionAccepted || lookup.ActivityID != activity.ID {
+		t.Fatalf("accepted lookup=%+v err=%v", lookup, err)
+	}
+	var rows int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM activity
+		WHERE exploration_id=$1 AND node_id=$2
+		  AND metadata->>'intervention_request_id'=$3`, store.ID(), intentID, requestID).Scan(&rows); err != nil {
+		t.Fatal(err)
+	}
+	if rows != 2 {
+		t.Fatalf("Worker message rows=%d, want one hidden control row and one visible user row", rows)
+	}
+	activities, cursor, err := store.ActivityList(&intentID, 0, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(activities) != 1 || activities[0].ID != activity.ID || cursor != activity.ID {
+		t.Fatalf("public activities leaked control row: activities=%+v cursor=%d", activities, cursor)
+	}
+	maxID, err := store.ActivityMaxID()
+	if err != nil || maxID != activity.ID {
+		t.Fatalf("public activity cursor=%d err=%v, want visible user row %d", maxID, err, activity.ID)
+	}
+	if detail, err := store.ActivityDetail(reserved.ActivityID); err != nil || detail != "" {
+		t.Fatalf("hidden control detail=%q err=%v", detail, err)
+	}
+}
+
+func TestIntentInterventionConcurrentReservationHasSingleDurableWinner(t *testing.T) {
+	d, err := Open(testDSN(t))
+	if err != nil {
+		t.Skipf("postgres unavailable (%v) - skipping", err)
+	}
+	defer d.Close()
+	store, intentID, cleanup := newRunningInterventionIntent(t, d, "concurrent")
+	defer cleanup()
+
+	const contenders = 12
+	const requestID = "intervention-concurrent-1"
+	const message = "只保留被动请求并验证当前假设"
+	start := make(chan struct{})
+	results := make(chan *IntentIntervention, contenders)
+	errs := make(chan error, contenders)
+	var wg sync.WaitGroup
+	for range contenders {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			<-start
+			reservation, reserveErr := store.ReserveIntentIntervention(intentID, requestID, message)
+			results <- reservation
+			errs <- reserveErr
+		}()
+	}
+	close(start)
+	wg.Wait()
+	close(results)
+	close(errs)
+	for err := range errs {
+		if err != nil {
+			t.Fatalf("concurrent reservation: %v", err)
+		}
+	}
+	var activityID int64
+	for result := range results {
+		if result == nil || result.ActivityID <= 0 {
+			t.Fatalf("invalid concurrent reservation: %+v", result)
+		}
+		if activityID == 0 {
+			activityID = result.ActivityID
+		} else if result.ActivityID != activityID {
+			t.Fatalf("concurrent requests produced activity ids %d and %d", activityID, result.ActivityID)
+		}
+	}
+	var rows int
+	if err := d.QueryRow(`SELECT COUNT(*) FROM activity
+		WHERE exploration_id=$1 AND node_id=$2
+		  AND metadata->>'intervention_request_id'=$3`, store.ID(), intentID, requestID).Scan(&rows); err != nil {
+		t.Fatal(err)
+	}
+	if rows != 1 {
+		t.Fatalf("concurrent intervention rows=%d, want 1", rows)
+	}
+}
+
+func TestIntentInterventionAcceptanceCanRetryAfterStateSettlement(t *testing.T) {
+	d, err := Open(testDSN(t))
+	if err != nil {
+		t.Skipf("postgres unavailable (%v) - skipping", err)
+	}
+	defer d.Close()
+	store, intentID, cleanup := newRunningInterventionIntent(t, d, "settlement retry")
+	defer cleanup()
+
+	const requestID = "intervention-settle-1"
+	const message = "立刻停止当前动作并检查权限边界"
+	reserved, err := store.ReserveIntentIntervention(intentID, requestID, message)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, _, err := store.AcceptIntentIntervention(intentID, requestID, message); !errors.Is(err, ErrIntentInterventionConflict) {
+		t.Fatalf("accept before worker settlement error=%v, want conflict", err)
+	}
+	pending, err := store.IntentInterventionByRequest(intentID, requestID)
+	if err != nil || pending == nil || pending.Status != IntentInterventionPending || pending.ActivityID != reserved.ActivityID {
+		t.Fatalf("failed acceptance lost reservation: pending=%+v err=%v", pending, err)
+	}
+	if changed, err := store.CompareAndSetIntentState(intentID, "running", "paused"); err != nil || !changed {
+		t.Fatalf("settle intent: changed=%v err=%v", changed, err)
+	}
+	activity, duplicate, err := store.AcceptIntentIntervention(intentID, requestID, message)
+	if err != nil || duplicate || activity.ID <= reserved.ActivityID {
+		t.Fatalf("retry acceptance: activity=%+v duplicate=%v err=%v", activity, duplicate, err)
+	}
+}

server/engine.go

@@ -75,6 +75,7 @@ const (
 )
 
 var errWorkControlConflict = errors.New("work control conflict")
+var errWorkInterventionConflict = errors.New("work intervention conflict")
 
 // retryableWorkerModelError excludes errors already handled by the task router.
 // In particular, a quota error after partial streaming advances the task cursor
@@ -130,6 +131,17 @@ type Engine struct {
 	// runWorkerStep has stopped writing and committed its final state.
 	workMu sync.Mutex
 	work   map[int64]*workExecution
+	// interventionLocks serializes reservation, cancellation and message hand-off
+	// per intent. PostgreSQL separately serializes the durable transaction steps.
+	interventionLocks sync.Map // intentID -> *sync.Mutex
+
+	// directedClaims keeps intents with a new human message ahead of the normal
+	// frontier without mutating their persisted priority. runWorkerStep installs
+	// the entry before releasing ControlWork, so a single worker slot cannot grab
+	// unrelated work in the paused->open hand-off gap.
+	directedMu     sync.Mutex
+	directedClaims map[string][]int64
+	directedReady  map[int64]bool
 
 	// steerBox queues planner course-corrections for a running work (keyed by intent
 	// id). The worker's PreToolUse hook drains it before its next tool call and hands
@@ -162,7 +174,14 @@ type taskRuntime struct {
 type workExecution struct {
 	cancel context.CancelCauseFunc
 	done   chan error
-	action string // user action: pause | cancel
+	action string // user action: pause | cancel | intervene
+}
+
+type WorkInterventionResult struct {
+	RequestID  string
+	ActivityID int64
+	State      string
+	Duplicate  bool
 }
 
 // nextPlannerRound returns the next planner round number for a task (1-based).
@@ -285,6 +304,12 @@ func (e *Engine) StopTask(taskID string) {
 	e.stamped.Delete(taskID)
 	e.inflight.Delete(taskID)
 	e.coordStarted.Delete(taskID)
+	e.directedMu.Lock()
+	for _, intentID := range e.directedClaims[taskID] {
+		delete(e.directedReady, intentID)
+	}
+	delete(e.directedClaims, taskID)
+	e.directedMu.Unlock()
 	e.deleteMu.Lock()
 	e.deleting.Delete(taskID)
 	e.deleteMu.Unlock()
@@ -390,7 +415,7 @@ func NewEngine(m *Manager) *Engine {
 	return &Engine{m: m, debounce: 800 * time.Millisecond, bc: NewBroadcaster(),
 		execCancel: map[string]context.CancelCauseFunc{}, execCtx: map[string]context.Context{},
 		work: map[int64]*workExecution{}, steerBox: map[int64][]string{},
-		runtimes: map[string]*taskRuntime{}}
+		directedClaims: map[string][]int64{}, directedReady: map[int64]bool{}, runtimes: map[string]*taskRuntime{}}
 }
 
 // registerWork records the cancel for the work currently running intentID.
@@ -425,7 +450,7 @@ func (e *Engine) detachWork(intentID int64) (action string, complete func(error)
 // worker has fully stopped writing. Cancellation cleanup is performed by the API
 // handler after this returns; pause state is committed by runWorkerStep itself.
 func (e *Engine) ControlWork(ctx context.Context, intentID int64, action string) error {
-	if action != "pause" && action != "cancel" {
+	if action != "pause" && action != "cancel" && action != "intervene" {
 		return fmt.Errorf("unsupported work action %q", action)
 	}
 	if ctx == nil {
@@ -444,8 +469,11 @@ func (e *Engine) ControlWork(ctx context.Context, intentID int64, action string)
 	run.action = action
 	done := run.done
 	cause := error(agent.AbortWorkPausedByUser)
-	if action == "cancel" {
+	switch action {
+	case "cancel":
 		cause = agent.AbortWorkCancelledByUser
+	case "intervene":
+		cause = agent.AbortWorkIntervenedByUser
 	}
 	run.cancel(cause)
 	e.workMu.Unlock()
@@ -464,6 +492,287 @@ func (e *Engine) ControlWork(ctx context.Context, intentID int64, action string)
 	}
 }
 
+func (e *Engine) lockWorkIntervention(intentID int64) func() {
+	value, _ := e.interventionLocks.LoadOrStore(intentID, &sync.Mutex{})
+	mu := value.(*sync.Mutex)
+	mu.Lock()
+	return mu.Unlock
+}
+
+func (e *Engine) validateWorkInterventionTask(t *Task, allowAdmissionPause bool) error {
+	if t == nil {
+		return fmt.Errorf("%w: task not found", errWorkInterventionConflict)
+	}
+	lifecycle := t.lifecycleSnapshot()
+	switch {
+	case e.IsDeleting(t.ID):
+		return fmt.Errorf("%w: 任务正在删除，无法向 Worker 发送消息", errWorkInterventionConflict)
+	case lifecycle.Paused || (!allowAdmissionPause && e.IsPaused(t.ID)):
+		return fmt.Errorf("%w: 任务已暂停，无法向 Worker 发送消息", errWorkInterventionConflict)
+	case lifecycle.Queued:
+		return fmt.Errorf("%w: 排队中的任务无法向 Worker 发送消息", errWorkInterventionConflict)
+	case isTerminalStatus(lifecycle.Status):
+		return fmt.Errorf("%w: 终态任务无法向 Worker 发送消息", errWorkInterventionConflict)
+	case e.isSettling(t.ID):
+		return fmt.Errorf("%w: 任务正在收尾，无法向 Worker 发送消息", errWorkInterventionConflict)
+	default:
+		return nil
+	}
+}
+
+func (e *Engine) abandonWorkIntervention(t *Task, intentID int64, requestID string, reason error) {
+	e.removeDirectedClaim(t.ID, intentID)
+	target := "open"
+	lifecycle := t.lifecycleSnapshot()
+	if e.IsDeleting(t.ID) || isTerminalStatus(lifecycle.Status) {
+		target = "stopped"
+	} else if e.isSettling(t.ID) {
+		target = "exhausted"
+	}
+	if changed, err := t.Store.CompareAndSetIntentState(intentID, "paused", target); err != nil {
+		log.Printf("[worker intervention] task %s 意图 #%d 补偿 paused->%s 失败: %v", t.ID, intentID, target, err)
+	} else if changed && target == "open" {
+		t.NotifyWorker()
+	}
+	if err := t.Store.RejectIntentIntervention(intentID, requestID, reason.Error()); err != nil {
+		log.Printf("[worker intervention] task %s 意图 #%d 标记请求 %s rejected 失败: %v", t.ID, intentID, requestID, err)
+	}
+}
+
+// InterveneWork performs the complete Worker message protocol. Once the request
+// has a durable pending reservation it no longer depends on the HTTP request
+// context: the caller supplies a server-owned bounded context so disconnects do
+// not strand the intent. The accepted DB transition is running -> paused ->
+// open, with the visible user message and reopen committed atomically.
+func (e *Engine) InterveneWork(ctx context.Context, t *Task, intentID int64, requestID, message string) (WorkInterventionResult, error) {
+	return e.interveneWork(ctx, t, intentID, requestID, message, false)
+}
+
+func (e *Engine) interveneWork(ctx context.Context, t *Task, intentID int64, requestID, message string, allowAdmissionPause bool) (WorkInterventionResult, error) {
+	out := WorkInterventionResult{RequestID: requestID}
+	if t == nil || t.Store == nil {
+		return out, fmt.Errorf("%w: task not found", errWorkInterventionConflict)
+	}
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	unlock := e.lockWorkIntervention(intentID)
+	defer unlock()
+
+	existing, err := t.Store.IntentInterventionByRequest(intentID, requestID)
+	if err != nil {
+		return out, err
+	}
+	if existing != nil {
+		if existing.Message != message {
+			return out, fmt.Errorf("%w: request_id 已用于不同的 Worker 消息", errWorkInterventionConflict)
+		}
+		if existing.Status == db.IntentInterventionAccepted {
+			out.ActivityID, out.State, out.Duplicate = existing.ActivityID, existing.IntentState, true
+			if out.State == "open" && e.validateWorkInterventionTask(t, allowAdmissionPause) == nil {
+				e.queueDirectedClaim(t.ID, intentID)
+				e.readyDirectedClaim(intentID)
+				t.NotifyWorker()
+			}
+			return out, nil
+		}
+		if existing.Status != db.IntentInterventionPending {
+			return out, fmt.Errorf("%w: Worker 消息请求状态为 %s", errWorkInterventionConflict, existing.Status)
+		}
+	}
+	if err := e.validateWorkInterventionTask(t, allowAdmissionPause); err != nil {
+		lifecycle := t.lifecycleSnapshot()
+		if existing != nil && (e.IsDeleting(t.ID) || e.isSettling(t.ID) || isTerminalStatus(lifecycle.Status)) {
+			e.abandonWorkIntervention(t, intentID, requestID, err)
+		}
+		return out, err
+	}
+	_, worker := e.snapshotFor(t)
+	if worker == nil {
+		return out, fmt.Errorf("%w: worker 尚未就绪", errWorkInterventionConflict)
+	}
+	if existing == nil {
+		existing, err = t.Store.ReserveIntentIntervention(intentID, requestID, message)
+		if err != nil {
+			if errors.Is(err, db.ErrIntentInterventionConflict) {
+				return out, fmt.Errorf("%w: %v", errWorkInterventionConflict, err)
+			}
+			return out, err
+		}
+	}
+	out.ActivityID = existing.ActivityID
+
+	// A pending reservation can be recovered after a process restart. An open
+	// row is fenced back to paused before publishing the user turn; a running row
+	// is stopped through the normal live-work protocol so no late writer races us.
+	for {
+		node, getErr := t.Store.GetNode(intentID)
+		if getErr != nil {
+			return out, getErr
+		}
+		if node == nil {
+			return out, fmt.Errorf("%w: intent not found", errWorkInterventionConflict)
+		}
+		switch node.State {
+		case "running":
+			controlErr := e.ControlWork(ctx, intentID, "intervene")
+			if controlErr != nil {
+				// The per-work 30s wait may expire before the server-owned operation
+				// context. Keep waiting for the named cancellation to settle; timeout
+				// release marks the run no-handoff so a late exit cannot install a
+				// permanent directed-claim barrier behind our back. A freshly claimed
+				// intent can also be running just before registerWork; retrying closes
+				// that small claim-to-registration window.
+				for {
+					settled, readErr := t.Store.GetNode(intentID)
+					if readErr != nil {
+						return out, readErr
+					}
+					if settled != nil && settled.State == "paused" {
+						break
+					}
+					if ctx.Err() != nil || settled == nil || settled.State != "running" {
+						e.removeDirectedClaim(t.ID, intentID)
+						return out, fmt.Errorf("%w: %v", errWorkInterventionConflict, controlErr)
+					}
+					if sleepCtx(ctx, 50*time.Millisecond) {
+						e.removeDirectedClaim(t.ID, intentID)
+						return out, fmt.Errorf("%w: %v", errWorkInterventionConflict, controlErr)
+					}
+					if errors.Is(controlErr, errWorkControlConflict) {
+						controlErr = e.ControlWork(ctx, intentID, "intervene")
+					}
+				}
+			}
+		case "open":
+			changed, setErr := t.Store.CompareAndSetIntentState(intentID, "open", "paused")
+			if setErr != nil {
+				return out, setErr
+			}
+			if !changed {
+				continue
+			}
+			e.queueDirectedClaim(t.ID, intentID)
+		case "paused":
+			e.queueDirectedClaim(t.ID, intentID)
+		default:
+			e.abandonWorkIntervention(t, intentID, requestID,
+				fmt.Errorf("意图已进入 %s，无法发送新消息", node.State))
+			return out, fmt.Errorf("%w: 意图已进入 %s，无法发送新消息", errWorkInterventionConflict, node.State)
+		}
+		break
+	}
+	e.queueDirectedClaim(t.ID, intentID)
+
+	// Close lifecycle races that began while cancellation was settling. A task
+	// pause or queue preserves the pending message and paused intent for a later
+	// admission; terminal, settling and deleting transitions close the request.
+	if err := e.validateWorkInterventionTask(t, allowAdmissionPause); err != nil {
+		// The user message has not entered the transcript yet. Preserve the
+		// reservation and paused intent so the same request can be retried after a
+		// transient task pause; do not reopen it behind a terminal transition.
+		e.removeDirectedClaim(t.ID, intentID)
+		lifecycle := t.lifecycleSnapshot()
+		if e.IsDeleting(t.ID) || e.isSettling(t.ID) || isTerminalStatus(lifecycle.Status) {
+			e.abandonWorkIntervention(t, intentID, requestID, err)
+		}
+		return out, err
+	}
+	activity, duplicate, err := t.Store.AcceptIntentIntervention(intentID, requestID, message)
+	if err != nil {
+		// Keep this intent paused so a retry of the same request can safely finish;
+		// remove only the task-wide claim barrier so unrelated workers keep moving.
+		e.removeDirectedClaim(t.ID, intentID)
+		return out, err
+	}
+	if !duplicate {
+		e.publishStoredActivity(t, activity)
+		t.NotifyWorkerMessage(intentID, activity.ID, message)
+	}
+	e.readyDirectedClaim(intentID)
+	t.NotifyWorker()
+	node, err := t.Store.GetNode(intentID)
+	if err != nil {
+		return out, err
+	}
+	out.Duplicate = duplicate
+	if node != nil {
+		out.State = node.State
+	}
+	return out, nil
+}
+
+// RecoverWorkerMessages reconstructs unfinished Worker chat handoffs before
+// ordinary frontier claiming. Pending messages are fenced in paused until an
+// agent runtime is available; accepted messages regain their directed priority
+// and are consumed by ExecuteWithMessage on the next claim.
+func (e *Engine) RecoverWorkerMessages(ctx context.Context, t *Task) error {
+	return e.recoverWorkerMessages(ctx, t, false)
+}
+
+// recoverWorkerMessagesForAdmission runs while the scheduler still owns the
+// Engine pause barrier but has already committed a runnable task lifecycle. It
+// restores directed hand-offs before Resume wakes any worker, so ordinary
+// frontier work cannot overtake the human message.
+func (e *Engine) recoverWorkerMessagesForAdmission(ctx context.Context, t *Task) error {
+	return e.recoverWorkerMessages(ctx, t, true)
+}
+
+func (e *Engine) recoverWorkerMessages(ctx context.Context, t *Task, allowAdmissionPause bool) error {
+	if t == nil || t.Store == nil {
+		return nil
+	}
+	items, err := t.Store.RecoverableIntentInterventions()
+	if err != nil {
+		return err
+	}
+	lifecycle := t.lifecycleSnapshot()
+	runnable := !e.IsDeleting(t.ID) && !e.isSettling(t.ID) && !isTerminalStatus(lifecycle.Status) &&
+		!lifecycle.Paused && !lifecycle.Queued && (allowAdmissionPause || !e.IsPaused(t.ID))
+	if !runnable {
+		for _, item := range items {
+			e.removeDirectedClaim(t.ID, item.IntentID)
+		}
+		return nil
+	}
+	for _, item := range items {
+		switch item.Status {
+		case db.IntentInterventionPending:
+			if item.IntentState == "open" {
+				if changed, setErr := t.Store.CompareAndSetIntentState(item.IntentID, "open", "paused"); setErr != nil {
+					return setErr
+				} else if changed {
+					item.IntentState = "paused"
+				}
+			}
+			if _, worker := e.snapshotFor(t); worker == nil {
+				continue
+			}
+			if _, recoverErr := e.interveneWork(ctx, t, item.IntentID, item.RequestID, item.Message, allowAdmissionPause); recoverErr != nil {
+				log.Printf("[worker chat] task %s 恢复意图 #%d 待处理消息失败: %v", t.ID, item.IntentID, recoverErr)
+			}
+		case db.IntentInterventionAccepted:
+			// Reconstruct the Planner-facing event while the Worker hand-off is still
+			// pending. The durable graph_overview view remains authoritative even if
+			// this notification was already consumed before a later restart.
+			t.NotifyWorkerMessage(item.IntentID, item.ActivityID, item.Message)
+			if item.IntentState == "paused" {
+				if changed, setErr := t.Store.CompareAndSetIntentState(item.IntentID, "paused", "open"); setErr != nil {
+					return setErr
+				} else if changed {
+					item.IntentState = "open"
+				}
+			}
+			if item.IntentState == "open" {
+				e.queueDirectedClaim(t.ID, item.IntentID)
+				e.readyDirectedClaim(item.IntentID)
+				t.NotifyWorker()
+			}
+		}
+	}
+	return nil
+}
+
 // releaseWorkControl drops only this caller's reservation after its wait is
 // cancelled. The work context stays cancelled; runWorkerStep recognizes the
 // named cancellation cause and settles the intent into the recoverable paused
@@ -471,7 +780,11 @@ func (e *Engine) ControlWork(ctx context.Context, intentID int64, action string)
 func (e *Engine) releaseWorkControl(intentID int64, run *workExecution, action string) {
 	e.workMu.Lock()
 	if current := e.work[intentID]; current == run && current.action == action {
-		current.action = ""
+		if action == "intervene" {
+			current.action = "intervene_no_handoff"
+		} else {
+			current.action = ""
+		}
 	}
 	e.workMu.Unlock()
 }
@@ -610,6 +923,19 @@ func (e *Engine) emitActivity(t *Task, r db.Activity) db.Activity {
 	return r
 }
 
+// publishStoredActivity broadcasts an activity inserted by a larger DB
+// transaction, avoiding a second INSERT through emitActivity.
+func (e *Engine) publishStoredActivity(t *Task, r db.Activity) {
+	if t == nil || r.ID <= 0 {
+		return
+	}
+	if r.CreatedAt.IsZero() {
+		r.CreatedAt = time.Now()
+	}
+	e.bc.Publish(t.ID, r)
+	e.touch(t.ID)
+}
+
 // appendActivity persists one activity row, retrying briefly on write failure.
 // Concurrent planner + worker inserts into the same exploration's activity log
 // occasionally fail; a couple of quick retries recover most. Crucially, every
@@ -876,13 +1202,13 @@ func (e *Engine) workerLoop(ctx context.Context, t *Task, name string) {
 		}
 		_, worker := e.snapshotFor(t)
 		if worker == nil {
-			if sleepCtx(ctx, 1500*time.Millisecond) {
+			if waitWorker(ctx, t, 1500*time.Millisecond) {
 				return
 			}
 			continue
 		}
 		if e.IsPaused(t.ID) {
-			if sleepCtx(ctx, 1000*time.Millisecond) {
+			if waitWorker(ctx, t, 1000*time.Millisecond) {
 				return
 			}
 			continue // user-paused: don't claim/execute intents
@@ -891,13 +1217,13 @@ func (e *Engine) workerLoop(ctx context.Context, t *Task, name string) {
 			return
 		}
 		if e.isSettling(t.ID) {
-			if sleepCtx(ctx, 1000*time.Millisecond) {
+			if waitWorker(ctx, t, 1000*time.Millisecond) {
 				return
 			}
 			continue // 任务超时收尾中:不再领新意图(在跑的自行收尾,协调器等其 drain)
 		}
 		if isTerminalStatus(e.m.TaskStatus(t.ID)) {
-			if sleepCtx(ctx, 1000*time.Millisecond) {
+			if waitWorker(ctx, t, 1000*time.Millisecond) {
 				return
 			}
 			continue // 任务已终态(done/failed/timeout):停止领取遗留意图,别在完成后空跑 frontier
@@ -907,7 +1233,7 @@ func (e *Engine) workerLoop(ctx context.Context, t *Task, name string) {
 		}
 		claimed := e.runWorkerStep(ctx, t, name, worker)
 		e.decInflight(t.ID)
-		if !claimed && sleepCtx(ctx, 800*time.Millisecond) {
+		if !claimed && waitWorker(ctx, t, 800*time.Millisecond) {
 			return
 		}
 	}
@@ -946,9 +1272,31 @@ func (e *Engine) runWorkerStep(ctx context.Context, t *Task, name string, worker
 	workCtx = intercept.WithTaskContext(workCtx, t.ID, fmt.Sprintf("%s · #%d", name, iid), taskEmit)
 	hooks := steerHooks{inner: t.Guard.Hooks(), drain: func() (string, bool) { return e.drainSteer(iid) }}
 	wTaskID, _ := strconv.ParseInt(t.ID, 10, 64)
+	chatRequestID, chatMessage, hasChatMessage, chatErr := t.Store.PendingIntentInterventionMessage(intent.ID)
+	if chatErr != nil {
+		log.Printf("[worker %s] task %s 读取意图 #%d 待处理人工对话失败: %v", name, t.ID, intent.ID, chatErr)
+		if err := transitionIntentState(t.Store, intent.ID, "running", "open"); err != nil {
+			log.Printf("[worker %s] task %s 意图 #%d 人工对话读取失败后回退失败: %v", name, t.ID, intent.ID, err)
+		}
+		_, completeWork := e.detachWork(intent.ID)
+		completeWork(chatErr)
+		return true
+	}
 	e.BeginLLMCall(t.ID)
-	reason, wrote, err := worker.Execute(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding)
+	var reason harness.TerminalReason
+	var wrote agent.WriteCounts
+	var err error
+	if hasChatMessage {
+		reason, wrote, err = worker.ExecuteWithMessage(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding, chatRequestID, chatMessage)
+	} else {
+		reason, wrote, err = worker.Execute(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding)
+	}
 	e.EndLLMCall(t.ID)
+	if hasChatMessage {
+		if markErr := t.Store.MarkIntentInterventionHandoffClaimed(intent.ID); markErr != nil {
+			log.Printf("[worker %s] task %s 标记意图 #%d 人工对话已消费失败: %v", name, t.ID, intent.ID, markErr)
+		}
+	}
 	// model_error 收场 → 额外重跑几次（退避后再试）。仅在意图仍属本 work、任务
 	// 未暂停/未终止/未取消【且未进入收尾】时重试；否则让位给对应分支处理(收尾期不
 	// 再重试,避免退避挤占其他 worker 的优雅收尾窗口)。
@@ -961,7 +1309,11 @@ func (e *Engine) runWorkerStep(ctx context.Context, t *Task, name string, worker
 			break // 退避期间被取消（终止/暂停）→ 交给下方分支处理
 		}
 		e.BeginLLMCall(t.ID)
-		reason, wrote, err = worker.Execute(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding)
+		if hasChatMessage {
+			reason, wrote, err = worker.ExecuteWithMessage(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding, chatRequestID, chatMessage)
+		} else {
+			reason, wrote, err = worker.Execute(workCtx, name, wTaskID, e.m.assets, t.Store, intent, hooks, emit, e.m.enrich, t.NotifyFinding)
+		}
 		e.EndLLMCall(t.ID)
 	}
 	// Capture kill state before detachWork cancels workCtx. kill = this work's
@@ -979,6 +1331,8 @@ func (e *Engine) runWorkerStep(ctx context.Context, t *Task, name string, worker
 		switch {
 		case errors.Is(workCause, agent.AbortWorkPausedByUser):
 			action = "pause"
+		case errors.Is(workCause, agent.AbortWorkIntervenedByUser):
+			action = "intervene"
 		case errors.Is(workCause, agent.AbortWorkCancelledByUser):
 			action = "cancel"
 		}
@@ -995,6 +1349,22 @@ func (e *Engine) runWorkerStep(ctx context.Context, t *Task, name string, worker
 		e.touch(t.ID)
 		return true
 	}
+	if action == "intervene" || action == "intervene_no_handoff" {
+		controlErr = transitionIntentState(t.Store, intent.ID, "running", "paused")
+		if controlErr != nil {
+			log.Printf("[worker %s] task %s 意图 #%d 对话暂停落库失败: %v", name, t.ID, intent.ID, controlErr)
+			return true
+		}
+		// Install the directed barrier before completeWork releases ControlWork.
+		// With one worker slot this prevents its next loop from taking unrelated
+		// frontier work during the message hand-off.
+		if action == "intervene" {
+			e.queueDirectedClaim(t.ID, intent.ID)
+		}
+		log.Printf("[worker %s] task %s 意图 #%d 已暂停，等待新的对话意图", name, t.ID, intent.ID)
+		e.touch(t.ID)
+		return true
+	}
 	if action == "cancel" {
 		// Park the stopped run in paused before handing cleanup to the API. If the
 		// request disconnects after cancellation, the intent remains recoverable and
@@ -1099,7 +1469,114 @@ func sleepCtx(ctx context.Context, d time.Duration) (done bool) {
 	}
 }
 
+func waitWorker(ctx context.Context, t *Task, d time.Duration) (done bool) {
+	timer := time.NewTimer(d)
+	defer timer.Stop()
+	var wake <-chan struct{}
+	if t != nil {
+		wake = t.workerWake
+	}
+	select {
+	case <-ctx.Done():
+		return true
+	case <-wake:
+		return false
+	case <-timer.C:
+		return false
+	}
+}
+
+func (e *Engine) queueDirectedClaim(taskID string, intentID int64) {
+	if taskID == "" || intentID <= 0 {
+		return
+	}
+	e.directedMu.Lock()
+	defer e.directedMu.Unlock()
+	for _, id := range e.directedClaims[taskID] {
+		if id == intentID {
+			return
+		}
+	}
+	e.directedClaims[taskID] = append(e.directedClaims[taskID], intentID)
+	e.directedReady[intentID] = false
+}
+
+func (e *Engine) readyDirectedClaim(intentID int64) {
+	e.directedMu.Lock()
+	if _, exists := e.directedReady[intentID]; exists {
+		e.directedReady[intentID] = true
+	}
+	e.directedMu.Unlock()
+}
+
+func (e *Engine) removeDirectedClaim(taskID string, intentID int64) {
+	e.directedMu.Lock()
+	defer e.directedMu.Unlock()
+	items := e.directedClaims[taskID]
+	for i, id := range items {
+		if id != intentID {
+			continue
+		}
+		items = append(items[:i], items[i+1:]...)
+		delete(e.directedReady, intentID)
+		if len(items) == 0 {
+			delete(e.directedClaims, taskID)
+		} else {
+			e.directedClaims[taskID] = items
+		}
+		return
+	}
+}
+
+// claimDirected tries every pending human-message hand-off before ordinary work
+// frontier. blocked=true means at least one hand-off is still paused/running;
+// callers must not let a just-released single worker slot overtake it.
+func (e *Engine) claimDirected(t *Task, name string) (intent *db.Node, blocked bool) {
+	e.directedMu.Lock()
+	ids := append([]int64(nil), e.directedClaims[t.ID]...)
+	ready := make(map[int64]bool, len(ids))
+	for _, id := range ids {
+		ready[id] = e.directedReady[id]
+	}
+	e.directedMu.Unlock()
+	for _, id := range ids {
+		node, err := t.Store.GetNode(id)
+		if err != nil {
+			return nil, true
+		}
+		if node == nil {
+			e.removeDirectedClaim(t.ID, id)
+			continue
+		}
+		switch node.State {
+		case "open":
+			if !ready[id] {
+				blocked = true
+				continue
+			}
+			ok, err := t.Store.ClaimIntent(id, name)
+			if err != nil {
+				return nil, true
+			}
+			if ok {
+				e.removeDirectedClaim(t.ID, id)
+				node.State, node.Owner = "running", name
+				return node, false
+			}
+			blocked = true
+		case "paused", "running":
+			blocked = true
+		default:
+			e.removeDirectedClaim(t.ID, id)
+		}
+	}
+	return nil, blocked
+}
+
 func (e *Engine) claimNext(t *Task, name string) *db.Node {
+	if intent, blocked := e.claimDirected(t, name); intent != nil || blocked {
+		return intent
+	}
 	fr, _ := t.Store.Frontier(20)
 	for _, in := range fr {
 		if ok, _ := t.Store.ClaimIntent(in.ID, name); ok {

server/engine_cancelcause_test.go

@@ -45,6 +45,7 @@ func TestControlWorkCarriesUserActionCause(t *testing.T) {
 	}{
 		{action: "pause", code: "work_paused_by_user"},
 		{action: "cancel", code: "work_cancelled_by_user"},
+		{action: "intervene", code: "work_intervened_by_user"},
 	} {
 		t.Run(tc.action, func(t *testing.T) {
 			e := NewEngine(nil)

server/goals.go

@@ -225,6 +225,13 @@ func (s *Server) hasReadyQueuedTask(excludeID string) bool {
 }
 
 func (s *Server) startAdmittedTask(t *Task, mode string) {
+	recoverMessages := s.engine.RecoverWorkerMessages
+	if s.engine.IsPaused(t.ID) {
+		recoverMessages = s.engine.recoverWorkerMessagesForAdmission
+	}
+	if err := recoverMessages(s.ctx, t); err != nil {
+		log.Printf("[worker chat] task %s 恢复待处理人工消息失败: %v", t.ID, err)
+	}
 	if mode == "bootstrap" {
 		if !s.engine.beginTaskOperation(t.ID) {
 			return

server/intent_intervention.go

@@ -0,0 +1,125 @@
+package server
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/Autumn-27/artex/db"
+)
+
+const maxWorkerMessageBytes = 64 << 10
+
+func validWorkerMessageRequestID(id string) bool {
+	if id == "" || len(id) > 128 {
+		return false
+	}
+	for _, r := range id {
+		if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') ||
+			(r >= '0' && r <= '9') || r == '-' || r == '_' || r == '.' || r == ':' {
+			continue
+		}
+		return false
+	}
+	return true
+}
+
+// sendWorkerMessage pauses a running Worker when necessary, records one user
+// turn for its existing conversation, and immediately schedules that same
+// intent to continue. A disconnected browser cannot strand an accepted message.
+func (s *Server) sendWorkerMessage(w http.ResponseWriter, r *http.Request) {
+	t, ok := s.m.Task(r.PathValue("id"))
+	if !ok {
+		writeErr(w, http.StatusNotFound, "task not found")
+		return
+	}
+	iid, err := strconv.ParseInt(r.PathValue("iid"), 10, 64)
+	if err != nil || iid <= 0 {
+		writeErr(w, http.StatusBadRequest, "bad intent id")
+		return
+	}
+	r.Body = http.MaxBytesReader(w, r.Body, maxWorkerMessageBytes)
+	var req struct {
+		Message   string `json:"message"`
+		RequestID string `json:"request_id"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		var tooLarge *http.MaxBytesError
+		if errors.As(err, &tooLarge) {
+			writeErr(w, http.StatusRequestEntityTooLarge, "请求体过大")
+			return
+		}
+		writeErr(w, http.StatusBadRequest, "bad json: "+err.Error())
+		return
+	}
+	message := strings.TrimSpace(req.Message)
+	requestID := strings.TrimSpace(req.RequestID)
+	if message == "" {
+		writeErr(w, http.StatusBadRequest, "消息不能为空")
+		return
+	}
+	if len([]rune(message)) > 4000 {
+		writeErr(w, http.StatusBadRequest, "消息不能超过 4000 个字符")
+		return
+	}
+	if !validWorkerMessageRequestID(requestID) {
+		writeErr(w, http.StatusBadRequest, "request_id 必须是 1-128 位字母、数字、-、_、. 或 :")
+		return
+	}
+
+	if !s.engine.beginTaskOperation(t.ID) {
+		writeErr(w, http.StatusConflict, "任务正在删除，无法向 Worker 发送消息")
+		return
+	}
+	defer s.engine.decInflight(t.ID)
+
+	node, err := t.Store.GetNode(iid)
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	if node == nil {
+		if inherited, sourceErr := t.Store.GetNodeWithSources(iid); sourceErr == nil && inherited != nil && inherited.Inherited {
+			writeErr(w, http.StatusConflict, "继承意图为只读，不能发送 Worker 消息")
+			return
+		}
+		writeErr(w, http.StatusNotFound, "intent not found")
+		return
+	}
+	if node.Kind != db.KindIntent {
+		writeErr(w, http.StatusConflict, "node is not an intent")
+		return
+	}
+	base := s.ctx
+	if base == nil {
+		base = context.Background()
+	}
+	opCtx, cancel := context.WithTimeout(base, workControlWaitTimeout+15*time.Second)
+	defer cancel()
+	result, err := s.engine.InterveneWork(opCtx, t, iid, requestID, message)
+	if err != nil {
+		switch {
+		case errors.Is(err, context.DeadlineExceeded), errors.Is(err, context.Canceled):
+			writeErr(w, http.StatusGatewayTimeout, err.Error())
+		case errors.Is(err, errWorkInterventionConflict), errors.Is(err, errWorkControlConflict),
+			errors.Is(err, db.ErrIntentInterventionConflict), errors.Is(err, db.ErrIntentStateConflict):
+			writeErr(w, http.StatusConflict, err.Error())
+		default:
+			writeErr(w, http.StatusInternalServerError, err.Error())
+		}
+		return
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"id":           iid,
+		"state":        result.State,
+		"accepted":     true,
+		"activity_seq": result.ActivityID,
+		"request_id":   result.RequestID,
+		"duplicate":    result.Duplicate,
+	})
+}

server/intent_intervention_protocol_test.go

@@ -0,0 +1,378 @@
+package server
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"iter"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/Autumn-27/artex/agent"
+	"github.com/Autumn-27/artex/db"
+	"github.com/Autumn-27/norma/llm"
+	"github.com/Autumn-27/norma/transcript"
+)
+
+type workerMessageTestProvider struct{}
+
+func (workerMessageTestProvider) Stream(_ context.Context, _ llm.CompletionRequest) iter.Seq2[llm.StreamEvent, error] {
+	return func(yield func(llm.StreamEvent, error) bool) {
+		yield(llm.StreamEvent{Type: llm.SETextDelta, Text: "已按新的对话意图继续执行"}, nil)
+		yield(llm.StreamEvent{Type: llm.SEMessageDelta, StopReason: "end_turn"}, nil)
+		yield(llm.StreamEvent{Type: llm.SEMessageStop}, nil)
+	}
+}
+
+func (p workerMessageTestProvider) Complete(ctx context.Context, req llm.CompletionRequest) (llm.Message, string, llm.Usage, error) {
+	acc := llm.NewAccumulator()
+	for event, err := range p.Stream(ctx, req) {
+		if err != nil {
+			return llm.Message{}, "", llm.Usage{}, err
+		}
+		acc.Add(event)
+	}
+	return acc.Message(), acc.StopReason, acc.Usage, nil
+}
+
+type interventionProtocolFixture struct {
+	m        *Manager
+	task     *Task
+	engine   *Engine
+	worker   *agent.Worker
+	tx       *transcript.Store
+	intentID int64
+}
+
+func newInterventionProtocolFixture(t *testing.T, targetPriority int) *interventionProtocolFixture {
+	t.Helper()
+	m, err := NewManager(t.TempDir(), "")
+	if err != nil {
+		t.Skipf("postgres unavailable (%v) - skipping", err)
+	}
+	task, err := m.CreateTask("worker message protocol", "verify immediate conversation handoff", nil, 0, 0)
+	if err != nil {
+		m.Close()
+		t.Fatal(err)
+	}
+	intentID, err := task.Store.AddIntent(map[string]any{"summary": "target worker intent"}, targetPriority, nil, "planner")
+	if err != nil {
+		m.Close()
+		t.Fatal(err)
+	}
+	if claimed, err := task.Store.ClaimIntent(intentID, "work#1"); err != nil || !claimed {
+		m.Close()
+		t.Fatalf("claim target intent: claimed=%v err=%v", claimed, err)
+	}
+	tx := transcript.NewStore(m.dir + "/transcripts")
+	worker := agent.NewWorker(workerMessageTestProvider{}, "test-model", m.dir, tx, 0, 1)
+	engine := NewEngine(m)
+	engine.UseLLM(nil, worker)
+	fixture := &interventionProtocolFixture{m: m, task: task, engine: engine, worker: worker, tx: tx, intentID: intentID}
+	t.Cleanup(func() {
+		taskID, _ := strconv.ParseInt(task.ID, 10, 64)
+		_ = m.pg.DeleteTask(taskID)
+		_ = m.Close()
+	})
+	return fixture
+}
+
+// settleRegisteredIntervention emulates the ordering inside runWorkerStep after
+// a cancellation-aware provider returns: detach the live work handle, commit the
+// running->paused final state, install the directed hand-off, then release the
+// controller waiting on workExecution.done.
+func settleRegisteredIntervention(t *testing.T, f *interventionProtocolFixture) string {
+	t.Helper()
+	action, complete := f.engine.detachWork(f.intentID)
+	if action != "intervene" {
+		t.Fatalf("settled action=%q, want intervene", action)
+	}
+	if changed, err := f.task.Store.CompareAndSetIntentState(f.intentID, "running", "paused"); err != nil || !changed {
+		t.Fatalf("settle running->paused: changed=%v err=%v", changed, err)
+	}
+	f.engine.queueDirectedClaim(f.task.ID, f.intentID)
+	complete(nil)
+	return action
+}
+
+func countTranscriptWorkerMessages(t *testing.T, tx *transcript.Store, sessionID, requestID string) (int, []transcript.Record) {
+	t.Helper()
+	records, err := tx.Load(tx.MainPath(sessionID))
+	if err != nil {
+		t.Fatal(err)
+	}
+	marker := "ARTEX_WORKER_CHAT:" + requestID
+	count := 0
+	for _, record := range records {
+		if record.Message != nil && strings.Contains(record.Message.Text(), marker) {
+			count++
+		}
+	}
+	return count, records
+}
+
+func TestWorkerMessageCancelsBeforeAcceptAndContinuesSameSessionFirst(t *testing.T) {
+	f := newInterventionProtocolFixture(t, 1)
+	competitorID, err := f.task.Store.AddIntent(map[string]any{"summary": "higher priority competitor"}, 100, nil, "planner")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Pre-seed the same stable session so the message must continue its UUID
+	// chain rather than creating a worker-slot-specific conversation.
+	sessionID := agent.WorkerSessionID(f.task.ExpID, f.intentID)
+	seed := f.tx.NewWriter(sessionID, "")
+	seed.RecordMessage(llm.UserText("original intent turn"), llm.Usage{})
+	if err := seed.Err(); err != nil {
+		t.Fatal(err)
+	}
+	before, err := f.tx.Load(f.tx.MainPath(sessionID))
+	if err != nil || len(before) != 1 {
+		t.Fatalf("seed transcript records=%d err=%v", len(before), err)
+	}
+
+	workCtx, cancelWork := context.WithCancelCause(context.Background())
+	f.engine.registerWork(f.intentID, cancelWork)
+	live, unsubscribe := f.engine.Broadcaster().Subscribe(f.task.ID)
+	defer unsubscribe()
+
+	const requestID = "worker-message-engine-1"
+	const message = "停止主动枚举，立即验证登录越权"
+	type outcome struct {
+		result WorkInterventionResult
+		err    error
+	}
+	done := make(chan outcome, 1)
+	go func() {
+		result, err := f.engine.InterveneWork(context.Background(), f.task, f.intentID, requestID, message)
+		done <- outcome{result: result, err: err}
+	}()
+
+	select {
+	case <-workCtx.Done():
+		if code, _, _, _ := agent.AbortReason(workCtx); code != "work_intervened_by_user" {
+			t.Fatalf("old execution cancel code=%q, want work_intervened_by_user", code)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("Worker message did not immediately cancel the old execution")
+	}
+	select {
+	case early := <-done:
+		t.Fatalf("Worker message accepted before old worker settled: %+v", early)
+	case <-time.After(25 * time.Millisecond):
+	}
+	pending, err := f.task.Store.IntentInterventionByRequest(f.intentID, requestID)
+	if err != nil || pending == nil || pending.Status != db.IntentInterventionPending {
+		t.Fatalf("durable pending reservation=%+v err=%v", pending, err)
+	}
+	settleRegisteredIntervention(t, f)
+
+	var accepted outcome
+	select {
+	case accepted = <-done:
+	case <-time.After(2 * time.Second):
+		t.Fatal("timed out waiting for accepted Worker message")
+	}
+	if accepted.err != nil || accepted.result.ActivityID <= pending.ActivityID || accepted.result.Duplicate || accepted.result.State != "open" {
+		t.Fatalf("accepted Worker message=%+v control=%+v err=%v", accepted.result, pending, accepted.err)
+	}
+	node, err := f.task.Store.GetNode(f.intentID)
+	if err != nil || node == nil || node.State != "open" {
+		t.Fatalf("reopened target=%+v err=%v", node, err)
+	}
+
+	// The API publishes the visible user activity but never edits transcript files.
+	// agentcore appends the standard user turn only after the same Worker is claimed.
+	count, records := countTranscriptWorkerMessages(t, f.tx, sessionID, requestID)
+	if count != 0 || len(records) != 1 {
+		t.Fatalf("HTTP handler edited Worker transcript: count=%d records=%+v", count, records)
+	}
+	select {
+	case activity := <-live:
+		if activity.ID != accepted.result.ActivityID || activity.NodeID == nil || *activity.NodeID != f.intentID ||
+			activity.Worker != "user" || activity.Kind != "user" || activity.Summary != message {
+			t.Fatalf("broadcast activity=%+v", activity)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("accepted Worker message was not broadcast")
+	}
+	select {
+	case duplicate := <-live:
+		t.Fatalf("accepted Worker message broadcast twice: %+v", duplicate)
+	default:
+	}
+
+	// The directed hand-off must outrank the normal frontier without changing the
+	// persisted priority. This catches the one-worker race where the released slot
+	// used to take an unrelated, higher-priority intent before the target reopened.
+	claimed := f.engine.claimNext(f.task, "work#2")
+	if claimed == nil || claimed.ID != f.intentID {
+		t.Fatalf("directed claim=%+v, want target %d ahead of competitor %d", claimed, f.intentID, competitorID)
+	}
+	competitor, err := f.task.Store.GetNode(competitorID)
+	if err != nil || competitor == nil || competitor.State != "open" {
+		t.Fatalf("competitor was claimed before Worker message target: node=%+v err=%v", competitor, err)
+	}
+	request, nextMessage, hasMessage, err := f.task.Store.PendingIntentInterventionMessage(f.intentID)
+	if err != nil || !hasMessage || request != requestID || nextMessage != message {
+		t.Fatalf("pending Worker message request=%q message=%q present=%v err=%v", request, nextMessage, hasMessage, err)
+	}
+	taskID, _ := strconv.ParseInt(f.task.ID, 10, 64)
+	if _, _, err := f.worker.ExecuteWithMessage(context.Background(), "work#2", taskID, nil, f.task.Store,
+		claimed, nil, nil, nil, nil, request, nextMessage); err != nil {
+		t.Fatalf("continue Worker conversation: %v", err)
+	}
+	if err := f.task.Store.MarkIntentInterventionHandoffClaimed(f.intentID); err != nil {
+		t.Fatal(err)
+	}
+	count, records = countTranscriptWorkerMessages(t, f.tx, sessionID, requestID)
+	if count != 1 || len(records) != 3 || records[1].ParentUUID != records[0].UUID || records[2].ParentUUID != records[1].UUID {
+		t.Fatalf("Worker message did not form one normal chained turn: count=%d records=%+v", count, records)
+	}
+	if records[1].Message == nil || records[1].Message.Role != llm.RoleUser || !strings.Contains(records[1].Message.Text(), message) {
+		t.Fatalf("Worker message was not recorded as the next user turn: %+v", records[1])
+	}
+	if _, _, pendingAfterRun, err := f.task.Store.PendingIntentInterventionMessage(f.intentID); err != nil || pendingAfterRun {
+		t.Fatalf("Worker message handoff remains pending=%v err=%v", pendingAfterRun, err)
+	}
+
+	retry, err := f.engine.InterveneWork(context.Background(), f.task, f.intentID, requestID, message)
+	if err != nil || !retry.Duplicate || retry.ActivityID != accepted.result.ActivityID {
+		t.Fatalf("idempotent engine retry=%+v err=%v", retry, err)
+	}
+	if _, err := f.engine.InterveneWork(context.Background(), f.task, f.intentID, requestID, "同 request_id 的另一条消息"); !errors.Is(err, errWorkInterventionConflict) {
+		t.Fatalf("same request_id different message error=%v, want conflict", err)
+	}
+	count, _ = countTranscriptWorkerMessages(t, f.tx, sessionID, requestID)
+	if count != 1 {
+		t.Fatalf("engine retries appended %d Worker messages, want 1", count)
+	}
+}
+
+func TestSendWorkerMessageContinuesAfterRequestContextCancellation(t *testing.T) {
+	f := newInterventionProtocolFixture(t, 1)
+	workCtx, cancelWork := context.WithCancelCause(context.Background())
+	f.engine.registerWork(f.intentID, cancelWork)
+	s := &Server{m: f.m, engine: f.engine, ctx: context.Background()}
+
+	requestBody, _ := json.Marshal(map[string]string{
+		"message": "中止当前动作，只验证权限边界", "request_id": "worker-message-disconnect-1",
+	})
+	requestCtx, disconnect := context.WithCancel(context.Background())
+	disconnect()
+	req := httptest.NewRequest(http.MethodPost, "/api/tasks/1/intents/1/messages", bytes.NewReader(requestBody)).WithContext(requestCtx)
+	req.SetPathValue("id", f.task.ID)
+	req.SetPathValue("iid", strconv.FormatInt(f.intentID, 10))
+	recorder := httptest.NewRecorder()
+	done := make(chan struct{})
+	go func() {
+		s.sendWorkerMessage(recorder, req)
+		close(done)
+	}()
+
+	select {
+	case <-workCtx.Done():
+	case <-time.After(time.Second):
+		t.Fatal("disconnected request did not continue to cancel the worker")
+	}
+	settleRegisteredIntervention(t, f)
+	select {
+	case <-done:
+	case <-time.After(2 * time.Second):
+		t.Fatal("server-owned Worker message did not finish after browser disconnect")
+	}
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("disconnected Worker message status=%d body=%s", recorder.Code, recorder.Body.String())
+	}
+	accepted, err := f.task.Store.IntentInterventionByRequest(f.intentID, "worker-message-disconnect-1")
+	if err != nil || accepted == nil || accepted.Status != db.IntentInterventionAccepted {
+		t.Fatalf("disconnected request acceptance=%+v err=%v", accepted, err)
+	}
+}
+
+func TestWorkerMessageRejectsUnavailableTaskStatesWithoutReservation(t *testing.T) {
+	cases := []struct {
+		name  string
+		block func(*interventionProtocolFixture)
+	}{
+		{name: "paused", block: func(f *interventionProtocolFixture) {
+			f.task.updateLifecycle(func(state *taskLifecycleState) { state.Paused = true })
+			f.engine.Pause(f.task.ID, agent.AbortPausedByUser)
+		}},
+		{name: "queued", block: func(f *interventionProtocolFixture) {
+			f.task.updateLifecycle(func(state *taskLifecycleState) { state.Queued = true })
+		}},
+		{name: "terminal", block: func(f *interventionProtocolFixture) {
+			f.task.updateLifecycle(func(state *taskLifecycleState) { state.Status = "done" })
+		}},
+		{name: "settling", block: func(f *interventionProtocolFixture) { f.engine.markSettling(f.task.ID) }},
+		{name: "deleting", block: func(f *interventionProtocolFixture) { f.engine.BeginDelete(f.task.ID) }},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			f := newInterventionProtocolFixture(t, 1)
+			tc.block(f)
+			requestID := "worker-message-unavailable-" + tc.name
+			if _, err := f.engine.InterveneWork(context.Background(), f.task, f.intentID, requestID, "must not persist"); !errors.Is(err, errWorkInterventionConflict) {
+				t.Fatalf("unavailable state error=%v, want conflict", err)
+			}
+			reservation, err := f.task.Store.IntentInterventionByRequest(f.intentID, requestID)
+			if err != nil || reservation != nil {
+				t.Fatalf("unavailable state persisted reservation=%+v err=%v", reservation, err)
+			}
+			node, err := f.task.Store.GetNode(f.intentID)
+			if err != nil || node == nil || node.State != "running" {
+				t.Fatalf("unavailable state mutated intent=%+v err=%v", node, err)
+			}
+			count, _ := countTranscriptWorkerMessages(t, f.tx, agent.WorkerSessionID(f.task.ExpID, f.intentID), requestID)
+			if count != 0 {
+				t.Fatalf("unavailable state appended %d transcript interventions", count)
+			}
+		})
+	}
+}
+
+func TestWorkerWakeInterruptsLongIdlePoll(t *testing.T) {
+	task := &Task{workerWake: make(chan struct{}, 1)}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	started := make(chan struct{})
+	returned := make(chan bool, 1)
+	go func() {
+		close(started)
+		returned <- waitWorker(ctx, task, 5*time.Second)
+	}()
+	<-started
+	start := time.Now()
+	task.NotifyWorker()
+	select {
+	case stopped := <-returned:
+		if stopped {
+			t.Fatal("worker wake was mistaken for context shutdown")
+		}
+		if elapsed := time.Since(start); elapsed > 250*time.Millisecond {
+			t.Fatalf("worker wake took %s, want immediate wake", elapsed)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("worker wake waited for the idle polling interval")
+	}
+}
+
+func TestSendWorkerMessageRejectsOversizedBodyAsEntityTooLarge(t *testing.T) {
+	f := newInterventionProtocolFixture(t, 1)
+	s := &Server{m: f.m, engine: f.engine, ctx: context.Background()}
+	body := `{"message":"` + strings.Repeat("x", maxWorkerMessageBytes) + `","request_id":"oversized"}`
+	req := httptest.NewRequest(http.MethodPost, "/api/tasks/1/intents/1/messages", strings.NewReader(body))
+	req.SetPathValue("id", f.task.ID)
+	req.SetPathValue("iid", strconv.FormatInt(f.intentID, 10))
+	recorder := httptest.NewRecorder()
+	s.sendWorkerMessage(recorder, req)
+	if recorder.Code != http.StatusRequestEntityTooLarge {
+		t.Fatalf("oversized Worker message status=%d body=%s", recorder.Code, recorder.Body.String())
+	}
+}

server/manager.go

@@ -63,6 +63,7 @@ type Task struct {
 	Store                *pgdb.ExplorationStore `json:"-"`
 	Guard                *guard.Guard           `json:"-"`
 	notify               chan struct{}
+	workerWake           chan struct{}
 	lifecycleMu          sync.RWMutex
 	llmMu                sync.RWMutex
 
@@ -737,7 +738,7 @@ func taskFromPG(pt *pgdb.Task, store *pgdb.ExplorationStore, ic *intercept.Inter
 		TimeoutSeconds: pt.TimeoutSeconds, PlanHeartbeatSeconds: pt.PlanHeartbeatSeconds,
 		CoverageEnabled: pt.CoverageEnabled,
 		FirstRunAt:      unixOrZero(pt.FirstRunAt), DeadlineAt: unixOrZero(pt.DeadlineAt),
-		Store: store, Guard: guard.NewWithInterceptor(ic), notify: make(chan struct{}, 1),
+		Store: store, Guard: guard.NewWithInterceptor(ic), notify: make(chan struct{}, 1), workerWake: make(chan struct{}, 64),
 	}
 }
 
@@ -1638,6 +1639,42 @@ func (t *Task) Notify() {
 	}
 }
 
+// NotifyWorker wakes one idle execution slot without itself scheduling a Planner
+// round. Worker-message acceptance separately records a persistent planning event
+// and calls NotifyWorkerMessage; keeping execution wake-up independent prevents
+// Planner debounce from delaying the directed Worker claim.
+func (t *Task) NotifyWorker() {
+	if t == nil || t.workerWake == nil {
+		return
+	}
+	select {
+	case t.workerWake <- struct{}{}:
+	default:
+	}
+}
+
+// NotifyWorkerMessage immediately schedules a Planner round for an accepted,
+// persistent Worker direction. ActivityID identifies the durable kind=user row
+// and prevents retries in the same debounce window from duplicating the prompt.
+func (t *Task) NotifyWorkerMessage(intentID, activityID int64, message string) {
+	message = strings.TrimSpace(message)
+	if intentID <= 0 || activityID <= 0 || message == "" {
+		return
+	}
+	t.trigMu.Lock()
+	for _, event := range t.pendingTriggers {
+		if event.Kind == agent.TriggerWorkerMessage && event.ActivityID == activityID {
+			t.trigMu.Unlock()
+			return
+		}
+	}
+	t.pendingTriggers = append(t.pendingTriggers, agent.TriggerEvent{
+		Kind: agent.TriggerWorkerMessage, ActivityID: activityID, IntentID: intentID, Detail: message,
+	})
+	t.trigMu.Unlock()
+	t.Notify()
+}
+
 // NotifyDone is Notify plus a hint: a worker just finished intentID and that is
 // what triggered this wake-up. The planner reads the accumulated triggers next
 // round so it can spell out which intent finished (+ its output). Events pile up

server/server.go

@@ -249,6 +249,9 @@ func New(ctx context.Context, m *Manager, skillDir string, dataDir string, keyDi
 		if n, _ := t.Store.ResetRunningIntents(); n > 0 {
 			log.Printf("[engine] task %s 重置 %d 个残留 running 意图为 open", t.ID, n)
 		}
+		if err := s.engine.RecoverWorkerMessages(ctx, t); err != nil {
+			log.Printf("[worker chat] task %s 恢复待处理人工消息失败: %v", t.ID, err)
+		}
 		if lifecycle.Paused {
 			s.engine.Pause(t.ID, agent.AbortPausedOnReload)
 		}
@@ -471,6 +474,11 @@ func (s *Server) applyLLM(cfg agent.Config) error {
 	s.llmOn = true
 	s.cfgMu.Unlock()
 	s.invalidateTaskAgents()
+	for _, task := range s.m.List() {
+		if err := s.engine.RecoverWorkerMessages(s.ctx, task); err != nil {
+			log.Printf("[worker chat] task %s 在 LLM 就绪后恢复待处理人工消息失败: %v", task.ID, err)
+		}
+	}
 
 	// wake the active task so a task created while idle starts exploring.
 	if t := s.m.ActiveTask(); t != nil {
@@ -749,6 +757,7 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("PUT /api/tasks/{id}/llm", s.updateTaskLLMProfiles)
 	mux.HandleFunc("GET /api/tasks/{id}/llm/resolution", s.taskLLMResolutionHandler)
 	mux.HandleFunc("POST /api/tasks/{id}/intents/{iid}/control", s.controlIntent)
+	mux.HandleFunc("POST /api/tasks/{id}/intents/{iid}/messages", s.sendWorkerMessage)
 	mux.HandleFunc("POST /api/tasks/{id}/intents/{iid}/rerun", s.rerunIntent)    // 重跑单条 blocked/exhausted/stopped 意图
 	mux.HandleFunc("POST /api/tasks/{id}/intents/rerun-blocked", s.rerunBlocked) // 批量重跑本任务全部 blocked 意图
 	mux.HandleFunc("POST /api/active", s.setActive)

web/src/app/(main)/function/tasks/detail/_tabs/sessions-tab.tsx

@@ -14,7 +14,6 @@ import {
   Loader2Icon,
   PaperclipIcon,
   PauseIcon,
-  PlayIcon,
   RadioIcon,
   RotateCwIcon,
   ShieldAlertIcon,
@@ -43,6 +42,7 @@ import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupTextarea } from "@/components/ui/input-group";
 import { ScrollArea } from "@/components/ui/scroll-area";
+import { Spinner } from "@/components/ui/spinner";
 import { Textarea } from "@/components/ui/textarea";
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
 import { api, sseUrl } from "@/lib/api";
@@ -93,6 +93,18 @@ const PAGE = 200; // history page size
 const SYSTEM_SCAN_PAGE = 500; // generic activity pages scanned to recover sparse system audit events
 const MAX_KEEP = 4000; // per-session in-memory cap; older pages re-fetched on scroll-up
 const STREAM_WINDOW_MS = 5000; // "live" = activity seen within this window
+const MAX_WORKER_MESSAGE_CHARS = 4000;
+
+function newWorkerMessageRequestID(): string {
+  return (
+    globalThis.crypto?.randomUUID?.() ??
+    `worker-message-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 12)}`
+  );
+}
+
+function workerMessageCharCount(value: string): number {
+  return Array.from(value).length;
+}
 
 // One session's lazily-loaded, reverse-paginated cache. `lastTs`/`unread` are kept
 // live even for sessions that were never opened, so the list shows liveness + unread
@@ -313,8 +325,6 @@ function SessionItem({
   hasPending,
   unread,
   onClick,
-  onPause,
-  onResume,
   onCancel,
   controlling,
   deleted,
@@ -325,8 +335,6 @@ function SessionItem({
   hasPending?: boolean;
   unread?: number;
   onClick: () => void;
-  onPause?: () => void;
-  onResume?: () => void;
   onCancel?: () => void;
   controlling?: boolean;
   deleted?: boolean;
@@ -339,7 +347,8 @@ function SessionItem({
     <Loader2Icon className="size-3.5 animate-spin text-blue-500" />
   ) : null;
 
-  const controllable = s.role === "worker" && !s.inherited && (s.status === "running" || s.status === "paused");
+  const cancellable =
+    s.role === "worker" && !s.inherited && !deleted && (s.status === "running" || s.status === "paused");
   return (
     <div
       className={cn(
@@ -386,33 +395,8 @@ function SessionItem({
           </span>
         )}
       </button>
-      {controllable && (
+      {cancellable && (
         <div className="flex shrink-0 items-center gap-0.5 pr-1 opacity-100 sm:opacity-0 sm:transition-opacity sm:group-hover/session:opacity-100 sm:group-focus-within/session:opacity-100">
-          {s.status === "running" ? (
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon-xs"
-              onClick={onPause}
-              disabled={controlling}
-              title="暂停 Worker"
-              aria-label="暂停 Worker"
-            >
-              {controlling ? <Loader2Icon className="animate-spin" /> : <PauseIcon />}
-            </Button>
-          ) : (
-            <Button
-              type="button"
-              variant="ghost"
-              size="icon-xs"
-              onClick={onResume}
-              disabled={controlling}
-              title="恢复 Worker"
-              aria-label="恢复 Worker"
-            >
-              {controlling ? <Loader2Icon className="animate-spin" /> : <PlayIcon />}
-            </Button>
-          )}
           <Button
             type="button"
             variant="ghost"
@@ -495,6 +479,9 @@ export function SessionsTab({ taskId }: { taskId: string }) {
   const [controllingIntent, setControllingIntent] = React.useState<string | null>(null);
   const [cancelIntent, setCancelIntent] = React.useState<Session | null>(null);
   const [cancelReason, setCancelReason] = React.useState("");
+  const [workerMessage, setWorkerMessage] = React.useState("");
+  const [workerMessageRequestId, setWorkerMessageRequestId] = React.useState("");
+  const [workerMessageSending, setWorkerMessageSending] = React.useState(false);
   // 方式1 文件上传:选好的附件(已落到任务工作目录 uploads/),随下条消息一起发。
   const [attachments, setAttachments] = React.useState<ChatAttachment[]>([]);
   const [uploading, setUploading] = React.useState(false);
@@ -554,6 +541,7 @@ export function SessionsTab({ taskId }: { taskId: string }) {
     },
     [controllingIntent, patchIntentState, taskId],
   );
+
   // SSE connection state — surfaced so a dropped realtime link is visible, never
   // silently shown as "no messages".
   const [sseLive, setSseLive] = React.useState(false);
@@ -1345,6 +1333,55 @@ export function SessionsTab({ taskId }: { taskId: string }) {
       .finally(() => setSending(false));
   }
 
+  function sendWorkerChat() {
+    const intentId = active.intent_id;
+    const message = workerMessage.trim();
+    if (
+      !intentId ||
+      active.inherited ||
+      (active.status !== "paused" && active.status !== "pending") ||
+      workerMessageSending ||
+      !message
+    )
+      return;
+    if (workerMessageCharCount(message) > MAX_WORKER_MESSAGE_CHARS) {
+      toast.error(`消息不能超过 ${MAX_WORKER_MESSAGE_CHARS} 个字符`);
+      return;
+    }
+    const requestId = workerMessageRequestId || newWorkerMessageRequestID();
+    if (!workerMessageRequestId) setWorkerMessageRequestId(requestId);
+    setWorkerMessageSending(true);
+    api
+      .sendWorkerMessage(taskId, intentId, message, requestId)
+      .then((result) => {
+        const sentAt = new Date().toISOString();
+        const activity: Activity = {
+          seq: result.activity_seq,
+          intent_id: intentId,
+          worker: "user",
+          ts: sentAt,
+          kind: "user",
+          summary: message,
+          detail: message,
+        };
+        patchStore(`intent:${intentId}`, (state) => ({
+          ...state,
+          items: mergeBySeq(state.items, [activity]),
+          lastTs: sentAt,
+          loaded: true,
+          unread: 0,
+        }));
+        patchIntentState(intentId, result.state);
+        setWorkerMessage("");
+        setWorkerMessageRequestId("");
+        toast.success(`消息已发送给 Worker #${intentId}，已立即继续执行`);
+      })
+      .catch((error) => {
+        toast.error(`发送失败：${(error as Error).message || "请稍后重试"}`);
+      })
+      .finally(() => setWorkerMessageSending(false));
+  }
+
   const mainLoaded = !!store.main?.loaded;
   // 发送键位由系统设置决定（localStorage），默认 Enter 发送。
   const sendMode = useChatSendMode();
@@ -1475,11 +1512,11 @@ export function SessionsTab({ taskId }: { taskId: string }) {
                           onClick={() => {
                             setActiveId(s.id);
                             setListOpen(false); // 手机端选完即收起，把高度还给会话记录
+                            setWorkerMessage("");
+                            setWorkerMessageRequestId("");
                           }}
                           controlling={controllingIntent === s.intent_id}
                           deleted={meta?.deleted}
-                          onPause={() => void controlWorker(s, "pause")}
-                          onResume={() => void controlWorker(s, "resume")}
                           onCancel={() => {
                             setCancelIntent(s);
                           }}
@@ -1749,6 +1786,74 @@ export function SessionsTab({ taskId }: { taskId: string }) {
                 </InputGroupAddon>
               </InputGroup>
             </div>
+          ) : active.role === "worker" &&
+            !active.inherited &&
+            (active.status === "running" || active.status === "paused" || active.status === "pending") ? (
+            <div className="border-t p-3">
+              <InputGroup className="min-h-9 has-disabled:opacity-100">
+                <InputGroupTextarea
+                  rows={1}
+                  aria-label={`给 Worker #${active.intent_id} 发消息`}
+                  placeholder={`给 Worker #${active.intent_id} 发消息，调整执行方向…`}
+                  value={workerMessage}
+                  onChange={(event) => {
+                    setWorkerMessage(event.target.value);
+                    setWorkerMessageRequestId("");
+                  }}
+                  onKeyDown={(event) => {
+                    if (!shouldSubmitOnKey(event, sendMode)) return;
+                    event.preventDefault();
+                    sendWorkerChat();
+                  }}
+                  disabled={active.status === "running" || workerMessageSending}
+                  aria-invalid={workerMessageCharCount(workerMessage) > MAX_WORKER_MESSAGE_CHARS}
+                  className="max-h-36 min-h-9 overflow-y-auto"
+                />
+                <InputGroupAddon align="block-end">
+                  <span
+                    className={cn(
+                      "px-1 text-[10px] tabular-nums text-muted-foreground",
+                      workerMessageCharCount(workerMessage) > MAX_WORKER_MESSAGE_CHARS && "text-destructive",
+                    )}
+                  >
+                    {workerMessageCharCount(workerMessage)}/{MAX_WORKER_MESSAGE_CHARS}
+                  </span>
+                  {active.status === "running" ? (
+                    <InputGroupButton
+                      className="ml-auto"
+                      size="icon-xs"
+                      variant="destructive"
+                      onClick={() => void controlWorker(active, "pause")}
+                      disabled={controllingIntent === active.intent_id}
+                      title="暂停当前 Worker"
+                      aria-label="暂停当前 Worker"
+                    >
+                      {controllingIntent === active.intent_id ? (
+                        <Loader2Icon className="animate-spin" />
+                      ) : (
+                        <SquareIcon />
+                      )}
+                    </InputGroupButton>
+                  ) : (
+                    <InputGroupButton
+                      className="ml-auto"
+                      size="icon-xs"
+                      variant="default"
+                      onClick={sendWorkerChat}
+                      disabled={
+                        workerMessageSending ||
+                        !workerMessage.trim() ||
+                        workerMessageCharCount(workerMessage) > MAX_WORKER_MESSAGE_CHARS
+                      }
+                      title="发送消息"
+                      aria-label="发送消息"
+                    >
+                      {workerMessageSending ? <Spinner /> : <ArrowUpIcon />}
+                    </InputGroupButton>
+                  )}
+                </InputGroupAddon>
+              </InputGroup>
+            </div>
           ) : (
             <div className="flex items-center border-t px-4 py-2">
               <TodoPopover

web/src/lib/api.ts

@@ -284,6 +284,14 @@ export const api = {
       state: "paused" | "open" | "stopped";
       deleted?: { intents: number; facts: number; findings: number; activities: number };
     }>(`/tasks/${taskId}/intents/${intentId}/control`, { action, reason: reason ?? "" }),
+  sendWorkerMessage: (taskId: string, intentId: string, message: string, requestId: string) =>
+    post<{
+      id: number;
+      state: "open" | "running" | "paused";
+      accepted: true;
+      activity_seq: number;
+      request_id: string;
+    }>(`/tasks/${taskId}/intents/${intentId}/messages`, { message, request_id: requestId }),
   taskLLMResolution: (id: string) => get<TaskLLMResolutions>(`/tasks/${id}/llm/resolution`),
   // 重跑一条没跑成功的意图(blocked/exhausted/stopped)：置回 open，worker 会重新认领、从头再跑。
   rerunIntent: (taskId: string, intentId: string) =>

web/src/lib/mock/handler.ts

@@ -10,6 +10,7 @@ import {
   normalizeCompanyScopeValue,
 } from "../company-scope";
 import type {
+  Activity,
   ArchiveBatchItem,
   Asset,
   BatchControlItem,
@@ -42,6 +43,7 @@ const mockConversations = structuredClone(D.conversations);
 const mockIntents = structuredClone(D.intents);
 const mockCompanies = structuredClone(D.companies);
 const mockAssets = structuredClone(D.assets);
+const mockActivity = structuredClone(D.activity);
 type MockTaskArchiveSnapshot = {
   task: Task;
   numericTaskID: number;
@@ -420,6 +422,15 @@ function bodyIDs(value: unknown): string[] {
 }
 
 type MockIntentControlResult = { ok: boolean; state?: string; error?: string };
+type MockWorkerMessage = {
+  intentId: string;
+  message: string;
+  state: "open" | "running";
+  activitySeq: number;
+};
+
+const mockWorkerMessages = new Map<string, MockWorkerMessage>();
+let nextMockWorkerMessageActivitySeq = mockActivity.reduce((maximum, item) => Math.max(maximum, item.seq), 0) + 1;
 
 function controlMockIntent(id: string, action: "pause" | "resume"): MockIntentControlResult {
   const intent = mockIntents.find((item) => item.id === id);
@@ -432,6 +443,71 @@ function controlMockIntent(id: string, action: "pause" | "resume"): MockIntentCo
   return { ok: true, state: intent.state };
 }
 
+function sendMockWorkerMessage(
+  id: string,
+  message: string,
+  requestId: string,
+): MockIntentControlResult & { activitySeq?: number; requestId?: string } {
+  const normalizedMessage = message.trim();
+  const normalizedRequestId = requestId.trim();
+  if (!normalizedRequestId) return { ok: false, error: "request_id 不能为空" };
+  const previous = mockWorkerMessages.get(normalizedRequestId);
+  if (previous) {
+    if (previous.intentId !== id || previous.message !== normalizedMessage) {
+      return { ok: false, error: "request_id 已用于其他 Worker 消息" };
+    }
+    return {
+      ok: true,
+      state: previous.state,
+      activitySeq: previous.activitySeq,
+      requestId: normalizedRequestId,
+    };
+  }
+  const intent = mockIntents.find((item) => item.id === id);
+  if (!intent) return { ok: false, error: "意图不存在" };
+  if (intent.inherited || (intent.state !== "running" && intent.state !== "paused")) {
+    return { ok: false, state: intent.state, error: "Worker 状态已变化" };
+  }
+  if (!normalizedMessage) return { ok: false, state: intent.state, error: "消息不能为空" };
+  if (Array.from(normalizedMessage).length > 4000) {
+    return { ok: false, state: intent.state, error: "消息不能超过 4000 个字符" };
+  }
+
+  // The real endpoint stops the active turn, persists a normal user message,
+  // and immediately reopens the same intent. Keep the mock's transition in sync,
+  // then emulate a Worker reclaiming it shortly afterward.
+  intent.state = "open";
+  const activitySeq = nextMockWorkerMessageActivitySeq++;
+  const workerMessage: MockWorkerMessage = {
+    intentId: id,
+    message: normalizedMessage,
+    state: "open",
+    activitySeq,
+  };
+  mockWorkerMessages.set(normalizedRequestId, workerMessage);
+  mockActivity.push({
+    seq: activitySeq,
+    intent_id: id,
+    worker: "user",
+    ts: new Date().toISOString(),
+    kind: "user",
+    summary: normalizedMessage,
+    detail: normalizedMessage,
+  } satisfies Activity);
+  setTimeout(() => {
+    if (intent.state === "open") {
+      intent.state = "running";
+      workerMessage.state = "running";
+    }
+  }, 250);
+  return {
+    ok: true,
+    state: workerMessage.state,
+    activitySeq: workerMessage.activitySeq,
+    requestId: normalizedRequestId,
+  };
+}
+
 function controlMockTask(id: string, action: "pause" | "resume"): BatchControlItem {
   const task = mockTasks.find((item) => item.id === id);
   if (!task) return { id, ok: false, error: "任务不存在" };
@@ -917,7 +993,7 @@ function route(m: string, path: string, seg: string[], q: URLSearchParams, b: Re
           intents: 1,
           facts: 1,
           findings: 1,
-          activities: D.activity.filter((item) => item.intent_id === id).length,
+          activities: mockActivity.filter((item) => item.intent_id === id).length,
         },
       };
     }
@@ -926,6 +1002,18 @@ function route(m: string, path: string, seg: string[], q: URLSearchParams, b: Re
     if (!result.ok) throw new Error(result.error ?? "Worker 状态已变化");
     return { id: Number(id.replace(/\D/g, "")) || 0, state: result.state };
   }
+  if (seg[0] === "tasks" && seg[2] === "intents" && seg[4] === "messages" && m === "POST") {
+    const id = seg[3];
+    const result = sendMockWorkerMessage(id, String(b.message ?? ""), String(b.request_id ?? ""));
+    if (!result.ok) throw new Error(result.error ?? "Worker 状态已变化");
+    return {
+      id: Number(id.replace(/\D/g, "")) || 0,
+      state: result.state ?? "open",
+      accepted: true,
+      activity_seq: result.activitySeq ?? 0,
+      request_id: result.requestId ?? "",
+    };
+  }
   if (seg[0] === "tasks" && seg.length === 3 && seg[2] === "control" && m === "POST") {
     const action = b.action === "resume" ? "resume" : "pause";
     const result = controlMockTask(seg[1], action);
@@ -1464,13 +1552,11 @@ function route(m: string, path: string, seg: string[], q: URLSearchParams, b: Re
   if (path === "/exploration/activity" && seg.length === 2) {
     const since = Number(q.get("since") ?? 0);
     const limit = Math.max(1, Number(q.get("limit") ?? 300));
-    const items = D.activityForTask()
-      .filter((item) => item.seq > since)
-      .slice(0, limit);
+    const items = mockActivity.filter((item) => item.seq > since).slice(0, limit);
     return { items, cursor: items.length ? items[items.length - 1].seq : since };
   }
   if (seg[0] === "exploration" && seg[1] === "activity" && seg.length === 3) {
-    const a = D.activity.find((x) => x.seq === Number(seg[2]));
+    const a = mockActivity.find((x) => x.seq === Number(seg[2]));
     return { detail: a?.detail ?? a?.summary ?? "" };
   }
   if (path === "/tokens/daily") return D.dailyTokens;