diff --git a/agent/blackboard_inheritance_test.go b/agent/blackboard_inheritance_test.go
index 4549ff5..9f55359 100644
--- a/agent/blackboard_inheritance_test.go
+++ b/agent/blackboard_inheritance_test.go
@@ -103,9 +103,8 @@ func TestGraphOverviewExpandsAssociatedCompanyScope(t *testing.T) {
 	if !ok || len(keywords) != 1 || keywords[0] != keyword {
 		t.Fatalf("company keywords missing: %#v", scopeRows[0]["company_keywords"])
 	}
-	hosts, ok := coverage["hosts"].([]string)
-	if !ok || !containsString(hosts, domain) {
-		t.Fatalf("company asset host missing from agent context: %#v", coverage["hosts"])
+	if hc, _ := coverage["host_count"].(int); hc < 1 {
+		t.Fatalf("company asset host not counted in agent context: %#v", coverage["host_count"])
 	}
 	untested := callReadJSON(t, tools.listUntestedAssets(), `{"type":"root_domain","page":1,"page_size":10}`)
 	if !strings.Contains(fmt.Sprint(untested), domain) {
@@ -153,9 +152,8 @@ func TestGraphOverviewExpandsAssociatedCompanyScope(t *testing.T) {
 	if !ok {
 		t.Fatalf("coverage-disabled task lost asset context: %#v", disabledOverview["coverage"])
 	}
-	disabledHosts, ok := disabledCoverage["hosts"].([]string)
-	if !ok || !containsString(disabledHosts, domain) {
-		t.Fatalf("coverage-disabled task lost company asset host: %#v", disabledCoverage["hosts"])
+	if hc, _ := disabledCoverage["host_count"].(int); hc < 1 {
+		t.Fatalf("coverage-disabled task lost company asset host count: %#v", disabledCoverage["host_count"])
 	}
 	if _, exists := disabledCoverage["denominator"]; exists {
 		t.Fatalf("coverage-disabled task unexpectedly exposed metrics: %#v", disabledCoverage)
@@ -176,15 +174,6 @@ func TestGraphOverviewExpandsAssociatedCompanyScope(t *testing.T) {
 	}
 }
 
-func containsString(items []string, target string) bool {
-	for _, item := range items {
-		if item == target {
-			return true
-		}
-	}
-	return false
-}
-
 func companiesName(t *testing.T, companies *db.CompanyStore, companyID int64) string {
 	t.Helper()
 	company, err := companies.GetCompany(companyID)
@@ -321,9 +310,8 @@ func TestBlackboardToolsReadDirectSources(t *testing.T) {
 	if !ok {
 		t.Fatalf("coverage missing from overview: %#v", overview["coverage"])
 	}
-	hosts, ok := coverage["hosts"].([]string)
-	if !ok || len(hosts) != 1 || hosts[0] != host || coverage["host_count"] != 1 {
-		t.Fatalf("inherited host context missing: %#v", coverage)
+	if coverage["host_count"] != 1 {
+		t.Fatalf("inherited host context missing (want host_count=1): %#v", coverage)
 	}
 
 	facts := callReadJSON(t, tools.listFacts(), `{}`).(map[string]any)["facts"].([]any)
diff --git a/agent/tools.go b/agent/tools.go
index c6894aa..2f1f0e5 100644
--- a/agent/tools.go
+++ b/agent/tools.go
@@ -412,6 +412,12 @@ func (t *ToolSet) graphOverviewData() map[string]any {
 	}
 	out["running_intents"] = compactIntents(running, parentsOf, yieldsOf)
 	out["recent_done_intents"] = compactIntents(recentDone, parentsOf, yieldsOf)
+	// done_intents_total：已结束意图（done/blocked/exhausted）总数，与 recent_done_intents
+	// 平行命名——后者只是它的最新窗口（≤15）截断视图。两键并排即自描述："看到的是 N/总数"，
+	// 让 planner 去重时别把"没显示"当成"没派过"，无需在提示词里另行解释。
+	if dt, err := t.ts.CountFinishedIntents(); err == nil {
+		out["done_intents_total"] = dt
+	}
 	out["frontier_open"] = len(fr)
 	// findings (confirmed vulns) and facts (worker exploration results) are
 	// now distinct node kinds. recent_facts surfaces fact summaries (esp.
@@ -532,16 +538,9 @@ func (t *ToolSet) graphOverviewData() map[string]any {
 				m["scope"] = scope
 			}
 			if hosts, err := t.as.HostsByTaskWithSources(t.taskID); err == nil {
-				const hostContextLimit = 500
-				visible := hosts
-				if len(visible) > hostContextLimit {
-					visible = visible[:hostContextLimit]
-				}
-				m["hosts"] = visible
+				// 只给主机总数，不再把 host 列表平铺进 graph_overview（大范围任务里那是每轮
+				// 都重复携带的大量字符串，对规划决策价值有限）；具体主机按需 list_assets 查。
 				m["host_count"] = len(hosts)
-				if len(visible) < len(hosts) {
-					m["hosts_truncated"] = true
-				}
 			}
 			if len(m) > 0 {
 				out["coverage"] = m
diff --git a/db/exploration.go b/db/exploration.go
index eb0e677..a4260c2 100644
--- a/db/exploration.go
+++ b/db/exploration.go
@@ -706,6 +706,18 @@ func (s *ExplorationStore) countByKindFiltered(kind, q string) (int, error) {
 	return n, err
 }
 
+// CountFinishedIntents counts this exploration's intents in a terminal explored
+// state (done/blocked/exhausted) — graph_overview's done_intents_total, so the planner
+// knows recent_done_intents (capped at a recent window) is a truncated view and
+// stays cautious about "already tried" dedup. Excludes 'stopped' (killed/deleted),
+// matching exactly what recent_done_intents surfaces.
+func (s *ExplorationStore) CountFinishedIntents() (int, error) {
+	var n int
+	err := s.db.QueryRow(`SELECT COUNT(*) FROM exploration_nodes
+WHERE exploration_id=$1 AND kind='intent' AND state IN ('done','blocked','exhausted')`, s.expID).Scan(&n)
+	return n, err
+}
+
 // GetNode returns one node of this exploration by id (nil, nil if not found).
 func (s *ExplorationStore) GetNode(id int64) (*Node, error) {
 	n, err := scanNode(s.db.QueryRow(`SELECT `+nodeCols+` FROM exploration_nodes WHERE id=$1 AND exploration_id=$2`, id, s.expID))