diff --git a/db/db.go b/db/db.go
index 6a9e085..6a35129 100644
--- a/db/db.go
+++ b/db/db.go
@@ -103,7 +103,7 @@ type builtinAgent struct {
 	key, name, role, desc string
 	vars                  []promptVar
 	interactiveShell      bool // 建行时的默认交互式 shell 开关；ON CONFLICT 不覆盖用户后续手动开关
-	runSeconds            *int // 建行时的单次 run 墙钟上限(秒)；nil=用表默认(600)，0=不限时
+	runSeconds            *int // 建行时的单次 run 墙钟上限(秒)；nil=用种子默认(1200)，0=不限时
 }
 
 type promptVar struct{ name, desc, example, source string }
@@ -144,7 +144,7 @@ func (d *DB) seedBuiltins() error {
 		var agentID int64
 		err := d.QueryRow(`
 INSERT INTO agents(key, name, description, role, builtin, enabled, interactive_shell, run_seconds)
-VALUES ($1, $2, NULLIF($3,''), $4, true, true, $5, COALESCE($6, 600))
+VALUES ($1, $2, NULLIF($3,''), $4, true, true, $5, COALESCE($6, 1200))
 ON CONFLICT (key) DO UPDATE SET name = EXCLUDED.name, description = EXCLUDED.description
 RETURNING id`, a.key, a.name, a.desc, a.role, a.interactiveShell, a.runSeconds).Scan(&agentID)
 		if err != nil {
diff --git a/db/schema.sql b/db/schema.sql
index 8f1886a..fd55259 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -414,7 +414,7 @@ CREATE TABLE IF NOT EXISTS agents (
     llm_profile_id    BIGINT REFERENCES llm_profiles(id) ON DELETE SET NULL,
     current_prompt_id BIGINT,
     max_turns         INTEGER NOT NULL DEFAULT 0,
-    run_seconds       INTEGER NOT NULL DEFAULT 600,
+    run_seconds       INTEGER NOT NULL DEFAULT 1200,
     web_search        BOOLEAN NOT NULL DEFAULT false,
     interactive_shell BOOLEAN NOT NULL DEFAULT false,
     wrapup_prompt     TEXT NOT NULL DEFAULT '',
@@ -434,6 +434,8 @@ ALTER TABLE agents ADD COLUMN IF NOT EXISTS trigger_merge_mode   TEXT    NOT NUL
 ALTER TABLE agents ADD COLUMN IF NOT EXISTS trigger_max_parallel INTEGER NOT NULL DEFAULT 5;
 -- per-agent LLM 绑定(agent 级默认模型):列自初版即在上方 CREATE 中,此 ALTER 仅为极旧库兜底(幂等)。
 ALTER TABLE agents ADD COLUMN IF NOT EXISTS llm_profile_id BIGINT REFERENCES llm_profiles(id) ON DELETE SET NULL;
+-- run_seconds 单次 run 墙钟默认 600→1200:只改列默认(影响将来新插入的行),不动旧库存量行。
+ALTER TABLE agents ALTER COLUMN run_seconds SET DEFAULT 1200;
 CREATE INDEX IF NOT EXISTS idx_agents_llm_profile ON agents(llm_profile_id) WHERE llm_profile_id IS NOT NULL;
 DROP TRIGGER IF EXISTS trg_agents_upd ON agents;
 CREATE TRIGGER trg_agents_upd BEFORE UPDATE ON agents
diff --git a/server/server.go b/server/server.go
index c7f1d40..0b82c82 100644
--- a/server/server.go
+++ b/server/server.go
@@ -275,14 +275,14 @@ func (s *Server) agentMaxTurns(key string) int {
 }
 
 // agentRunSeconds returns the configured wall-clock run budget (seconds) for an
-// agent key (0 = unlimited; 600 fallback when no DB or no row, matching schema).
+// agent key (0 = unlimited; 1200 fallback when no DB or no row, matching schema).
 func (s *Server) agentRunSeconds(key string) int {
 	if s.m.pg == nil {
-		return 600
+		return 1200
 	}
 	a, err := s.m.pg.GetAgentByKey(key)
 	if err != nil || a == nil {
-		return 600
+		return 1200
 	}
 	return a.RunSecs
 }