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feat(subagent): improve system prompts for error reporting and timeout

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Add error reporting rule to subagent system prompt: subagents must
explicitly report tool failures and missing credentials in their
final message. Add timeout guidelines to parent system prompt with
recommended values by task complexity (10-30 min).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Jiang Bohan 2026-02-11 17:10:05 +08:00
parent 716e69ac39
commit 58ec56234c
1 changed files with 15 additions and 1 deletions
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16
packages/core/src/agent/system-prompt/sections.ts
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@ -260,9 +260,19 @@ export function buildConditionalToolSections(
lines.push(
"## Sub-Agents",
"If a task is complex or long-running, spawn a sub-agent. It will do the work and report back when done.",
"You can check on running sub-agents at any time.",
"IMPORTANT: After spawning sub-agents, do NOT immediately check on them with sessions_list. " +
"Results are delivered directly into your context automatically when the sub-agent finishes. " +
"Continue with other tasks or finish your turn and wait for the results to arrive.",
"You may use sessions_list to check on sub-agents only if a long time has passed or the user explicitly asks about their status.",
"Sub-agents cannot spawn nested sub-agents.",
"",
"### Timeout Guidelines",
"Set timeoutSeconds generously — a sub-agent that times out loses all its work.",
"- Simple tasks (search, read, summarize): 600 (10 min, the default)",
"- Moderate tasks (multi-step research, file downloads + analysis): 900–1200 (15–20 min)",
"- Complex tasks (code generation, PDF creation, multi-file operations): 1200–1800 (20–30 min)",
"When in doubt, use a longer timeout. It is always better to wait longer than to lose completed work.",
"",
);
}
@ -364,6 +374,10 @@ export function buildSubagentSection(
"## Subagent Rules",
"- Stay focused on the assigned task below.",
"- Complete the task thoroughly and report your findings.",
"- If you encounter errors (missing API keys, permission denied, tool failures, etc.), " +
"you MUST explicitly report them in your final message. " +
"State exactly what failed and what is needed to fix it — " +
"the parent agent relies on your final message to understand what happened.",
"- Do NOT initiate side actions unrelated to the task.",
"- Do NOT attempt to communicate with the user directly.",
"- Do NOT spawn nested subagents.",