Async subagent resume on missing artifact

Skill kjuhwa/skills-hub/skills/workflow/async-subagent-resume-on-missing-artifact

Self-correcting knowledge corpus for Claude Code — 9 stable shape clusters, bias-correction pipeline baked into contribution flow. 47 papers, 45 techniques, 1.1k skills.

Install

npx -y skills add kjuhwa/skills-hub --skill async-subagent-resume-on-missing-artifact

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When an async subagent is reported "completed" but its final message hints at unfinished work (e.g., "Now let me build…"), verify the expected on-disk artifact before moving on; if missing, use SendMessage to the agent id to finalize rather than re-dispatching a fresh agent.

SKILL.md

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Resume an async subagent instead of re-dispatching

Async subagents can be marked "completed" even when their final user-facing message is a mid-thought like "I have all the data needed. Now let me build…". Their in-memory plan may have not resulted in an actual file write. Re-dispatching a brand new agent loses all the setup context.

Protocol

Always verify artifact on disk after an async agent reports completion and you expect a file:
```
ls -la docs/expected-artifact.json
```
If missing and the result message looks truncated / mid-action:
- Do NOT spawn a fresh agent.
- Call SendMessage to the agent's id with a pointed follow-up:
```
SendMessage({
  to: "<agentId>",
  message: "The file `docs/x.json` was not actually written. Please use the Write tool to save the complete output you built. Report back with the final summary."
})
```
- The runtime will resume the agent from its transcript — all prior analysis is preserved.
Wait for the completion notification; verify artifact appears on disk.

When to give up and re-dispatch