Subagent Pre-Flight Check

Paste your Claude Code subagent definition and (optionally) your .mcp.json. The tool runs a static analysis against 36 documented failure modes from a seven-day systematic survey of the anthropics/claude-code issue tracker (2026-05-09 → 2026-05-16). Detection is fully client-side; nothing is sent anywhere.

1. Paste the YAML frontmatter from your .claude/agents/<name>.md (required)

2. Paste your .mcp.json (optional, project-scoped)

3. How are you dispatching this subagent?

Foreground (in main session) Background (run_in_background: true) Cowork (separate session)

4. Platform (optional, narrows OS-specific findings)

Any macOS Windows Linux

Source: 36-case systematic survey 2026-05-09 → 2026-05-16, anthropics/claude-code issue tracker. All cited issues are public; click through to verify.

No data leaves your browser. Static analysis only. Tool published 2026-05-16.

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