/120-error-handling
- If any phase fails catastrophically (agent error, required file missing after agent run), **STOP** immediately and report: what phase failed, what file is missing, and what the user should do next. - Mechanic check failures continue to audit — they influence the decision but
$ npx -y skills add heurema/signum --agent claude-codeHow it fires
How this command gets triggered: by you, by Claude, or both.
- Fires itselfClaude auto-loads it when your prompt matches the work.
- You can call itInvoke it directly when you want it.
- Slash command
/120-error-handling
Context preview
What this command does when you run it.
- If any phase fails catastrophically (agent error, required file missing after agent run), **STOP** immediately and report: what phase failed, what file is missing, and what the user should do next. - Mechanic check failures continue to audit — they influence the decision but
Command definition
120-error-handling.mdError Handling
- If any phase fails catastrophically (agent error, required file missing after agent run), **STOP** immediately and report: what phase failed, what file is missing, and what the user should do next.
- Mechanic check failures continue to audit — they influence the decision but do not block Phase 3.
- If codex or gemini times out (`exit 124`) or returns a non-zero exit code, mark as unavailable and continue.
- **Never silently swallow errors.** All bash exit codes must be checked. If jq fails to parse a file, report it explicitly.
- If the synthesizer produces an invalid audit_summary.json, stop Phase 4 and report the problem.
Signum is a contract-first proof gate for agentic software changes: it turns a task into a reviewed contract, executes against that contract, audits the result, and packages evidence that humans and CI can inspect.
Other commands on signum.
- /apply
Implement tasks from an OpenSpec change (Experimental)
Open command - /archive
Archive a completed change in the experimental workflow
Open command - /explore
Enter explore mode - think through ideas, investigate problems, clarify requirements
Open command - /propose
Propose a new change - create it and generate all artifacts in one step
Open command - /sync
Sync delta specs from a change to main specs
Open command - /update
Update a change - revise existing planning artifacts and keep them coherent (Experimental)
Open command