Debug and Fix

Find the root cause of a failure, then — when the user chooses to — fix it with test-first discipline.

Done when: the causal chain from trigger to symptom is stated with no gaps and file:line evidence, and either a verified fix has been handed off (PR, commit, or the user's chosen stop) or a diagnosis-only summary has been delivered. Escalate rather than persist: 2-3 hypotheses exhausted without confirmation, or 3 failed fix attempts, means diagnose why (Smart escalation) instead of trying again.

The bug description is the input this skill was invoked with — the failure to diagnose, present in the current prompt or conversation, whether the user provided it directly or a calling skill passed it (e.g. ce-babysit-pr / lfg in mode:pipeline, which pass the failing jobs and log tails as the argument). It may be a description of the failure, a mode: token, or an issue reference (#123, org/repo#123, or an issue URL). The rest of this skill refers to it as <bug_description>; if nothing was provided, treat <bug_description> as blank.

Setup

Run this once at the start of this invocation, before any subagent dispatch, and follow the directives it prints — except where one conflicts with this skill's own rules on asking the user questions, whether those rules are scoped to a non-interactive mode or apply in every mode, in which case this skill's rules win and no blocking question is asked. Run the fence exactly as written, as its own command: do not pipe or filter it (no head, tail, or grep), do not truncate its output, and do not bundle it into a batch with other commands. Its output opens with a === skill context header and ends with CE_CONTEXT_END; if you received one of those lines without the other, the output was truncated — rerun the fence verbatim once. That recovery is the only rerun: otherwise do not rerun it within the same invocation; a later invocation of this or any other skill runs its own. If no Node runtime is available the skill proceeds unchanged.