Stack-Trace Investigator (Meta-Skill)

A combinator-style meta-skill that converts a pasted stack trace into a structured root-cause report. It now classifies Python, JavaScript, TypeScript, Go, Rust, or unknown traces before running the investigation. After parsing the trace once, heterogeneous investigations run in parallel:

1. grep_repo — ripgrep for the symbols in the current repo
2. search_issues — gh issue list for similar reported problems
3. git_history — recent commits touching the affected files
4. diff_context — git-diff skill for current worktree context
5. history_patterns — history-explorer skill for prior skill/router usage patterns
6. memory_recall — prior incidents stored under the traceback topic
7. language_probe — routed to the language-specific helper skill (stack-trace-python-probe, stack-trace-js-probe, stack-trace-go-probe, stack-trace-rust-probe, or generic fallback)

The root_cause and repro_suggestion steps fan the signals into a hypothesis, concrete fix targets, and verification commands. The final summary labels degraded evidence sources explicitly before persisting the incident.

Trigger surface

Fire by saying investigate stack trace or one of the localized triggers listed in the frontmatter, with the traceback pasted into the same turn.

Fallback

If any leaf step fails, the orchestrator surfaces partial outputs in step_outputs. Operator should manually run rg <symbols>, gh issue list --search, git log, and memory search and synthesize the report by hand.