name: investigate-and-plan description: Investigate errors, incidents, or product ideas using both internet research and repo-wide codebase research, then propose a concrete changeset plan with clarifying questions before any implementation. Use when a user asks to investigate, root-cause, or plan changes, or when an Issue or PR is referenced and needs a plan.

Investigate And Plan

Overview

Investigate the request, research external sources and the codebase, and produce a plan for a changeset before writing code. Ask open clarifying questions with defaults, then implement only after the plan is agreed.

Workflow

1) Confirm scope and gather context

• Identify the exact error, feature idea, or decision to investigate.
• If a PR or Issue is referenced, use the GitHub CLI to fetch details and comments.
• List the codebase areas to inspect, including backend, frontend, bot, infra, scripts, tests, docs, and configuration.

2) Research

• Use web.run for internet research, then cite sources for any external facts.
• Search the codebase broadly with targeted deep dives into relevant subsystems.
• Capture findings, constraints, and risks, including any existing TODOs or comments.

3) Propose the changeset

• Provide a concrete plan with files to touch, key edits, data migrations, and test updates.
• Call out assumptions and viable alternatives.
• Ask open questions that block implementation, and provide defaults for each question.
• Do not write code yet.

4) Implement after agreement

• Wait for the plan to be accepted or adjusted.
• Implement the agreed changes, keeping the scope aligned to the plan.
• If new information changes the plan, pause and confirm the update.

5) Validate

• Run the repo check command, prefer yarn run check unless a no-auto-fix run is required.
• Ensure tests, build, lint, end-to-end, and complexity or code stats pass as required by the project.
• Report command outcomes and any remaining gaps.