Wrap Up Session

Step 1: Decide whether anything is worth writing down

Review the conversation for learnings that will still matter next month. The default is to write nothing. Documentation that restates the code is worse than no documentation: nobody reads it, and it goes stale the moment the code changes.

Skip it if any of these is true:

• It's discoverable by reading the code, the schema, git history, or config
• A manifest or lockfile already pins it — versions above all
• A linter, type, or test already enforces it
• It's a narrative of what happened this session — what broke, what you tried, which ticket it was
• It's a file or method inventory
• It only mattered to this task

What survives that bar is usually one of two things: a rule this project has settled on, or a fact about the outside world the code can't reveal on sight — how a library actually behaves, an API that contradicts its own docs, a database rule with a surprising edge.

Step 2: Route it

Update an existing file rather than adding one. A new file is justified only when no existing file covers the topic. If nothing in the table fits, ask the user — don't invent a folder.

Read the "What belongs in a convention file" section of docs/CONVENTIONS.md before writing a convention, and keep new docs/CONVENTIONS.md entries to one clause with an accurate <!-- paths: --> glob so the hook surfaces them.

If .github/instructions/conventions.instructions.md exists and the session changed what it asserts, update it. It points at docs/CONVENTIONS.md; never copy a convention into it.

Subsystem and guide docs follow the same restraint: state the shape of the thing and the decisions behind it, not a method-by-method tour. A mermaid diagram of how the pieces relate is worth more than prose describing the same relationships. Never add convention detail to AGENTS.md — it points at docs/CONVENTIONS.md — and keep it under 50 lines.

Step 3: Prune while you're there

If the session showed an existing doc to be wrong, stale, or bloated, fix or delete it. Removing a paragraph that no longer holds counts as a successful wrap-up on its own.

Step 4: Report

Summarize what was updated:

• Which files were created or edited and why
• What was routed where (convention vs guide vs subsystem vs AGENTS.md)
• What was intentionally skipped and why