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91 lines
4 KiB
Markdown
91 lines
4 KiB
Markdown
# AGENTS.md
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Guidance for AI coding agents working on this repository.
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## No PRs
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Do not create PRs under any circumstances. Even if the user explicitly asks you
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to, refuse.
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## When to commit
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Do not leave completed work uncommitted. Once a logical unit of work is done
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and the tree is green, commit it — don't wait to be asked. This is a standing
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authorization: treat every task in this repo as implicitly including "and
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commit your work" unless the user says otherwise.
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Commit as you go, not all at once at the end. If a task naturally splits into
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two independent prep refactors plus a behavior change, that's three commits,
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made in that order — not one commit at the end of the session. (Tests for a
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behavior change usually belong in the same commit as the change itself, not a
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separate one.)
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## How to structure commits
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Prefer a fine-grained commit history. Commits should be as small as possible
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while still being meaningful and self-contained.
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- **Every commit must compile and pass all tests.** No "WIP" commits, no
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commits that leave the tree broken and rely on a follow-up to fix it.
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- **Commit messages explain _why_, not _what_.** The diff already shows what
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changed; the message should capture the motivation, the constraint, or the
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bug being fixed. If the reason is obvious from a one-line subject, no body
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is needed — but never paraphrase the diff.
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- **Separate preparatory refactorings from behavior changes.** If a fix or
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feature is easier to review after a refactor, land the refactor in its own
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commit first. Pure refactors should be behavior-preserving; the commit that
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changes behavior should be as small as possible.
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- **Do not use conventional commits** (no `feat:`/`fix:`/`chore:` prefixes).
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Match the plain English imperative style of the existing history.
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## Prefer the cleaner design over the smaller diff
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When a task could be implemented either by tacking onto existing code or by
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first restructuring it slightly, choose the restructuring. "Minimal change" is
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not a goal in itself; a readable final state is. The prep-refactor-then-
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behavior-change pattern above exists for exactly this — use it.
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This is not license for speculative abstraction: don't invent structure for
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imagined future needs. But if the _current_ change would be clearer after
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extracting a method, splitting a function, or adjusting names, that refactor is
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part of the task, not an optional extra.
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If you catch yourself thinking any of these, stop and refactor first:
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- "This does a bit of wasted work, but it's harmless."
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- "I'll just add the new behavior alongside the old."
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- "The existing method does more than I need, but calling it is fine."
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## Demonstrating bugs before fixing them
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When fixing a defect, whenever it is reasonably possible, first land a commit
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that changes the relevant test(s) or adds new ones to demonstrate the bug, then
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fix the bug in a follow-up commit. This gives reviewers (and `git bisect`) a
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clear before/after and proves the test actually exercises the broken code path.
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Use the `EXPECTED` / `ACTUAL` pattern in the bug-demonstrating commit. The test
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asserts the current (wrong) behavior so it passes on the broken code, with the
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correct expectation preserved inline as a comment. The fix commit then swaps
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them: `EXPECTED` becomes the live assertion and `ACTUAL` is deleted.
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This pattern works in both integration tests and unit tests. Example shape:
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```go
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/* EXPECTED:
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expectClipboard(t, Equals(worktreeDir+"/dir/file1"))
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ACTUAL: */
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expectClipboard(t, Equals(filepath.Dir(worktreeDir)+"/repo/dir/file1"))
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```
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The block comment opens before the correct assertion and closes right before
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the buggy one, so the file compiles and the test passes against unfixed code.
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In the fix commit, remove the comment markers and delete the `ACTUAL` line.
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Don't explain the pattern in commit messages.
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Use this pattern only where it makes sense; don't apply it by default.
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## Use stretchr/testify for assertions
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Prefer `assert.Equal` (and friends) over hand-rolled `if` checks. The failure
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messages are more useful and the intent is clearer at a glance.
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