mirror of
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Zhengchao An
d1db9a10cd
Agent-instruction and architecture docs had drifted from the code: - CLAUDE.md: slim to commands + pointers; fix wrong claim that `make pre-commit` is the full pre-PR gate (that is `make pre-pr`); drop stale pre-#3929 file paths and merged bug narratives - AGENTS.md: drop dead `rust-refactor-helper` skill rule and the hand-maintained (already stale) scoped-AGENTS index; link architecture docs from Sources of Truth - .github/AGENTS.md: replace the outdated copied CI command matrix with a pointer to ci.yml - crates/AGENTS.md: merge duplicated Testing sections - ARCHITECTURE.md: resolve the utils->config contradiction (edges are removed), mark volatile counts as snapshots, fix a bad path - docs/architecture: add README router; move one-shot plans/trackers (rebalance-decommission phases, migration-progress ledger, PR template) to docs/superpowers/plans with archive headers; fix stale source paths in kept inventories (core/sets.rs, core/pools.rs, store/mod.rs, startup_* split from #3671) - docs/operations/tier-ilm-debugging.md: extracted tier debugging playbook with corrected paths - scripts/check_doc_paths.sh: new guard failing pre-commit/pre-pr when instruction/architecture docs reference nonexistent file paths - .claude/skills: add tier-debug and arch-checks repo skills; .gitignore now keeps .claude/skills and docs/operations committable Verification: ./scripts/check_doc_paths.sh, ./scripts/check_architecture_migration_rules.sh (both pass) Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
50 lines
2.9 KiB
Markdown
50 lines
2.9 KiB
Markdown
# Crates Instructions
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Applies to all paths under `crates/`.
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## Library Design
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- Treat crate code as reusable library code by default.
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- Prefer `thiserror` for library-facing error types.
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- Do not use `unwrap()`, `expect()`, or panic-driven control flow outside tests.
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## Error Type Design
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- Public API functions must return a typed error enum (preferably `thiserror`-derived), never `Result<_, String>`.
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- Do not use `Box<dyn Error>` or `Box<dyn Error + Send + Sync>` in public trait methods or struct methods. Define a concrete error type with specific variants.
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- When implementing `std::error::Error`, always override `fn source()` if you store an inner error. Breaking the error chain makes debugging impossible.
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- Internal helpers that return `Result<_, String>` and are immediately wrapped via `.map_err(Error::other)` should return the actual error type directly.
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## Concurrency
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- Document lock acquisition order when a module uses multiple locks. Never acquire the same set of locks in different orders across code paths.
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- Never hold a `tokio::sync::RwLock`/`Mutex` write guard across `.await` points unless the critical section is unavoidably async and the hold time is bounded.
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- Prefer `compare_exchange` loops over load-then-store for concurrent counters (peak values, adaptive heuristics).
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- When resetting multi-field atomic statistics, use a version/sequence counter or accept that concurrent readers may see partial snapshots; document the tradeoff.
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- `std::sync::Mutex` is acceptable in async context only when held for a brief, non-`await`-containing critical section. If in doubt, use `tokio::sync::Mutex`.
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## Recursion Safety
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- Recursive tree/graph traversals must have a depth limit (e.g., `max_depth` counter) or use an iterative approach with an explicit `Vec` stack.
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- This applies to cache trees, directory walks, and any user-influenced hierarchy.
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- A corrupted or malicious input must not be able to overflow the thread stack.
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## Type Casting
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- Never use `as` for numeric conversions that may truncate or overflow. Use `try_into()` with explicit error handling, or clamp with `value.max(0) as usize` when the domain is bounded.
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- `f64 as usize` saturates but is fragile; clamp to `[0, usize::MAX as f64]` first.
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- Treat every `as` cast in a PR review as a potential bug; require justification.
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## Testing
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- Keep unit tests close to the module they test.
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- Keep integration tests under each crate's `tests/` directory.
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- Add regression tests for bug fixes and behavior changes.
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- Every test function must contain at least one `assert!`/`assert_eq!`/`assert_matches!`. A test that only calls code without asserting is not a test.
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- In tests, prefer `.expect("context: what was being tested")` over bare `.unwrap()`. A test failure should tell you which operation failed and with what input.
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## Async and Performance
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- Keep async paths non-blocking.
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- Move CPU-heavy operations out of async hot paths with `tokio::task::spawn_blocking` when appropriate.
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