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Hold build_dist's Lazily Imported Audit Module Rather Than Reaching for It Per Line - #1430
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…or It Per Line `_fence_step` calls into `spec/audit.py` once per line, and it scanned `sys.path` and re-entered `import audit` on every one of them. Measured over the 24 authored skills, 4644 lines across the 40 Markdown files they comprise, warm in one process and best of five: 17.5 ms re-resolved against 0.9 ms held, where calling `audit` directly costs 0.7 ms. One `--check` run makes 18708 of these calls, four times that corpus, because it scans the authored tree and both generated trees, and it runs on every pull request. The accessor splits out as `_audit_module`, cached, so the cache sits on a zero-argument function rather than on `_fence_step`, whose arguments vary per line and would make one unbounded. Same shape as `scripts/carry.py` took on #1423. `functools.lru_cache(maxsize=None)` rather than `functools.cache`, which needs 3.9. `scripts/skills_install.py` imports this module at module scope, and `host-setup/*/install-skills.*` and `scripts/skills_install.sh` each commit to Python 3.7+, because that path runs before the fleet's own toolchain exists to install a newer interpreter. Verified on a real 3.8: this branch imports `build_dist` and `skills_install` cleanly with `audit` still unimported, and the `functools.cache` variant raises `AttributeError` at import. Ruff's own py313 target wants to rewrite it back, so the `noqa` carries that reason. Three tests, each proven by removing what it guards. One counts the resolutions and pins them at one however many lines are read. One runs a fresh interpreter and asserts that importing this module still does not import `audit`, the laziness the install path depends on, which was load-bearing and untested. The third is the existing `sys.path` case: holding the module made it vacuous, since the accessor's body then runs once per process and the guard could be deleted with the suite still green, so it now clears the cache between calls and covers that guard again. Closes #1424 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthrough
ChangesLazy audit resolution
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to This change caches lazy audit resolution to reduce repeated import lookup work while retaining deferred loading. The new lazy-import regression test may fail in environments that preload audit during Python startup, so its assertion should compare the import-state delta before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🟢 Approval recommended
The change is low-risk, keeps the required lazy-import contract for older Python installers, and adds direct test coverage for the new caching behavior and its key invariants.
Pull request overview
This pull request optimizes scripts/build_dist.py by caching the lazily imported spec/audit.py module so _fence_step no longer re-scans sys.path and re-enters import audit once per processed line, reducing --check overhead while preserving the required import laziness for older-Python install paths.
Changes:
- Introduces a cached
_audit_module()accessor usingfunctools.lru_cache(maxsize=None)(instead offunctools.cache) to keep compatibility with Python 3.7/3.8 import-time behavior. - Refactors
_fence_stepto delegate through_audit_module()and avoid per-line re-resolution costs. - Adds unit tests covering (1) single resolution across many lines, (2) preserved laziness (importing
build_distdoes not importaudit), and (3) continued protection of thesys.pathguard via cache clearing.
File summaries
| File | Description |
|---|---|
| scripts/build_dist.py | Adds a cached audit-module accessor and routes _fence_step through it to avoid per-line import/path overhead while preserving lazy import semantics. |
| scripts/tests/test_build_dist.py | Adds targeted tests to lock in caching behavior, sys.path guard behavior, and import-time laziness guarantees. |
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Actionable comments posted: 1
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Inline comments:
In `@scripts/tests/test_build_dist.py`:
- Around line 807-808: Update the subprocess assertion around the build_dist
import to record whether audit is already present in sys.modules before
importing build_dist, then compare that baseline with the post-import state to
verify the import does not add audit. Preserve the existing scripts_dir setup
and output-based assertion flow.
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scripts/build_dist.pyscripts/tests/test_build_dist.py
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The laziness case asserted that `audit` was absent from a fresh interpreter's `sys.modules` after importing `build_dist`. A `sitecustomize` or `usercustomize` hook runs before `-c` does and could import a module of that name itself, which would fail the case on a host where the import under test is perfectly correct. It now records the state before the import and asserts the import adds nothing. Where the child already carries such a module at startup, the case cannot read a delta at all, so it skips and says why rather than reporting a finding, which is the boundary-versus-finding split `AGENTS.md` already draws for a check that could not run. Verified three ways: it passes normally, it still fails when an eager `import audit` is put back at module scope, and it skips rather than fails under a `usercustomize` hook that pre-imports a module of that name. Raised by CodeRabbit on #1430. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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…le (#1432) Promote `develop` to `main`. One commit, #1430, which settles #1424. `scripts/build_dist.py`'s `_fence_step` reached into `spec/audit.py` once per line and re-resolved the module every time, scanning `sys.path` and re-entering `import audit`. The accessor is now a cached zero-argument `_audit_module()`, the shape `scripts/carry.py` took for the same defect on #1423. Over the 24 authored skills, 4644 lines across the 40 Markdown files they comprise, warm in one process, best of five: **17.5 ms re-resolved against 0.9 ms held**, where calling `audit` directly costs 0.7 ms. One `--check` run makes **18708** of these calls, four times that corpus, and it runs on every pull request. ## Worth reading before merging The first draft used `functools.cache`, which is 3.9+. `scripts/skills_install.py` imports `build_dist` **at module scope**, and three install wrappers commit to **Python 3.7+** because that path runs before the fleet's own toolchain exists to install a newer interpreter. The draft would have broken `install-skills` at import on a 3.7 or 3.8 host, and every gate passed it, since ruff and mypy both target 3.13. Proven on a real CPython 3.8.20 rather than argued from a version table, and fixed with `lru_cache(maxsize=None)`. Nothing gates that floor, which is now filed as #1431. The local review also caught that holding the module made an **existing** test vacuous: the `sys.path` guard could be deleted with the whole suite still green. It now clears the cache between calls and covers that guard again. CodeRabbit reviewed this one after being rate limited on #1423 and #1426 all evening, and raised that the laziness test read the child interpreter's absolute state rather than the import delta, which a startup hook could break. Fixed, with a skip rather than a vacuous pass where the delta cannot be read at all. Closes #1424 🤖 Generated with [Claude Code](https://claude.com/claude-code)
Closes #1424.
scripts/build_dist.py's_fence_stepcalls intospec/audit.pyonce per line, and it scannedsys.pathand re-enteredimport auditon every one of them. The accessor splits out as a cachedzero-argument
_audit_module(), the shapescripts/carry.pytook for the same defect on #1423.Measured
Over the 24 authored skills, 4644 lines across the 40 Markdown files they comprise, warm in one
process, best of five:
auditdirectlyOne
--checkrun makes 18708 of these calls, four times that corpus, because it scans theauthored tree and both generated trees. It runs on every pull request.
The part that was nearly a regression
The first draft used
functools.cache. That is 3.9+, andscripts/skills_install.pyimports thismodule at module scope, while
host-setup/linux/install-skills.sh,host-setup/windows/install-skills.ps1andscripts/skills_install.sheach commit to Python3.7+, because that path runs before the fleet's own toolchain exists to install a newer
interpreter.
spec/host-tools.json'spython3entry records that floor and why it sits below thefleet's own.
So the draft would have broken
install-skillsat import on a 3.7 or 3.8 host, on the one pathwhose whole purpose is surviving an old one, and the laziness this function already had was there
for exactly that reason.
Verified by running it rather than by reading a version table, on a real CPython 3.8.20:
functools.lru_cache(maxsize=None)is 3.2+ and identical for a zero-argument function. Ruff's ownpy313target wants to rewrite it back tofunctools.cache, so thenoqa: UP033carries thatreason inline.
Tests
Three, each proven by removing what it guards:
audit, run in a fresh interpreter. This is thelaziness the install path depends on, and it was load-bearing and untested before now.
sys.pathcase. Holding the module made it vacuous: the accessor's body thenruns once per process, so the
not in sys.pathguard could be deleted with the whole suite stillgreen. It now clears the cache between calls and covers that guard again. Caught by the local
review pass, which mutation-proved it on both sides of the merge base.
🤖 Generated with Claude Code
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