Adopt Skylos dead-code detection - #69
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Summary
WalkthroughThe pull request pins lint and typechecking tools, adds Skylos production dead-code analysis, provisions Makeutil in local and CI workflows, documents the lint architecture, adds contract tests, and removes obsolete Plonk wrappers. ChangesLint tooling and validation
Plonk policy cleanup
Priority: ⬇️ Low Change: Other Merge Risk: 🔵 Low · up to This change adds pinned Makeutil caching and blocking dead-code checks. The cache contract does not verify that the Makeutil executable itself is cached, so an unrelated cache-path change could degrade CI performance without test detection. Caution Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional.
❌ Failed checks (1 error)
✅ Passed checks (14 passed)
Full details: Testing (Overall)Explanation The new tests cover much of the Skylos command composition, but they do not guard all introduced behaviour. Resolution Add contract tests for the CI permission map and for the ordering of Makeutil installation before the full-suite step. Assert that Pinned tools run in line Comment |
Reviewer's GuideAdopts Skylos-based dead-code detection as part of the lint pipeline, removes now-confirmed dead helpers, and codifies the Skylos contract in project configuration, documentation, and tests. Flow diagram for lint pipeline with Skylos dead-code detectionflowchart LR
dev[Developer] --> make_lint[make lint]
make_lint --> ruff_check[ruff check]
make_lint --> interrogate[uv run interrogate]
make_lint --> pyscn[pyscn check]
make_lint --> skylos[SKYLOS dead_code gate]
skylos --> skylos_pass[[Gate passes]]
skylos --> skylos_fail[[Gate fails CI and local lint]]
Flow diagram for Skylos dead-code finding handling processflowchart LR
skylos_run[Skylos dead_code scan] --> finding{Finding reported?}
finding -- No --> done_clean[No action needed]
finding -- Yes --> treat_dead[Treat as dead code]
treat_dead --> caller_verified{Caller verified via dynamic runtime boundary?}
caller_verified -- No --> remove_code[Remove dead code]
caller_verified -- Yes --> whitelist[Add symbol to tool.skylos.whitelist.names and documented in pyproject.toml] --> commit[Commit reviewed allow-list change]
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leynos
marked this pull request as ready for review
September 9, 2026 14:10
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Inline comments:
In @.github/workflows/ci.yml:
- Around line 38-44: Update the CI workflow around the Makeutil installation to
cache ~/.cargo/bin/makeutil using MAKEUTIL_REVISION and MAKEUTIL_TOOLCHAIN in
the cache key. Run the cargo install command only when the cache is missed,
while preserving the pinned revision, toolchain, and existing installation
options.
- Around line 15-16: Add a least-privilege permissions block next to the
workflow job’s existing env configuration, granting only repository contents
read access and the permission required to upload coverage; leave all other
token scopes disabled.
In `@docs/adr-003-python-lint-architecture.md`:
- Line 5: Update the ADR status value to exactly Accepted, removing “on
2026-08-23” from the status line; retain 2026-08-23 only in the Date section.
In `@tests/unit/test_skylos_lint_contract.py`:
- Around line 375-385: Refactor
test_skylos_allow_rejects_missing_or_whitespace_values to use
pytest.mark.parametrize for the four fixed argument and argument-name
combinations, leaving Hypothesis to generate only the whitespace value; reduce
the Hypothesis max_examples setting so the combined parameterized cases
substantially limit _run_skylos_allow subprocess invocations while preserving
coverage.
- Around line 117-131: Cache the result of _makefile_report for the test session
so the Makeutil parser process runs only once and subsequent calls reuse the
same report. Use the smallest appropriate caching mechanism, such as
functools.cache, and update the function docstring to state that the report is
cached.
In `@tests/unit/test_typecheck_contract.py`:
- Around line 7-13: Move the shared REPOSITORY_ROOT setup and
shutil.which("make") validation into fixtures in tests/unit/conftest.py. Update
test_make_typecheck_pins_ty_and_resolves_script_modules and the _make_command
helper in test_skylos_lint_contract.py to consume those fixtures, removing both
duplicated implementations while preserving their existing behavior.
- Around line 23-25: Update the assertions in the test, including the
return-code checks and command-output checks near the visible assertions, to
include descriptive messages. For each return-code assertion, include
result.stderr in the message so command failures expose diagnostics; add
similarly clear messages to the expected stdout assertions, including the
corresponding assertions around line 13.
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⛔ Files ignored due to path filters (1)
uv.lockis excluded by!**/*.lock
📒 Files selected for processing (15)
.github/workflows/ci.yml.gitignoreAGENTS.mdMakefiledocs/adr-003-python-lint-architecture.mddocs/contents.mddocs/developers-guide.mddocs/execplans/plonk-sub-command.mdgit_donkey/plonk.pygit_donkey/plonk_policy.pypyproject.tomlscripts/tests/test_typos_rollout.pytests/unit/test_skylos_lint_contract.pytests/unit/test_typecheck_contract.pytypos.local.toml
💤 Files with no reviewable changes (2)
- docs/execplans/plonk-sub-command.md
- git_donkey/plonk.py
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@coderabbitai Have the following failed checks now been resolved? If further work is required, please provide an AI agent prompt for the remaining work to be done to address these failures. Do not treat warnings as optional or aspirational. Where a change is out of scope for this PR, propose a GitHub issue unless one exists already. (Treat o11y, code safety, documentation and validation coverage as in scope). ❌ Failed check (1 warning)
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '== Relevant source/documentation structure =='
ast-grep outline git_donkey/plonk_policy.py --items all --match 'CompletionCandidate|completed_candidates' --view expanded || true
ast-grep outline docs/developers-guide.md --items all --view expanded || true
printf '%s\n' '== CompletionCandidate and completed_candidates references =='
rg -n -C 4 --glob '!.git/**' \
'CompletionCandidate|completed_candidates|read-only|readonly|marker' \
git_donkey/plonk_policy.py docs/developers-guide.md
printf '%s\n' '== Pull request status and changed files =='
gh pr view 69 --repo leynos/git-donkey --json url,headRefOid,updatedAt,statusCheckRollup,files \
--jq '{url, headRefOid, updatedAt, statusCheckRollup: [.statusCheckRollup[] | {name: .name, status: .status, conclusion: .conclusion}], files: [.files[].path]}'
printf '%s\n' '== Recent commits =='
gh pr view 69 --repo leynos/git-donkey --json commits \
--jq '.commits[] | {oid: .oid, messageHeadline: .messageHeadline, committedDate: .committedDate}'Length of output: 12206
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Actionable comments posted: 2
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Inline comments:
In `@tests/unit/conftest.py`:
- Line 48: Replace all five typ.Callable annotations with cabc.Callable and
import collections.abc as cabc in tests/unit/conftest.py,
tests/unit/test_skylos_lint_contract.py, and
tests/unit/test_typecheck_contract.py. Remove typing as typ from
tests/unit/conftest.py; retain it in the other two modules for their existing
typ.Final, typ.cast, and typ.TYPE_CHECKING uses.
In `@tests/unit/test_skylos_lint_contract.py`:
- Around line 532-538: Add an assertion in the cache validation for cache_step
that verifies cache_inputs["path"] equals "~/.cargo/bin/makeutil", while
preserving the existing cache-key assertions.
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Run the production package through the pinned Skylos scanner in the local lint target and continuous integration. Remove the confirmed unused plonk compatibility wrappers and document the empty, reasoned false-positive allow-list policy.
Run the pinned Ty release through the Makefile and expose the standalone scripts directory for first-party module resolution. Describe the candidate marker as read-only so frozen cleanup candidates satisfy the policy protocol under Ty 0.0.73.
Import Cuprum's guarded Make target for adding named, reasoned Skylos exceptions without permitting empty configuration values. Document the helper in the contributor guidance and protect its contract with a focused regression test.
Run the pinned Skylos scanner under Python 3.14 and keep its scan configuration separate from the whitelist subcommand. Require `SYMBOL` and a reason for documented exceptions so WSL's `NAME` environment variable cannot select an allow-list entry. Parse Makefile contracts with the pinned Makeutil release, provision it for the full-suite coverage job, and document the four-tier lint policy and local bootstrap command.
Reject whitespace-only values before Skylos can write malformed allow-list exceptions. Exercise exact environment forwarding through a recorder, including WSL-owned `NAME` and shell-significant input. Bound the Hypothesis dependency and document the validation contract.
Guard documented whitelist writes with a repository-local `flock` lock and require Makeutil before the test suite executes. Pin strict configuration, exact CLI tokens, and every full-suite CI job in the contracts while keeping recorder forwarding isolated.
Cache the pinned Makeutil binary in the coverage job and run the cargo install only on a cache miss, keyed on the pinned toolchain and revision. Grant the job least-privilege `contents: read` access, since coverage uploads authenticate with `CS_ACCESS_TOKEN`. Parametrize the Skylos whitelist boundary cases so Hypothesis only generates the whitespace value, cache the Makeutil report, and share the repository and make fixtures from `tests/unit/conftest.py`. Pin the cache key and cache-miss guard in the CI contract, and give the typecheck assertions diagnostics that expose command output. Set the lint ADR status to `Accepted` and document the `CompletionCandidate` contract that `completed_candidates` relies on.
Ruff's flake8-type-checking rules treat a module-level collections.abc import used only in annotations as typing-only, so each contract module imports cabc inside its TYPE_CHECKING guard, matching the repository's existing pattern. tests/unit/conftest.py keeps its typing import purely to gate that guard: the from-import form is banned by the import conventions, and a module-level import trips TC003. Extend the parsed tooling contracts at the same time: * assert the Makeutil cache stores the parser binary path * assert every full-suite CI job grants only contents: read * assert Makeutil is installed before the full-suite step runs * assert Ty is absent from TOOLS and the typecheck prerequisites * exercise make makeutil with an empty PATH to cover the report of a missing parser
Rebasing the Skylos dead-code tier onto main's pylint and df12 lint work left the tree failing the newer gates. Bring it back to green: - Restore the blank-line separation between module-level helpers in git_donkey/plonk.py that were lost when the dead helpers were removed. - Adopt main's `# ruff: ignore[rule]` comment form in place of `# noqa`, which Ruff 0.16.6 no longer accepts in the contract tests. - Name the whitelist usage exit status in the Skylos contract test rather than repeating the literal, now that the test-specific magic-value exemption is gone. - Rebuild uv.lock on top of main's version, picking up the current hypothesis release and the pyyaml development dependency. - Reword the developer guide and ADR-003 so the documented lint chain matches the merged Makefile: seven checks, with Skylos last. All commit gates pass: make check-fmt, make test, make typecheck, make lint (Ruff, interrogate, pyscn, both Pylint passes, ambrleaks and Skylos), make markdownlint and make nixie.
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Summary
This draft branch makes Skylos the fourth blocking Python lint tier and
hardens its documented exception boundary. It adopts the production scan from
leynos/episodic@853ed1f,
the behavioural model from leynos/cuprum PR #307,
and the relevant support-infrastructure hardening from
Stilyagi f8f8a35
and Stilyagi ef6c189.
It deliberately omits benchmark logic, infrastructure, and unrelated
workflow-test helpers.
Skylos runs under Python 3.14 because it parses source through its own runtime
Abstract Syntax Tree (AST), preventing newer syntax from producing phantom
dead-code findings. The documented exception boundary uses
SYMBOLratherthan WSL-owned
NAME, rejects missing and whitespace-only values beforeSkylos executes, and serializes its read-modify-write update through an ignored
repository-local
flocklock.make testnow verifies Makeutil before runningits Makefile contracts.
The branch also aligns Ty's script-module search path with continuous
integration, fixes the generic completion-candidate contract, and preserves
the committed spelling-policy configuration in its regression test.
Review walkthrough
for the Python 3.14 CLI, strict production-only scan, Makeutil prerequisite,
and command-first locked whitelist helper.
and their isolated boundary cases,
which parse Makefile rules with Makeutil, pin approved exception sets, find
every full-suite workflow, and exercise whitespace, WSL, and shell-significant
environment values with a recorder and temporary lock path.
for independent pinned Makeutil provisioning before the full coverage suite.
and its Plonk adapter
for the typecheck repair.
developer guidance,
contributor gates,
and the spelling-policy regression.
Validation
mbake validate Makefile: passedmake check-fmt: passedmake lint: passed, including Skylos 4.33.2 under Python 3.14make typecheck: passedmake test: passed (155 tests)make markdownlint: passedmake nixie: passedgit diff --check: passedNotes
Skylos reported no verified false positives, so its allow list and typed
entry-point set remain empty. The sole full-suite continuous-integration job is
the coverage job in
ci.yml;
the contract dynamically fails if another workflow starts a full pytest or
coverage suite without the required Makeutil provisioning.
References
Summary by Sourcery
Adopt Skylos as the blocking production dead-code detector while hardening its exception workflow and related lint, CI, type-checking, documentation, and contract-test safeguards.
New Features:
Enhancements:
Build:
CI:
Documentation:
Tests: