# Changelog

## Score

- CAI 60 → 66 (+6.6)
- Rubric changed (rubric-2026.08.17 → rubric-2026.08.18) — scores are not directly comparable.

## Lenses

- Code Health 78 → 78 (-0.2)
- Architecture 90 → 90 (+0.1)
- Maturity 85 → 79 (-6.8)
- Readiness 49 → 55 (+6.6)
- Security 58 → 77 (+18.8)
- Domain Modelling 100 → 100 (+0.0)
- Event Sourcing 100 → 100 (+0.0)
- Accessibility 70 → 70 (+0.0)

## Resolved (167)

- BoundTypeVarInstance.apply_type_mapping_impl (cyclomatic 16) (crates/ty_python_semantic/src/types/typevar.rs)
- Boundary-crossing change coupling: db.rs ↔ ty_check_invalid_syntax.rs (crates/ruff_graph/src/db.rs)
- CallArguments.expand (cyclomatic 16) (crates/ty_python_semantic/src/types/call/arguments.rs)
- CallableDescription.new (cyclomatic 16) (crates/ty_python_semantic/src/types/call/bind.rs)
- Change coupling: codes.rs ↔ mod.rs (crates/ruff_linter/src/codes.rs)
- Change coupling: codes.rs ↔ mod.rs (crates/ruff_linter/src/codes.rs)
- Change coupling: codes.rs ↔ mod.rs (crates/ruff_linter/src/codes.rs)
- Change coupling: codes.rs ↔ mod.rs (crates/ruff_linter/src/codes.rs)
- Change coupling: format.rs ↔ format_range.rs (crates/ruff_server/src/server/api/requests/format.rs)
- ClassDecoratorUnknownResultPolicy.known_from_decorator (cyclomatic 16) (crates/ty_python_semantic/src/types/infer/builder/class.rs)
- ClassType.into_callable (cognitive 22) (crates/ty_python_semantic/src/types/class.rs)
- ClassType.into_callable (cyclomatic 16) (crates/ty_python_semantic/src/types/class.rs)
- CodeActions.run_with_snapshot (cyclomatic 16) (crates/ruff_server/src/server/api/requests/code_action.rs)
- ConfigArgumentParser.parse_ref (cyclomatic 16) (crates/ruff/src/args.rs)
- Consequences/trade-offs are cut by the scanner clip marker and not flagged as missing; only context and decision are visible (crates/ty_python_semantic/resources/mdtest/regression/3208_recursive_protocol_signature.md)
- Decision and consequences are absent; only a test is shown (crates/ty_python_semantic/resources/mdtest/regression/3020_callable_type_of.md)
- Decision is a code-assertion test with no context or consequences; the body is boilerplate stubs of static_assert calls (crates/ty_python_semantic/resources/mdtest/regression/2236_tuple_is_disjoint.md)
- Definitions.resolve (cyclomatic 16) (crates/ruff_python_semantic/src/definition.rs)
- Dependency hygiene not measured — no supported dependency manifest was read
- DisplayParameters.fmt_detailed (cognitive 32) (crates/ty_python_semantic/src/types/display.rs)
- …and 147 more

## New (201)

- ArgumentTypeChecker::check_argument_type (cognitive 17) (crates/ty_python_semantic/src/types/call/bind.rs)
- ArgumentTypeChecker::evaluate_paramspec_sub_call (cognitive 17) (crates/ty_python_semantic/src/types/call/bind.rs)
- AssignmentAttributeWriteEvaluator::evaluate_class (cognitive 27) (crates/ty_python_semantic/src/types/infer/builder/attribute_assignment.rs)
- Change coupling: capabilities.rs ↔ requests.rs (crates/ty_server/src/capabilities.rs)
- Change coupling: dunder_all.rs ↔ class.rs (crates/ty_python_semantic/src/dunder_all.rs)
- Change coupling: expression.rs ↔ codes.rs (crates/ruff_linter/src/checkers/ast/analyze/expression.rs)
- Change coupling: fix.rs ↔ lint.rs (crates/ruff_server/src/fix.rs)
- Change coupling: goto_type_definition.rs ↔ hover.rs (crates/ty_server/src/server/api/requests/goto_type_definition.rs)
- Change coupling: lib.rs ↔ requests.rs (crates/ty_ide/src/lib.rs)
- Change coupling: mod.rs ↔ check_docstring.rs (crates/ruff_linter/src/rules/pydoclint/mod.rs)
- Change coupling: server.rs ↔ requests.rs (crates/ty_server/src/server.rs)
- Change coupling: symbol.rs ↔ infer.rs (crates/ty_python_core/src/symbol.rs)
- Change coupling: testing.rs ↔ program.rs (crates/ty_module_resolver/src/testing.rs)
- ClassType::into_callable_with_receiver (cognitive 26) (crates/ty_python_semantic/src/types/class.rs)
- ClassType::into_callable_with_receiver (cyclomatic 16) (crates/ty_python_semantic/src/types/class.rs)
- Critical CVE: [GHSA redacted] (playground/package-lock.json)
- Dependency hygiene not measured — dependency manifest found but not parsed for hygiene
- DisplayParameters::fmt_detailed::display_parameters (cognitive 20) (crates/ty_python_semantic/src/types/display.rs)
- Document::propagate_expand::propagate_expands (cognitive 21) (crates/ruff_formatter/src/format_element/document.rs)
- Document::propagate_expand::propagate_expands (cyclomatic 21) (crates/ruff_formatter/src/format_element/document.rs)
- …and 181 more

## Changes since last survey

- 211 commits — 190 feature/other, 21 fixes

## By area

- crates/ty_python_semantic — 69 commits
- (root) — 39 commits
- crates/ruff_linter — 39 commits
- .github/workflows — 16 commits
- crates/ruff — 8 commits
- crates/ty_ide — 8 commits
- crates/ty — 4 commits
- python/ruff-ecosystem — 4 commits
- crates/ruff_db — 3 commits
- docs/requirements.txt — 3 commits
- crates/ruff_python_parser — 2 commits
- crates/ty_project — 2 commits
- crates/ty_python_core — 2 commits
- crates/ty_server — 2 commits
- playground/api — 2 commits
- (repo) — 1 commit
- crates/ruff_benchmark — 1 commit
- crates/ruff_dev — 1 commit
- crates/ruff_server — 1 commit
- crates/ty_site_packages — 1 commit

## Notable commits

- fix: Fix `format --check` spans for syntax errors (#27045)
- fix: Fix indexing of excluded nested Ruff workspaces (#27303)
- fix: Stabilize fix diffs in full `check` output (#26958)
- fix: [`flake8-comprehensions`] NFKC-normalize keyword names in `C408` fix (#26813)
- fix: [`flake8-pytest-style`] Make fixes safe by default and unsafe only when comments are present (`PT018`) (#27201)
- fix: [`pydocstyle`] Document fix safety (`D400`) (#26971)
- fix: [`pylint`] Add missing fix safety gotchas for `non-augmented-assignment` (`PLR6104`) (#27250)
- fix: [`pyupgrade`] Skip fix when a defaulted `TypeVar` precedes a non-defaulted one (`UP040`, `UP046`, `UP047`) (#27133)
- fix: [`refurb`] Mark fixes that remove unknown separators as unsafe (`FURB105`) (#27200)
- fix: [`ruff`] Fix false positive with unpacked arguments (`RUF065`) (#26959)
- fix: [`ruff`] Fix missing check on unrecognized early bound (`RUF016`) (#26986)
- fix: [ty] Fix Just[float] protocol matching (#27053)
- fix: [ty] Fix ParamSpec declaration hover and type navigation (#27183)
- fix: [ty] Fix Self binding for classmethod __new__ constructors (#27030)
- fix: [ty] Fix `missing-override-decorator` suggestion before Python 3.12 (#27166)
- fix: [ty] Fix double specialization of generic type aliases (#27058)
- fix: [ty] Fix gradual class assignability with generic receivers (#27223)
- fix: [ty] Fix identity narrowing for NewTypes (#26439)
- fix: [ty] Fix nested short-circuit flow snapshots (#26956)
- fix: [ty] Fix type and TypeForm intersections (#27099)
- …and 191 more