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skills/python-review/references/default-config.md

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+# Default Config
+
+Baseline mypy and ruff settings used when `pyproject.toml` is absent or incomplete.
+
+## mypy (strict mode)
+
+```ini
+[mypy]
+python_version = 3.13
+strict = true
+warn_return_any = true
+warn_unused_ignores = true
+warn_redundant_casts = true
+disallow_untyped_defs = true
+disallow_incomplete_defs = true
+check_untyped_defs = true
+disallow_any_generics = true
+no_implicit_reexport = true
+```
+
+## ruff
+
+```toml
+[tool.ruff]
+target-version = "py313"
+line-length = 88
+
+[tool.ruff.lint]
+select = [
+  "E",    # pycodestyle errors
+  "W",    # pycodestyle warnings
+  "F",    # pyflakes
+  "UP",   # pyupgrade
+  "B",    # flake8-bugbear
+  "SIM",  # flake8-simplify
+  "I",    # isort
+  "RUF",  # ruff-specific
+  "ANN",  # flake8-annotations (public API must be typed)
+]
+ignore = [
+  "ANN101",  # missing type for self
+  "ANN102",  # missing type for cls
+]
+```
+
+## pyproject.toml Priority Rules
+
+When `pyproject.toml` exists, always prefer its values over these defaults:
+
+| Config key | Behaviour |
+|---|---|
+| `[tool.mypy] strict = false` | Still enforce strict — mention the deviation to the user |
+| `[tool.mypy] python_version` | Use as-is; warn if < 3.13 |
+| `[tool.ruff.lint] ignore` | Respect fully — do not flag ignored rules |
+| `[tool.ruff] line-length` | Use for E501; default 88 if absent |
+| `[tool.ruff.lint] select` | Merge with defaults — do not drop user selections |