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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a Python development environment template using **uv** (fast Python package manager) and **Ruff** (linter/formatter). The repository serves dual purposes:
+1. A template for starting new Python projects
+2. A reusable `tools/` package with production-ready utilities (Logger, Config, Timer)
+
+## Development Commands
+
+### Package Management
+```bash
+# Install dependencies
+uv sync
+
+# Add new dependency
+uv add <package>
+
+# Add dev dependency
+uv add --dev <package>
+
+# Remove dependency
+uv remove <package>
+```
+
+### Testing
+```bash
+# Run all tests with coverage (75% minimum required)
+uv run nox -s test
+
+# Run specific test file
+uv run pytest tests/tools/test__logger.py
+
+# Run with JUnit XML output for CI
+uv run nox -s test -- --junitxml=results.xml
+
+# Run pytest directly (bypasses nox)
+uv run pytest
+```
+
+### Linting & Formatting
+```bash
+# Format code
+uv run nox -s fmt
+
+# Lint with both Pyright and Ruff
+uv run nox -s lint -- --pyright --ruff
+
+# Lint with Pyright only
+uv run nox -s lint -- --pyright
+
+# Lint with Ruff only
+uv run nox -s lint -- --ruff
+
+# Run Ruff directly
+uv run ruff check . --fix
+uv run ruff format .
+
+# Run Pyright directly
+uv run pyright
+```
+
+### Pre-commit Hooks
+```bash
+# Install hooks
+uv run pre-commit install
+
+# Run all hooks manually
+uv run pre-commit run --all-files
+
+# Run specific hook
+uv run pre-commit run ruff-format
+```
+
+### Documentation
+```bash
+# Serve docs locally at http://127.0.0.1:8000
+uv run mkdocs serve
+
+# Build documentation
+uv run mkdocs build
+
+# Deploy to GitHub Pages
+uv run mkdocs gh-deploy
+```
+
+## Architecture
+
+### Core Modules
+
+The `tools/` package provides three main utility modules:
+
+#### **tools/logger/** - Dual-Mode Logging System
+- `Logger` class extends `logging.Logger` with environment-aware formatting
+- **LogType.LOCAL**: Colored console output via `LocalFormatter` for development
+- **LogType.GOOGLE_CLOUD**: Structured JSON via `GoogleCloudFormatter` for production
+- Key pattern: Use `Settings.IS_LOCAL` to switch between modes automatically
+
+```python
+from tools.config import Settings
+from tools.logger import Logger, LogType
+
+settings = Settings()
+logger = Logger(
+    __name__,
+    log_type=LogType.LOCAL if settings.IS_LOCAL else LogType.GOOGLE_CLOUD
+)
+```
+
+#### **tools/config/** - Environment-Based Configuration
+- `Settings` class uses Pydantic for type-safe configuration
+- Loads from `.env` (version controlled) and `.env.local` (local overrides, in .gitignore)
+- `FastAPIKwArgs` provides ready-to-use FastAPI initialization parameters
+- Pattern: Extend `Settings` to add project-specific configuration fields
+
+```python
+from tools.config import Settings
+
+settings = Settings()
+api_url = settings.api_prefix_v1  # Loaded from environment
+```
+
+#### **tools/tracer/** - Performance Monitoring
+- `Timer` class works as both decorator and context manager
+- Automatically logs execution time in milliseconds at DEBUG level
+- Uses the `Logger` module for output (inherits logging configuration)
+- Pattern: Nest timers to measure both overall and component performance
+
+```python
+from tools.tracer import Timer
+
+@Timer("full_operation")
+def process():
+    with Timer("step1"):
+        do_step1()
+    with Timer("step2"):
+        do_step2()
+```
+
+### Test Structure
+
+Tests in `tests/tools/` mirror the package structure:
+- **Naming convention**: `test__*.py` (double underscore)
+- **Coverage requirement**: 75% minimum (including branch coverage)
+- **Test files exempt from**: `INP001` (namespace packages), `S101` (assert usage)
+
+### Configuration Philosophy
+
+**Ruff (ruff.toml)**:
+- ALL rules enabled by default with specific exclusions
+- Line length: 88 (Black-compatible)
+- Target Python: 3.14
+- Per-file ignores for test files
+
+**Pyright (pyrightconfig.json)**:
+- Type checking mode: standard
+- Only includes `tools/` package (not tests)
+- venv: `.venv`
+
+**pytest (pytest.ini)**:
+- Coverage: 75% minimum with branch coverage
+- Reports: HTML + terminal
+- Import mode: importlib
+
+### Nox Task Automation
+
+The `noxfile.py` uses a custom `CLIArgs` parser (Pydantic-based):
+- All sessions use `python=False` (rely on `uv run`)
+- Arguments passed via `-- --flag value` syntax
+- Sessions: `fmt`, `lint`, `test`
+
+Example of the argument parsing pattern:
+```python
+# noxfile.py
+@nox.session(python=False)
+def lint(session: nox.Session) -> None:
+    args = CLIArgs.parse(session.posargs)
+    if args.pyright:
+        session.run("uv", "run", "pyright")
+    if args.ruff:
+        session.run("uv", "run", "ruff", "check", ".", "--fix")
+```
+
+## Key Patterns for Development
+
+### Adding New Configuration Fields
+
+Extend the `Settings` class in `tools/config/settings.py`:
+
+```python
+class Settings(BaseSettings):
+    # Existing fields...
+
+    # Add your new fields
+    NEW_SETTING: str = "default_value"
+    ANOTHER_SETTING: int = 42
+```
+
+Then add to `.env.local`:
+```bash
+NEW_SETTING=custom_value
+ANOTHER_SETTING=100
+```
+
+### Adding New Logger Formatters
+
+Create a new formatter in `tools/logger/`:
+1. Extend `logging.Formatter`
+2. Export from `tools/logger/__init__.py`
+3. Update `Logger.__init__()` to support the new type
+
+### Testing Utilities
+
+When testing the utilities themselves:
+- Logger: Capture logs using `assertLogs` context manager
+- Config: Use Pydantic's model instantiation with kwargs to override values
+- Timer: Check debug logs for execution time messages
+
+## Documentation Structure
+
+The `docs/` directory is organized for MkDocs:
+- **docs/index.md**: Main landing page
+- **docs/getting-started/**: Setup guides (Docker, VSCode, Dev Container)
+- **docs/guides/**: Tool usage guides (uv, Ruff, Pyright, pre-commit, tools package)
+- **docs/configurations/**: Detailed configuration references
+- **docs/usecases/**: Real-world examples (Jupyter, FastAPI, OpenCV)
+
+When adding new utilities to `tools/`, add corresponding documentation to `docs/guides/tools/`.
+
+## CI/CD Workflows
+
+GitHub Actions workflows in `.github/workflows/`:
+- **docker.yml**: Validate Docker build
+- **devcontainer.yml**: Validate Dev Container configuration
+- **format.yml**: Check Ruff formatting
+- **lint.yml**: Run Pyright + Ruff linting
+- **test.yml**: Run pytest with coverage
+- **gh-deploy.yml**: Deploy documentation to GitHub Pages
+
+All workflows use the same nox commands as local development.
+
+## Environment Variables
+
+Critical environment variables (set in `.env.local`):
+- `IS_LOCAL`: Boolean flag for local vs production (affects logging, configuration)
+- `DEBUG`: Boolean for debug mode
+- FastAPI settings: `TITLE`, `VERSION`, `API_PREFIX_V1`, etc.
+
+## Important Notes
+
+- **Coverage is enforced**: Tests must maintain 75% coverage (configured in pytest.ini)
+- **uv replaces pip/poetry**: Use `uv add` not `pip install`, use `uv.lock` not `requirements.txt`
+- **Ruff replaces multiple tools**: No need for Black, isort, Flake8, etc.
+- **nox is the task runner**: Prefer `uv run nox -s <session>` over direct tool calls
+- **Test naming**: Use `test__*.py` pattern (double underscore)
+- **Type checking targets tools/ only**: Pyright only checks the `tools/` package, not tests
+
+## Template Usage Pattern
+
+When using this as a template for a new project:
+1. Update `pyproject.toml` with new project name/description
+2. Modify or extend `tools/config/settings.py` for project-specific configuration
+3. Use the utilities from `tools/` or remove if not needed
+4. Update `.env` with base configuration, `.env.local` with local overrides
+5. Customize Ruff rules in `ruff.toml` if needed (but start with defaults)