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typer-and-rich

Use when building or debugging Typer/Rich CLI applications. Activates on Rich table rendering, console output in non-TTY environments, CliRunner testing with Rich output, snapshot testing, Typer command wiring, exception chain prevention with AppExit/AppExitRich patterns, table width at 80-column wrapping, Progress/Live in non-interactive contexts, stderr/stdout separation, or force_terminal vs width configuration. Grounds AI-generated CLI code in verified correctness patterns and prevents known Typer/Rich integration mistakes.

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Jamie-BitFlight/claude_skills
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SKILL.md (original)

Review the instructions the agent will receive before you install.

Typer and Rich Best Practices

<user_input>$ARGUMENTS</user_input>

If <user_input/> contains a directory or file then that is what should be examined against this guide specifically. Start immediately. If it is empty, then use this as a reference for existing tasks.

Correctness patterns for building CLI applications with Typer and Rich, focused on non-TTY environments and common failure modes. For API reference, load the dedicated skills:

  • Skill(skill="python-engineering:typer") — Typer CLI framework API reference
  • For Rich API reference, see ../python3-cli/references/rich-console-and-markup.md and related Rich references

Non-TTY and Programmatic Usage

Consult python-engineering:standards-for-python-development for the shared rules (architecture, typing, testing, CLI rules).

See ../python3-cli/references/typer-rich-non-tty-patterns.md — Console behavior without TTY, width defaults, force_terminal vs width, Progress/Live in non-interactive contexts, environment variables.

Rich Table Width Measurement

See ../python3-cli/references/typer-rich-tables.md — width measurement pattern that prevents wrapping at 80 columns in non-TTY output.

Testing Patterns

See ../python3-cli/references/typer-rich-testing-patterns.md — capturing Rich output in pytest, CliRunner with Rich, snapshot testing, common assertion mistakes.

Exception Chain Prevention

See ../python3-cli/references/typer-rich-exception-handling.md — Typer exception chain prevention with AppExit and AppExitRich patterns. Read when implementing error handling in Typer CLI applications.

Working Script Examples

See ../python3-cli/assets/typer_examples/index.md — working scripts demonstrating non-TTY display solutions. Read when troubleshooting display and layout of terminal applications.

See ../python3-cli/assets/python-cli-demo.py — complete working CLI demo with all patterns (PEP 723 shebang, Typer + Rich integration, modern Python 3.11+, async processing). Read when creating a new CLI tool as a reference implementation.

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