Build Python command-line applications with Typer by looking up commands, arguments, options, callbacks, help output, and shell completion. The reference also explains how to test and package an app, and how Typer converts its definitions for Click.
Use when building CLI applications with fastapi/typer — creating commands, defining CLI arguments and options, type-hint-driven parameter parsing, callbacks, context, help customization, shell completion, testing, packaging, or Typer internals. Triggers on: "typer", "typer.run", "typer.Typer", "typer app", "typer command", "typer argument", "typer option", "typer callback", "typer context", "Annotated", "typer.Argument", "typer.Option", "typer.Context", "CliRunner", "add_typer", "rich_markup_mode", "typer completion", "typer autocompletion", "typer echo", "typer test", "typer package", "typer click", "get_command".
Run score Not tested
See how to installReview the instructions the agent will receive before you install.
Reference for building CLI applications with typer. Covers the public API, type-driven parameter declaration, and how Typer wraps Click internally.
Load the reference that matches your task. When in doubt, load multiple references.
| Keywords | Reference |
|---|---|
| Typer, typer.run, app, @app.command, @app.callback, add_typer, subcommand, group, one or multiple commands, TyperInfo, CommandInfo, suggest_commands, invoke_without_command | references/commands.md |
| typer.Argument, typer.Option, Annotated, default value style, Ellipsis, required, optional, envvar, prompt, confirmation_prompt, short name, metavar, show_default, help, OptionInfo, ArgumentInfo, ParamMeta | references/parameters.md |
| type conversion, parameter type, str, int, float, bool, Enum, Literal, choices, case_sensitive, FileText, FileTextWrite, FileBinaryRead, FileBinaryWrite, pathlib.Path, exists, min, max, clamp, count, DateTime, UUID, list, tuple | references/parameter-types.md |
| typer.Context, ctx, CallbackParam, invoked_subcommand, resilient_parsing, allow_extra_args, ignore_unknown_options, find_root, find_object, ensure_object, fail, abort, exit, get_parameter_source | references/context.md |
| help, docstring, rich, rich_markup_mode, rich_help_panel, markdown help, deprecated, epilog, printing, echo, style, secho, stderr, rich markup, suggest_commands | references/help-output.md |
| completion, shell completion, install-completion, show-completion, autocompletion, incomplete, shellingham, custom completion, completion function | references/completion.md |
| testing, pytest, CliRunner, Result, invoke, exit_code, input, isolated filesystem | references/testing.md |
| package, pyproject.toml, project.scripts, wheel, python -m, main.py, publish, docs generation | references/package.md |
| internals, source code, main.py, core.py, models.py, utils.py, _click, vendored click, get_command, get_group_from_info, get_command_from_info, get_callback, TyperGroup, TyperCommand, TyperOption, TyperArgument, DefaultPlaceholder, rich_utils | references/internals.md |
skills/cobra/). Typer is Click-based, not cobra-based; Typer's own internals are covered in references/internals.md.Typer versions covered: 0.12+ through 0.27.x. Since v0.26.0 Click is vendored inside typer/_click/, so no external Click dependency exists at runtime (see references/internals.md).
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