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Command.main runs shell completion before its ClickException handler. A custom Group.get_command that calls ctx.fail() therefore printed a full traceback instead of the usage error. Catch ClickException in _main_shell_completion and show it the same way as a normal invocation. Fixespallets#2853 Signed-off-by: elix3r <157088510+22elix3r@users.noreply.github.com>
davidism
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Aug 27, 2026
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Summary
Command.mainhandles shell completion before it enters theClickExceptionhandler. A customGroup.get_commandthat callsctx.fail()(the documented alias/prefix pattern) therefore prints a traceback during tab completion instead of the usage error.Normal invocation of the same prefix already shows
Error: Too many matches: ...and exits 2. Completion should do the same.Related Issue
Fixes#2853
Changes Made
ClickExceptioninCommand._main_shell_completion, callshow(), and exit with the exception's exit code.Testing
pytest tests/test_shell_completion.py tests/test_commands.py tests/test_basic.py(265 passed)pytest(1993 passed, 24 skipped, 1 xfailed)ruff check/ruff formaton the touched filesTests use the documented ambiguous-prefix
get_commandpattern: completion ofcli ino longer traceback, and a normalcli iinvoke still reports the usage error.Notes
Completion still uses
resilient_parsingfor missing commands and invalid values. This only covers exceptions thatget_command(or similar) raises on purpose viactx.fail().