# WARNING: foo 1.0.0 does not provide the extra 'devtools'

- **ID:** `python/pip-extras-unknown-extra`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Requesting an extra that isn't declared in the package metadata.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   python -m pip show foo
pip install "foo[dev]"
   ```
2. **** (80% success)
   ```
   pip install pytest black  # dependencies the extra would have pulled
   ```

## Dead Ends

- **** — The extra simply doesn't exist in metadata; forcing does not create it. (80% fail)
- **** — If 'all' extra is also undefined, same warning. (60% fail)