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license-finder

@opendatahub-io/ai-helpers
8
0

Deterministically find license information for Python packages by checking PyPI metadata first, then falling back to Git repository LICENSE files using shallow cloning.

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SKILL.md

name license-finder
description Deterministically find license information for Python packages by checking PyPI metadata first, then falling back to Git repository LICENSE files using shallow cloning.
allowed-tools Bash, Skill

Python Package License Finder

This skill helps you deterministically find license information for Python packages using a two-step approach: first checking PyPI metadata, then searching the source repository if needed.

Instructions

When a user asks to find the license for a Python package, follow this deterministic process:

Step 1: Check PyPI Metadata

First, attempt to find the license from PyPI using the package inspection script:

./scripts/find_license.py <package_name> [version]

If the script finds a license in the PyPI metadata, stop here and return the license name.

Step 2: Search Git Repository (if PyPI fails)

If no license is found in PyPI metadata, search the package's source repository:

  1. Get the source repository URL from the PyPI metadata (the script will provide it)
  2. Use the shallow-clone skill to clone the repository:
    Skill: git:shallow-clone
  3. Search for LICENSE files in the cloned repository:
    find . -iname "license*" -o -iname "copying*" -o -iname "copyright*" | head -10
  4. Read the license file to identify the license type:
    head -20 <license_file>

Step 3: Report Results

  • License Found: Return the license name (e.g., "MIT License", "Apache-2.0", "GPL-3.0")
  • License Not Found: Report that the license could not be determined

Usage Examples

Find License for Popular Package

./scripts/find_license.py requests

Expected: Find "Apache-2.0" from PyPI metadata

Find License for Package with Missing PyPI License

./scripts/find_license.py some-package

Expected: Fall back to repository search if PyPI metadata is incomplete

Specific Version Analysis

./scripts/find_license.py django 4.2.0

Expected: Find license for specific Django version

Error Handling

Package Not Found

  • Verify package name spelling
  • Check package availability on PyPI
  • Suggest alternative package names

Repository Access Issues

  • Report if source repository is unavailable
  • Note private/restricted repositories
  • Suggest manual license verification

License File Parsing

  • Handle non-standard license file formats
  • Report unclear or multiple licenses
  • Recommend manual review for complex cases

Integration Notes

This skill complements:

  • python-packaging:complexity - License info helps assess redistribution complexity
  • python-packaging:license-checker - Provides license names for compatibility assessment
  • python-packaging:source-finder - Uses similar PyPI metadata analysis

The skill focuses on finding license information, while license-checker focuses on assessing license compatibility for redistribution.