> For the complete documentation index, see [llms.txt](https://docs-lunar.earthly.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-lunar.earthly.dev/plugin-sdks.md).

# Plugin SDKs

- [Plugins configuration](https://docs-lunar.earthly.dev/plugin-sdks/plugins.md): Overview of the three Lunar plugin types — catalogers, collectors, and policies — that extend the platform's capabilities.
- [lunar-cataloger.yml](https://docs-lunar.earthly.dev/plugin-sdks/plugins/cataloger-plugins.md): Reference for lunar-cataloger.yml, the manifest that defines a cataloger plugin used to sync software catalog information from external systems.
- [lunar-collector.yml](https://docs-lunar.earthly.dev/plugin-sdks/plugins/collector-plugins.md): Reference for lunar-collector.yml, the manifest that defines a collector plugin used to gather live information about components from various sources.
- [lunar-policy.yml](https://docs-lunar.earthly.dev/plugin-sdks/plugins/policy-plugins.md): Reference for lunar-policy.yml, the manifest that defines a policy plugin used to evaluate the health of components against rules.
- [Bash SDK](https://docs-lunar.earthly.dev/plugin-sdks/bash-sdk.md): Overview of the Lunar Bash SDK for building custom catalogers and collectors with shell scripts.
- [Installing dependencies](https://docs-lunar.earthly.dev/plugin-sdks/bash-sdk/dependencies.md): How to install dependencies for Bash collectors and catalogers using a custom Docker image or an install.sh script.
- [Cataloger](https://docs-lunar.earthly.dev/plugin-sdks/bash-sdk/cataloger.md): Write Lunar catalogers in Bash — environment variables and the lunar catalog CLI commands for saving catalog data.
- [Collector](https://docs-lunar.earthly.dev/plugin-sdks/bash-sdk/collector.md): The lunar collect CLI for collecting SDLC metadata into a component's JSON, and the environment available to Lunar collectors.
- [Python SDK](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk.md): Overview of Lunar's Python SDK for writing custom Lunar policies (with collector support coming soon).
- [Installing dependencies](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/dependencies.md): How to install Python dependencies for Lunar policies, using a custom Docker image or native runtime execution.
- [Collector](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/collector.md): Placeholder for the upcoming Python Collector SDK used to gather component metadata in Lunar.
- [Policy](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy.md): Write Lunar policies in Python with the lunar\_policy package — load component metadata, make assertions, and handle pending data.
- [Check](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy/check.md): Reference for the Check class in Lunar's Python Policy SDK — the fluent API for asserting on component metadata and tracking results.
- [CheckStatus](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy/check-status.md): Reference for the CheckStatus enum used to mark Lunar policy outcomes as PASS, FAIL, PENDING, ERROR, or SKIPPED.
- [Node](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy/node.md): Reference for the Node class in Lunar's Python Policy SDK — used to navigate, query, and iterate over component JSON data.
- [NoDataError](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy/no-data-error.md): Reference for the NoDataError exception that signals required component data is not yet collected, marking a Lunar check as pending.
- [SkippedError](https://docs-lunar.earthly.dev/plugin-sdks/python-sdk/policy/skipped-error.md): Reference for the SkippedError exception used to skip a Lunar check when it does not apply to the current component.


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