# Settings Management

[Pydantic Settings](https://github.com/pydantic/pydantic-settings) provides optional Pydantic features for loading a settings or config class from environment variables or secrets files.

Settings are validated from environment variables and secrets files, so a
[`ValidationError`](/guides/pydantic-core-pydantic-core) here points at an environment value that didn't match
its field. [Logfire](/guides/error-messages-troubleshooting) can record failed validations and their structured
errors, so you can see which setting failed and why.

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## Related pages

- [API Documentation](./api-documentation-index.md)
- [Concepts](./concepts-index.md)
- [Dev Tools](./dev-tools-index.md)
- [Error Messages](./error-messages-index.md)
- [Examples](./examples-index.md)
- [Integrations](./integrations-index.md)
- [Internals](./internals-index.md)
- [Production Tools](./production-tools-index.md)
- [Pydantic](./pydantic-index.md)
- [Pydantic Core](./pydantic-core-index.md)

# Agent Instructions

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