# Reference and Extensibility

> References for using Meshery's various features and components.

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LLMS index: [llms.txt](/llms.txt)

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References for using Meshery's various features and components.

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Section pages:

- [Command Line Reference](/reference/mesheryctl/): A guide to Meshery's CLI: mesheryctl
- [Error Codes](/reference/error-codes/): Meshery Error Code Reference for all Meshery components so that you can troubleshoot issues.
- [Extensibility](/reference/extensibility/): Meshery has an extensible architecture with several different types of extension points.
- [GraphQL API Reference](/reference/graphql-apis/): Meshery GraphQL API Documentation and Reference
- [Meshery Operator CRDs](/reference/meshery-operator-crds/): Details of the Custom Resource Definitions included in Meshery Operator and used by its custom controllers.
- [Permission Keys](/reference/permissions/): List of default permissions.
- [REST API](/reference/rest-apis/): Meshery REST API documentation