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# API & Extension Guide

Use this section when you are extending Flow Core or integrating it with another gameplay, tools, or data system.

These pages describe supported runtime and extension surfaces. They also mark boundaries so integrations do not depend on editor internals or generated implementation details.

## Start With

| If you want to...                          | Read                                                                                            |
| ------------------------------------------ | ----------------------------------------------------------------------------------------------- |
| Choose the supported extension surface     | [Extension Points](/flow-core-docs/documentation/api-extension-guide/extension-points.md)       |
| Save or restore custom Blackboard values   | [Persistence](/flow-core-docs/documentation/api-extension-guide/persistence.md)                 |
| Select and instantiate graph assets safely | [Graph Asset Wrapper](/flow-core-docs/documentation/api-extension-guide/graph-asset-wrapper.md) |
| Bridge Flow Core with another system       | [Third-party Bridges](/flow-core-docs/documentation/api-extension-guide/third-party-bridges.md) |
| Understand generated item maintenance      | [Generated Items](/flow-core-docs/documentation/api-extension-guide/generated-items.md)         |

## Pages

* [Extension Points](/flow-core-docs/documentation/api-extension-guide/extension-points.md): Pick the right supported place to add custom nodes, instructions, conditions, values, or persistence behavior.
* [Persistence](/flow-core-docs/documentation/api-extension-guide/persistence.md): Implement stable save/load behavior for supported Blackboard data.
* [Graph Asset Wrapper](/flow-core-docs/documentation/api-extension-guide/graph-asset-wrapper.md): Use graph wrappers when runtime code must choose or instantiate graph assets.
* [Third-party Bridges](/flow-core-docs/documentation/api-extension-guide/third-party-bridges.md): Integrate data, events, and graph selection with external systems.
* [Codegen Pipeline](/flow-core-docs/documentation/api-extension-guide/codegen-pipeline.md): Understand how generated catalogs and public lookup data are produced.
* [Codegen Generators](/flow-core-docs/documentation/api-extension-guide/codegen-generators.md): Understand generator responsibilities and output boundaries.
* [Generated Items](/flow-core-docs/documentation/api-extension-guide/generated-items.md): Rescan or regenerate supported generated outputs when catalogs become stale.


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