> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://contentful.com/developers/docs/references/preview-session-api/entities/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://contentful.com/developers/docs/_mcp/server.

# Entities


## API Docs

- Entities [Update an entity in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-entity.md)
- Entities [Update an Experience in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-experience.md)
- Entities [Upsert a DataAssembly in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-data-assembly.md)
- Entities [Update a Component in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-component.md)
- Entities [Update an ExperienceTemplate in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-experience-template.md)
- Entities [Update an ExperienceFragment in a preview session](https://contentful.com/developers/docs/references/preview-session-api/entities/update-preview-session-experience-fragment.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://contentful.com/developers/docs/openapi.json)
- [OpenAPI YAML](https://contentful.com/developers/docs/openapi.yaml)