overview changedapi/overview
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2929* **[Message Batches API](https://platform.claude.com/docs/en/api/messages/batches/create)**: Process large volumes of Messages requests asynchronously with 50% cost reduction (`POST /v1/messages/batches`)
3030* **[Token Counting API](https://platform.claude.com/docs/en/api/messages-count-tokens)**: Count tokens in a message before sending to manage costs and rate limits (`POST /v1/messages/count_tokens`)
3131* **[Models API](https://platform.claude.com/docs/en/api/models/list)**: List available Claude models and their details (`GET /v1/models`)
32* **[Files API](https://platform.claude.com/docs/en/api/beta/files/upload)**: Upload and manage files for use across multiple API calls (`POST /v1/files`, `GET /v1/files`)
33* **[Skills API](https://platform.claude.com/docs/en/api/skills/create-skill)**: Create and manage custom agent skills (`POST /v1/skills`, `GET /v1/skills`)
3234
3335**Beta:**
3436
35* **[Files API](https://platform.claude.com/docs/en/api/beta/files/upload)**: Upload and manage files for use across multiple API calls (`POST /v1/files`, `GET /v1/files`)
36* **[Skills API](https://platform.claude.com/docs/en/api/skills/create-skill)**: Create and manage custom agent skills (`POST /v1/skills`, `GET /v1/skills`)
3737* **[Agents API](https://platform.claude.com/docs/en/managed-agents/agent-setup)**: Define reusable, versioned agent configurations for Claude Managed Agents (`POST /v1/agents`, `GET /v1/agents`)
3838* **[Sessions API](https://platform.claude.com/docs/en/managed-agents/sessions)**: Run stateful agent sessions in managed cloud sandboxes (`POST /v1/sessions`, `GET /v1/sessions/{id}/events/stream`)
3939* **[Environments API](https://platform.claude.com/docs/en/managed-agents/environments)**: Configure sandbox templates for agent sessions (`POST /v1/environments`, `GET /v1/environments`)
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152152Every SDK provides an auto-paginating iterator that follows `next_page` for you. In Python and TypeScript, you get it by iterating the list result directly. The other SDKs provide the iterator through a separate method. SDK auto-pagination is forward-only; to go back a page, read `prev_page` from the response and pass it back as the `page` parameter yourself. See [client SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) for language-specific details.
153153
154154<Note>
155 Some list endpoints use a different cursor scheme. The [Message Batches API](https://platform.claude.com/docs/en/build-with-claude/batch-processing), the [Files API](https://platform.claude.com/docs/en/build-with-claude/files), the [Models API](https://platform.claude.com/docs/en/api/models/list), and several [Admin API](https://platform.claude.com/docs/en/manage-claude/admin-api) endpoints take `after_id` and `before_id` query parameters instead of `page`. Their responses return `has_more`, `first_id`, and `last_id` instead of `next_page`. Some endpoints that use the `page` scheme, such as `GET /v1/skills`, also return a `has_more` Boolean alongside `next_page`. See the reference page for each endpoint for its exact pagination fields.
155 Some list endpoints use a different cursor scheme. The [Message Batches API](https://platform.claude.com/docs/en/build-with-claude/batch-processing), the [Models API](https://platform.claude.com/docs/en/api/models/list), and several [Admin API](https://platform.claude.com/docs/en/manage-claude/admin-api) endpoints take `after_id` and `before_id` query parameters instead of `page`. Their responses return `has_more`, `first_id`, and `last_id` instead of `next_page`. The [Files API](https://platform.claude.com/docs/en/build-with-claude/files) also uses that scheme when a request includes the `files-api-2025-04-14` beta header; without the header, `GET /v1/files` takes `page` and returns `next_page`. Some endpoints that use the `page` scheme, such as `GET /v1/skills`, also return a `has_more` Boolean alongside `next_page`. See the reference page for each endpoint for its exact pagination fields.
156156</Note>
157157
158158## Rate limits and availability
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