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Get Skill Claude Developer Platform · in the page api/skills/retrieve …the skill. The format and length of IDs may change over time. ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Versions Claude Developer Platform · in the page api/skills/versions …the skill. The format and length of IDs may change over time. ### Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Create Skill Version Claude Developer Platform · in the page api/skills/versions/create …the skill. The format and length of IDs may change over time. ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Delete Skill Version Claude Developer Platform · in the page api/skills/versions/delete …by its version ID. Requests carrying the `skills-2025-10-02` beta header address versions by their Unix epoch timestamp instead (e.g., "1759178010641129"). ## Headers - `"anthropic-version": opt… List Skill Versions Claude Developer Platform · in the page api/skills/versions/list …tionally set to the `next_page` token from the previous response. ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Get Skill Version Claude Developer Platform · in the page api/skills/versions/retrieve …ost recent version. Requests carrying the `skills-2025-10-02` beta header address versions by their Unix epoch timestamp instead (e.g., "1759178010641129"). ## Headers - `"anthropic-version": opt… User Profiles Claude Developer Platform · in the page api/user_profiles …User Profile **POST** `/v1/user_profiles` Create User Profile ### Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Action URLs Claude Developer Platform · in the page api/user_profiles/action_urls …` The ID of the user profile the action is for (`uprof_...`). ### Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Create Action URL Claude Developer Platform · in the page api/user_profiles/action_urls/create …g` The ID of the user profile the action is for (`uprof_...`). ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Create User Profile Claude Developer Platform · in the page api/user_profiles/create …e User Profile **POST** `/v1/user_profiles` Create User Profile ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Delete User Profile Claude Developer Platform · in the page api/user_profiles/delete …d: string` The ID of the user profile to delete (`uprof_...`). ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… List User Profiles Claude Developer Platform · in the page api/user_profiles/list …_request_error` under the `user-profiles-2026-09-04` and earlier beta headers. Fails with `overloaded_error` when a profile's enforcement actions cannot be read for the moment. - `"unrestricted"`… Get User Profile Claude Developer Platform · in the page api/user_profiles/retrieve …e_id: string` The ID of the user profile to get (`uprof_...`). ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… Update User Profile Claude Developer Platform · in the page api/user_profiles/update …d: string` The ID of the user profile to update (`uprof_...`). ## Headers - `"anthropic-version": optional string` The version of the Claude API you want to use. Read more about versioning… versioning Claude Developer Platform · in the page api/versioning …hen making API requests, you must send an `anthropic-version` request header. For example, `anthropic-version: 2026-10-21`. If you are using the [client SDK](https://platform.claude.com/docs/en/cli-sd… Message Batches API Claude Developer Platform · in the page build-with-claude/batch-processing …plete. ### Extended output (beta) The `output-300k-2026-03-24` beta header raises the `max_tokens` cap to 300,000 for batch requests using Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opu… cache-diagnostics Claude Developer Platform · in the page build-with-claude/cache-diagnostics …utput_config`, `output_format`, or the set of active `anthropic-beta` headers) differs, and very long conversations where the divergence is beyond the comparison horizon. Your request was processed no… claude-in-amazon-bedrock Claude Developer Platform · in the page build-with-claude/claude-in-amazon-bedrock …ken-generator` CLI to mint a bearer token. Pass it in the `x-api-key` header on each request. </Step> </Steps> ## Install an SDK The [client SDK](https://platform.claude.com/docs/en/cli-sdks-libra… claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …URI** for your endpoint). 4. Use either the `api-key` or `x-api-key` header in your requests, or provide it to the SDK. The SDK’s Foundry client requires an API key and either a resource name or bas… anthropic-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/anthropic-managed …/api.anthropic.com`. * **Authentication:** An `Authorization: Bearer` header with a Google access token. Don’t send an `x-api-key` header. * **Workspace:** The workspace ID is part of the URL. Don’t s… google-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/google-managed …:** In a cURL request, pass `anthropic_version` in the body, not as a header. Set it to `vertex-2023-10-16`, or to [API version `2026-10-21`](https://platform.claude.com/docs/en/api/migration-2026-10-… overview Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/overview …Claude API<br />`model` in the request body<br />`anthropic-version` header |… claude-on-amazon-bedrock-legacy Claude Developer Platform · in the page build-with-claude/claude-on-amazon-bedrock-legacy …20260801` or `browser_toolset_20260801` to the `tools` array. No beta header is required for either toolset. ### PDF support on Bedrock [PDF support](https://platform.claude.com/docs/en/build-with-c… claude-platform-on-aws Claude Developer Platform · in the page build-with-claude/claude-platform-on-aws …| | **Beta features** | Pass through with `anthropic-beta` headers (see [feature limitations](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws#features-not-suppo… sent_count = len(messages sent in the compaction request) Claude Developer Platform · in the page build-with-claude/compaction …h context window limits. --- ## Compatibility - Status: Beta - [Beta header](https://platform.claude.com/docs/en/api/beta-headers): `compact-2026-01-12` - [ZDR](https://platform.claude.com/docs/en/ma… compaction-background Claude Developer Platform · in the page build-with-claude/compaction-background …p the block in when it arrives. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-fable-5-1 - claude-m… compaction-keep-recent-turns Claude Developer Platform · in the page build-with-claude/compaction-keep-recent-turns …ter the summary, word for word. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-fable-5-1 - claude-m… compaction-on-demand Claude Developer Platform · in the page build-with-claude/compaction-on-demand …then continue from the summary. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-fable-5-1 - claude-m… compaction-thinking-blocks Claude Developer Platform · in the page build-with-claude/compaction-thinking-blocks …ved thinking, and how to check. featureMetadata: status: beta betaHeader: compact-2026-09-04 supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-fable-5-1 - claude-m… compaction-threshold Claude Developer Platform · in the page build-with-claude/compaction-threshold …ches a token threshold you set. featureMetadata: status: beta betaHeader: compact-2026-01-12 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/e… context-editing Claude Developer Platform · in the page build-with-claude/context-editing …it grows with context editing. featureMetadata: status: beta betaHeader: context-management-2025-06-27 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude… context-windows Claude Developer Platform · in the page build-with-claude/context-windows …h a 1M-token context window, 1M is the default: you don’t need a beta header, and long-context requests are billed at [standard pricing](https://platform.claude.com/docs/en/about-claude/pricing#long-c… effort Claude Developer Platform · in the page build-with-claude/effort …sitive workloads, or up to `max` only when your evals show measurable headroom at `xhigh`. The API default is `high`. To use `xhigh`, set `effort` explicitly. The value you pass overrides the default… effort-per-message Claude Developer Platform · in the page build-with-claude/effort-per-message …tion and keep the prompt cache. featureMetadata: status: beta betaHeader: mid-conversation-output-config-2026-07-01 supportedModels: - claude-fable-5-2 - claude-mythos-5-2 - claude-f… extended-thinking Claude Developer Platform · in the page build-with-claude/extended-thinking …lier Claude 4 models, add the `interleaved-thinking-2025-05-14` [beta header](https://platform.claude.com/docs/en/api/beta-headers) to your API request. The 4.6 generation splits in manual mode: * *… fallback-credit Claude Developer Platform · in the page build-with-claude/fallback-credit …fused request on another model. featureMetadata: status: beta betaHeader: fallback-credit-2026-07-01, server-side-fallback-2026-07-01, fallback-credit-2026-06-01 supportedModels: - claude-fa… fast-mode Claude Developer Platform · in the page build-with-claude/fast-mode …okens per second from supported Claude models. featureMetadata: betaHeader: fast-mode-2026-02-01 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs… files Claude Developer Platform · in the page build-with-claude/files …files-api-2025-04-14` The Files API is out of beta and needs no beta header. Migrating off `files-api-2025-04-14` is optional: requests that send it keep working and keep returning the beta response… handling-stop-reasons Claude Developer Platform · in the page build-with-claude/handling-stop-reasons …precated) and newer models, the API returns this value without a beta header. For earlier models, add the `model-context-window-exceeded-2025-08-26` beta header to enable it. </Note> <CodeGroup> ``… message-threads Claude Developer Platform · in the page build-with-claude/message-threads …e new messages on each request. featureMetadata: status: beta betaHeader: message-threads-2026-08-12 zdr: eligibility: not-eligible note: A thread's contents (the conversation, system pr… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …ple sets effort at the top level of each request, which needs no beta header. 2. **A mode reminder:** a [mid-conversation system message](https://platform.claude.com/docs/en/build-with-claude/mid-conv… mid-conversation-system-messages Claude Developer Platform · in the page build-with-claude/mid-conversation-system-messages …System instructions normally live in the top-level `system` field, ahead of every message in the conversation. That position is great for [prompt caching](https://platform.claude.com/docs/en/build-w… multilingual-support Claude Developer Platform · in the page build-with-claude/multilingual-support …tput quality. </Card> <Card title="Customer support agent" icon="headset" href="https://platform.claude.com/docs/en/about-claude/use-case-guides/customer-support-chat"> Build a customer suppo… pdf-support Claude Developer Platform · in the page build-with-claude/pdf-support …or PDFs you’ll use repeatedly, or when you want to avoid encoding overhead, use the [Files API](https://platform.claude.com/docs/en/build-with-claude/files): <CodeGroup> ```bash cURL # First, upl… preserved-thinking Claude Developer Platform · in the page build-with-claude/preserved-thinking …tions` array require the `thinking-binding-controls-2026-08-01` [beta header](https://platform.claude.com/docs/en/api/beta-headers). [Set the mismatch behavior and read `input_transformations`](https:… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …caches are also invalidated on models that render the configuration ahead of them. See [Thinking and prompt caching](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-and-prompt… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …down primarily for `inline code`, code blocks (```...```), and simple headings (## and ###). Avoid using **bold** and *italics*. DO NOT use ordered lists (1. ...) or unordered lists (*) unless: a) yo… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …ermission when it already has enough to proceed. A “continue” or “go ahead and do it end to end” suffices. To define when pausing is appropriate, pair this with the checkpoint instruction in [Strong i… Delivering work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-1 …Set `display: "updates"` (beta, `thinking-display-updates-2026-08-18` header) and render each non-empty `thinking` block as a status line, or set `"summarized"` to receive them along with summarized r… Finishing work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-2 …ffort-per-message) (beta, `mid-conversation-output-config-2026-07-01` header). That page lists the platforms where it’s available. A change holds until another one replaces it. Where per-message effor…