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2727| [Browser use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool) | Lets Claude navigate, read, and interact with webpages in your own browser environment. |
2828| [Citations](https://platform.claude.com/docs/en/build-with-claude/citations) | Claude’s answers about your documents cite the exact passages that support each claim. |
2929| [Classifier refusals](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) | Safety classifiers on some models can decline a request; the decline comes back as a normal response, not an error. |
30| ↳ [Client-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback) | A middleware in the Claude SDKs that retries a refused request on the fallback models you list. |
30| ↳ [Client-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback) | A middleware in the Anthropic SDKs that retries a refused request on the fallback models you list. |
3131| ↳ [Fallback credit](https://platform.claude.com/docs/en/build-with-claude/fallback-credit) | Bills a retry of a refused request on another model as if the conversation had been on that model from the start, so you do not pay the prompt-cache write twice. |
3232| ↳ [Server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#server-side-fallback) | The API retries a refused request on a fallback model within the same call and returns one response. |
3333| [Computer use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) | Gives Claude screenshot, mouse, and keyboard control of a desktop environment. |
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3434| [Custom tools](https://platform.claude.com/docs/en/agents-and-tools/tool-use/define-tools) | Tools you define with a name, description and input schema. Claude asks to call them; your code runs them and returns the result. |
3535| [Data residency](https://platform.claude.com/docs/en/manage-claude/data-residency) | Controls for where model inference runs (inference geo) and where data is stored at rest (workspace geo). |
3636| [Effort](https://platform.claude.com/docs/en/build-with-claude/effort) | A setting that controls how many tokens Claude spends on a response, trading thoroughness for token efficiency. |
37| ↳ [Per-message effort](https://platform.claude.com/docs/en/build-with-claude/effort#change-effort-mid-conversation-beta) | Changing the effort level for later turns of a conversation with a per-message `output_config`, which keeps the prompt cache. |
37| ↳ [Per-message effort](https://platform.claude.com/docs/en/build-with-claude/effort-per-message) | Changing the effort level for later turns of a conversation with a per-message `output_config`, which keeps the prompt cache. |
3838| [Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) | Up to 2.5 times more output tokens per second from supported models, at premium pricing. |
3939| [Files API](https://platform.claude.com/docs/en/build-with-claude/files) | Upload a file once and refer to it by `file_id` in later requests, and download files that skills or the code execution tool create. |
4040| [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector) | Connect Claude to remote MCP servers so it can call their tools, without running your own MCP client. |
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4444| ↳ [Mid-conversation tool changes](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages#mid-conversation-tool-changes) | Offer or withdraw tools partway through a conversation without changing the tools array, so the cached prefix stays valid. |
4545| ↳ [Turn-scoped system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages#turn-scoped-system-messages) | A mid-conversation system message that applies only until the next user message, then stays in the history but renders nothing and costs no input tokens. |
4646| [Multilingual support](https://platform.claude.com/docs/en/build-with-claude/multilingual-support) | Claude works in many languages, with strong performance relative to English. |
47| [OpenTelemetry](https://platform.claude.com/docs/en/manage-claude/opentelemetry) | Traces your Messages API requests, tool uses, and Managed Agents sessions with OpenTelemetry spans from the Claude SDK and the Claude API. |
47| [OpenTelemetry](https://platform.claude.com/docs/en/manage-claude/opentelemetry) | Traces your Messages API requests, tool uses, and Managed Agents sessions with OpenTelemetry spans from the Anthropic SDK and the Claude API. |
4848| ↳ [API tracing](https://platform.claude.com/docs/en/manage-claude/opentelemetry/api) | OpenTelemetry spans that the Claude API sends to your observability platform for each model request and tool use that it runs. |
49| ↳ [SDK tracing](https://platform.claude.com/docs/en/manage-claude/opentelemetry/sdk) | OpenTelemetry spans that the Claude SDK emits in your application for each request it sends and each tool that its tool runner runs. |
49| ↳ [SDK tracing](https://platform.claude.com/docs/en/manage-claude/opentelemetry/sdk) | OpenTelemetry spans that the Anthropic SDK emits in your application for each request it sends and each tool that its tool runner runs. |
5050| [Parallel tool use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/parallel-tool-use) | Claude can call several tools in one response. |
5151| [PDF support](https://platform.claude.com/docs/en/build-with-claude/pdf-support) | Send PDFs to Claude so it can read the text, pictures, charts and tables in them. |
5252| [Programmatic tool calling](https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling) | Lets Claude call your tools from code in the code execution container, instead of one model round trip for each call. |
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5656| ↳ [Automatic caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#automatic-caching) | Prompt caching with one top-level `cache_control` field: the cache breakpoint goes on the last cacheable block and moves forward as the conversation grows. |
5757| ↳ [Cache diagnostics](https://platform.claude.com/docs/en/build-with-claude/cache-diagnostics) | Compares a request with your previous one and reports where the prompt prefix changed, to explain cache misses. |
5858| ↳ [Explicit cache breakpoints](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#explicit-cache-breakpoints) | Prompt caching with `cache_control` on individual content blocks, to choose exactly what is cached. |
59| [SDK middleware](https://platform.claude.com/docs/en/cli-sdks-libraries/middleware) | A hook in the Claude SDKs that runs your code before each request is sent and after its response is received. |
59| [SDK middleware](https://platform.claude.com/docs/en/cli-sdks-libraries/middleware) | A hook in the Anthropic SDKs that runs your code before each request is sent and after its response is received. |
6060| [Search results](https://platform.claude.com/docs/en/build-with-claude/search-results) | Content blocks that hold your own search results, with a source and title, so Claude can cite them the same way it cites web search results. |
6161| [Service tiers](https://platform.claude.com/docs/en/api/service-tiers) | Lets a request use your organization’s Priority Tier capacity. |
6262| [Session budgets](https://platform.claude.com/docs/en/managed-agents/budgets) | A hard spending limit in US dollars on one session, measured at public list prices. |
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