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The following features are available for deployments hosted on Anthropic but are not supported for deployments hosted on Azure: -* Structured outputs -* Server-side tools (web search, web fetch, code execution, and tool search) -* MCP connector -* Agent Skills -* Programmatic tool calling -* Files API +* [Code execution](https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool) +* [Web search](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool) and [web fetch](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool) tool versions later than `web_search_20250305` and `web_fetch_20250910`. Deployments hosted on Azure support only these basic versions, so dynamic filtering, response inclusion, and cache bypass are not available. +* [Agent Skills](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview) +* [Programmatic tool calling](https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling) +* [Files API](https://platform.claude.com/docs/en/build-with-claude/files) Requests that use these features against a deployment hosted on Azure return a `400 Bad Request` error by design. Claude Code detects deployments hosted on Azure and automatically adapts its feature set.
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| [PDF support](https://platform.claude.com/docs/en/build-with-claude/pdf-support) | Process and analyze text and visual content from PDF documents. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | | [Search results](https://platform.claude.com/docs/en/build-with-claude/search-results) | Enable natural citations for RAG applications by providing search results with proper source attribution. Achieve web search-quality citations for custom knowledge bases and tools. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | | [Server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) | Retry a refused request inside a single API call. Use the `"default"` mode to apply Anthropic's recommended fallback models, or name up to three models of your own; when the requested model declines, the API runs the next model in the chain on the same request. The `fallbacks` parameter is not available in the Message Batches API. | Not ZDR eligible\* | <PlatformAvailability claudeApiBeta /> | -| [Structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) | Guarantee schema conformance with two approaches: JSON outputs for structured data responses, and strict tool use for validated tool inputs. | [ZDR eligible (qualified)](https://platform.claude.com/docs/en/build-with-claude/structured-outputs#data-retention)\* | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi />† | +| [Structured outputs](https://platform.claude.com/docs/en/build-with-claude/structured-outputs) | Guarantee schema conformance with two approaches: JSON outputs for structured data responses, and strict tool use for validated tool inputs. | [ZDR eligible (qualified)](https://platform.claude.com/docs/en/build-with-claude/structured-outputs#data-retention)\* | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | | [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) | Enhanced reasoning capabilities for complex tasks, providing transparency into Claude's step-by-step thought process before delivering its final answer. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | ## Tools
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### Server-side tools -| Feature | Description | ZDR | Availability | -| --------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- | ---------------------------------------------------------------------- | -| [Advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) | Pair a faster executor model with a higher-intelligence advisor model that provides strategic guidance mid-generation for long-horizon agentic workloads. | ZDR eligible | <PlatformAvailability claudeApiBeta claudePlatformAwsBeta /> | -| [Code execution](https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool) | Run code in a sandboxed environment for advanced data analysis, calculations, and file processing. Free when used with web search or web fetch. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws azureAi />† | -| [Web fetch](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool) | Retrieve full content from specified web pages and PDF documents for in-depth analysis. | ZDR eligible\* | <PlatformAvailability claudeApi claudePlatformAws azureAi />† | -| [Web search](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool) | Augment Claude's comprehensive knowledge with current, real-world data from across the web. | ZDR eligible\* | <PlatformAvailability claudeApi claudePlatformAws vertexAi azureAi />† | +| Feature | Description | ZDR | Availability | +| --------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- | --------------------------------------------------------------------- | +| [Advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) | Pair a faster executor model with a higher-intelligence advisor model that provides strategic guidance mid-generation for long-horizon agentic workloads. | ZDR eligible | <PlatformAvailability claudeApiBeta claudePlatformAwsBeta /> | +| [Code execution](https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool) | Run code in a sandboxed environment for advanced data analysis, calculations, and file processing. Free when used with web search or web fetch. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws azureAi />† | +| [Web fetch](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool) | Retrieve full content from specified web pages and PDF documents for in-depth analysis. | ZDR eligible\* | <PlatformAvailability claudeApi claudePlatformAws azureAi /> | +| [Web search](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool) | Augment Claude's comprehensive knowledge with current, real-world data from across the web. | ZDR eligible\* | <PlatformAvailability claudeApi claudePlatformAws vertexAi azureAi /> | ### Client-side tools
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Infrastructure that supports discovering, orchestrating, and scaling tool use. -| Feature | Description | ZDR | Availability | -| ------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- | ------------------------------------------------------------------------------ | -| [Agent Skills](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview) | Extend Claude's capabilities with Skills. Use pre-built Skills (PowerPoint, Excel, Word, PDF) or create custom Skills with instructions and scripts. Skills use progressive disclosure to efficiently manage context. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAwsBeta azureAiBeta />† | -| [Fine-grained tool streaming](https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming) | Stream tool use parameters without buffering/JSON validation, reducing latency for receiving large parameters. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | -| [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector) | Connect to remote [MCP](https://platform.claude.com/docs/en/mcp) servers directly from the Messages API without a separate MCP client. | Not ZDR eligible | <PlatformAvailability claudeApiBeta claudePlatformAwsBeta azureAiBeta />† | -| [Programmatic tool calling](https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling) | Enable Claude to call your tools programmatically from within code execution containers, reducing latency and token consumption for multi-tool workflows. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws azureAi />† | -| [Tool search](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool) | Scale to thousands of tools by dynamically discovering and loading tools on-demand using regex- and BM25-based search, optimizing context usage and improving tool selection accuracy. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi />† | +| Feature | Description | ZDR | Availability | +| ------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- | ----------------------------------------------------------------------------- | +| [Agent Skills](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview) | Extend Claude's capabilities with Skills. Use pre-built Skills (PowerPoint, Excel, Word, PDF) or create custom Skills with instructions and scripts. Skills use progressive disclosure to efficiently manage context. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAwsBeta azureAiBeta />† | +| [Fine-grained tool streaming](https://platform.claude.com/docs/en/agents-and-tools/tool-use/fine-grained-tool-streaming) | Stream tool use parameters without buffering/JSON validation, reducing latency for receiving large parameters. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | +| [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector) | Connect to remote [MCP](https://platform.claude.com/docs/en/mcp) servers directly from the Messages API without a separate MCP client. | Not ZDR eligible | <PlatformAvailability claudeApiBeta claudePlatformAwsBeta azureAiBeta /> | +| [Programmatic tool calling](https://platform.claude.com/docs/en/agents-and-tools/tool-use/programmatic-tool-calling) | Enable Claude to call your tools programmatically from within code execution containers, reducing latency and token consumption for multi-tool workflows. | Not ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws azureAi />† | +| [Tool search](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool) | Scale to thousands of tools by dynamically discovering and loading tools on-demand using regex- and BM25-based search, optimizing context usage and improving tool selection accuracy. | ZDR eligible | <PlatformAvailability claudeApi claudePlatformAws bedrock vertexAi azureAi /> | ## Context management
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## Compatibility - [ZDR](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention): eligible (excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements)) - Supported models: `claude-fable-5`, `claude-mythos-5`, `claude-mythos-preview`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonnet-5`, `claude-sonnet-4-6`, `claude-sonnet-4-5-20250929`, `claude-opus-4-5-20251101`, `claude-haiku-4-5-20251001` -- Platforms: Claude API, Claude Platform on AWS, Amazon Bedrock [1], Google Cloud, Microsoft Foundry [2] +- Platforms: Claude API, Claude Platform on AWS, Amazon Bedrock [1], Google Cloud, Microsoft Foundry 1. On Amazon Bedrock, structured outputs are available for Claude Opus 4.6, Claude Sonnet 4.6, Claude Sonnet 4.5, Claude Opus 4.5, and Claude Haiku 4.5. -2. On [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), structured outputs require a [Hosted on Anthropic deployment](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure). Structured outputs constrain Claude's responses to follow a specific schema, ensuring valid, parseable output for downstream processing. Structured outputs provide two complementary features:
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To call web search directly, without dynamic filtering, set `allowed_callers: ["direct"]`. Models that don't support programmatic tool calling require this setting. Without it, the API returns a 400 error that tells you to set it. <Note> - The web search tool (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, web search requires a [Hosted on Anthropic deployment](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure). On Google Cloud, only the basic web search tool (without dynamic filtering) is available. Web search is not available on Amazon Bedrock. + The web search tool (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, deployments [hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) support only the basic web search tool (`web_search_20250305`, without dynamic filtering). Deployments hosted on Anthropic support all versions. On Google Cloud, only the basic web search tool (without dynamic filtering) is available. Web search is not available on Amazon Bedrock. </Note> The following examples use `web_search_20260318`:
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The latest web fetch tool version (`web_fetch_20260318`) supports **dynamic filtering** with Claude Fable 5, Claude Opus 4.8, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6. Claude can write and execute code to filter fetched content before it reaches the context window, keeping only relevant information and discarding the rest. This reduces token consumption while maintaining response quality. `web_fetch_20260318` also adds [response inclusion](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#response-inclusion) control for agentic workflows. The previous versions (`web_fetch_20260309` for dynamic filtering and [cache bypass](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#cache-bypass), `web_fetch_20260209` for dynamic filtering only, `web_fetch_20250910` for basic fetch) remain available. -Web fetch (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, web fetch requires a [Hosted on Anthropic deployment](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure). It is not currently available on Amazon Bedrock or Google Cloud. +Web fetch (with and without dynamic filtering) is available on the Claude API, [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), and [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry). On Microsoft Foundry, deployments [hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) support only the basic web fetch tool (`web_fetch_20250910`, without dynamic filtering). Deployments hosted on Anthropic support all versions. Web fetch is not currently available on Amazon Bedrock or Google Cloud. <Note> For [Claude Mythos Preview](https://anthropic.com/glasswing), web fetch is available on the Claude API and Microsoft Foundry. It is not currently available for Mythos Preview on Amazon Bedrock or Google Cloud.
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- Status: Beta - [Beta header](https://platform.claude.com/docs/en/api/beta-headers): `mcp-client-2025-11-20` - [ZDR](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention): not eligible -- Platforms: Claude API (beta), Claude Platform on AWS (beta), Microsoft Foundry (beta) [1]; not available on Amazon Bedrock, Google Cloud -1. On [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), the MCP connector requires a [Hosted on Anthropic deployment](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure). +- Platforms: Claude API (beta), Claude Platform on AWS (beta), Microsoft Foundry (beta); not available on Amazon Bedrock, Google Cloud Claude's Model Context Protocol (MCP) connector feature enables you to connect to remote MCP servers directly from the Messages API without a separate MCP client.