1,116 pages for message.

console Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/console …server to a Managed Agent session. To call the same servers from the Messages API instead, see [Use the tunneled MCP servers](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/overview… Edit docker-compose.yaml: increment the integer in the setup service's Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/deploy-compose …servers"> Attach an upstream MCP server to a Managed Agent or the Messages API. </Card> <Card title="Security" icon="lock" href="https://platform.claude.com/docs/en/agents-and-tools/mcp-tunne… deploy-helm Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/deploy-helm …/<route>.<your-tunnel-domain>/<path>` in a Managed Agent session or a Messages API request, where `<route>` is a key from `gateway.config.routes` and `<path>` is whatever the upstream MCP server serve… overview Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/overview …to a Managed Agent session in the Claude Console, or pass them to the Messages API through the [MCP connector](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector). ## Prerequisites B… security Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/security …t use them, and stop passing their URLs in the `mcp_servers` block of Messages API requests. </Step> <Step title="Archive the tunnel"> Archiving invalidates the tunnel token and detaches the… troubleshooting Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/troubleshooting …stream. | Verify through a [Managed Agent or the Messages API](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/overview#use-the-tunneled-mcp-servers) instead. |… advisor-tool Claude Developer Platform · in the page agents-and-tools/tool-use/advisor-tool …Note> <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "anthropic-beta: advisor-tool-… bash-tool Claude Developer Platform · in the page agents-and-tools/tool-use/bash-tool …start <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "content-type: application/json" \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-0… browser-use-sdk Claude Developer Platform · in the page agents-and-tools/tool-use/browser-use-sdk …opic() with ExampleBrowser() as browser: runner = client.beta.messages.tool_runner( model="claude-opus-5-5", max_tokens=1024, tools=[browser], messages=… browser-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/browser-use-tool …browser_toolset_20260801`, with no `name`, to the `tools` array of a [Messages API](https://platform.claude.com/docs/en/api/messages/create) request. <CodeGroup> ```bash cURL curl https://api.ant… build-a-tool-using-agent Claude Developer Platform · in the page agents-and-tools/tool-use/build-a-tool-using-agent …le turn The smallest possible tool-using program: one tool, one user message, one tool call, one result. The code is heavily commented so you can map each line to the [tool use lifecycle](https://pla… code-execution-tool Claude Developer Platform · in the page agents-and-tools/tool-use/code-execution-tool …result with a non-zero `return_code` and a `detection_timeout` status message in its output. This is separate from the `execution_time_exceeded` [error code](https://platform.claude.com/docs/en/agents… computer-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/computer-use-tool …Quick start Add the computer use toolset to the `tools` array of a [Messages API](https://platform.claude.com/docs/en/api/messages/create) request as `{"type": "computer_toolset_20260801"}`. The req… define-tools Claude Developer Platform · in the page agents-and-tools/tool-use/define-tools …x names with the service (for example, `github_list_prs`, `slack_send_message`). This makes tool selection unambiguous as your library grows, and is especially important when using [tool search](https… fine-grained-tool-streaming Claude Developer Platform · in the page agents-and-tools/tool-use/fine-grained-tool-streaming …a block of code, and the fragments arrive through the same [Streaming messages](https://platform.claude.com/docs/en/build-with-claude/streaming) events as standard tool use. <Warning> Because the A… handle-tool-calls Claude Developer Platform · in the page agents-and-tools/tool-use/handle-tool-calls …g in the tool `input`. 3. Continue the conversation by sending a new message with the `role` of `user`, and a `content` block containing the `tool_result` type and the following information: * `t… how-tool-use-works Claude Developer Platform · in the page agents-and-tools/tool-use/how-tool-use-works …stop_reason`: 1. Send a request with your `tools` array and the user message. 2. Claude responds with `stop_reason: "tool_use"` and one or more `tool_use` blocks. 3. Run each tool. Format the outputs… memory-tool Claude Developer Platform · in the page agents-and-tools/tool-use/memory-tool …usage <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "content-type: application/jso… overview Claude Developer Platform · in the page agents-and-tools/tool-use/overview …you: <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "content-type: application/jso… parallel-tool-use Claude Developer Platform · in the page agents-and-tools/tool-use/parallel-tool-use …se description: Enable, format, and disable parallel tool calls, with message-history guidance and troubleshooting. --- By default, Claude may call multiple tools in a single response. This page cove… Process results programmatically Claude Developer Platform · in the page agents-and-tools/tool-use/programmatic-tool-calling …ld)): <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "content-type: application/jso… server-tools Claude Developer Platform · in the page agents-and-tools/tool-use/server-tools …turn by re-sending the request with the assistant content appended to messages. curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-… strict-tool-use Claude Developer Platform · in the page agents-and-tools/tool-use/strict-tool-use …start <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "content-type: application/json" \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-0… text-editor-tool Claude Developer Platform · in the page agents-and-tools/tool-use/text-editor-tool …editor tool (named `str_replace_based_edit_tool`) to Claude using the Messages API. You can optionally specify a `max_characters` parameter to control truncation when viewing large files. <Note> `… tool-reference Claude Developer Platform · in the page agents-and-tools/tool-use/tool-reference …(which accepts only `["direct"]`) are optional. Client toolsets are Messages API tools. They aren't currently available as agent tools in [Claude Managed Agents](https://platform.claude.com/docs/en/… Log at info level Claude Developer Platform · in the page agents-and-tools/tool-use/tool-runner …mber """ return str(a + b) runner = client.beta.messages.tool_runner( model="claude-opus-5-5", max_tokens=1024, tools=[get_weather, calculate_sum],… tool-search-tool Claude Developer Platform · in the page agents-and-tools/tool-use/tool-search-tool …ntically to the Claude API. Claude Platform on AWS uses the Anthropic Messages API directly, so there is no InvokeModel or Converse distinction. </Note> ## Model compatibility Both tool search varia… tool-use-with-prompt-caching Claude Developer Platform · in the page agents-and-tools/tool-use/tool-use-with-prompt-caching …ur cache The cache follows a prefix hierarchy (`tools` → `system` → `messages`), so a change at one level invalidates that level and everything after it: | Change | Inv… troubleshooting-tool-use Claude Developer Platform · in the page agents-and-tools/tool-use/troubleshooting-tool-use …- | | Claude calls tools sequentially when parallel would be better | Message history formatting | Send multiple `tool_result` blocks in ONE user message, not one per turn. See [Parallel tool us… web-fetch-tool Claude Developer Platform · in the page agents-and-tools/tool-use/web-fetch-tool …URLs that have previously appeared in the conversation: URLs in user messages, URLs in client-side tool results, and URLs from previous web search or web fetch results (see [URL validation](https://p… web-search-tool Claude Developer Platform · in the page agents-and-tools/tool-use/web-search-tool …318`: <CodeGroup> ```bash cURL curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "content-type: application/jso… Beta Claude Developer Platform · in the page api/beta …a ## Domain types ### Anthropic Beta - `AnthropicBeta = string or "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 49 more` - `string` - `"message-b… beta-headers Claude Developer Platform · in the page api/beta-headers …e the `anthropic-beta` header in your API requests: ```http POST /v1/messages Authorization: Bearer YOUR_API_KEY anthropic-version: 2023-06-01 anthropic-beta: BETA_FEATURE_NAME content-type: applicat… Agents Claude Developer Platform · in the page api/beta/agents …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Archive Agent Claude Developer Platform · in the page api/beta/agents/archive …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Create Agent Claude Developer Platform · in the page api/beta/agents/create …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… List Agents Claude Developer Platform · in the page api/beta/agents/list …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Get Agent Claude Developer Platform · in the page api/beta/agents/retrieve …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Update Agent Claude Developer Platform · in the page api/beta/agents/update …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Versions Claude Developer Platform · in the page api/beta/agents/versions …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… List Agent Versions Claude Developer Platform · in the page api/beta/agents/versions/list …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Deployment Runs Claude Developer Platform · in the page api/beta/deployment_runs …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… List Deployment Runs Claude Developer Platform · in the page api/beta/deployment_runs/list …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Get Deployment Run Claude Developer Platform · in the page api/beta/deployment_runs/retrieve …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Deployments Claude Developer Platform · in the page api/beta/deployments …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Archive Deployment Claude Developer Platform · in the page api/beta/deployments/archive …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Create Deployment Claude Developer Platform · in the page api/beta/deployments/create …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… List Deployments Claude Developer Platform · in the page api/beta/deployments/list …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Pause Deployment Claude Developer Platform · in the page api/beta/deployments/pause …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`… Get Deployment Claude Developer Platform · in the page api/beta/deployments/retrieve …send `managed-agents-2026-04-01` in this header. - `string` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"`…