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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 23 Oct 2026
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self-hosted-sandboxes-custom-tools changedmanaged-agents/self-hosted-sandboxes-custom-tools

Nearest release: v2.1.309, published 7 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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208208The SDK's [Client-side MCP helpers](https://platform.claude.com/docs/en/agents-and-tools/mcp-connector#client-side-mcp-helpers) convert the server's tools into the runnable tools the worker accepts. Install an MCP SDK alongside the Anthropic SDK: `pip install "anthropic[mcp]" "mcp>=1.24"` (typescript: `npm install @modelcontextprotocol/sdk`; go: `go get github.com/modelcontextprotocol/go-sdk`; csharp: `dotnet add package ModelContextProtocol`; java: `com.anthropic:anthropic-java-mcp`; php: `composer require mcp/sdk`; ruby: `bundle add mcp faraday event_stream_parser`).
209209 
210The examples connect without authentication. To send credentials, configure the `http_client` (typescript: `requestInit`; go: `HTTPClient`; csharp: `AdditionalHeaders`; java: `customizeRequest`; php, ruby: `headers`) you hand to the MCP transport.
210The examples connect without authentication. To send credentials, configure the `http_client` (typescript: `requestInit`; go: `HTTPClient`; csharp: `AdditionalHeaders`; java: `.customizeRequest()`; php, ruby: `headers`) you hand to the MCP transport.
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212212### Declare and serve the tools
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586586 </Step>
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588588 <Step title="Serve the tools from the worker">
589 Connect to the same MCP server at startup, convert its tools with `async_mcp_tool` (typescript: `mcpTools`; go: `mcp.NewBetaTools`), and register them alongside `beta_agent_toolset_20260401` (typescript: `betaAgentToolset20260401`; go: `agenttoolset.BetaAgentToolset20260401`). Keep one MCP session open for the life of the worker.
589 Connect to the same MCP server at startup, convert its tools with `async_mcp_tool()` (typescript: `mcpTools()`; go: `mcp.NewBetaTools()`), and register them alongside `beta_agent_toolset_20260401()` (typescript: `betaAgentToolset20260401()`; go: `agenttoolset.BetaAgentToolset20260401()`). Keep one MCP session open for the life of the worker.
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591591 <CodeGroup exclude="shell, csharp, java, php, ruby">
592592 ```python Python
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