feat: bidirectional MCP bridge + tool composer (S20)#394
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Phase 3 sprint S20 — issues #167, #168. - @agentskit/tools/mcp (subpath): bidirectional Model Context Protocol bridge. createMcpClient + toolsFromMcpClient consume MCP servers as native ToolDefinitions. createMcpServer exposes AgentsKit tools to MCP hosts. Transports: createStdioTransport (newline-JSON on stdin/stdout), createInMemoryTransportPair for tests. Protocol subset: initialize + tools/list + tools/call over JSON-RPC 2.0. - @agentskit/core/compose-tool (subpath): composeTool chains N ToolDefinitions into one macro tool. mapArgs builds next sub-call from state, mapResult transforms, stopWhen short-circuits, finalize reduces. One schema visible to the model, fixed recipe underneath. 23 new tests. Core bundle still 8.7 KB / 9.7 KB gzipped.
This was referenced Apr 19, 2026
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Summary
Phase 3 sprint S20 — closes #167, #168.
23 new tests.
Coverage
Docs
Changeset
`.changeset/phase3-s20-mcp-composer.md` — minor bumps on `@agentskit/tools`, `@agentskit/core`.
Test plan