Add mcp-client module: ChatClient calling tools from real external MCP servers over stdio

defaultToolCallbacks(ToolCallbackProvider) wires two real stdio MCP servers (the official filesystem server and git server) into ChatClient, contrasted with defaultTools(Object) for a local @Tool method. Every call -- MCP-sourced or local -- is logged through one Micrometer ObservationHandler<ToolCallingObservationContext>; a first version wired that handler two ways at once and every call logged twice, which is now a regression test. No real LLM is used anywhere: every test builds an AssistantMessage.ToolCall by hand and drives it through the real ToolCallingManager bean against real npx/uvx-launched MCP server processes. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FtpJvZfg4nvLvtzgJTDWpB
2026-09-23 14:44:10 +00:00
parent 9919da58a7
commit 60849f4319
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+# Calling the filesystem MCP server's read_text_file tool through the real ToolCallingManager
+
+tool: read_text_file
+arguments: {"path":"/home/claude/work/spring-ai-clone/mcp-client/fixtures/workspace/notes.txt"}
+
+response: [{"text":"hello from the sandbox workspace\n"}]