v0.5 — MCP Client Config (Claude Desktop compatible)#40
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…ble) First of two v0.5 MCP-client PRs. Pure-Swift data layer; subprocess pool + chat-side tool-call routing land in part 2. - MCPClientConfig Codable struct mirroring Claude Desktop's ~/.claude_desktop_config.json mcpServers shape (also Cursor's identical schema). Users with existing MCP setups can copy the file across without reformatting. - MCPClientConfigStore actor reads / writes ~/.mac-mlx/mcp.json atomically, creating the parent directory on demand. Missing-file → empty config (no first-run error); malformed JSON → empty config (the bad bytes stay on disk for manual repair). - 7 new unit tests cover Claude Desktop schema decode (with + without env), JSON round-trip, empty config encode/decode, missing-file behaviour, save/load round-trip, parent-dir creation, and malformed-JSON fallthrough. .serialized for tmpdir safety. 133/133 + 7 new = 140 Core tests green (running locally). Subprocess pool (StdioTransport against spawned npx/uvx + connect / listAllTools / callTool) and HummingbirdServer tool-call routing follow in MCP track part 2. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
First of two v0.5 MCP-client PRs. Pure-Swift data layer for connecting macMLX to external MCP servers (mirror of v0.4.0's MCP server role, but reversed: macMLX is the host, chat models tool-call out to other people's MCP servers).
Plan: `docs/superpowers/plans/2026-05-10-v0.5.md` (Track B).
What lands
Test plan
What's deferred to MCP track part 2
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