Native Mac Agent Builder Integrates MCP for Claude, GPT, and Local Models
ahumanbeingmars · reddit · 2026-08-05
A developer added MCP (Model Context Protocol) tool support to a native Mac agent builder.
Implementation Details:
- Wrote a stdio JSON-RPC client from scratch, wiring tool discovery into the agent node.
- Mapped calls onto each provider's native tool-calling format, allowing the same MCP server to work seamlessly with Claude, GPT, or local models via Ollama.
Gotchas:
- GUI apps inherit a bare PATH, so npx-based servers fail to launch until explicitly extended.
- Avoid splitting streams with AsyncLineSequence; it breaks on U+2028/U+2029 and corrupts JSON payloads containing them.
Currently stdio only, tool results are size-capped, and the loop is bounded at 8 rounds. MIT licensed.
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