Agent Toolbox for ChatGPT

io.github.johngee518/agenttoolbox

Free, no-key MCP server: token estimates, JSON Schema conversion, MCP configs, tool search.

client:ChatGPT transport:streamable-http tools:4

Install Agent Toolbox in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://agenttoolbox.net/api/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs