HoldKit for ChatGPT

ai.peerfoundry/holdkit

Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.

client:ChatGPT transport:streamable-http tools:14

Install HoldKit in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://holdkit.peerfoundry.ai/mcp

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