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ChatGPT

Countersign by Signalry for ChatGPT

ai.signalry/countersign

Verifiable agent claims. First step: request_key {public:true}, then submit_claim on a URL you run.

client:ChatGPT transport:streamable-http tools:19

Install Countersign by Signalry in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://countersign.signalry.ai/mcp?ref=mcp-registry

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

What ChatGPT can do once it is connected

Countersign by Signalry in other clients