ChatGPT crosscheck skillcheck_lookup
How to: ChatGPT crosscheck skillcheck_lookup
Add crosscheck to ChatGPT
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01
Open Settings → Connectors → Advanced → Developer mode and merge this in. Keep any servers already there.
https://crosscheckapi.com/mcp-
02
Save the file and restart ChatGPT.
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03
Ask for something skillcheck_lookup does. ChatGPT lists the server's tools on connect and calls skillcheck_lookup itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that crosscheck's identifier in your config matches the one above exactly.
Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs
Set these first
crosscheck will not start until these are set, so skillcheck_lookup never becomes available.
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CROSSCHECK_WALLET_KEY -
CROSSCHECK_MAX_USD -
CROSSCHECK_NETWORKS
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 25 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.