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Find the message or symptom you are seeing below and open it for the fix. Most problems come down to the key, a client that has not reloaded its config, or sending requests too fast.
The request had no valid x-api-key header and no OAuth sign-in. Every tool, including market data, needs one or the other. Either you forgot the header, or the key is wrong. Re-copy it from the External AI page and make sure the value starts with open_. No key yet? Please make an account at openfinance.tech to get your keys.
Most clients only read the MCP config on startup. Fully quit and relaunch the app, or use the client’s “Reload MCP servers” command.
Run npx skills list to confirm the install location. If installed globally, restart your editor. If installed to a project, make sure you opened that project root.
You hit the rate limit, which is per key. Slow your agent down, then retry.

Still stuck?

If none of these match, look up the tool you are calling in the MCP server overview, which covers every tool the server offers.