Hermes Agent's MCP server has changed the tool list, but no new tools can be seen in the conversation. Please reload or restart the corresponding MCP service first, and do not uninstall and reinstall it immediately. Many MCP tools are registered at startup, and the configuration may not automatically enter the current session.
Check first to see if the service has issued a change
If the MCP server supports a change notification in tools, the client may be able to detect the update; if it is not supported, Hermes will still see the old schema. The performance is that you obviously changed the configuration, added tools, and deleted tools, but the model still acts according to the old tool list.
The troubleshooting order is: confirm that the MCP server process is running, check the startup log, confirm that environment variables and credentials are not lost, and then reload the tool list. Reinstallation is required only if the server fails to start, has a wrong path, or is missing dependencies.
Don't treat schema issues as model issues
After the tool name, parameters, and description are changed, the model needs to see the new schema before it can be called correctly. If the old schema is still there, it may pass the wrong parameters, or it may not even know that the new capabilities exist. It is generally useless to change models at this time, so you should refresh the tool registration first.
It is recommended to make a minimum acceptance for each MCP configuration change: list the current tool, call a read-only tool, confirm the return value, and then write to the class. Testing read-only first and then testing write-in can avoid directly changing production data as soon as new tools are launched.
If you still can't see the new tool after reload, check whether the launch command points to the old package, old configuration file, or old working directory. Especially for boot methods such as Docker, npx, and uvx, caching and PATH can easily make you think that the configuration has been changed and the actual boot is still an old version.
