not a developer.
what happens if this schema validation fails here - what will the mcp server respond with and what will the llm do next (in a deterministic sense)?
llm tool call -> mcp client validates the schema -> mcp client calls the tool -> mcp server validates the schema
They often do fail, at the client level you can just feed the schema validation error message back into the LLM and it corrects itself most of the time.
If not the LLM throws itself into a loop until its caller times it out and it sends an error message back to the user.
At the server level it's just a good old JSON API at this point, and the server would send the usual error message it would send out to anyone.
Not advice with some time to fix any possible problem, just blocked.
We gave very bad image to our clients and users, and had to give explanations of a false positive from google detection.
The culprit, according to google search console, was a double redirect on our web email domain (/ -> inbox -> login).
After just moving the webmail to another domain, removing one of the redirections just in case, and asking politely 4 times to be unblocked.. took about 12 hours. And no real recourse, feedback or anything about when its gonna be solved. And no responsibility.
The worse is the feeling of not in control of your own business, and depending on a third party which is not related at all with us, which made a huge mistake, to let out clients use our platform.