429 Too Many Requests response. The rate limit resets after a certain period, which is specified in the Retry-After header. MCP clients surface this as a failed tool call, and the assistant can retry it once the wait has passed.
The MCP rate limit is separate from the REST API’s rate limit. The two are counted independently, so MCP usage does not consume REST API quota and the other way round.
If you need a higher rate limit, please contact your Quartr representative to discuss options for increasing your limits based on your use case and subscription plan.