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A failed tool call returns an error the agent can read, describing what went wrong. There are four kinds worth knowing.
A not-found error is returned for both missing and inaccessible events on purpose, so you never learn whether another organization’s event exists. Don’t treat it as proof that an id is invalid — only that it isn’t readable by you.Every rejected write means nothing was written, so it is always safe to correct the call and retry without first checking what partially landed.

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Visibility, not just errors

Tools act as you. An agent reaches exactly the events your Nowadays account can open, so a tool returning fewer events than you expect is usually permissions, not a bug — enterprise events are private to their creator and their approvers by default.

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Rate limits

Requests are rate limited per user, across every MCP client you have connected. Limits are approximate and enforced on a best-effort basis. Exceeding the limit returns a rate-limit error. Back off and retry, increasing the delay on repeated failures, and spread bulk work out rather than firing many calls at once. If you have a legitimate need for a higher limit, contact us — limits may be raised on request.