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What it means

One of three things happened:
  • The tool name in tools/call is not registered on this Aeris workspace.
  • A resource id in the arguments (campaign id, connection id, org id) does not exist — or is not visible to the caller.
  • A range query resolved to zero rows and the tool models empty ranges as a not-found rather than an empty success.
Retrying does not help; the resource has to be created or the identifier corrected.

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How to fix

  • List the tool via tools/list and confirm the exact tool name and visibility.
  • Re-check the id came from the same workspace — cross-workspace ids will look identical but resolve empty.
  • For date-range queries, widen the range or verify the connection has data ingested for that period.

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Response envelope

{
  "ok": false,
  "error_envelope": {
    "code": "NOT_FOUND",
    "message": "Not found.",
    "docs_url": "https://tryaeris.ai/docs/mcp/errors/not-found",
    "retryable": false,
    "retry_after_ms": null,
    "details": {}
  }
}
details is empty by default; a handler may add its own keys for context.
  • INVALID_INPUT — the id was malformed, not merely unknown.
  • CONFLICT — the id resolved, but its state does not allow the operation.