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by dominikamann
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

Cancel a meeting you created

cancel_event
Destructive

Cancel a meeting created with create_event; attendees receive a cancellation that removes it from their calendars. This action is irreversible—use update_event to move a meeting instead.

Instructions

Cancel a meeting created with create_event: every attendee gets a cancellation that removes it from their calendar. This cannot be undone; to move a meeting use update_event instead. Returns the event with status cancelled.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "id": "<id>"
    },
    "name": "cancel_event"
  }
}

Input Schema

NameRequiredDescriptionDefault
idYesEvent id from create_event or list_events

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.3.2
    • addedInput schema / properties / id / description
      Added value: +"Event id from create_event or list_events"
  2. First observedv0.1.0

TDQS

A4.7/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already flag destructiveHint=true, idempotentHint=false and openWorldHint=true, but the description adds genuinely new facts: attendees receive a cancellation and lose the event from their calendars, the action is irreversible, and the return is the event with status cancelled. That is real side-effect disclosure beyond the structured fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short sentences, front-loaded with the core action, then the consequence, then the alternative. No filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a one-parameter mutation with full annotation coverage and no output schema, the description supplies the missing pieces an agent needs: irreversibility, attendee impact, and the returned status. Nothing material is absent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and the single id parameter is already documented as coming from create_event or list_events. The description adds no format or sourcing detail beyond the schema, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb (cancel) plus resource (meeting) and the provenance constraint (created with create_event). It is unmistakably distinct from siblings like update_event and delete_message.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly routes the agent: use this to cancel, use update_event instead to move a meeting. The when-not condition is stated rather than inferred.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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