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GethosTheWalrus

Temporal MCP Server

cancel_workflow

Cancel a running workflow execution by providing its workflow ID. This stops the workflow immediately.

Instructions

Cancel a running workflow execution

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
workflow_idYesThe workflow execution ID to cancel
Behavior2/5

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

No annotations are provided, so the description must carry the full burden. It only says 'Cancel' without disclosing side effects, reversibility, or authorization requirements. The behavior is minimally implied.

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

Conciseness4/5

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

The description is a single sentence, very concise with no wasted words. However, it could include more context without significant bloat, so not a perfect 5.

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

Completeness3/5

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

With one parameter and no output schema, the tool is simple. The description is adequate but lacks distinction from similar sibling tools like cancel_activity or batch_cancel, and does not mention idempotency or preconditions.

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% with a clear description for workflow_id. The tool description adds no additional meaning beyond the schema, meeting baseline.

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?

The description clearly states the verb 'Cancel' and the resource 'running workflow execution', making the tool's purpose specific and distinguishable from sibling tools like batch_cancel or cancel_activity.

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

Usage Guidelines2/5

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

No guidance on when to use this tool vs alternatives such as batch_cancel, terminate_workflow, or cancel_activity. The description lacks exclusions or context for choosing this over siblings.

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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