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create-webhook-subscription

Create a webhook subscription to receive POST requests when workouts are created. Your endpoint must respond with 200 OK within 5 seconds.

Instructions

Create a new webhook subscription for this account. The webhook will receive POST requests when workouts are created. Your endpoint must respond with 200 OK within 5 seconds.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesThe webhook URL that will receive POST requests when workouts are created
authTokenNoOptional auth token that will be sent as Authorization header in webhook requests
Behavior3/5

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

Without annotations, the description carries the burden. It discloses that the webhook sends POST requests and expects a fast response. However, it doesn't mention mutation behavior, idempotency, or error handling, which are useful for a creation tool.

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?

Two sentences, no redundant information. Every sentence adds value: first states the action and purpose, second adds behavioral detail and requirement. Highly efficient.

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

Completeness4/5

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

Given the tool's simplicity (2 parameters, no output schema), the description covers the essential aspects: creation, triggering event, and endpoint requirement. It lacks details on idempotency or response format but is generally complete for a basic creation tool.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3. The description adds value by noting that authToken is sent as an Authorization header, which is not in the schema description. This extra detail helps the agent understand parameter usage.

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 tool creates a new webhook subscription and explains it will receive POST requests when workouts are created. This distinguishes it from sibling tools like delete-webhook-subscription and other create tools.

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

Usage Guidelines4/5

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

The description provides clear context: use this to get notified when workouts are created. It also specifies a key requirement (endpoint must respond within 5 seconds). It doesn't explicitly exclude use cases, but the purpose is narrowly defined.

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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