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

Annotations only state non-read-only, non-destructive, non-idempotent, and closed-world. The description adds two facts annotations cannot: the signing secret is returned exactly once (an irreversible, capture-it-now consequence) and creation does not invoke the URL. That is meaningful behavioral context beyond structured fields, though it omits auth requirements and error conditions.

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

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

Three short sentences, front-loaded with the action and the one-time secret warning. No filler; the only redundancy is the opening 'Create a tool.' restating the name.

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

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

For a mutation tool with no output schema, the one-time signing secret disclosure is the key missing-elsewhere detail and it is present. However, it does not say what else is returned (ID), whether the secret is required later, or what failures look like, leaving gaps against a nested-object create operation.

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

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

Schema description coverage is 100% with nested field descriptions for url, name, and description, so the schema does the parameter work. The tool description adds no field-level semantics (e.g., timeout_ms bounds or method behavior), leaving this at the baseline 3.

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

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

The verb+resource is stated, but 'Create a tool' mostly restates the tool name, and a 'tool' is never positively defined (an HTTP callback registered for assistant use?). The claim that attached tools call the URL during conversations hints at the resource, yet an agent can't easily tell this apart from sibling create_webhook from the text alone.

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

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

No guidance on when to use this versus update_tool, list_tools, or create_webhook. The 'configuring a tool does not invoke its URL' sentence describes runtime behavior, not tool selection, so there is effectively no when-to-use/when-not guidance.

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