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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the bar is lower, and the description still adds real value: it discloses the replacement behavior (existing endpoint is overwritten), that the signing secret is returned only once and is not retrievable later, and that a project API key is required. It stops short of describing failure modes or validation behavior.

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 what is being configured, followed by mutation semantics, return value, and auth requirement. No filler and every clause carries information.

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 single-parameter mutation with no output schema, the description covers the destructive replacement, the one-time secret return, and the auth requirement, which is what an agent most needs before calling. Minor gaps remain around payload expectations and error behavior, but nothing critical is missing.

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?

With one parameter at 0% schema description coverage, the description supplies the only semantic constraint: the endpoint must be HTTPS, which is stricter than the schema's generic format:uri. The url parameter's purpose is otherwise self-evident from the resource description, so little more is needed.

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?

States a specific verb ('configures') and resource ('one HTTPS endpoint for completed handoffs in this project'), scoping it to a single endpoint. That scope plus the get_webhook/delete_webhook siblings makes the distinction clear without opening any schema.

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?

The description implies this is the way to set or change the endpoint (because it 'replaces any active endpoint'), but it never says when to prefer get_webhook or delete_webhook, nor states prerequisites such as having a prepared form or registered agent. Usage is inferable rather than stated.

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