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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely new context beyond that: the return value is a signing secret and must be handled like a password, which is exactly the handling constraint an agent needs for a credential-returning read.

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?

Two short sentences with no filler; the purpose is front-loaded and the handling warning follows immediately. Nothing would be gained by trimming or reordering.

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 read tool with annotations present and no output schema, the description covers what is returned and how to treat it. It omits where the endpoint ID comes from and whether re-reading after a rotation is needed, leaving modest gaps.

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?

Only one parameter exists and the schema documents nothing about it (0% coverage). The description implies the argument identifies 'a webhook endpoint' but adds no format, source (e.g., list_webhook_endpoints), or validation detail beyond that implication.

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 ('Read') and resource ('the secret a webhook endpoint's events are signed with') plus the downstream purpose (verifying events). This is clearly distinct from get_webhook_endpoint and rotate_webhook_endpoint_secret, though it never names those siblings to make the contrast explicit.

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 phrase 'for the user's app to verify them' implies a use case but gives no explicit when/when-not guidance, no direction to rotate_webhook_endpoint_secret instead when the secret must change, and no prerequisites such as required scopes or ownership of the endpoint.

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