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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered without the description. The description contributes nothing beyond that — no mention of what the returned record contains, whether a missing id errors, or any permission requirements, leaving the added behavioral value near zero.

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?

"One webhook" is brief, but brevity here is under-specification rather than conciseness — there is no front-loaded purpose statement or any useful detail to justify the near-absence of content.

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?

The tool is simple (one id parameter, full schema coverage, rich annotations, no output schema), which lowers the bar, but the description still fails to say it is a single-record fetch keyed by id or what happens on invalid ids, leaving an agent with only the name to work from.

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?

A single required 'id' parameter with 100% schema description coverage means the schema fully documents the input, and no parameters baseline is 3. The description adds no syntax, format, or sourcing guidance for the id, so it neither helps nor hurts beyond the schema.

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?

Tautological: description restates name/title.

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?

There is no statement of when to use this versus list_webhooks (to enumerate) or webhooks_update (to modify), nor any prerequisites or exclusions. The agent must infer the selection logic entirely from the tool name.

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