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

Annotations already cover read-only, idempotent, non-destructive, and closed-world behavior, so the bar is lower. The description still adds real context beyond them: the call is subscription/credential-gated, and the returned copy is verbatim from the email ('word for word as in the email'), which tells the agent the content is exact and pre-packaged rather than generated.

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 sentences, front-loaded with the audience and the source of the content, then a compact enumeration of the return payload. The opening fragment ('OperStack Watch subscribers, with their key.') is slightly clipped, but there is no filler.

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?

With no output schema, the description carries the burden of explaining what returns, and it does so by listing the payload fields. Auth prerequisites are stated and the single param is covered by the schema, leaving only sibling differentiation as a gap.

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?

There is one optional parameter with 100% schema description coverage, so the schema already explains 'site'. The description never mentions it, so it adds no meaning on top of the structured field — the baseline of 3 applies.

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 description identifies a specific resource — the fix of the week from the last Watch email — and enumerates its contents (buyer question it answers, who ChatGPT named instead, the change, the site copy). It is clear what comes back, but it never distinguishes this from adjacent siblings like who_instead or what_changed, and the verb is implied rather than stated.

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?

It states a prerequisite audience and auth requirement ('OperStack Watch subscribers, with their key'), which implies when the tool is valid. However, it gives no guidance on when to use this versus the many sibling tools listed, so usage remains inferred rather than directed.

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