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. Beyond that the description adds nothing: it does not mention pagination (despite a 'page' parameter), what happens with an invalid or expired digest_id, or whether jobs are ordered or truncated. For a zero-coverage schema this is a thin disclosure.

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?

It is short, but the brevity comes from under-specification rather than discipline — a single fragment with no front-loaded verb or scope statement. There is no sentence structure to speak of.

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 has two undocumented parameters, no output schema, and only minimal annotations, so the description is the sole place meaning can be supplied — and it supplies almost none. An agent cannot confidently determine what digest_id refers to or how paging behaves.

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 0%, so the description must carry parameter meaning and does not. 'One past alert email' weakly implies digest_id identifies a single digest, but the 'page' parameter is never explained and neither parameter's type or source is clarified.

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 is a noun fragment ('The jobs in one past alert email') with no verb, so it largely restates the title 'Get past alert' rather than stating an action. It does add the one useful idea that the result is a set of jobs belonging to a single past alert email, but an agent still has to infer that this is a retrieval operation.

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 is given about when to use this tool versus past_alerts, list_alerts, new_jobs, or get_job. In particular, it never says that past_alerts is where the digest_id comes from, which is the one piece of routing context that would matter most.

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