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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful detail about what is returned (metadata plus paragraphs) and that the extraction runs against the anonymous HTML response, which hints at what is available to an unauthenticated client. It says nothing about failure modes (paywalled/404/non-article URLs), which would have raised this score.

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 sentence, zero padding, with the resource and the scoping constraint front-loaded. Nothing is repeated from the schema or annotations.

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 one-parameter, read-only tool with an output schema, the description covers purpose, scope, and roughly what is returned, so nothing essential is missing. The only real gap is that neither the description nor the schema tells the agent what a valid canonical article URL looks like.

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?

The single url parameter has 0% schema description coverage, so the description must carry the burden, and it does add one meaningful constraint: the URL must be a canonical article URL. However, it gives no format or example (e.g. path shape), leaving the agent to infer what 'canonical' means.

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 names a specific verb ('Extract'), a specific resource ('metadata and the paragraphs'), and a precise scope ('one canonical Denver Post article URL'), which cleanly separates it from sibling listing tools like denverpost_headlines, denverpost_news, and denverpost_sections. An agent can identify this as the single-article retrieval tool without inspecting the 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?

'For one canonical Denver Post article URL' implies the usage context (single-article fetch, not listing), but there is no explicit when-to-use statement, no guidance on where such URLs come from, and no mention of alternatives such as denverpost_headlines for discovery. Usage is inferred rather than stated.

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