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

Annotations already declare readOnlyHint=true, idempotentHint=true and openWorldHint=false, so safety and repeatability are covered. The description adds the content shape (Markdown plus metadata fields), which is modest value but overlaps the existing output schema rather than disclosing behavior like failure modes when only one page cannot be retrieved.

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 tight sentences, front-loaded with what is returned; the second sentence carries the only invocation detail. No filler or repetition.

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 an output schema present the description need not enumerate return fields, and annotations cover the safety profile; parameters are fully documented. The remaining gap is the absence of any statement about supplying neither id nor url, since zero parameters are required.

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 100%, and the schema itself states 'An alternative to id; pass either one.' The description merely restates that id or url comes from a search result, adding only the provenance of the id, so baseline 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?

States a specific verb (returns) and resource (the full content of one page) plus the exact return payload — Markdown text with title, description, language and last-modified date. The sibling 'search' is only implicitly contrasted via 'of a search result', so differentiation is inferable rather than stated outright.

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?

'Pass the id (or url) of a search result' implies the tool is used downstream of search, which gives usable context. However, there is no explicit when-to-use/when-not guidance, no statement that exactly one of id or url is required, and no mention of error behavior when neither is supplied.

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