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

Annotations already declare readOnly, idempotent, non-destructive and openWorld=false, so the safety profile is fully covered. The description adds a genuinely useful auth fact ('Needs no key') and a return-content sketch, but the closing sentence 'Quote the read time when you state a line' is cryptic and does not clearly disclose a behavior.

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 short sentences, front-loaded with the resource and content types. The final sentence is compact but ambiguous in meaning, so it earns less than full marks despite the brevity.

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, return values need no explanation, and annotations cover the safety profile. The description still supplies the auth note and the content-type envelope, which is nearly everything an agent needs to call it; only the unstated failure behavior for a bad id is missing.

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 coverage is 100% for the single 'id' parameter, and the schema already documents that it comes from search. The description adds only that this id addresses 'one search result', which is marginal value over the schema. Baseline 3 is appropriate.

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 the resource precisely: the full text of one search result, enumerating the shapes it can take (player lines/graded results, league summary, guide, answer). That is enough to separate it from the sibling 'search' tool, which produces the list this one expands, though it never names that sibling explicitly.

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?

Usage is implied rather than stated: the schema says the id comes 'from search', so an agent can infer the search-then-fetch flow. There is no explicit when-not guidance or statement of what happens with an invalid or stale id.

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