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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely new traits: the analysis excerpt is truncated to roughly 1,200 characters, links are only present when the library has them, and the content is written in the poem's own language. It does not say what is returned when no analysis exists, which is the main remaining ambiguity.

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?

A single sentence with no filler; the truncation limit is parenthetically front-loaded where it matters. The trailing 'with links ... when the library has them' clause is slightly tangled but still readable.

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 return-value burden and does so: summary, opening of analysis, page links, and language. The only real gap is the behavior on a poem with no stored analysis, which the 'when the library has them' hedge leaves ambiguous.

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 a single required parameter whose schema description already covers format and pattern (24 hex characters) at 100% coverage. The description adds nothing about the id beyond what the schema states, so 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 names the resource (a poem's summary and the opening of its analysis) and the returned payload (links to summary/analysis pages), so it is more than a restatement of the name. It stops short of explicitly contrasting itself with get_poem, so an agent must infer that this returns derived commentary rather than the poem text.

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?

'when the library has them' is a conditional about availability, not about when to choose this tool over get_poem or find_poems. The use case (wanting a summary/analysis instead of the full text) is implied but never stated, and no exclusions are given.

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