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

Annotations already establish the tool as a read-only, idempotent, non-destructive operation, so safety is covered. The description adds behavior the annotations don't: what each id prefix returns (compact members for a category ranking vs. the full app record) and that the payload lands in a 'text' field as JSON. It omits error behavior for invalid ids and any sizing or truncation cues for large records.

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?

The description is two short sentences with no filler, and the retrieval outcome is front-loaded in the first clause. The phrasing is compressed, though: 'One document by the id search returned' is slightly awkward and requires a second read.

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 single-parameter tool with no output schema, the description covers the essentials: where the id comes from, what each id form returns, and which field holds the JSON. It falls short of full completeness only because the shape of the returned record is left to discovery and failure modes are unaddressed.

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% and the single 'id' parameter is already documented with its two accepted prefixes. The description nonetheless adds semantics beyond the schema, explaining what the agent actually receives for each prefix. That pushes it above the baseline of 3, though it doesn't cover an invalid-id case.

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 states a specific verb and resource: fetch one document (a category ranking or an app record) using the id that search returned. It goes further than the title by explaining that 'list:<slug>' yields a category ranking with compact members and 'app:<slug>' yields the app's full record. It doesn't distinguish itself from the get_app / get_category siblings, which appear to retrieve similar objects by other keys.

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?

The phrase 'the id search returned' implies the intended workflow: call this after search, using the returned ids. But it never states when to prefer this tool over get_app, get_category, or search_apps, nor what to do when the id is malformed or from a different source.

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