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

Annotations already indicate read-only and open-world behavior. The description adds useful behavioral context by specifying exactly what will be returned: schemas, pricing, networks, seller details, and all recorded observations. This is consistent with the annotations and adds value beyond them.

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 a single, front-loaded sentence that immediately states the scope ('Full detail for one capability') followed by a compact, informative list. There is no filler, repetition, or unnecessary prose.

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 simple read-only get-by-id tool, the description explains the return content well enough, and the annotations cover safety. It could be more complete by explicitly linking the id parameter to the capability being fetched, but the overall definition is sufficient for an agent to select and invoke the tool.

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 schema has one required parameter, id, with 0% description coverage, yet the description never mentions the id parameter or how to supply it. The pattern in the schema provides format information, but the description itself adds no parameter semantics; the connection to 'one capability' is only indirect.

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 clearly identifies the action: retrieve full detail for one capability, and enumerates the included content areas (schemas, pricing, networks, seller, observations). It implicitly distinguishes itself from search_capabilities by emphasizing a single entity, but it does not explicitly contrast with any sibling.

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 intended usage is implied: use this tool when you need comprehensive information about a specific capability, presumably after identifying it through a search. No explicit when-to-use or when-not-to-use guidance is given, and no alternatives are named.

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