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

With no annotations, the description must carry the full burden. It discloses that every result has files addressed by SHA-256 and lists the returned fields, but it does not mention pagination, permissions, or other side effects. Some behavioral context is present, but it is not comprehensive.

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 three concise sentences with no filler. It front-loads the purpose and then adds relevant return details. It is appropriately sized for a tool with 7 optional parameters.

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?

Given the tool has 7 optional parameters and no output schema, the description explains the return fields and the SHA-256 addressing, which is helpful. However, it omits pagination behavior and does not clarify the result structure (e.g., array vs single object), leaving minor gaps for an agent invoking it correctly.

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 71%, so most parameters already have descriptions. The description itself adds no parameter-specific meaning—it only lists return fields. The uncovered parameters (sort, limit) are self-explanatory from their enums/defaults, so the schema does the heavy lifting and the description does not compensate further.

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 states 'Find open models in the hub's index' with a specific verb and resource, and adds the SHA-256 detail. It is unambiguous, but it does not explicitly contrast with sibling tools get_model or resolve_file, so it lacks explicit differentiation.

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 description implies this is the tool for searching models, but it does not specify when to use it instead of get_model or resolve_file, nor does it provide exclusions or conditions. Guidance is only implicit.

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