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

Beyond the annotations, the description adds meaningful behavioral context: results come from a dated snapshot, records do not establish compatibility, authenticity, or successful testing, and the tool does not install anything. These caveats are exactly the kind of context an agent needs before relying on lookup results.

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 compact and well-ordered: purpose first, then usage guidance, then return contents, then caveats. Every sentence adds distinct value, and there is no redundant restatement of the title or schema.

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 lookup with one required parameter and no output schema, the description is complete: it states what the tool returns, how to narrow the query, what the data represents, and what the tool does not do. Nothing needed for correct invocation 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?

With schema description coverage at only 33%, the description compensates by revealing the role of each parameter family: model_id is the exact lookup key, while board_platform and version are optional narrowers. It does not explain the enum meanings, but the schema already enumerates those values.

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 uses a specific verb ('Find') and resource ('records in a dated snapshot of the public vnish.global firmware catalog'), which clearly identifies what the tool does. It also states the tool does not download or install firmware, removing ambiguity and differentiating it from broader firmware-management actions.

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 gives clear invocation guidance: use the exact model ID and narrow by board code and version if known. It also states a key limitation ('Does not download or install firmware'), which helps an agent avoid using it for installation, but it does not explicitly name sibling alternatives or exclusion conditions.

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