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

With no annotations, the description carries the full burden and mostly doesn't. The 50-item cap is a genuinely useful disclosed constraint, but there is nothing on whether 'PRO' gating requires a paid token, how invalid or malformed licences are reported, or whether partial failures abort the batch.

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?

Two short, front-loaded fragments with no filler. The unexplained 'PRO.' token borders on cryptic rather than informative, but the size is well matched to the tool.

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?

No output schema and no annotations, so the description must convey results and failure modes — it says nothing about what 'current validity' returns per licence. For a batch tool where partial results are the norm, this leaves the agent guessing.

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 50%: access_token is documented in-schema while licences is not. The description does compensate for that gap by establishing that licences is a list of licence numbers capped at 50, but adds no format, normalization, or duplicate-handling detail.

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?

States a specific verb (Check), resource (licence numbers), and the checked property (current validity), plus a batch bound of 50. This implicitly separates it from the single-record sibling licence_detail, though that separation is never made explicit.

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?

No statement of when to choose this over licence_detail or the device_search tools, and no prerequisites beyond the opaque 'PRO.' prefix. The only routing signal is the 50-licence batch framing, which the agent must infer.

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