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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered structurally. The description does add genuinely new behavior beyond that: the 404/no_template failure mode, the 'Free' cost signal, and the shape of the returned payload — useful, but thin on what the template's rules and bounds actually govern.

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?

One dense sentence-sentence pair with zero filler, and the resource plus returned fields are front-loaded. The telegraphic style ('404 no_template. Free.') is efficient but occasionally reads as fragments rather than 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?

With only one required parameter, no output schema, and annotations covering safety, the definition supplies the missing pieces an agent needs: the returned fields, the 404 no_template error, the cost, and the companion tool that constructs the call.

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 description coverage is 100% and listing_id is documented in-schema as a UUID, so the schema does the heavy lifting. The description adds nothing about the parameter (e.g., where a listing_id comes from, as with search_listings) — baseline 3 for full schema coverage.

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?

Names the concrete resource (a listing's verification template) and enumerates what comes back (output_schema, rules and bounds, template_url), which is far more than the title alone. It is distinguishable from build_template and prepare_verification by framing itself as the fetch step, though the verb itself is only implied ('A listing's ... template') rather than stated.

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?

It positions itself in a workflow by pointing at prepare_verification as the tool that builds the call, and ties the result to the 'Agent Output Verifier'. That is implied usage rather than explicit when-to-use / when-not guidance, and it never states why an agent would call this directly instead of build_template.

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