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

No annotations are provided, so the description carries the full burden. It does disclose one non-obvious behavior — '(counts as 1 call)' — which is genuinely useful quota information, but it is silent on partial-failure semantics (what if 3 of 10 URLs fail?), auth requirements, and error behavior.

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 tight sentences with the core capability front-loaded and the quota note as a compact parenthetical. Only the second sentence is slightly vague filler, but nothing is redundant.

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 one-parameter tool with no output schema and no annotations, the description covers the what and the batching limit but leaves the return shape and failure behavior unexplained. Adequate to invoke correctly, thin for interpreting results.

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 0%, so the description must compensate. It usefully states the batch size limit ('up to 10 URLs'), which parallels the schema's maxItems, but gives no format guidance for the url strings themselves (scheme, single vs. array semantics on error).

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 names a specific verb+resource ('Run check_agent_access on up to 10 URLs at once'), so the agent knows this is a batch wrapper over the sibling check_agent_access rather than an independent operation. The 'up to 10 URLs' scope cleanly separates it from the single-URL sibling, though it never says what an access check actually returns.

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?

'Use it to pick which sources an agent can actually use' gives a use context, but only implicitly. It never states when to prefer this over calling check_agent_access directly, nor any exclusion conditions or prerequisites.

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