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 usefully discloses cost ($0.02 USDC on Base per call) and a source cap of 3, which are real behavioral facts. But it omits payment/auth mechanics, what the result looks like (verdict vs citations), and failure behavior, leaving significant gaps for a mutation/paid tool.

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 sentences, front-loaded with the core capability, then the cost. Nothing is wasted and the key constraints are easy to scan.

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 an 11-parameter, paid, unannotated tool with no output schema, this description is far too thin. It doesn't explain the interaction between the fixed 3-source cap and the source-control parameters, nor what an agent receives back or what payment/preconditions apply.

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 only 18% across 11 parameters, so the description must compensate but does not. It only gestures at source count ('up to 3 cited sources'), and that conflicts with the schema's maxSources (max 20)/minimumSources fields, while asOf, jurisdiction, sourcePolicy, allowedDomains, blockedDomains, freshnessHours, language, and includeConflicts get no explanation at all.

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 and resource ('verify a claim') plus the distinguishing trait 'quick' and 'narrow claim'. However, it never explicitly names the siblings (verify_claim, verify_claim_deep, verify_claim_research) or the threshold that separates quick from deep/research, so differentiation is left to inference from the name.

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?

'Quick' and 'narrow claim' imply the intended use case, but there is no explicit when-to-use versus verify_claim_deep/research, no guidance on when the 3-source cap is insufficient, and no prerequisites (payment, wallet). Usage is implied only.

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