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

Annotations give only generic hints (readOnlyHint=false, openWorldHint=true, idempotentHint=false), so the description's disclosure of a $1.00 USDC charge on Base per call is genuinely additive and explains why the call is not free/read-only. It still omits payment mechanics and what happens if the license lookup fails (refund or not) — material for a paid call.

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 sentences, zero filler, and the core action is front-loaded ahead of the cost note. Every clause earns its place.

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?

The description covers the operation, the assessed fields, and the cost, but with no output schema it never hints at the shape or reliability of the returned assessment (statuses, missing-field behavior), and it omits how the USDC payment is authorized. Adequate but with real gaps for a paid, single-purpose tool.

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?

Single parameter with 100% schema description coverage and a pattern constraint, so the schema fully documents it. The description adds nothing beyond that, which is the correct baseline when the schema does the work.

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?

Specific verb+resource: it fetches CSLB public detail and assesses the C-10 classification, bond, and workers comp fields. An agent can distinguish it from the sibling 'list_contractor_check_prices' (which lists prices rather than performing the check), though the description never explicitly names that sibling.

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 when-to-use or when-not-to-use guidance; the only routing information is implied by the verb 'check' versus the sibling's 'list'. The $1.00 cost is disclosed but not framed as a decision criterion (e.g., 'use the price tool first to confirm cost').

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