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

With no annotations, the description carries the full burden and does so richly: server-side fetch, deterministic checks with 'No LLM is queried per call', the $1.50 USDC x402 payment flow, and the fact that no API key is needed. Auth/payment requirements, cost, and computation model are all disclosed.

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?

Front-loaded with purpose and output, then the check taxonomy. Dense but nearly every clause earns its place by telling the agent what is inspected; the parenthetical taxonomy is long, which slightly dilutes scannability.

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 exists, so the description must explain return values — and it does: 0-100 score, A-F grade, per-check pass/partial/fail/unknown with evidence, top 3 fixes. Combined with cost/payment details, nothing needed to invoke it correctly is missing.

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?

One parameter with 100% schema coverage, so the schema already documents 'url'. The description adds only the framing 'brand/storefront URL', which matches the schema description rather than extending it. Baseline 3 applies when the schema does the heavy lifting.

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 precise verb+resource+scope: 'Full GEO (AI-search visibility) readiness audit of a brand/storefront URL.' The word 'Full' plus the enumerated 20-check breakdown implicitly separates it from the sibling audit_geo_lite, so an agent can tell them apart without opening either schema.

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?

Gives concrete when-to-use cases ('audit a client's site for AI-search visibility', 'generate the audit behind a GEO report'). It never explicitly names when-not-to-use or routes the agent to audit_geo_lite, leaving the full-vs-lite decision to be inferred from the '20 weighted checks' detail.

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