directory_price_check

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

No annotations are supplied, so the description carries the full disclosure burden. It does useful work by marking the call as free, explaining that results come from the directory's own live probing of each endpoint rather than a fresh check triggered by this call, and enumerating the possible verdicts (HONEST / OVERCHARGE / UNDERCHARGE / NO_PAYMENT_WALL / UNREACHABLE). It says nothing about result staleness or refresh cadence, response shape, rate limits, or failure behavior, which are significant gaps for an unannotated 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?

Purpose and the free/no-cost signal are front-loaded, then mechanism, then the two modes, then the verdict enum, then a program link. Nearly every sentence carries information, though "The directory probes every listed endpoint live and compares..." is explanatory background rather than actionable detail, and the trailing URL is marginally useful.

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-optional-parameter lookup with no annotations and no output schema, the description covers what is returned (verdict values enumerated), the scope switch (all vs single slug), the source and semantics of the data (live probe of quoted vs advertised price), and the cost (free). Nothing essential to calling 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?

Schema coverage is 0% — the single slug parameter is just an undescribed string with a null default — so the description must compensate, and it does: it explains the two modes and the effect of supplying or omitting slug. It also gives the closed set of verdict values a caller will encounter. It does not clarify the slug format or where to obtain a valid slug (presumably from agentpaystore_directory), leaving a small gap.

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 resource (Price Honesty Badge verdicts for listings in the AgentPay Directory) and a specific operation (return the latest verdict, either for all services or one), plus the exact comparison being reported: quoted x402 price vs advertised listing price. That is far beyond a restatement of the name. It never names a sibling such as check_x402_endpoint or get_listing_proof to disambiguate a self-serve probe from this precomputed verdict lookup, so it stops short of a 5.

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 gives explicit conditional guidance: no slug returns verdicts for every listed service, a slug returns that one service's verdict. That resolves the only real invocation decision. It offers no when-not guidance or alternatives (e.g., use check_x402_endpoint to probe a single endpoint yourself), which keeps it below a 5.

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