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

Annotations already cover the safety profile (read-only, idempotent, non-destructive), and the description adds what they cannot: it is a paid call ($0.10, half for holders), requires an x402 payment passed via `payment`, only accepts public HTTPS targets, and returns per-check status plus an exact curl reproduction. The holder-discount eligibility rules and the 'ask for terms, then pay' flow are also 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?

The opening usage clause is well front-loaded, but the second sentence is a long comma-spliced inventory of checks that is hard to scan. Pricing and holder rules repeated from the title/schema description add length without new decision-relevant information.

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?

With no output schema, the description usefully says what the response contains (per-check pass/warn/fail/unavailable plus a reproducing curl), and for a 3-parameter tool with full schema coverage and annotations, that is nearly enough to call it correctly. A note on latency or the cost of running the full battery is the main remaining gap.

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 100%, so the schema already documents url, payment, and holderWallet in detail; the description only restates the payment passing convention and the holderWallet/holder mapping. It adds marginal meaning beyond the schema, which is the expected baseline-3 outcome 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?

The description enumerates concretely what the report covers: MCP initialize and tools/list, the x402 402 challenge and Bazaar metadata, OpenAPI/llms.txt, agent-card and mcp.json, plus pass/warn/fail status with a reproducing curl. That is a specific, inspectable resource, though the verb ('run checks and report') is implied by the enumeration rather than stated outright. It distinguishes itself from buildcheck_sample but not from overlapping siblings like x402_seller_check or watchtower_check.

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 when an agent or its builder needs to know if a public agent service works for other agents' gives a clear triggering condition, and 'HTTPS public URLs only' plus 'Free first: buildcheck_sample' supply a hard boundary and an explicit alternative. It stops short of explaining when to choose this over the other overlapping check tools (watchtower_check, x402_seller_check) or why the paid version beats the free sample.

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