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

Annotations already cover read-only, idempotent, non-destructive, and closed-world, so the safety profile is handled. The description adds genuinely new behavior: no x402 challenge, no payment required, free to call directly, and an equivalent HTTP endpoint — useful agent-facing operational context.

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 leading clause front-loads the content inventory well, but the trailing payment note is redundant — 'no payment required', 'call directly without payment', 'no x402 challenge', and 'this tool is free' all restate the same fact, and the HTTP URL is boilerplate for a tool the agent is already calling.

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 parameters and no output schema, the description carries the burden of explaining what comes back, and it does so thoroughly via the content inventory. The one gap is the response format (markdown text vs. structured JSON), which the agent must still discover by calling.

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?

The tool takes zero parameters, which is the baseline-4 case; nothing needs explaining in the description and none is attempted.

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 concrete resource with enumerated contents: the seven scored checks, present_and_consistent/misshaped/absent rules, keyword and claim-phrase lists, MCP spec defaults, and scoring. It is unambiguously the reference document rather than the audit itself, which separates it from manifest_audit, though it never names the sibling tools that apply these criteria (manifest_precheck, manifest_drift_criteria).

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 an explicit pre-condition: 'Read these before paying for an audit — every audit is reproducible from them,' which tells the agent to consult this before invoking the paid audit. No exclusions or guidance on when to skip it, but the intended sequence is clear.

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