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

No annotations, so the description carries the full burden. It does disclose a genuine behavioral trait the schema can't: cost ($0.01 x402), subscription inclusion, and billing parity with HTTP. However it says nothing about whether the call mutates state, whether verdicts are cached, or what happens on an unknown approval_id — critical 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?

A single compact sentence with no filler, and billing context is parenthetical rather than front-loaded. Brevity here shades into under-specification rather than efficiency.

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 and no annotations, so the description should explain the return value and side effects; it explains neither. Pricing is covered, but an agent cannot confidently call this correctly or interpret the result.

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 required parameter at 0% schema description coverage. The description only echoes the placeholder {approval_id} without stating its format, where it comes from, or how to obtain one. It does not compensate for the coverage 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?

"Per-approval verdict {approval_id}" names a resource but supplies no verb — an agent cannot tell whether this fetches, computes, records, or casts a verdict. Against siblings like emit_record and weekly_report it is not distinguishable in operation type. It largely restates the tool name plus a parameter placeholder.

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, when-not-to-use, or alternative is mentioned. Nothing tells the agent how this relates to emit_record, subscribe, or account, even though they plausibly overlap in a workflow.

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