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

Annotations already indicate idempotentHint=true and readOnlyHint=false; the description complements this by emphasizing that only stage metadata should be reported and that sensitive values must never be included. This adds data-handling context, but it does not disclose other behavioral traits such as side effects, failure modes, or whether external telemetry is transmitted.

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?

Two sentences, minimal filler, and the core action appears in the second sentence right after a concise scoping phrase. It loses a point because the first sentence is a noun phrase rather than a direct action statement, slightly reducing 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?

This is a 7-parameter telemetry tool with no output schema, no parameter descriptions, and minimal behavioral disclosure. The description is enough to understand the high-level intent but not enough to know expected return values, error handling, or how to fill several fields correctly.

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?

With 0% schema description coverage, the description must compensate, but it only names what not to send and refers generically to 'stage metadata.' It does not explain handoff_id, stage, error_code, signer_kind, client_timestamp, signer_available, or sdk beyond what their property names and enums already imply.

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 identifies a specific action ('Report ... telemetry') and a specific resource ('local buyer authorization path'), which lets an agent distinguish it from handoff and preflight siblings. It falls just short of a 5 because it does not explicitly contrast with any sibling or say what makes it 'cooperative' in operational terms.

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?

The phrase 'for the local buyer authorization path' gives useful context about when this telemetry call belongs. However, it does not state exclusions, prerequisites, or mention alternatives, leaving the agent to infer when to use this tool versus other x402-related siblings.

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