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

Annotations already state readOnlyHint=false, openWorldHint=true, idempotentHint=false, destructiveHint=false, and the description adds genuinely new context: this is a two-phase operation with an early-exit guard, plus a concrete per-call cost of $0.02 USDC via x402. That cost and the abort path are exactly the kind of runtime facts annotations cannot express. It stops short of saying what a published badge looks like, how it is 'queryable', or whether a repeat call publishes a duplicate badge (relevant given idempotentHint=false).

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?

Three short sentences, front-loaded with the primary action and its consequence, with pricing isolated in a parenthetical. Nothing is wasted, though the abort clause reads as a fragment rather than fully integrated with the lookup step.

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 paid, non-idempotent, two-step mutation with no output schema, the description covers the action, the failure path, and the price, which is a reasonable minimum. What is missing is anything about the publish step's effect: is a badge persisted or minted, who can query it, and what does a caller receive back. Given the cost and the unmet hints about idempotency and open-world behavior, an agent still cannot predict the outcome of a successful call.

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 baseline 3 applies. However, the single parameter is documented only as 'Task/query text for this SKU', which is generic boilerplate and does not make clear that the agent's identifier must be embedded in free text; the description does not compensate for that ambiguity. This is a case where the coverage metric overstates how much meaning the schema actually conveys.

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?

Names a concrete composite action: look up an agent's track record, then publish it as a queryable trust badge. That is more specific than the sibling names reputation.lookup or agent.trust-badge alone, since the description makes clear this tool bundles both steps. It never names those siblings, so the agent must infer the differentiation from the name prefix 'bundle.'

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?

'Stops if the agent is not found' is a precondition on execution, not guidance about when to pick this tool over the many adjacent options (reputation.lookup, agent.trust-badge, bundle.seal-and-badge, bundle.due-diligence). No when-to-use or when-not-to-use statement is given, and no prerequisites about payment setup beyond the price quote.

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