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

The annotations already indicate a non-read-only but non-destructive operation, and the description adds the important behavioral fact that the call deducts prepaid credits from a reusable key. It does not clarify whether credits are charged per domain, per request, or on failure, nor does it mention rate limits or idempotency.

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 description is two tight sentences with no filler. The primary purpose is front-loaded, followed immediately by the important credit-deduction side effect.

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 three-parameter paid query tool with no output schema, the description gives the core task and cost behavior. It falls short on explaining the since time window and the structure of returned technology changes, which an agent would need to use the tool with confidence.

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 only 33%, with creditKey described in the schema. The description compensates partially by indicating that domains are comma-separated and that the key is reusable, but it never explains the since parameter, leaving one parameter opaque.

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 the resource as technology additions and removals and scopes it to comma-separated domains, so the general purpose is inferable. However, it uses a noun phrase rather than a clear action verb like 'returns' or 'detects', and it does not distinguish this paid x402 variant from the sibling change-api.

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?

There is no explicit guidance on when to use this tool versus alternatives such as change-api or when to supply the since parameter. The mention of deducting prepaid credits implies a paid-key prerequisite, but the description leaves the agent to infer when this variant is appropriate.

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