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

With no annotations, the description must carry the behavioral disclosure burden. It does disclose that the tool is 'rate-limited' and 'no-spend', which are important behavioral traits, and indicates it is a 'preview' rather than an execution. However, it leaves key behaviors unexplained, such as what happens when rate limits are exceeded, whether the operation is read-only, and what 'upgrade metadata' means in practice.

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 a single sentence, which is concise and avoids unnecessary length. However, it is dense with unexplained jargon ('x402', 'upgrade metadata') and does not structure information in a way that quickly communicates the tool's basic function. It earns a middle score for brevity but lacks clarity in structure.

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?

The tool has no output schema and no annotations, so the description must provide essential context. It is too brief to explain what the preview includes, the nature of the upgrade metadata, or the return format. Sibling tools suggest a family of related operations, but the description does not position this tool within that context, leaving significant gaps for the agent.

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 schema description coverage is 50% (only token_address is described). The tool description does not mention any parameters or add meaning to the chain field, which remains undocumented in both the schema and description. For a low-coverage schema, the description fails to compensate by explaining parameter roles or constraints.

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 states it is a 'token-safety preview' with 'no-spend' and 'rate-limited' characteristics, which gives a general sense of functionality. However, it does not clearly define what the tool returns or how it differs from sibling tools like token_safety_check_acp_checkout or token_safety_batch_checkout. The mention of 'paid /token-safety x402 upgrade metadata' is ambiguous and does not clarify the core purpose.

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 explicit guidance is provided on when to use this tool versus alternatives. The phrase 'preview' implies it is for preliminary checks, but there is no mention of when to choose it over the checkout or batch sibling tools. Users are left to infer usage context.

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