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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered by structured data. The description adds credit-worthy operational context the annotations cannot convey: auth needs ('no API key required', prepaid x-credit-token header) and a rate limit (1 free call/day per tool) plus the $0.03 per-call x402 price on Base. It stops short of describing response shape or failure modes, which keeps it at a 4.

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 hook question is front-loaded and the rest is dense with specific, useful content rather than filler. It is somewhat long and the central question is restated twice, plus 'Not financial advice' and the pricing sentence add bulk, but none of it is misleading or wasted enough to derail the reader.

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?

An output schema exists, so return values need not be explained, and the description still summarizes what comes back (owner powers mapped to enabling attacks, realness of a renounce). Inputs, access/auth, cost, and sibling routing are all covered, leaving nothing an agent needs to call this 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?

There is a single parameter and schema description coverage is 100%, with the schema already documenting address as 'Token contract address'. The description only restates it as 'Required input: address', adding no format, chain, or validation detail beyond the schema. Baseline 3 is appropriate when the schema carries the parameter semantics.

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 a precise verb+resource space: it enumerates the mutable owner powers a token contract retains (raise sell tax, zero balance, blacklist, pause, reclaim ownership, mint) and frames the output as those powers mapped to attack outcomes plus renounce authenticity. It explicitly distinguishes itself from its closest sibling by contrast ('sellability asks can I sell today; this asks what can the owner do AFTER I buy'), so an agent can route between the two without opening either schema.

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?

It names the alternative tool (sellability) and the exact question that selects this one over it, which is the decision an agent actually faces for a token contract address. The post-purchase framing also makes the temporal condition for use explicit.

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