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

With no annotations supplied, the description carries the burden and does well: it discloses that the check is a live RPC call, enumerates the outputs (risk score, verdict), and crucially warns that this is a paid x402 endpoint at $0.02 USDC with a specific GET URL. It omits failure modes (rate limits, retries, what happens on an EOA vs contract, how a low score maps to caution/avoid thresholds).

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?

A single dense, front-loaded sentence lists the checks first and the payment/logistics parenthetical last, which is the right ordering. It is packed but each clause names a distinct check or a distinct cost fact, so little is wasted; a light bullet structure would read better.

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?

With no output schema and no annotations, the description must convey return values, and it does enumerate the diagnostic fields plus the aggregate risk score and verdict. It is slightly incomplete on error behavior and on the cost implications of repeated calls, which matter for an agent deciding whether to retry.

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?

Only one parameter exists and the schema already documents it at 100% coverage ('Base Mainnet 0x contract or wallet address'). The description reinforces the Base Mainnet chain constraint but adds no new format, checksum, or validation semantics beyond the schema, so the baseline of 3 applies.

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 names a specific verb+resource ('contract & escrow solvency check') and enumerates exactly what is examined: bytecode size, Circle USDC balance, EIP-1967/1167 proxy detection, pause/blacklist selector scan, risk score and verdict. That enumeration alone distinguishes it from siblings like token_rug_scan or wallet_forensics, which target different networks/asset classes.

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?

Usage is only implied: it's a due-diligence check on a Base Mainnet contract, and the mention of an escrow focus plus a numeric verdict hints at a pre-interaction safety gate. There is no explicit when-to-use vs when-not, and no routing guidance against the sibling tools (e.g. when to prefer token_rug_scan or wallet_forensics).

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