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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered structurally. The description adds value by disclosing exactly what is inspected (bytecode presence, nonce liveness, USDC balance), which is real behavioral context beyond the annotations. It does not, however, mention the x402 payment gate that changes whether a full or partial payload is returned, nor any rate limits or failure modes for non-contract addresses.

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 sentence with zero filler, front-loaded on the verb and resource, with the three audit dimensions listed compactly at the end. Every clause carries information and nothing is repeated from the schema or annotations.

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, the description usefully enumerates the three return dimensions, which is the main thing an agent needs to judge relevance. Combined with complete annotation coverage of safety semantics and full schema coverage of parameters, the definition is close to self-sufficient. The notable gap is silence on the x402 payment gate and what a partial versus full payload looks like.

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 description coverage is 100%, so both the address pattern/format and the optional x402_payment signature are already documented in the schema, establishing the baseline of 3. The description adds only the implicit notion that 'any' valid address is acceptable and never mentions the payment parameter or what it unlocks. No meaning is added beyond the structured field.

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 (audit) plus a precise resource (Base Mainnet eip155:8453 smart contract or relayer wallet) and enumerates the three checks: deployed bytecode, nonce liveness, and Base USDC balance. That is far more specific than the tool name alone. It stops short of a 5 only because it makes no explicit statement distinguishing it from the listed siblings, though those siblings cover unrelated domains (domains, bounties, transcripts, catalogs).

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 implied by the scope phrase 'any Base Mainnet ... smart contract or relayer wallet,' which tells an agent the tool applies to both contract addresses and relayer wallets on one specific chain. There is no explicit when-to-use/when-not guidance, no prerequisites, and no named alternative to route to. Adequate but leaves the agent to infer the triggering context.

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