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

With no annotations, the description carries the full burden and does disclose a genuinely non-obvious trait: the x402 per-call payment model, a $0.02–$0.1 USDC cost range tied to network answer availability, and cache-sharing economics including producer credits. It is silent on what the 'bounded action verdict' actually contains, failure modes, and any auth/latency behavior, so the operational picture is incomplete.

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 core capability is front-loaded in the first sentence, which is good structure. The payment and shared-cache sentences are dense but partly promotional, and some of that detail could be trimmed without losing decision-relevant information.

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?

There is no output schema and no annotations, so the description is the only source of return-shape information – yet 'bounded action verdict' is never defined in terms of possible outcomes. It lists what is inspected (executable code, proxy signals, pause signals) but leaves the agent unsure how to interpret or act on the result.

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?

One parameter with full schema description coverage, so the schema already explains that it is a Base contract address matching a hex pattern. The description adds nothing beyond the schema here; baseline 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 uses a specific verb and resource: checks whether an address is executable code, detects proxy and pause signals, and returns a bounded action verdict. That is far more than a restatement of the name. It does not, however, distinguish itself from close siblings like contract_change, contract_interface, or transaction_intent_guard, so an agent gets no routing help.

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 framing question 'Is this Base contract safe to interact with?', which suggests calling it before interacting with an unknown contract. There is no explicit when-to-use, when-not-to-use, or named alternative among the many contract-oriented siblings, so the agent must infer the trigger.

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