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

The description discloses that this is a premium pay-per-use tool with pricing ([x402: 0.02 USDC on Base]) — a significant behavioral trait beyond the bare name. It also clarifies output scope (bugs, security, improvements). With no annotations at all, the description carries the behavioral burden and does substantial work.

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?

One compact sentence with scannable pricing info. It's structurally fine, but the Spanish/Portuguese parameter description ('código') and the mixed-language preamble 'PREMIUM' and x402 syntax add minor noise. Still overall compact.

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?

For a one-parameter tool with no output schema, the description provides enough to call it: input is code, output is review, pricing is disclosed. It doesn't say what format the output comes back in, what language constraints apply, or the max input size, but those are likely obvious from the tool's nature.

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 coverage is 100%; the single parameter 'input' is documented as 'código' in the schema. The description adds 'input=code' which reinforces the same information. Baseline 3 is appropriate since the schema already fully covers the parameter, and the description contributes redundancy rather than new 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 clearly states 'code review (bugs, security, improvements)' and the input is code. It's a specific verb-resource pair that distinguishes it from siblings like code-gen, explain, proofread, etc.

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?

The description says 'For devs/companies' and 'input=code' which implies when to use it — when you have code to review. It doesn't explicitly exclude alternatives among the many siblings, but the code-review purpose is relatively clear given the sibling list.

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