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

With no annotations, the description carries the full behavioral burden. It discloses the shape of the response and that the tool is 'free', but says nothing about input size limits, code retention/privacy, or the agent-key billing/auth model (which only appears in the schema). It adds some value but leaves real behavioral questions unanswered.

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 front-loaded sentence that names the tool, the input, and the four output categories. No filler or redundancy; every clause earns its place.

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 the description compensates by enumerating what a review contains. Combined with the schema's handling of auth and idempotency, an agent has nearly everything it needs; only input limits and data-handling expectations are missing.

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 api_key and idempotency_key semantics (auth header precedence, retry safety) are already documented in the schema. The description only loosely maps 'paste any code snippet' onto the generic 'input' param and adds no syntax or format detail. Baseline 3 is appropriate.

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?

States a specific verb+resource ('review' a 'code snippet') and enumerates the output categories (bugs, security issues, performance problems, suggestions), so an agent knows exactly what it gets back. It doesn't need to name a sibling because no other vorn_* tool overlaps with code review, but it also doesn't explicitly differentiate itself.

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?

'Paste any code snippet' implies the usage context, but there is no explicit when-to-use, when-not-to-use, or alternative routing. For a standalone free app the usage is largely self-evident, so a 3 is defensible, but nothing is stated.

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