vk_put_kind_a908298e0dac

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

With no annotations, the description carries the full burden of behavioral disclosure. It usefully notes that authentication is required and that the tool does nothing if the reaction already exists (idempotency). However, it does not mention response format, error behavior, or any side effects beyond the mutation. The claim that the body is 'optional' contradicts the schema requirement, which is a minor transparency issue.

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 description repeats 'Add a reaction to an entity.' verbatim as the first and third sentences, which is redundant waste. The remaining information is useful but could be condensed into a tighter paragraph. Wasteful repetition prevents a higher score.

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 simple proxy tool with three parameters and no output schema, the description is fairly complete. It covers purpose, idempotency, authentication, and how to pass parameters. Minor gaps include absence of error scenarios and the optional-body inconsistency, but the core usage is well specified.

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%, so the schema already documents all three parameters. The description adds value by clarifying how to pass parameters (body payload, top-level fields, camelCase/snake_case aliases), but it incorrectly labels the body as optional when the schema marks it required. This mixed contribution keeps the score at baseline.

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 the tool adds a reaction to an entity and provides the exact REST endpoint (PUT /{kind}/{id}/reactions). This is a specific verb+resource that distinguishes it from the many sibling tools, especially those with generic 'kind' names.

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 gives clear usage context: it explains that the JSON request payload goes in the body field, path/query parameters are top-level, and parameter aliases are accepted. It does not explicitly mention alternatives, but the purpose is specific enough that 'when to use' is unambiguous. No exclusions are stated.

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