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

With no annotations, the description carries the full burden. It discloses that the operation is free, grows a shared trust graph, requires authentication, defines the rating scale (0..1), and specifies the return shape ({id, verified}). Minor gaps remain, such as idempotency or reversibility, but overall it provides good behavioral context beyond the schema.

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 is concise and well-structured: a one-sentence purpose, a rating note, an auth instruction, a concrete example, and a return type. Every sentence adds value with no fluff, and the example effectively demonstrates parameter usage.

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?

Given 5 parameters, 0% schema coverage, no annotations, and an output schema, the description covers most essentials: purpose, rating semantics, authentication, an example, and return shape. The only notable omission is task_id, and edge cases/error handling are not discussed, but the tool is simple enough that this is adequate.

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 0%, so the description must clarify parameters. It explains issuer_api_key ('from guild_register'), rating (scale and example), and provides examples for subject_id and capability. However, task_id is completely omitted from the description, and the relationship between rating and 'vouch vs. warn' is only implicit. This partial coverage earns a middle score.

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's purpose: 'Vouch for (or warn about) work another agent did for you.' It uses a specific verb ('vouch'/'warn') and resource ('work', 'trust graph'), and the example call with parameters disambiguates it from sibling tools like guild_register or guild_prove.

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 provides clear context for when to use the tool—when you want to rate another agent's work—and includes a prerequisite ('Authenticate with YOUR api_key from guild_register'). However, it does not explicitly mention alternatives or when-not-to-use scenarios, though the sibling tool names imply related but distinct operations.

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