set_metadata

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

No annotations provided, so description carries full burden. It discloses that the tool replaces metadata entirely and includes field constraints (e.g., rating 0-10). However, it does not mention side effects, necessary permissions, or return value.

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?

Every sentence adds value. The description is front-loaded with purpose, then details fields, and ends with a usage note. It is efficiently structured without waste.

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?

The description thoroughly explains input fields but does not mention what the tool returns upon success or error cases. For a mutation tool with no output schema, this is a gap. It also lacks information on idempotency.

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% with parameter descriptions. The description adds extensive semantics for the 'fields' parameter, detailing each field's format, allowed values, and examples (e.g., authors format, pubdate format).

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 'Sets (REPLACES) a book's metadata.' It specifies the action (sets/replaces) and the resource (book metadata). The explicit mention of sibling tools add_tags and remove_tags distinguishes it from alternatives.

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?

Provides clear guidance on when to use this tool vs add_tags/remove_tags with the note that it replaces the whole field value. However, it lacks an explicit 'when to use' statement, though the context is implied.

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