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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It mentions the matching algorithm but does not state whether the operation is read-only, what the output format is (list of discs, details, ordering), or how edge cases (e.g., no matches) are handled. This is a significant gap for a tool with zero annotation coverage.

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 a single, focused sentence that front-loads the core purpose and algorithm. There is no redundant information or fluff, making it efficient for an agent to parse quickly.

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 tool has 4 parameters (all documented) and no output schema. The description explains the matching logic but omits critical context such as the return format (whether it returns full disc objects or just IDs), result ordering, and any read-only guarantees. Given the lack of annotations and output schema, the description is only partially complete for safe invocation.

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 all parameters are documented. The description adds minimal new meaning beyond the schema: it clarifies that disc_id refers to the target disc and that the tool uses category/speed/flight profile, but this is largely implicit in the schema. Since the schema does the heavy lifting, the description's contribution is modest.

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 states a specific action (find alternative replacement discs), the resource (discs), and the matching criteria (category, speed, flight profile) plus the algorithm (weighted Euclidean flight distance). This clearly distinguishes it from siblings like compare_discs, get_disc, and search_discs, which have different purposes.

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 no guidance on when to use this tool versus the sibling tools. It does not mention alternative tools, conditions for use, or when to avoid it. An agent would need to infer when similarity-based replacement finding is appropriate, which is not stated.

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