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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering safety and idempotency. The description adds the source URL and the unit list, which are useful but not strictly behavioral traits. It does not disclose any potential edge cases, rounding behavior, or error handling, but given the simple nature of a converter and the annotation coverage, a mid-range score is appropriate.

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 two concise sentences with zero fluff. The purpose is front-loaded, followed by the unit list and a source reference. Every sentence adds value, and the structure is clean and immediately readable.

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, read-only converter with a complete schema, output schema present, and annotations covering safety and idempotency, the description is fully adequate. It lists the units, provides the source, and states the core function. Nothing essential is missing for an agent to invoke it correctly.

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%, with all three parameters (value, from, to) described. The description lists the allowed units, which mirrors the enums in the schema but adds no new meaning beyond what the schema already provides. Per the rubric, baseline 3 is correct when schema does the heavy lifting.

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 converts angles between units, specifying the exact verb and resource. It lists the four supported units (deg, rad, grad, turn), which differentiates it from sibling converters like length, weight, or volume. The purpose is unambiguous and specific.

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 clearly implies when to use this tool: whenever an angle needs unit conversion. It doesn't explicitly mention alternatives or exclusions, but the tool name and description are self-explanatory. Since there are many converter siblings, the description's focus on angles is sufficient context for selection.

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