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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, openWorldHint=false). The description adds genuine context by disclosing the exact 2.54 cm/inch factor and that a 150-200 cm chart is included, but says nothing about return format or edge handling, so a middling score fits.

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?

Front-loaded with the core conversion in one sentence, followed by a concrete example, the chart note, and a URL. Efficient and scannable, though the trailing web-page link is marginal value.

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 a simple math converter with a fully documented 4-parameter schema and safety annotations, the description is essentially complete. No output schema exists, but the description notes the chart output, so an agent has enough to call 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%, so all four parameters are documented in the schema and baseline is 3. The description reinforces the directionality that the 'mode' enum encodes (cm2ft vs ft2cm) with a worked example, but adds no syntax or constraint detail beyond the schema.

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?

States a specific verb (convert) and resource (height between cm and feet/inches) with both directions named, so an agent can immediately tell it apart from unit_converter or shoe_size_converter. Lacks any explicit sibling reference, keeping it from a 5.

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?

Usage is implied by the conversion description but there is no explicit when-to-use or when-not-to-use guidance, nor any pointer to the closely related unit_converter sibling. The agent can infer purpose but must guess at boundaries.

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