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

With no annotations, the description carries the full behavioral burden and discloses almost nothing: not whether the operation is read-only (implied but unstated), not what granularity of differences are reported, and not that the tool operates on inline content rather than file paths. The one behavioral hint is that it takes 'two' inputs, which does map to the paired content1/content2 parameters.

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?

A single front-loaded sentence with no filler; it is appropriately terse for a schema that documents itself.

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?

With no annotations and no output schema, the description should carry the behavioral load, but it never says what the diff contains, whether it succeeds on mismatched formats, or how results are returned. For a tool with zero required parameters and paired optional inputs, that leaves meaningful gaps.

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 the baseline is 3 and the schema already explains format auto-detection and base64 encoding. The description adds nothing about parameters and its 'files' wording partly conflicts with the schema, which only accepts inline content and has zero required parameters.

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 and resource: 'Compare two fitness files and show differences', which is clearly distinct in kind from convert/validate/list_formats siblings. It stops short of naming a sibling alternative or scoping what 'differences' means, so it is clear but not differentiating.

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?

No indication of when to use this vs kaiord_validate, kaiord_round_trip_validate, or kaiord_inspect, all of which also take one or two fitness files. The agent must infer the choice from tool names alone.

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