diff_skill_versions

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

With no annotations, the description carries the full behavioral disclosure burden. It usefully reveals that when no historical version exists, the tool explicitly returns 'unchanged'. But it does not disclose whether the operation is read-only, how null versions are handled, or what 'unchanged' looks like in the response.

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 compact sentence that front-loads the main purpose and adds a relevant edge-case behavior in the second clause. There is no filler or redundant wording.

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 is relatively simple and has an output schema, so return-value documentation is already covered. However, given zero annotations and zero parameter documentation, the description leaves important invocation details unexplained, such as default version behavior, null handling, and how versions are identified. It is adequate but not fully complete.

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 0%, so the description must compensate by explaining parameter meaning. It only hints at 'two registered versions', which loosely maps to to_version and from_version, but it does not explain skill_id, the meaning of null/default values, or how versions are selected. This is insufficient compensation for the missing schema descriptions.

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 action ('compare') and the resource ('two registered versions of a Skill'), so the core purpose is unambiguous. It does not explicitly distinguish itself from siblings, but the diff-specific purpose is evident from the name and description.

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 implies that this tool is for comparing versions of a Skill, and it adds one conditional behavior about the no-history case. However, it does not provide explicit guidance on when to use this over alternatives like get_skill_content or check_compatibility, nor does it mention prerequisites for invoking the comparison.

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