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

With no annotations, the description carries full responsibility for behavioral disclosure, but it only restates the basic purpose. It does not mention that the tool consumes a diff, what format the commit message takes, whether conventions are applied, or what the response contains. The behavior is not contradicted, just severely under-described.

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 short and front-loaded, but the 'AI Commit Msg:' prefix is redundant with the tool name. The remaining sentence is efficient yet underspecified, so it reads more like a label than a genuinely useful definition.

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 tool with no annotations and no output schema, the description is too thin. It does not explain what the generated commit message should look like, how the diff parameter is used, or when the tool is appropriate. An agent would need additional knowledge to invoke it confidently.

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?

The schema describes the only parameter, 'diff', with 100% coverage, so the baseline is 3. The description adds no extra semantic detail beyond the schema, such as accepted diff formats or whether the parameter is truly optional.

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 clear verb and resource: 'Generate a commit message with AI.' It is distinct enough from siblings like x402-ai-changelog or x402-ai-diff-review because it names commit messages specifically. However, it does not explicitly distinguish itself from those alternatives or define scope such as conventional commit style.

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 alternatives like x402-ai-diff-review or x402-ai-changelog. There is no mention of context, exclusions, or prerequisites such as supplying a diff. An agent must infer the intended use case.

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