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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, which cover the main behavioral traits. The description adds little beyond stating it 'traces' history, and does not mention potential pitfalls like pagination, limits, or the meaning of 'indexed' in practice.

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, focused sentence with no unnecessary words. It clearly communicates the primary action and purpose, making it concise and well-structured.

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 the tool's 7 parameters and no output schema, the description provides minimal context. It does not explain what 'indexed' means, what constitutes a 'history' response, or how parameters like arch, repo, release, and catalog_revision affect results. This leaves the agent with insufficient context for proper invocation.

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 has 7 parameters with zero description coverage. The description does not mention any parameter, their roles, or which are required versus optional. It fails to compensate for the lack of schema-level explanations.

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's purpose—tracing indexed package version history for regression investigation. It uses a specific verb ('trace') and resource ('package version history'), and is distinguishable from siblings like get_package and compare_package_versions, though it does not explicitly contrast itself.

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 a vague use case ('for regression investigation') but offers no explicit guidance on when to use this tool versus alternatives such as get_package or compare_package_versions. No selection criteria or conditional advice is given.

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