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

The annotations already declare this as read-only, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds useful scope by naming the comparison dimensions, but it does not disclose error behavior, slug resolution rules, or other operational details beyond what annotations and schema already provide.

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 efficient sentence with the core purpose front-loaded. Every clause contributes either the comparison scope or the compared dimensions, with no wasted text.

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 annotations, schema, and output schema are rich, so the description does not need to explain safety or return values. It is complete enough to support correct invocation, though it omits explicit routing guidance versus sibling tools.

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%, and the schema already defines the slugs array, minItems, maxItems, and slug pattern. The description repeats the 2–5 tool constraint but adds no additional meaning about slug format, handling of invalid slugs, or ordering.

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 specific verb and resource: 'Side-by-side comparison of 2–5 tools.' It also enumerates the compared dimensions, making the tool's output clear. It does not explicitly distinguish itself from sibling tools such as get_tool or find_alternatives, which keeps it at a 4 rather than 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?

The multi-tool comparison scope implies when the tool is useful, and the 2–5 tool constraint provides some operational context. However, it gives no explicit guidance on when to use this instead of get_tool, find_alternatives, or search_tools, and no exclusions or prerequisites are stated.

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