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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds meaningful behavioral context no annotation provides: the comparison is built from 'sourced apps on Vibe Shipped' and revenue figures are 'stated' (self-reported), which tells the agent how to interpret and caveat the numbers. It still omits error handling for invalid or unknown tool ids.

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 dense sentence with the comparison scope front-loaded and the output dimensions enumerated after the colon. No filler, no restatement of the tool name.

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 output schema, the description usefully enumerates what the comparison returns, which is exactly what the agent needs. The remaining gap is what happens on an unrecognized tool id, but for a read-only single-parameter tool this is close to sufficient.

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 coverage is 100% and the single parameter is documented with an example (["cursor","lovable"]). The description's '2-6' bound merely restates minItems/maxItems already in the schema, adding no new meaning.

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 ('Side-by-side comparison of 2-6 AI build tools') plus the exact comparison dimensions returned (app counts, revenue totals/medians, top apps, pricing). An agent can tell this apart from list_tools/top_tools by the multi-tool comparison scope, though no sibling is named explicitly.

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?

Usage is only implied: the '2-6 tools' framing signals this is for comparing multiple tools rather than fetching one. There is no explicit when-to-use statement, no exclusion (e.g. 'use list_tools to discover ids first'), and no named alternative such as top_tools.

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