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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds genuine domain behavior beyond that: R4 is a Verified Agent Purchase, the service 'does not place a real order at a third-party shop', the free check caps at R3, and mass tests stop at R3. These are substantive constraints an agent cannot get from annotations.

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?

Five short, front-loaded sentences with the primary listing first and semantic detail after; no filler or repetition. The phrasing is somewhat telegraphic ('by three paths'), which costs a little clarity, but every sentence carries content.

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 zero-param, no-output-schema reference tool, the description should fully explain the returned taxonomy. It defines R4 and states limits on R0-R3, but leaves the meaning of R0 through R3, the R4-N/R4-W seal variants, and the 'three paths' unexplained, so an agent cannot fully interpret the output.

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 tool takes zero parameters, so the baseline is 4. The description correctly spends no space on argument semantics and instead documents the enumerated level taxonomy itself.

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 opening sentence gives a specific verb and resource: 'List Ready4Bots levels R0 through R4, plus seal variants R4-N and R4-W.' It is immediately distinguishable from siblings like check_website and search_businesses. The only weakness is that 'levels' is domain jargon whose meaning must be inferred from later sentences.

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?

There is no explicit 'use this when' statement or named alternative. Usage is only implied via domain context ('The free check awards R0 through R3 only', 'Mass tests stop at R3'), which hints this is a reference tool for interpreting results produced by the check-related siblings, but the agent must infer that linkage.

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