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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the description does not need to cover side effects. It adds behavioral value by revealing that the result is 'random' (non-deterministic) and that it returns a 'labeled strategy card', which is not implied by the annotations. There is no contradiction with 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?

The description is somewhat repetitive: 'Use when solutions feel too minimal, when avoiding decisions, or when there's room to explore more possibilities' overlaps with 'Best for breaking self-imposed limitations' and the later list 'add more, elaborate, embrace abundance, do both'. It could be tightened to a single concise set of triggers without losing meaning. Still, it is front-loaded with the core action and not overly verbose, so it remains acceptable.

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 parameters and no output schema, the description covers the essential aspects: what it does, when to use it, and what it returns. The random nature is disclosed. Given the sibling tools, the category name 'Expand' provides enough context to differentiate. Nothing critical is missing for an agent to call this tool correctly.

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 has zero parameters, so the schema trivially covers 100% of them. The description does not need to add parameter information, and the baseline for 0 parameters is 4. The description does not introduce any parameter-related confusion.

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 verb 'Get' and the resource 'random Expand strategy', specifying the category 'Expand' which distinguishes it from siblings. It also describes the output as a 'labeled strategy card', giving a concrete sense of what the tool delivers. This is not a tautology; it adds specific meaning beyond the name.

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 explicit usage triggers: 'when solutions feel too minimal', 'when avoiding decisions', 'when there's room to explore more possibilities', and a list of keywords like 'add more, elaborate, embrace abundance, do both'. It clearly states when to use this tool, though it does not explicitly mention when not to use it or name alternatives. Since sibling tools exist, a direct contrast would elevate this to a 5, but the guidance is strong.

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