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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and a closed-world scope, so the safety profile is fully covered. The description adds only that the output is a probability distribution/percentage, without noting accuracy, determinism of results, or error behavior for unknown varieties — modest value over the 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?

A single tight sentence with the verb and resource front-loaded and no wasted words. Slightly long relative to the small surface area but nothing that should be cut.

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?

No output schema exists, so the description usefully names the return content (probability distributions and percentages). For a simple two-parameter read-only calculator with full annotation and schema coverage, this is essentially complete, though it could say more about the shape of the results.

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%, so both sire and dam are fully documented (name or unique ID, case-insensitive). The description restates the sire/dam relationship but adds no syntax or format detail beyond the schema; baseline 3 is appropriate.

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 ("Calculate") and a precise resource ("offspring plumage color probability distributions and percentages") tied to a defined input (sire x dam cross). This is far more specific than a tautology and clearly distinct from siblings like list_quail_varieties or find_quail_pairings, though it never names an alternative 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?

The clause "when crossing a specific sire and dam variety" implies the usage context but gives no when-to-use vs when-not guidance or reference to sibling tools. An agent can infer the scenario but gets no explicit routing help.

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