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

No annotations are provided, so the description carries the full burden. It discloses rate limits (20 calls/day per IP) and mentions the need for an API key for more calls, which is useful behavioral context. However, it does not describe the output format, potential errors, or any side effects (though it's clearly read-only). This is adequate but not rich.

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 two sentences: the first delivers the core function, the second provides practical usage limits and an alternative. It is front-loaded, concise, and contains no fluff. Every word contributes value.

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?

Given the tool's simplicity (2 params, no output schema) and lack of annotations, the description is fairly complete: it explains what it does, includes rate limits, and points to an alternative. It could elaborate on what 'routes' means in output form or mention prerequisites, but the parent-combination explanation covers the core need.

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% for both parameters, so the schema already documents 'pal' and 'max_depth'. The description adds no extra parameter-specific details beyond restating the 1-3 step depth, which aligns with max_depth. According to the baseline rule for high schema coverage, a 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?

The description clearly states the tool's function with a specific verb and resource: 'Find breeding routes for a Pal in Palworld' and explains the output goal (parent combinations 1-3 steps). This distinguishes it from sibling tools like get_breeding_child or get_pal_info, which focus on different breeding or info tasks.

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 implies when to use the tool (when you need to breed a target Pal from parents) and provides clear context about rate limits and alternative access methods. However, it does not explicitly compare itself to sibling tools like get_breeding_child or state exclusion criteria, so it stops short of a 5.

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