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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds that the relationship is directional and lists possible values, which provides additional context but is not extensive.

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 a single, well-structured sentence with a secondary clarifying note. Every part serves a purpose—purpose, result type, and usage guidance—without unnecessary words.

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 simple two-parameter lookup tool with strong annotations and existing output schema, the description covers the core function and context. It could add more about the directionality or fallback behavior, but it is largely complete for its complexity.

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 0%, so description must compensate. It mentions 'two specific CWE IDs' and provides an example, but does not explicitly describe each parameter (source_id, target_id) or their formats/constraints. The example partially helps but is insufficient for full clarity.

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 explicitly states the tool fetches the directional relationship between two CWE IDs, listing the specific relationship types (parent/child/peer/precedes/can-precede). It identifies itself as a specialty tool, distinct from siblings like children, parents, and descendants.

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 gives clear guidance: 'most queries are better served by children / parents / descendants.' This indicates when to use alternatives. However, it does not specify exact conditions for using this tool over siblings beyond being a specialty case.

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