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 states the tool is 'free' and validates against a schema, but it doesn't disclose what happens on validation failure, whether it returns detailed errors, or any side effects. For a validation tool, the behavior on invalid input is critical and not disclosed.

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 short sentences with no waste. The key action and input requirement are front-loaded, making it easy to scan.

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?

The tool has an output schema, so return values are likely covered there. However, with no annotations and no details on validation failure behavior, the description is not fully complete for an agent deciding whether to call this tool and how to interpret 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 description coverage is 0%, but the description says 'Pass the full card object,' which adds meaning beyond the schema's generic 'card' object property. However, it doesn't explain the structure of the card or what 'full' means, so the agent must infer the card shape from context.

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 validates a relationship memory card against the v1 JSON Schema, which is a specific verb and resource. It doesn't explicitly differentiate from siblings, but the validation action is distinct enough from retrieve/store that an agent can infer the purpose.

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 usage by saying 'Pass the full card object,' which tells the agent what input to provide. However, it doesn't explicitly state when to use this tool versus retrieve/store, nor does it mention any prerequisites or context for validation.

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