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

Annotations declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the safety profile is covered structurally. However, the description adds nothing of its own — notably it never explains patch semantics (partial/merge vs replace) or what happens to omitted fields, which is the single most important behavioral distinction of a patch tool.

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 four-word sentence is structurally clean and front-loaded with the verb, but here brevity reflects under-specification rather than discipline. It is not padded, so it avoids a lower score.

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 a nested patch payload, 100% schema coverage and the presence of an output schema, the description still owes the agent the patch-vs-update distinction and merge behavior. One sentence is inadequate for a mutation tool with this schema 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 description coverage is 100% and the schema documents all three parameters, including the nested patch object and its ignored generated keys, so the schema carries the load. The description contributes zero additional parameter meaning, making the baseline 3 correct.

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 is a verbatim restatement of the tool name and title ('Patch an interface contract'), which the rubric defines as tautology. It gives no indication of what distinguishes this from interface_contracts_update or requirements_patch.

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?

There is no when-to-use guidance, no statement of prerequisites, and no mention of the alternative tools (interface_contracts_update, requirements_patch) an agent should weigh against it. The agent is left to infer everything from the name alone.

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