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

There are no annotations, so the description carries the full burden. It clearly states the operation is a comparison (read-only), which is a key behavior. However, it does not disclose details like whether the diff is side-by-side, or if it is safe to run without side effects. Since it explicitly mentions 'returns a structured diff', it adds behavioral context, but it lacks depth. Thus, a 3 is appropriate.

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, concise sentence that is front-loaded with the primary action ('Compare') and the resource. There is zero waste and every word earns its place. It is appropriately sized for the tool's simplicity.

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 is a simple comparison with two parameters and no output schema, the description is mostly complete. It does not explain the format of the return value beyond 'structured diff', but for a diff tool, this is likely sufficient. With no output schema, adding more detail about the return format would be helpful, but the current description meets the basic needs.

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% and the schema describes both parameters ('oldCode' and 'newCode') as 'Original FlowZap Code' and 'Updated FlowZap Code'. The description adds minimal semantic value by implying the diff is between old and new, which is already clear from the parameter names and schema. With high schema coverage, baseline 3 is 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 states a specific verb ('Compare') and resource ('two FlowZap Code versions') and mentions the output ('structured diff'). It is clear what the tool does, but it does not differentiate from siblings like flowzap_validate or flowzap_fix, which might also compare or analyze code. It is not a tautology, so it earns a 4.

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 this tool: when you need to compare two versions of FlowZap Code and get a diff. However, it does not explicitly state when not to use it or mention alternatives such as flowzap_validate for validation or flowzap_apply_change for applying changes. The usage context is clear but exclusions are missing, so it gets a 3.

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