coupon_abuse_test

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

With no annotations provided, the description carries full burden and does well disclosing key behavioral traits. It explicitly states 'Side effects: Applies coupons to the cart. May modify cart totals' which is crucial for a mutation tool. It also describes the testing methodology and return structure. However, it doesn't mention authentication requirements (implied by auth_cookie parameter), rate limits, or whether changes are reversible.

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 perfectly structured and concise. First sentence states purpose, second explains methodology, third documents return format, fourth discloses side effects. Every sentence earns its place with zero wasted words. It's front-loaded with the most important information (what it does) followed by critical behavioral details.

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 mutation tool with 6 parameters, no annotations, and no output schema, the description is adequate but has gaps. It covers purpose, methodology, returns, and side effects well. However, it doesn't explain authentication context (despite auth_cookie parameter), doesn't mention error conditions, and doesn't provide examples of typical usage scenarios. Given the complexity, it should ideally include more operational context.

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%, so all parameters are documented in the schema. The description adds no additional parameter semantics beyond what's in the schema descriptions. It doesn't explain relationships between parameters (e.g., url vs coupon_endpoint) or provide examples of valid values. The baseline 3 is appropriate when the schema does all the parameter documentation work.

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 purpose: 'Test coupon stacking and alternation bypass' with specific testing methodology. It distinguishes from security-focused siblings by focusing on coupon abuse testing rather than authentication or injection vulnerabilities. However, it doesn't explicitly differentiate from potential similar commerce testing tools that might exist elsewhere.

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 provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (like needing a valid cart), doesn't specify what scenarios warrant coupon abuse testing, and doesn't reference any sibling tools that might be used in related testing workflows. The agent receives no contextual usage information.

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