redeemCoupon

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

With no annotations, the description carries the full burden of behavioral disclosure. It states the action but omits side effects (e.g., whether redemption is irreversible, if coins/gems are added to the player's account, or what happens with invalid codes). This is a mutation tool, so more detail about expected behavior is warranted.

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 directly communicates the tool's purpose without any extraneous information. Every word earns its place.

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 single-parameter tool without annotations or an output schema, the description covers the basic purpose but lacks details about the return value or any confirmation of redemption. It is adequate but not complete in terms of expected behavior.

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?

The parameter 'couponCode' is already well-documented in the schema as 'Coupon code to redeem'. The description adds no new meaning beyond restating 'coupon code' in the tool's purpose. With 100% schema coverage, a baseline score of 3 is appropriate.

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 action ('Redeem a coupon code') and its purpose ('for coins or gems'). The verb 'redeem' is specific and distinguishes this tool from all sibling tools, none of which perform redemption.

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?

No guidance is provided on when to use this tool versus alternatives. While the action is intuitive, there is no mention of prerequisites (e.g., having a valid coupon code) or when not to use it. The description is purely declarative with no contextual advice.

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