agentlux_purchase

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

With no annotations provided, the description carries full responsibility for behavioral disclosure. It explicitly states payments are in USDC, which is a critical behavioral trait for an agent managing finances. It also clarifies the auto-equip behavior. However, it omits failure modes (e.g., insufficient funds, unavailable item) and side effects beyond the purchase itself.

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 extremely concise: three short sentences (or fragments) that immediately convey the core action, payment method, and optional behavior. No unnecessary words or repetition. It is front-loaded and efficient.

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's simplicity, high schema coverage, and clear sibling context, the description adequately covers what an agent needs to know to invoke the tool successfully. It could mention the return value or error handling for completeness, but this is not essential for a straightforward purchase action.

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 both parameters have descriptions in the schema. The tool description adds 'Pays in USDC' and 'Optionally auto-equip', which slightly contextualize the parameters but do not add meaningful detail beyond what the schema already provides. Baseline of 3 is appropriate since the schema already does the heavy lifting.

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?

Description clearly states it purchases a marketplace item using the agent wallet, specifies payment in USDC, and mentions optional auto-equip. This distinguishes it from siblings like agentlux_equip (which only equips existing items) and agentlux_list_item (which lists items for sale). The verb 'purchase' and resource 'marketplace item' are precise.

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 use when wanting to buy an item from the marketplace, but provides no explicit guidance on when to use this tool versus alternatives (e.g., agentlux_equip for already owned items). It also does not mention prerequisites such as sufficient wallet balance or whether the item must be in stock. No when-not-to-use or error conditions are mentioned.

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