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

Beyond the readOnlyHint=false annotation, it discloses the meaningful behavioral effect: releasing escrow to the seller. The alias note adds useful context. It does not mention irreversibility or permissions, but the core side effect is clear.

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 sentence, immediately front-loaded with '[Buy]' and the alias note. It communicates the essential purpose without waste.

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 tool with one parameter and no output schema, the description covers the core action. However, it does not explain the outcomes or return values, and the alias relationship could be clearer about whether ack_purchase is deprecated in favor of confirm_delivery.

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 schema has one parameter, purchaseId, with no description coverage. The description does not explain what purchaseId represents or how to format it. The parameter name is self-explanatory to some degree, but the description adds no semantic value for it.

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: 'buyer releases escrow to seller' and identifies it as an alias of confirm_delivery. This is a specific verb+resource combination that distinguishes it from sibling tools, though its relation to confirm_delivery is explicit.

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?

It names confirm_delivery as the alternative sibling and gives the context of releasing escrow, which implies when to use. It does not explicitly state when not to use it or why an agent might prefer confirm_delivery, but the context is clear enough.

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