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

Annotations already provide readOnlyHint=true, openWorldHint=true, and destructiveHint=false, and the description does not contradict them. The description adds no behavioral detail beyond that, such as ordering, unknown-store behavior, or response shape, but the annotations cover the core safety profile.

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, front-loaded sentence with no filler or redundancy. Every word contributes to the core meaning, and it is appropriately sized for a simple lookup operation.

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 read-only tool with well-documented parameters, the description plus schema and annotations are mostly sufficient for correct invocation. However, given the large set of sibling deal tools and the absence of an output schema, a brief note about when to choose this store-filtered tool over related alternatives would improve completeness.

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%: 'store' is fully defined with an enum of valid stores, and 'limit' includes default and maximum values. The description adds no parameter-level meaning beyond what the schema already provides, so the baseline of 3 applies.

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 verb ('Get'), the resource ('deals'), and the distinguishing scope ('from a specific store'). This differentiates it from category-, price-, and trend-based deal tools, though it is close to a plain restatement of the tool name and does not explicitly address nearby siblings like get_deal or search_deals.

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 intended use is implied: use this tool when deals need to be filtered by store. There is no explicit when-to-use guidance, no mention of when not to use it, and no alternative sibling tools are named, so the agent must infer routing from the name and description alone.

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