get_marketplace_stats

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

With no annotations, the description carries the full burden for behavioral disclosure. It does convey that this is a non-mutating read operation and specifies what data is returned (listing count and lowest price). However, it does not mention authentication needs, currency behavior, error conditions, or response structure, which would add useful transparency.

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, tight sentence that front-loads the core purpose. Every word earns its place, and there is no redundant or filler content.

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?

The tool is relatively simple, but the absence of an output schema, annotations, and parameter descriptions means the description must do more. It covers the main return values and the target release, but leaves gaps around currency semantics and response details. It is minimally viable, not complete.

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 0%, so the description must compensate for both parameters. It partially does by indicating releaseId targets 'a release', but it says nothing about the currency parameter, its 3-letter code format, or its default value. The parameter semantics are therefore incomplete.

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 a specific verb ('Get'), a specific resource ('marketplace listing count and lowest price'), and the scope ('for a release'). This is precise enough to distinguish the tool from siblings like get_price_suggestions or get_listing, since the combination of listing count and lowest price is unique.

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 gives no guidance about when to use this tool versus alternatives. It does not mention get_price_suggestions, get_listing, or any conditions that would make one choice preferable, leaving the agent to infer usage from the name alone.

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