lookup_by_barcode

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the tool 'finds' a release, implying a read-only operation, but doesn't cover critical aspects like error handling (e.g., what happens if the barcode isn't found), response format, rate limits, or authentication needs. This leaves significant gaps for an agent to use it effectively.

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, efficient sentence with zero waste. It front-loads the core purpose ('Finds a release') and directly addresses the key parameter ('by its UPC/EAN barcode'), making it easy to parse quickly.

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 low complexity (one parameter) and the presence of an output schema (which should document return values), the description is minimally complete. However, with no annotations and sparse parameter details, it lacks context on behavior and usage that would help an agent operate it reliably in real scenarios.

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 description adds minimal semantic context beyond the input schema. It specifies that the 'barcode' parameter should be a UPC/EAN barcode, which clarifies the expected format, but with 0% schema description coverage and only one parameter, this is adequate baseline information. However, it doesn't detail constraints like barcode length or validation rules.

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 tool's purpose with a specific verb ('finds') and resource ('a release'), and identifies the lookup mechanism ('by its UPC/EAN barcode'). However, it doesn't explicitly differentiate from sibling tools like 'search_releases' or 'get_release_details', which could also retrieve release information through different mechanisms.

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 provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing a valid barcode), exclusions, or comparisons to sibling tools like 'search_releases' (which might handle partial matches or other criteria). Usage is implied but not explicitly defined.

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