get_api_metadata

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

The readOnlyHint annotation already indicates this is a safe read operation. The description adds no additional behavioral context such as side effects, rate limits, or authorization requirements. It is consistent with the annotation but does not go beyond it.

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 with no fluff. Every word contributes meaning, and the key resource is front-loaded. It is an model of conciseness.

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 minimal complexity (zero parameters) and the availability of an output schema, the description is fully complete. It states exactly what the tool returns, and the output schema handles details of the response structure. No other context is needed.

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 tool has zero parameters, so the input schema is empty and there is nothing to explain. Per the rubric, a 0-parameter tool earns a baseline of 4. The description correctly implies no arguments are needed.

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 uses a specific verb ('Return') and a clear resource ('Open Targets Platform release metadata'), which precisely defines its scope. It distinguishes itself from all sibling tools, which focus on diseases, drugs, targets, or variants, by pointing unambiguously to platform-level metadata.

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 resource is self-explanatory: this tool is for obtaining release metadata. While it does not explicitly state when to use it over alternatives, the context makes it obvious that no other sibling tool provides this kind of platform-level information. The description gives clear context without exclusions.

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