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

No annotations are provided, so the description must carry the burden of behavioral disclosure. It only states the function without mentioning side effects, parameter side-effects, or return behavior. The schema's odd parameters (e.g., 'ref', 'city') are unexplained, further limiting 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 extremely concise and front-loaded, stating the core purpose in five words. It is efficient, though it may be too terse given the unusual parameter schema.

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 has a 7-parameter schema that seems disconnected from the described purpose, no annotations, and no output schema. The description fails to explain how parameters are used or which are required, making it impossible for an agent to call this tool correctly with confidence.

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 input schema has descriptions for each parameter, but they are unrelated to the tool's purpose (e.g., 'Git ref name', 'City name'). The description adds no meaning for these parameters and does not clarify their relationship to the UTC timestamp, leaving the agent confused about what to pass.

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 'Current UTC timestamp' clearly states the resource (UTC timestamp) and implies a 'get' action. However, it does not explicitly distinguish itself from sibling tools like 'timezone', so there's room for improvement.

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?

There is no guidance on when to use this tool versus alternatives. The description mentions nothing about use cases, prerequisites, or exclusions, leaving the agent without direction.

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