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

With no annotations provided, the description carries the full disclosure burden, but it only says 'Current UTC timestamp.' It does not disclose the return format, whether any network call or side effect occurs, or why the tool accepts 9 seemingly unrelated parameters (git refs, URLs, cities). The mismatch between purpose and parameters is unexplained.

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 maximally concise at four words, but it mostly restates the tool name 'utc-time' with only marginally more detail. It is under-specified rather than efficiently informative, so it does not fully earn its place.

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 no output schema, so the description must explain the return value, but it does not. With 9 optional parameters that appear unrelated to UTC time and zero annotations, a single phrase leaves the agent with no idea what to pass, what to expect back, or how this differs from 'timezone.' This is inadequate for a tool with this complexity.

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 coverage is 100% and baseline for parameter semantics is therefore 3. The description adds nothing about parameters, and none are required, but the schema already documents each one clearly. The odd disconnect between the tool's stated purpose and the parameters remains a source of agent confusion that the 3 baseline does not fully resolve.

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 states a clear resource (UTC time) and operation (get current timestamp), so an agent knows what the tool produces. However, it does not differentiate from the sibling 'timezone' tool, and it omits the output format (epoch seconds vs ISO string), leaving some ambiguity.

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?

No guidance is given on when to use this tool versus alternatives. The sibling 'timezone' tool clearly covers timezone-related lookups, and the description never draws that boundary or states prerequisites, even though the tool takes 9 optional parameters.

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