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

The description does not explain any behavior, side effects, or output format. With no annotations, the description is the sole source of behavioral info, and it is severely lacking. The presence of irrelevant schema parameters further obscures what the tool actually does.

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 short, which is concise, but it omits necessary information about how the tool operates. The lack of any structural elements (e.g., mentions of inputs, outputs, or usage scenarios) makes it underinformative.

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 apparent simplicity, a complete description should at least specify that it ignores any provided parameters or that only a subset is used. The mismatch between description and schema leaves the agent without enough context to use the tool correctly or know what to expect.

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 schema lists four parameters with descriptions, but they are unrelated to fetching a UTC timestamp. The tool description does not mention any of these parameters, leaving their purpose unexplained and potentially misleading an agent into invoking the tool with irrelevant arguments.

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 it returns the current UTC timestamp, but it lacks an explicit verb and is ambiguous about whether it takes any input. The schema lists unrelated parameters (url, host, json, zone), which confuses the tool's actual purpose.

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 provided on when to use this tool versus alternatives like 'timezone' or 'validate-json'. The description offers no context for selecting it appropriately.

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