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

With no annotations, the description carries the full burden of behavioral disclosure. It provides none—no mention of side effects, read-only nature, rate limits, or output behavior. The tool's behavior is entirely opaque.

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 (a single phrase) but under-specifies the tool's function. It is not appropriately sized for a tool with 9 parameters and no annotations—essential details are missing, making it more under-specification than concise.

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?

For a tool with 9 optional parameters, no output schema, and no annotations, this description is severely incomplete. It does not explain what the tool returns, how to invoke it correctly, or what the parameters represent in context. The agent cannot determine the tool's purpose or usage from this text.

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 description coverage is 100%, so a baseline of 3 applies. The description adds no parameter-specific meaning beyond the schema, but the schema itself documents all nine parameters, so no additional info is required.

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 resource ('Common IANA timezone names') but lacks a clear verb or operation. It is ambiguous whether this tool lists, validates, or returns these names. It does not differentiate from sibling tools like 'timezone' or 'utc-time', and the purpose remains vague.

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. There are no conditions, exclusions, or references to sibling tools, leaving the agent to guess the appropriate context.

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