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

The description does not disclose whether the tool is read-only, what side effects it has, what output it returns, or any error behavior. With no annotations, the description carries the full burden, and it fails to provide any behavioral clarity.

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 but omits essential information. While brevity is positive, the lack of a verb, subject, and parameter context makes the structure ineffective for an agent trying to understand the tool.

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 description is incomplete for the tool's apparent purpose. It does not mention expected input format, return value, timezone handling, or any relationship to the provided schema parameters, leaving too much unspecified for reliable use.

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 (url, host, json, zone) with descriptions that seem unrelated to a 'month-name' tool, such as 'JSON text to validate' and 'HTTPS URL to normalize or cite'. No parameter description explains how any of these inputs relate to obtaining or formatting a month name.

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?

Description 'UTC month name' has no verb and does not specify what the tool does with input parameters. It is ambiguous whether it returns the current month, formats a date, or extracts a month from a timestamp, and it does not distinguish itself from sibling tools like timezone or utc-time.

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 about when to use this tool versus alternatives. The sibling tools include timezone, utc-time, and iana-zones, but the description gives no indication of appropriate use cases or when this tool would be preferred.

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