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

With no annotations provided, the description must disclose behavior. It only gives an example format and never explains side effects, validation rules, or what happens with inputs. The ambiguity about whether it validates input or returns output is completely unaddressed.

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, but this is under-specification, not conciseness. It contains only a meaningless example without structuring any actionable information. The single sentence does not earn its place because it fails to convey purpose or use.

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?

With 9 parameters, zero required, no output schema, and no annotation coverage, this description is woefully incomplete. An agent cannot determine what to pass, what the tool returns, or when to invoke it. The selection and invocation correctness are severely compromised.

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%, so each parameter has a description, but the tool description adds no semantic value—it does not explain which parameter relates to the UTC offset shape or how the various parameters interact. The description's reference to 'UTC offset' is not mapped to any parameter, leaving the agent to guess.

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 is a fragment 'UTC offset shape like +02:00' with no verb or explicit resource. It does not state what the tool does (e.g., validate, check, return), making it impossible to distinguish from the many sibling 'shape' tools. It fails basic purpose clarity.

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 on when to use this tool versus alternatives like normalize-url, validate-json, or timezone. No context about typical invocation scenarios or which parameters are relevant. The description is entirely silent on usage.

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