datetime_format_dt

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

No annotations exist, so the description must carry the full burden. It fails to disclose behavioral traits such as error handling on invalid inputs, default behavior when fmt or timezone is null, or any side effects. Minimal transparency.

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 a single, lean sentence with a helpful category tag [datetime]. It front-loads the core action. While concise, it sacrifices necessary detail; however, this is more under-specification than lack of conciseness.

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 presence of an output schema, return value details are not required, but the description must cover parameter semantics and usage context. It fails to do so, leaving significant gaps for correct invocation.

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 0%, yet the description only faintly hints at the 'fmt' parameter by mentioning 'strftime format'. It does not explain the expected format of 'dt_str', the role of 'timezone', or constraints. Insufficient parameter context.

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 clearly states the verb 'Format' and the resource 'datetime string', using a specified method (strftime format). It adequately distinguishes from sibling tools like datetime_parse or datetime_add_duration by indicating the nature of formatting. However, it does not explicitly mention the output type (formatted string), which would make it a 5.

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. Given multiple datetime siblings (e.g., datetime_parse, datetime_convert_timezone), the description should indicate appropriate scenarios, but it lacks such context.

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