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

With no annotations, the description carries the full behavioral burden, but it says only 'Mime Detect' and discloses nothing: no output format, no side effects, no error behavior, and no differentiation from other MIME-related tools. An agent cannot predict what calling this tool returns.

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?

It is technically short, but this is under-specification rather than economy. The single phrase does not earn its place because it merely repeats the tool name and conveys no actionable information.

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 3-parameter tool with no annotations and no output schema, the description must explain what inputs are expected and what the result looks like, but it contains none of this. The agent cannot invoke the tool correctly with only 'Mime Detect: Mime Detect'.

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 the baseline is 3 even though the description adds no parameter-level meaning. The schema itself only says 'Ext/Input/Extension to process', which remains ambiguous, but the tool description provides nothing further.

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 exactly 'Mime Detect: Mime Detect' – a tautology that restates the tool name and provides no verb, input, or output semantics. The name suggests MIME detection, but the description itself does not state what is detected, from what, or how the result is returned.

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?

There is no guidance about when to use this tool or how to distinguish it from obvious siblings such as x402-mime, x402-mime-type, x402-content-type, and x402-file-ext-info. No exclusions, alternatives, or context are provided.

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