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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: no mention of accepted date input formats, what happens on an unparseable date, whether the format string follows a specific convention (strftime, etc.), or what the returned string looks like.

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?

Only four words, and the second half duplicates the first verbatim. This is under-specification rather than genuine conciseness; the one sentence that exists earns nothing.

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 no annotations, no output schema, and no parameter detail in the description, an agent has no way to know what a valid date string or format token looks like or what is returned. The definition is wholly inadequate for even a simple transformation tool.

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% (both 'date' and 'format' are described in the schema), so the baseline is 3. The description adds no syntax, convention, or example beyond the schema's placeholder text 'Date to process' / 'Format to process'.

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 bare restatement of the tool name: 'Format Date: Format date.' It names a verb and a resource but adds no scope, no output format, and nothing that distinguishes it from the many date-related siblings such as x402-parse-date, x402-format-d-d-m-m-y-y-y-y, or x402-date.

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 on when to use this tool versus any alternative, no statement of inputs accepted, and no exclusions. In a catalog containing dozens of competing date/format tools, this leaves the agent with nothing to route on.

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