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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds nothing beyond that: it does not say whether validate returns a boolean or an error message, what happens on malformed input, or what the default action is when action is omitted.

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?

A single terse sentence with zero padding, front-loaded with the verbs. Brevity is appropriate, though it is under-specified rather than optimally concise.

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 output schema, the description should explain the return shape of each mode — especially validate, whose output could be a boolean, a message, or a formatted error. Combined with 0% parameter coverage, an agent cannot invoke this confidently without guessing.

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 0%, so the description carries the full burden, yet it only echoes the action values. The required `json` payload and the indent parameter (range 1-8, applicable only to format) go entirely unexplained in both schema and description.

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?

States specific verbs (format, minify, validate) against a specific resource (JSON), so an agent knows exactly what the tool does. Sibling tools are all distinct utility functions, so no explicit differentiation is needed, but the description does not say it operates on a supplied string rather than a file.

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?

The three operation names are listed but there is no guidance on when to pick one over another, no note that indent only matters for format, and no mention of what validate does differently (report-only vs. mutate). Usage is only inferable from the action enum in the schema.

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