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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint false. The description adds meaningful behavioral context by stating 'No data is stored or forwarded' and emphasizing determinism, which goes beyond the annotations. No contradiction exists.

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, compact sentence that front-loads the action and outputs, followed by a brief privacy guarantee. Every word earns its place and there is no redundancy.

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 simple one-parameter input and no output schema, the description adequately names all return components (fingerprint, byte length, algorithm) and adds a behavioral guarantee. The exact response shape is not specified, but it is sufficient 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 100% and the sole parameter is documented in the schema. The description reinforces that the parameter accepts any JSON value, but adds no additional syntax or format details. The baseline of 3 applies because the schema carries the full semantic load.

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 states a specific verb ('Turn') and resource ('any JSON value'), and identifies exact outputs (SHA-256 fingerprint, UTF-8 byte length, algorithm). It is clearly distinct from all sibling tools, none of which perform canonicalization or fingerprinting.

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 description implies that the tool is used whenever a deterministic JSON fingerprint is needed, but provides no explicit when-to-use conditions or alternatives. The sibling list shows no overlapping tool, so the absence of exclusions is acceptable, but the guidance remains only implicit.

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