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, yet it discloses nothing beyond the algorithm list — not the output shape (single digest vs. a map of four), not whether input is treated as UTF-8, and not error behavior. For a pure-function hashing tool this is a modest but real gap.

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?

One short sentence, front-loaded with the algorithm list. It is a fragment without a verb, but nothing is wasted and there is no filler.

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 one-parameter tool with no output schema, the key missing piece is what the caller gets back — one digest or four — plus input encoding assumptions. The description is adequate to identify the tool but not fully sufficient to predict its result.

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 single 'text to hash' parameter is fully documented in the schema, so the baseline is 3. The description adds only the algorithm vocabulary and no encoding or size hints beyond what the schema already supplies.

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?

Names the resource precisely (hex digests of a text) and enumerates the four supported algorithms, which clearly distinguishes it from siblings like base64_encode or uuid. However, it never states whether all four digests are returned together or whether the algorithm is somehow selected (the schema has only one parameter), leaving a small ambiguity about the operation's shape.

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 versus alternatives, nor any note on constraints (e.g., input encoding, empty-string behavior). The sibling set is different enough that an agent can infer the purpose, but the description contributes nothing toward that routing decision.

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