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

The description only mentions 'hex digest' implying output format. No annotations exist, so the description should disclose behavioral traits like algorithm properties or security implications. It does not, leaving the agent to infer behavior from the algorithm name alone.

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 extremely concise (3 words), which is good for brevity but lacks essential detail. It front-loads the algorithm but is too terse to be fully informative.

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 tool's simplicity and lack of annotations or output schema, the description should at least confirm the output format and any constraints. It only partially does so, leaving gaps about expected input format and output representation.

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?

With 0% schema description coverage, the description must compensate by explaining the 'text' parameter. It does not; the parameter's purpose is only inferred from the tool name. The description adds no value beyond the schema's type definition.

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 'SHA512 hex digest' clearly states the tool computes a SHA-512 hash and outputs a hexadecimal string. It is specific to the hash function and distinguishes it from siblings like hash_md5 or hash_sha256 by naming the algorithm. However, it could be more explicit about the action.

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?

No guidance is provided on when to use this tool versus other hash functions (e.g., when security or speed considerations matter). The description lacks context for selection among siblings.

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