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

No annotations are provided, so the description carries the full disclosure burden. It reveals the output encoding (hex digest) which is useful given there is no output schema, but says nothing about determinism, input encoding (UTF-8 text vs. bytes vs. pre-hashed data), or whether the operation is pure/side-effect free.

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 front-loaded sentence with no filler; size is appropriate for a one-parameter utility. It is terse rather than bloated, though the terseness edges into under-specification.

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 simple hash helper this is nearly adequate, but with no annotations, no output schema, and an undescribed input parameter, the description should at minimum pin down input encoding and confirm determinism. Those gaps are the ones most likely to cause a miscall.

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?

The single parameter 'data' has 0% schema description coverage and the description adds nothing about it. An agent cannot tell whether 'data' is literal text to be UTF-8 encoded, a hex string, or raw bytes — a material ambiguity for a hashing tool.

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 a specific verb ('Compute') and resource ('BLAKE3 hex digest'), so an agent knows exactly what operation it performs. It does not, however, explicitly distinguish itself from the commitment-related siblings (veya_store_commitment, veya_verify_commitment_onchain) that the 'commitment helper' tag alludes to.

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 parenthetical 'commitment helper' hints at a use case but gives no when-to-use condition, no prerequisites, and no named alternatives among the many commitment/proof siblings. An agent must infer the role from the tag alone.

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