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

With no annotations, the description carries the full burden, and it does disclose two useful traits: an API-key policy check gates the operation, and the payload is sealed with Kyber-768 plus signed with ML-DSA-44. It does not explain failure behavior when the rule denies, idempotency, or the key material requirements, leaving meaningful gaps for a mutation/route tool.

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 sequences the policy check before the action, with no filler. It is efficient, though it compresses two distinct steps into one clause.

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 9-parameter crypto routing tool with no annotations, no output schema, and 0% schema coverage, one sentence is insufficient. The description omits parameter meaning, error/denial behavior, and any indication of what the caller receives back.

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% across 9 parameters, so the description must compensate and largely does not. It only obliquely references 'this API key' (apiKey) and 'message' (payload), leaving environmentId, id, fromAgent, toAgent, tool, senderPrivateKeyHex, and senderPublicKeyHex entirely unexplained.

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 names a specific flow: check the saved tool rule for the API key, then wrap a message in a Kyber-768 session and ML-DSA-44 signature. This clearly identifies the verb (route/secure) and resource (message), and the crypto primitives distinguish it functionally from plain veya_route_message. It stops short, however, of naming that sibling or any other alternative, so the differentiation is inferred rather than stated.

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 explicit when-to-use or when-not-to-use guidance. The phrase 'an allowed message' implies a policy gate, but the description never says which alternative (veya_route_message, veya_seal_decision) to pick or under what conditions. An agent must guess at the routing context.

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