Generate random bytes with crypt.generatebytes

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

Annotations already declare readOnly/idempotent/non-destructive, so the bar is lower, yet the description adds real behavior: default size 16, clamp to 1..1024, pcall-guarded, returns { error } rather than throwing on unsupported executors, and pure side-effect-free in-game compute. That is meaningful context beyond the structured safety hints.

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 opening sentences are well front-loaded, but the trailing meta block (Phase/cost/idempotency/Requires/Produces/Safety plus a repeated signature) largely restates annotations and the schema, padding the definition without adding selection value.

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?

With no output schema, the description correctly explains the return contract ({ bytes } or { error } as Base64) and the failure mode, which is what an agent needs to invoke and interpret it. Slightly long-winded but functionally complete.

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 schema already documents size with its default and 1..1024 clamp plus timeoutMs/threadContext. The description repeats the clamp/default without adding syntax beyond the schema, so baseline 3 applies.

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 (generate) and resource (cryptographically random bytes) and names the underlying primitive crypt.generatebytes. It also points to the complementary crypt-base64-decode sibling for raw bytes, so an agent can place it in the crypto family without opening a schema.

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?

Gives clear context: bytes come back Base64, decode with crypt-base64-decode if raw bytes are needed, and it requires an executor exposing crypt.generatebytes. It does not explicitly contrast with crypt-generate-key or crypt-hash, but the usage conditions are clear.

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