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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds only the algorithm/encoding surface and says nothing about local vs remote computation, idempotency, or the 100 KB input ceiling (which lives in the schema).

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 sentence with zero waste, front-loading the core action and immediately qualifying it with the supported algorithms and encodings. Nothing is padded or restated.

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 three-parameter, no-output-schema utility with full schema coverage and annotations covering safety, the description is close to sufficient. It could add one clause on input limits or the fact that hashing is deterministic/local, but nothing critical is missing.

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 100% and both optional parameters carry enums with explicit defaults in the schema, so the description merely restates the algorithm and encoding options. Baseline 3 applies when the schema fully documents the parameters.

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 (SHA-256/SHA-512 digest), plus the two output encodings. An agent can tell it produces a hash rather than decoding/encoding existing data, though it never explicitly distinguishes itself from the nearby base64_convert or jwt_decode siblings.

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 when-to-use, when-not-to-use, or alternative routing is given. Usage is only implied by the obvious purpose (you need a digest), so an agent must infer that base64_convert is the right sibling for pure encoding rather than hashing.

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