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 one genuine behavioral fact: a cost of 1 credit per call. However, it says nothing about determinism, idempotency, input limits (the 100000-char cap), or that hashing/encoding are pure read-only operations, so meaningful gaps remain.

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?

Two tightly packed sentences, capability list front-loaded and the cost note appended with zero filler. Every clause earns its place.

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?

No output schema exists, so the description could reasonably say something about return values or the action/parameter relationship, but it does not. For a simple 4-param utility the enumeration of capabilities is minimally sufficient, though the low schema coverage leaves it thin.

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 only 25% (only 'count' is described), so the description should compensate. It instead restates the action/algorithm enum values (md5/sha1/sha256/sha512, base64/URL encode/decode) that are already visible in the schema and never explains the 'text' parameter or the action-to-parameter mapping.

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 concrete verbs and resources (hash, base64/URL encode/decode, generate UUIDs) so the tool's purpose is unambiguous. It does not, however, differentiate itself from nearby siblings such as hash_identify or text_diff, so it stops short of a 5.

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?

Usage is only implied by the enumerated capabilities; there is no explicit when-to-use, when-not-to-use, or alternative-tool guidance. An agent can infer this is the go-to for hashing/encoding, but nothing routes it away from siblings like hash_identify.

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