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

With no annotations provided, the description carries the behavioral disclosure burden. It does add useful context about HTTP-style invocation ('?text=...') and the $0.001 price, but it does not describe the response behavior, error cases, or any limits. This is acceptable for a simple stateless hash tool but not thorough.

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 description is extremely concise with no filler. It front-loads the core capability, then gives a usage example, then the pricing note. Every part 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?

The tool is simple and an output schema exists, so return-value documentation is not required. Still, the description omits any guidance on missing/empty text behavior and does not explicitly connect usage to the sibling api_sha256. It is adequate for a trivial call but leaves minor gaps.

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%, so the description must compensate for the text parameter. The '?text=...' example adds a small amount of meaning by showing the parameter name and how it is passed in the request. It does not specify length limits, encoding, null behavior, or whether text is required.

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 identifies the exact algorithms (MD5, SHA-1, SHA-256, SHA-512) and signals this is a multi-hash endpoint via 'in one call'. It is clear what the tool does, though the verb is implicit rather than stated. It differentiates from the sibling api_sha256 without naming it.

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 phrase 'in one call' implies use when multiple hash algorithms are needed at once, and the sibling list suggests api_sha256 exists for single-hash needs. However, there is no explicit when-to-use or when-not-to-use guidance, and no alternative is named.

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