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

With no annotations provided, the description carries the full burden of behavioral disclosure, but it discloses nothing. The agent is left ignorant of whether this tool performs a lookup, validation, or transformation, and of any side effects or return behavior.

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 short but this is under-specification rather than conciseness. One redundant clause 'HTTP Codes: HTTP Codes' provides zero information and does not earn 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?

For a tool with no output schema and no annotations, the description provides no information about what 'code' means, what value to pass, or what the result will be. An agent cannot reliably select or invoke this tool based on the available context.

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?

The input schema covers the single parameter 'code' with the description 'Code to process', giving 100% schema coverage. The tool description adds nothing beyond the schema, but the baseline of 3 applies because the schema already documents the parameter.

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 'HTTP Codes: HTTP Codes' is pure tautology, restating the tool name without any verb, resource, or scope. The agent cannot determine whether this fetches, validates, explains, or maps HTTP status codes.

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 guidance is provided on when to use this tool versus sibling tools such as x402-http-status, x402-http-analyze, or x402-http-headers. The description contains no usage context, scenarios, or exclusions.

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