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

No annotations are provided, so the description carries the full behavioral burden, yet it discloses nothing about what the tool returns, whether it is read-only, or how it handles input. The description contains no behavioral information at all.

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?

'Code Points: Code Points' is a useless duplication rather than a concise description. It is technically short but fails to front-load any actionable information, so brevity provides no value here.

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 annotations, no output schema, and an ambiguous two-parameter input schema, the description is completely inadequate. An agent has no basis for deciding what the tool does or how to call it correctly.

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 schema documents both parameters ('text' and 'input') at 100% coverage, so the baseline is 3. However, the description adds no meaning beyond the schema and, worse, does not clarify the apparent ambiguity between two similarly described input 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?

The description 'Code Points: Code Points' is pure tautology, restating the tool name with zero additional information. It never states what the tool actually does (e.g., convert text to Unicode code point values) or what resource it operates on, so an agent cannot distinguish it from siblings like x402-char-codes or x402-to-unicode.

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 whatsoever on when to use this tool versus alternatives such as x402-char-codes, x402-char-count, or x402-to-unicode, all of which appear closely related. Nothing indicates context, prerequisites, or exclusions.

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