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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds valuable behavioral context beyond annotations: the ASCII-only limitation (English-style letters) and the return of vowel/consonant counts plus vowel ratio. No contradictions noted.

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 sentences, front-loaded with the action, and every word earns its place. The description is tightly written with no redundancy or filler.

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 single-parameter tool with a rich output schema and strong annotations, this description is complete. It covers the core behavior, the ASCII constraint, and the output shape, leaving no critical gaps for an agent to select and invoke the tool 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?

Schema coverage is 100% (the sole 'text' parameter is described as 'Text to analyze'). The description adds meaningful constraint 'ASCII-only', which sharpens the acceptable input beyond the schema's generic description, and also clarifies the analysis scope.

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 opens with 'Count vowels and consonants in text', a specific verb+resource statement that clearly distinguishes this tool from sibling text tools like character-counter and word-counter. It adds the ASCII-only scope, further clarifying its purpose.

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 purpose is so clear that the intended usage is implicit: use this when you need vowel/consonant counts and ratio. However, it does not explicitly name alternatives or exclusions, such as 'use character-counter for total character counts', so it stops short of full guidance.

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