char_count

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

There are no annotations, and the description only mentions cost. It does not disclose what the tool does, what data it operates on, or any side effects.

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 phrasing is very short, but it is under-specified rather than concise. The cost note is the only added detail and is not relevant to how the tool should be invoked.

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 part of a large family of text-analysis utilities, yet the description provides no context about functionality, input schema details, or return value. It is entirely inadequate for effective use.

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 only provides a generic 'params' object with no meaningful property details. The description adds no parameter explanation, leaving the user without any clue what arguments to supply.

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 merely restates the tool name ('char count') and categorizes it as 'Other Utilities tool.' It lacks a verb, a clear action, or any differentiation from sibling tools like word_count or line_count.

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 alternatives. The description does not specify input expectations, use cases, or exclusions.

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