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

Annotations already declare the safety profile: readOnlyHint=true, idempotentHint=true, destructiveHint=false, openWorldHint=false. The description adds that the tool operates on zero-width text and supports encode/decode/strip/generate modes, but does not disclose return format, limitations, or mode-specific behavior beyond what the annotations and enum already imply.

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 a single short sentence and is front-loaded with the core concept, which is good. However, 'client and server side from freedailypro' is vendor-oriented noise that does not help selection or invocation, and the em-dash mode list is terse without structure.

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 has four parameters, no schema descriptions, no output schema, and complex mode-dependent behavior. The description omits parameter semantics, mode-specific requirements, and return behavior, so it is not complete enough for reliable invocation.

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 carry the burden for four parameters. It only maps loosely to the required 'mode' parameter by listing the four enum values; it never explains 'text', 'length', or 'carrier', leaving the agent unable to infer their roles or required presence by mode.

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 names a specific tool, 'invisible text generator', and lists the supported operations 'encode/decode/strip/generate zero-width', which helps an agent identify what the tool does. It stops short of fully differentiating from text siblings and includes some vendor noise, so it is clear but not maximally sharp.

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 description gives no guidance on when to use invisible_text versus other text tools, nor when to choose each mode. The mode names hint at possible use cases, but no conditions, alternatives, or prerequisites are stated.

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