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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered by structured data. The description adds one piece of genuinely useful context, the 1-credit cost, but does not describe output behavior or confirm that input is left unmodified.

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?

A single front-loaded sentence that packs purpose, mode list, and cost. Minor waste from repeating the title ('Reverse Text: Reverse Text transforms...'), but nothing else is extraneous.

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 only two parameters, full schema coverage, annotations, and an output schema, the description covers what the agent needs: what is reversed, the available modes, and the cost. Only the mode-selection guidance is thin, which is a minor gap at this complexity.

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%, so the baseline is 3, but the description earns above baseline: the 'mode' parameter has no enum and only says 'Reversal mode' in the schema, while the description supplies the concrete values (characters, words, lines). That is real meaning added beyond structured fields.

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 uses a specific verb and resource ('transforms text by reversing characters, words, or lines') and enumerates the three reversal modes. It is clear what the tool does, though it does not name a sibling it differs from (e.g., LineSorter, TextStyler) among a very large sibling set.

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 phrase 'with multiple reversal modes for different use cases' implies how the tool is used but never states when to choose it over alternatives or how to pick a mode. No exclusions or prerequisites are given, leaving the agent to infer usage.

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