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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false. The description adds useful behavior beyond that: the transformation rule (first letter of each word) and the cost of 1 credit, which is operationally relevant for an agent.

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 appropriately short and front-loads the core explanation and example. It wastes some space by repeating 'Acronym Generator' twice at the start, but otherwise every sentence is useful.

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?

This is a simple single-parameter tool with full schema coverage, annotations covering safety, and an output schema. The description supplies the transformation logic, example, and cost, so nothing essential is missing for correct 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 100%, and the single parameter already documents that it must contain at least 2 words. The description reinforces this with an example but does not add substantial parameter-specific meaning beyond the schema.

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: it creates acronyms from phrases by extracting first letters, with a concrete example. It is very clear what the tool does, but it does not differentiate itself from nearby siblings such as AcronymExpander or InitialismGenerator.

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?

Usage is implied by the phrase-to-acronym explanation and the example, so an agent can infer when to use it. However, there is no explicit when-to-use guidance, no exclusions, and no comparison to alternatives like AcronymExpander.

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