app.quit

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

With no annotations, the description carries the full burden. It usefully discloses the headless no-op behavior, which an agent could not otherwise infer. But it does not say whether unsaved work is discarded, whether the process actually terminates, or whether a confirmation is raised — significant omissions for a quit operation.

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 short sentence with the headless caveat attached inline; no filler and nothing buried.

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 zero-parameter, no-output, no-annotation tool the description is nearly sufficient, but a quit action's most consequential detail — what happens to unsaved documents — is absent, and there is no return value to fall back on.

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 tool takes zero parameters and the schema has no properties, so there is nothing for the description to explain. Baseline of 4 applies.

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?

States a specific verb ('quit') and target ('the GUI'), so the agent knows this terminates the GUI application rather than a document or session. No sibling tool overlaps, so differentiation is moot. The only slight ambiguity is whether quitting is immediate or request-based, but the action is unmistakable.

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 parenthetical '(no-op in headless mode)' effectively tells the agent when NOT to bother calling it, which is real conditional guidance. However, there is no guidance on prerequisites (e.g. save documents first) or on what state the app must be in.

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