group_window

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description usefully confirms the operation is a toggle (reversible state change) and that it targets the focused window, but it doesn't explain what happens when no group exists or how existing groups are affected.

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 with no filler; the verb and target appear immediately with the clarifying parenthetical in place.

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-param toggle this is reasonably complete, and annotations carry the safety profile with no output schema needed. However, it omits the behavioral edge cases (what grouping does to the current layout, whether a minimum window count is required) that an agent would need to invoke it confidently.

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, so the baseline is 4. The description correctly clarifies that the target is implicitly the focused window, which is the only 'input' semantics that matters here.

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 ('Toggle') and a specific resource ('window grouping (tabbed mode)') with an explicit target ('the focused window'), so the agent knows exactly what operation it performs. It stops short of naming how it differs from the similar-looking toggle_split or toggle_float siblings, which is the only thing keeping it from a 5.

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?

There is no when-to-use guidance, no prerequisites (e.g. whether multiple windows must already exist), and no mention of alternatives such as toggle_split. The agent must infer the usage context entirely from the name and description.

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