Press Browser Key

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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true; the description reinforces the non-idempotency consequence with a retry caveat and mentions the post-action observation. However, it never says what 'destructive' means here (Enter submitting a form, Ctrl+W closing a tab, focus loss), which is the key risk an agent needs spelled out.

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?

Three short sentences, front-loaded with the action, then the return, then the caveat. No filler, though the return-value sentence is arguably wasted since an output schema exists.

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 destructive, open-world input tool whose sole required parameter has zero documented format, the description under-delivers. It doesn't compensate for the schema gap or characterize what a keypress can destroy, even though the output schema does relieve it of explaining return values.

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% for both parameters. The phrase 'browser key or shortcut' hints that 'key' accepts combos, but gives no syntax (e.g. 'Control+A' vs 'Ctrl+A' vs 'Enter'), and the optional 'description' parameter is entirely unexplained in both schema and description.

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 and resource ('Press a browser key or shortcut'), which cleanly separates it from click_what, hover_what and type_into. It doesn't explicitly name a sibling or a boundary condition, so it stops short of 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?

The only guidance is a retry heuristic ('avoid repeating writes after an uncertain result'), which tells the agent what not to do rather than when to choose press_key over type_into, select_into, or navigate. No preconditions or alternatives are named.

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