Click And Upload

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

The description adds behavioral context beyond the annotations (destructiveHint=true): it specifically mentions arming Chromium's file chooser, injecting approved files, always removing interception, and avoiding a native OS picker. This gives the agent a clear picture of side effects and behavior.

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 dense sentence conveys the complete action sequence with no filler. The action verb 'Arm' is front-loaded, making the purpose immediately clear.

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 an output schema and annotations available, the description covers the core workflow but omits usage context, edge cases, and parameter details. It is adequate for a basic understanding but not fully complete for an agent to execute reliably without further schema inspection.

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 only 33% (only 'selector' has a description). The tool description mentions 'approved files' hinting at 'paths' but provides no detail on path format, timeout semantics, or how the selector target types work. It does not compensate for the low schema coverage.

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 clearly states the tool's function: it arms the file chooser, clicks a trigger, injects approved files, and removes interception. This specific verb-resource pairing distinguishes it from sibling tools like element_click (just clicks) and element_upload_file (likely uploads without clicking).

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?

No explicit guidance on when to use this tool versus alternatives such as element_upload_file or element_click_and_download. The description only describes mechanics, not the appropriate context or exclusions.

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