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

No annotations are provided, so the description carries the full behavioral burden, yet it discloses almost nothing: no indication of whether the click waits for navigation, what errors occur on invalid coordinates, or whether tab_id must be an active tab. Only the 'viewport' qualifier adds real context.

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 and the condition stated immediately. It is efficient, though so terse that it borders on under-specification rather than ideal conciseness.

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 four-parameter mutation tool with no annotations, no output schema, and low schema coverage, the definition omits too much: tab_id semantics, coordinate origin/units, click side effects, and notification_message usage are all unaddressed.

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 coverage is only 25%, and the description only clarifies that x/y are viewport-relative rather than page-relative. The required tab_id and the optional notification_message behavior are left entirely to the schema, which is thin, so the description does not compensate for the coverage gap.

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 ('Click at viewport x/y'), which is clearly distinguishable from the coordinate-free sibling browser_click. It doesn't name browser_click explicitly, but the phrase 'when snapshot refs are empty' implicitly scopes it to the coordinate-fallback case.

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?

Provides a clear triggering condition ('when snapshot refs are empty'), which is the key routing signal versus the ref-based browser_click. It stops short of naming the alternative tool or describing what to do if both refs and coordinates are available.

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