fx_page

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

With no annotations, the description carries the full behavioral burden. 'Current URL and title' implies a non-mutating read of page state, but it does not disclose output format, whether it waits for page load, or other behavior. It is adequate for a simple read-only tool but not richly transparent.

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?

The description is five words and contains no filler. It is front-loaded with the core purpose and is appropriately sized for a zero-parameter read-only tool.

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?

Given the tool's simplicity, no parameters, and read-only nature, the description is nearly complete. It states what the tool returns, although the exact return structure is not specified and there is no output schema to fill that gap.

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 has zero parameters, so the empty input schema is fully covered and no parameter documentation is needed. The description adds useful semantic context by specifying exactly what data is returned: the current URL and title.

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 'Current URL and title' clearly indicates the tool returns the current page's URL and title. It implies a read-only getter on the current page resource, which distinguishes it from sibling actions like fx_navigate or fx_click, though it lacks an explicit verb and explicit sibling differentiation.

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 guidance is provided about when to use this tool versus alternatives such as fx_status or fx_snapshot. The description simply states what it returns, without context on when it is appropriate or when another tool should be used instead.

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