take_screenshot

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

With no annotations supplied, the description must cover behavior itself, and it does disclose the output format (PNG) and the default temp-file behavior for output_path. It says nothing about screen-recording permissions, multi-monitor selection, or what happens for an invalid or out-of-bounds region, which are real failure modes for a capture tool.

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 opening sentence is front-loaded with the core capability and the region format, and the use-case sentence earns its place by grounding when to invoke it. The Args block is slightly redundant in restating parameter names but adds real meaning beyond the bare schema.

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 two-parameter, zero-annotation tool with an output schema covering return values, this is nearly sufficient: capture modes, use cases, both parameter formats, and the default output location are all present. The remaining gap is environmental context such as permission requirements or monitor targeting.

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%, so the description carries the parameter burden, and it does document both arguments: region syntax with a concrete example ('0,0,800,600') and output_path semantics including the temp-file default. It stops short of stating whether parent directories are created or how negative or oversized regions are handled.

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 names a specific verb and resource ('Capture a screenshot') and distinguishes two modes: full screen versus a specific region with the x,y,width,height format. It does not differentiate itself from the sibling capture_camera_snapshot, which an agent could easily confuse with it.

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?

It gives concrete use contexts ('inspect application windows, error dialogs, or logic analyzer/oscilloscope GUIs'), which tells the agent when this tool is the right choice. It offers no exclusions or contrast with the closest sibling, capture_camera_snapshot, so the selection guidance is incomplete rather than explicit.

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