take_screenshot

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

With no annotations, the description carries full responsibility for behavioral disclosure. It only states the action but does not disclose where the screenshot is saved, what output it returns, whether it is safe/read-only, or any side effects. This is a significant gap for an unannotated 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 description is a single, compact sentence with zero filler. It is front-loaded and every word earns its place, making it highly efficient.

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?

The tool has no output schema, so the description should explain return values or side effects, but it does not. It lacks essential context for an agent (e.g., where the screenshot is stored, what the tool returns, or whether it requires page readiness). For a simple tool, the description is minimal but incomplete given the agent's need to know the outcome.

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 single optional parameter 'filename' is fully described in the input schema (100% coverage), so the schema already provides semantics. The description adds no additional parameter meaning, so baseline 3 is appropriate.

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 'Take a screenshot of the current page' uses a specific verb ('take') and resource ('screenshot of the current page'), clearly distinguishing this tool from sibling tools like login_user or add_product_to_cart. It is unambiguous and directly states the tool's function.

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 description implies usage (when you need a screenshot) but provides no explicit when-to-use guidance, exclusions, or alternatives. Sibling names make the distinct purpose obvious, but no contextual direction is given for when to choose this tool over others.

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