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

With no annotations, the description carries the full burden. It discloses the core action, a meaningful side effect ('saves a full-resolution PNG to disk'), and the return behavior ('returns its path'). It does not detail every behavioral nuance, but it covers the key operational facts.

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?

Two sentences, front-loaded with the main action and purpose, followed by the side effect and return path. No wasted words.

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 no annotations and no output schema, the description compensates well by stating the action, purpose, side effect, and return path. It does not mention prerequisites like an open browser page, but that is reasonably implied by the tool set and sibling names.

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 100%, so the baseline is 3. The description adds no parameter-specific meaning beyond what the schema already provides, but it does not need to because each parameter is already described clearly.

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?

Description states a specific verb and resource ('Capture the current page as an image') and a clear purpose ('visually judge layout, spacing, and alignment'), which distinguishes it from text-, console-, and interaction-focused sibling tools.

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 clearly implies when to use it — when visual layout and spacing judgment is needed — but does not explicitly name alternatives or state when not to use it. Sibling tools like check_responsive and audit_design overlap somewhat, so an explicit exclusion would help.

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