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batch_evaluate

Run a JavaScript expression on multiple URLs sequentially to perform controlled batch checks across known pages.

Instructions

Visit multiple URLs sequentially and evaluate the same JavaScript expression on each page. Use for controlled batch checks across known pages when view_page/run_plan would be too chatty. Not for normal page reading, clicking, or form work.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlsYesArray of URLs to visit and evaluate sequentially
evaluate_per_pageYesJavaScript expression to evaluate on each page after it loads
settle_msNoWait time in ms after each page load before evaluating (default: 2000)
timeout_per_page_msNoTimeout per page in ms for the full navigate+settle+evaluate cycle (default: 30000)
continue_on_errorNoContinue processing remaining URLs if one fails (default: true)
Behavior3/5

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

No annotations provided, so description must cover behavior. It mentions sequential execution and batch nature but lacks details on return format, error behavior, or auth needs. Schema covers timeouts and continue_on_error partially. Adequate but not comprehensive.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two concise sentences, front-loaded with essential info. No unnecessary words. Every sentence adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Describes purpose and usage well, but lacks output schema or explanation of return results. For a batch tool, missing output behavior is a gap. Parameters are well-documented, but overall completeness is moderate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with good descriptions. The description adds context like 'sequential' and 'controlled batch' beyond schema. Slight extra value beyond baseline.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Description clearly states it visits multiple URLs sequentially and evaluates JavaScript expressions. Distinguishes from siblings like view_page/run_plan by noting batch use case.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says when to use (controlled batch checks) and when not to (normal page reading, clicking, form work). Provides alternative tools (view_page, run_plan) for different scenarios.

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

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