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Read-onlyIdempotent

Locate web page elements using natural language queries when exact selectors are unknown. Returns up to 20 matching references.

Instructions

Find elements by query. Returns up to 20 matches with refs.

When to use: Locating elements by natural language when exact selectors are unknown. When NOT to use: Use query_dom when you have a CSS selector or XPath, or interact to find-and-click in one step.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tabIdYesTab ID to search in
queryYesWhat to find (natural language)
waitForMsNoPoll timeout in ms. Default: 3000. 0 to disable
pollIntervalNoPoll interval in ms. Default: 200
vision_fallbackNoDeprecated alias for allow_vision_fallback (kept for back-compat).
allow_vision_fallbackNoOpt into vision-based screenshot analysis when DOM discovery returns nothing. #831 flipped the default to OFF — supply `true` here OR set OPENCHROME_VISION_MODE=on (or fallback/auto) to enable vision.
Behavior4/5

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

Annotations already indicate readOnly, nondestructive, idempotent. The description adds that it returns up to 20 matches with refs, providing useful behavioral context beyond annotations.

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?

The description is concise with only essential information, front-loaded with purpose, and every sentence adds value. No redundant text.

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

Completeness4/5

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

Despite no output schema, the description mentions return format (up to 20 matches with refs). It covers usage context well, though output structure specifics are omitted.

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

Parameters3/5

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

Schema description coverage is 100%, so baseline is 3. The description does not add parameter details beyond what the schema already provides.

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?

The description clearly states the tool finds elements by query and returns matches with refs. It distinguishes from sibling tools like query_dom and interact by specifying when to use alternatives.

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?

Explicit 'When to use' and 'When NOT to use' sections provide clear guidance, naming specific alternative tools (query_dom, interact) and conditions.

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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