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Browser MCP

by drisplabs
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Drag

drag

Move items or adjust sliders by dragging from a source point to a target point. Supports coordinates relative to an element. Returns updated page snapshot.

Instructions

Drag from a source point to a target point (optionally relative to an element via eid). Use for reordering lists, moving sliders/handles, or manipulating canvas objects. Returns a fresh page snapshot with any resulting changes.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "source_x": "<source_x>",
      "source_y": "<source_y>",
      "target_x": "<target_x>",
      "target_y": "<target_y>"
    },
    "name": "drag"
  }
}

Input Schema

NameRequiredDescriptionDefault
eidNoOptional element ID. When provided, coordinates are relative to the element top-left corner.
page_idNoThe ID of the page.
source_xYesX coordinate of the drag start point.
source_yYesY coordinate of the drag start point.
target_xYesX coordinate of the drag end point.
target_yYesY coordinate of the drag end point.
modifiersNoModifier keys to hold during the drag (e.g., Shift for constrained rotation, Control for copy-drag).

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv4.6.4

TDQS

A4/5.0
Behavior3/5

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

No annotations are provided, so the description carries full burden. It mentions return value ('fresh page snapshot') and optional parameters (eid, modifiers), but does not disclose potential side effects, waiting behavior, or error conditions.

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 extremely concise: two sentences that cover purpose, key parameters, use cases, and return value, with no wasted words.

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?

For a tool with 7 parameters and no output schema, the description covers main behavior, optional features, and return value. Lacks details on edge cases or behavior modifiers, but sufficient for typical use.

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 coverage is 100%, so baseline is 3. The description adds context about coordinates being drag start/end points and eid making coordinates relative, but does not significantly enhance understanding beyond schema descriptions.

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's function: 'Drag from a source point to a target point' and provides specific use cases (reordering lists, moving sliders/handles, manipulating canvas objects), distinguishing it from sibling tools like click or hover.

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

Usage Guidelines4/5

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

The description lists appropriate use cases explicitly, but does not mention when to avoid using this tool or suggest alternatives, which could be improved.

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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