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Mochi

Mochi

by DevZonayed
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Local

browser_scroll

Scroll the active browser tab to specified absolute coordinates or by relative offsets.

Instructions

Scroll the active session tab. Pass {x,y} for absolute or {deltaX,deltaY} for relative.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "browser_scroll"
  }
}

Input Schema

NameRequiredDescriptionDefault
xNo
yNo
deltaXNo
deltaYNo
tabIdNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.5/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It only states the scroll modes without disclosing details such as coordinate units, whether scrolling is smooth or instant, or if it affects the entire viewport or a specific element. This is minimal.

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 a single sentence that is front-loaded and contains no wasted words. It efficiently conveys the core action and parameter options.

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

Completeness2/5

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

Given the lack of output schema and annotations, the description is too brief. It fails to explain coordinate units, the interplay between absolute and relative parameters, or the purpose of tabId. Important context is missing.

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

Parameters2/5

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

With 0% schema description coverage, the description must compensate. It explains x,y,deltaX,deltaY but omits the tabId parameter entirely and does not specify coordinate units (pixels, etc.). Only partial parameter meaning is conveyed.

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 it scrolls the active session tab and distinguishes between absolute and relative scrolling, which differentiates it from sibling tools like browser_click or browser_navigate.

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 provides clear guidance on when to pass {x,y} for absolute scroll and {deltaX,deltaY} for relative scroll, but does not mention when not to use the tool or alternatives.

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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