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Wechat Devtools MCP

Wechat Devtools MCP

by pureia
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

page_scroll_to

Scroll the current page to a specified vertical position by providing the target scrollTop value in pixels.

Instructions

将当前页面滚动到指定位置

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": {
      "scrollTop": "<scrollTop>"
    },
    "name": "page_scroll_to"
  }
}

Input Schema

NameRequiredDescriptionDefault
scrollTopYes滚动到页面的目标位置，单位 px

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.0.2

TDQS

C2.9/5.0
Behavior2/5

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

With no annotations, the description carries full burden for disclosing side effects. It only states the basic scroll action without mentioning whether scrolling is animated, whether it applies to the main page or a scrollable container, or how out-of-range positions are handled.

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 concise sentence with no filler. It is front-loaded and every word earns its place, making it highly efficient.

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?

Although the tool is simple, the description is too minimal to be standalone. It does not explain return values, side effects, or edge cases, and with no annotations it leaves the agent without important behavioral context.

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?

The sole parameter scrollTop is already fully documented in the schema with its meaning and unit (px). The description adds no additional semantic value beyond the schema, so the baseline of 3 is appropriate.

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

Purpose4/5

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

The description '将当前页面滚动到指定位置' clearly identifies the action (scroll), the resource (current page), and the target (specified position). It distinguishes from the sibling page_scroll_top by allowing arbitrary positions, though it does not explicitly name alternatives.

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

Usage Guidelines2/5

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

No guidance is provided about when to use this tool versus alternatives like page_scroll_top or element_scroll_to. The description is purely actional and lacks any contextual cues or exclusions.

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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