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WeChat Mini Program Dev MCP

WeChat Mini Program Dev MCP

by yfmeii
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

element_setData

Set rendering data for a custom component instance using a selector and data object, enabling dynamic UI updates in WeChat Mini Programs.

Instructions

设置组件实例渲染数据，仅自定义组件可以使用。

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": {
      "selector": "<selector>",
      "data": "<data>"
    },
    "name": "element_setData"
  }
}

Input Schema

NameRequiredDescriptionDefault
connectionNo
selectorYes
innerSelectorNo
dataYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.2.4
  2. Removedv0.1.6
  3. Changed2 schema fields changedv1.0.0
    • addedInput schema / $schema
      Added value: +"http://json-schema.org/draft-07/schema#"
    • addedInput schema / additionalProperties
      Added value: +false
  4. First observed

TDQS

B3.2/5.0
Behavior2/5

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

No annotations provided, so description must cover behavioral traits. It omits effects like overwriting existing data, required authentication (connection parameter), or error behavior. Only 'only custom components' is stated, which is insufficient.

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

Conciseness4/5

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

Single sentence is concise and includes essential restriction, but lacks deeper structure. Could be expanded to cover parameters and behavior without becoming verbose.

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 4 parameters, nested objects, no annotations, and no output schema, the description is too sparse. It ignores connection setup, selector semantics, and output handling. Incomplete for effective use.

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?

Schema description coverage is 0%, yet description only hints at the 'data' parameter ('rendering data'). Parameters like selector, innerSelector, and connection are not explained. Minimal value added over schema.

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 the tool sets component instance rendering data and explicitly notes it is only for custom components, distinguishing it from page_setData. Verb and resource are specific.

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

Usage Guidelines3/5

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

Implied usage is setting data for custom components, but no when-not-to-use or alternatives are mentioned. The sibling page_setData exists, but the description does not compare them.

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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