WeChat Mini Program Dev MCP

Instructions

Implementation Reference

• src/tools/element.ts:148-173 (handler)

  The execute handler for the 'element_callMethod' tool. Parses arguments, resolves the target element using resolveElement helper, calls the specified method on the element with provided arguments, and returns a JSON-formatted result including the call outcome.

  execute: async (rawArgs, context: ToolContext) => {
    const args = callElementMethodParameters.parse(rawArgs ?? {});
    return manager.withPage(
      context.log,
      { overrides: args.connection },
      async (page) => {
        const element = await resolveElement(
          page,
          args.selector,
          args.innerSelector
        );
  
        const callArgs = args.args ?? [];
        const result = await element.callMethod(args.method, ...callArgs);
        return toTextResult(
          formatJson({
            selector: args.selector,
            innerSelector: args.innerSelector ?? null,
            method: args.method,
            arguments: callArgs,
            result: toSerializableValue(result),
          })
        );
      }
    );
  },

• src/tools/element.ts:28-33 (schema)

  Zod schema defining the input parameters for the element_callMethod tool: selector (required), innerSelector (optional), method (required), and args (optional array).

  const callElementMethodParameters = connectionContainerSchema.extend({
    selector: z.string().trim().min(1),
    innerSelector: z.string().trim().min(1).optional(),
    method: z.string().trim().min(1),
    args: z.array(z.unknown()).optional(),
  });

• src/tools/element.ts:76-76 (registration)

  The element_callMethod tool is registered in the createElementTools function by including createCallElementMethodTool(manager) in the returned array of tools.

  createCallElementMethodTool(manager),

• src/tools.ts:11-11 (registration)

  createElementTools (which includes element_callMethod) is registered in the top-level createTools function.

  ...createElementTools(manager),

• src/index.ts:17-17 (registration)

  The complete set of tools including element_callMethod is registered to the FastMCP server.

  server.addTools(createTools(manager));