excessive sequential tool calls instead of batching

### Describe the bug

When analyzing a 1.8MB JSON file with over 150 records, Copilot made 7+ separate tool calls across multiple rounds to extract data that could have been gathered in a single Python script

### Affected version

_No response_

### Steps to reproduce the behavior

Repro Steps:
1. Open Copilot CLI and point it at a JSON file
2. Ask: "Read and parse this file, extract fields a b c d e, and create categories from the data."
3. Count the number of separate tool calls Copilot makes before it has all the data it needs.

### Expected behavior

Copilot should generate a single Python script that parses the JSON, extracts all relevant fields, and outputs a consolidated summary. This should require 1-2 tool calls at most

### Additional context

_No response_

首先，使用一个包含超过150条记录和所述提取请求的1.8MB JSON文件，在Copilot CLI中复现该行为，然后追踪其工具调用在哪里进行协调。完成标准是：该请求通过不超过1-2次工具调用，在一个生成的Python脚本中收集所需的字段和类别。

由索引模型根据 Issue 内容生成。