完成任务16：编写 04_长期发展/环境保护.md

skills/file_reader/SKILL.md

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+---
+name: file_reader
+description: "Read and summarize text-based file types only. Prefer read_file for text formats; use execute_shell_command for type detection when needed. PDF/Office/images/archives are handled by other skills."
+metadata:
+  {
+    "builtin_skill_version": "1.0",
+    "copaw":
+      {
+        "emoji": "📄",
+        "requires": {}
+      }
+  }
+---
+# File Reader Toolbox
+
+Use this skill when the user asks to read or summarize local text-based files. PDFs, Office documents, images, audio, and video are out of scope for this skill and should be handled by their dedicated skills/tools.
+
+## Quick Type Check
+
+Use a type probe before reading:
+
+```bash
+file -b --mime-type "/path/to/file"
+```
+
+If the file is large, avoid dumping the whole content; extract a small, relevant portion and summarize.
+
+## Text-Based Files (use read_file)
+
+Preferred for: `.txt`, `.md`, `.json`, `.yaml/.yml`, `.csv/.tsv`, `.log`, `.sql`, `ini`, `toml`, `py`, `js`, `html`, `xml` source code.
+
+Steps:
+
+1. Use `read_file` to fetch content.
+2. Summarize key sections or show the relevant slice requested by the user.
+3. For JSON/YAML, list top-level keys and important fields.
+4. For CSV/TSV, show header + first few rows, then summarize columns.
+
+## Large Logs
+
+If the file is huge, use a tail window:
+
+```bash
+tail -n 200 "/path/to/file.log"
+```
+
+Summarize the last errors/warnings and notable patterns.
+
+## Out of Scope
+
+Do not handle the following in this skill (they are covered by other skills):
+
+- PDF
+- Office (docx/xlsx/pptx)
+- Images
+- Audio/Video
+
+## Safety and Behavior
+
+- Never execute untrusted files.
+- Prefer reading the smallest portion necessary.
+- If a tool is missing, explain the limitation and ask the user for an alternate format.