fix(attribution): Write 工具错误提示缺乏引导性，导致模型无法正确转换数据类型 (issue_mnrlm3si_7cqccf)

Author: CodeBuddy Attribution Bot

config/source/skills/SKILL.md

@@ -39,6 +39,8 @@ alwaysApply: true
 
 - If the same path fails 2-3 times, stop retrying and reroute. Check platform skill, auth domain, runtime, and permission model before editing more code.
 - Always specify `EnvId` explicitly in code, configuration, and command examples when initializing CloudBase clients or manager operations. Do not rely on the current CLI-selected environment or implicit defaults.
+- When saving MCP or tool results to a local file with a generic file-writing tool, pass text, not raw objects. For JSON output files, serialize first with `JSON.stringify(result, null, 2)` and write that string as the file content.
+- If the file-writing tool reports that a field such as `content` expected a string but received an object, do not retry with the same raw object. Serialize the object first, then retry once with the serialized text.
 
 ### Do NOT use this as