maintain | 2026-08-07 D 证据核验通过 + frontmatter 合规修复（type/confidence 补齐 23 处）

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 title: "LangChain Harness 工程实践"
+type: practice
+confidence: medium
 source: "https://blog.langchain.com/improving-deep-agents-with-harness-engineering/"
 author: "LangChain"
 published: 2026-02-18