INVOKE THIS SKILL when building ANY Deep Agents application. Covers create_deep_agent(), harness architecture, SKILL.md format, and configuration options.
Install
npx skills add langchain-ai/langchain-skills --skill deep-agents-corenpx skills add langchain-ai/langchain-skills --skill deep-agents-core -a claude-code -gnpx skills add langchain-ai/langchain-skills --skill deep-agents-core -a codex -ggemini skills install https://github.com/langchain-ai/langchain-skills.git --path config/skills/deep-agents-coregh skill install langchain-ai/langchain-skills deep-agents-coregit clone --depth 1 https://github.com/langchain-ai/langchain-skills /tmp/langchain-ai__langchain-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/langchain-ai__langchain-skills/config/skills/deep-agents-core ~/.claude/skills/deep-agents-core # Claude Code
cp -R /tmp/langchain-ai__langchain-skills/config/skills/deep-agents-core ~/.agents/skills/deep-agents-core # Codex, Cursor, Gemini CLI, Copilot, OpenCode