一次睇曬 50+ 個 AI Agent 開源工具：2026 生態導航

Summary of what I did

1. Researched the current AI agent open-source landscape via GitHub topics (ai-agents: 35,691 repos; agent-harness: 259 repos) and key repos (ECC 204k★, Hermes Agent 177k★, LangChain 138k★, Gemini CLI 105k★, etc.)
2. Wrote a 2730-char Traditional Chinese (HK) blog post from an indie developer perspective with:
   • 3-tier framework: Runtime → Harness → Plugin
   • Harness analysis: ECC meta-harness, deer-flow long-horizon agent, oh-my-openagent
   • Plugin ecosystem: 530+ Claude Code plugins, mem0, MCP protocol
   • Practical recommendations for HK developers at different levels
3. Saved to /tmp/opencode/50-ai-agent-2026.md with full YAML frontmatter (tag build, kebab-case tags, summary ≤120 chars)