Serena: Open-Source MCP Toolkit Gives Coding Agents IDE-Level Semantic Code Understanding — 23K+ Stars

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oraios/serena is trending as an open-source MCP toolkit that provides semantic code retrieval, editing, refactoring, and debugging capabilities to any AI agent via the Model Context Protocol. Unlike line-number-based approaches, Serena operates at the symbol level using language server protocol (LSP) backends, enabling agent-first abstractions that work reliably on large codebases. Integrates with Claude Code, Codex, OpenCode, Gemini CLI, Cursor, and JetBrains IDEs. For builders running coding agents, this is essentially 'an IDE for your agent' — the tool Claude Code and competitors don't ship natively.