Ruff, Python, mypy, debugpy, Even Better TOML, EditorConfig, and GitHub Copilot.
Run tessl init to generate MCP configs for 5 agents (Claude Code, Gemini CLI, Codex, GitHub Copilot CLI, GitHub Copilot for VS Code). Track .mcp.json and .vscode/mcp.json for team sharing. Gitignore .tessl/session-data/ and .playwright-mcp/.