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\n\n---\n\nOne MCP tool that gives your coding agent fast, structure-aware sight into a codebase — and a safe,\nprecise way to change it. Warm, resident, always fresh. **Fully local.** This package downloads the\nmatching prebuilt `vyer` binary for your platform on install.\n\n## Use it\n\nVyer is an **MCP server** — your agent host launches it and talks to it over stdio. You don't run\n`vyer serve` by hand; you point your host (Claude Code / Cursor / Windsurf / Cline) at it:\n\n```jsonc\n// .mcp.json (or your host's MCP config)\n{\n \"mcpServers\": {\n \"vyer\": { \"command\": \"npx\", \"args\": [\"-y\", \"@0x1labs/vyer\", \"serve\", \"--root\", \".\", \"--watch\", \"--allow-writes\"] }\n }\n}\n```\n\nClaude Code one-liner:\n\n```sh\nclaude mcp add vyer -- npx -y @0x1labs/vyer serve --root . --watch --allow-writes\n```\n\n`--allow-writes` lets Vyer edit (drop it for read-only). Then tell your agent to prefer it:\n\n```sh\nnpx -y @0x1labs/vyer init # drops a managed note into ./CLAUDE.md (idempotent)\n```\n\nWant a global `vyer` command? `npm install -g @0x1labs/vyer`. To check it from a terminal (no agent),\nuse `vyer version` or `vyer query \"\"` — `serve` only does something when an agent drives it.\n\n## What you get\n\n| | |\n|---|---|\n| **Fast** | a resident warm core — roughly 4 ms a query, never a cold rescan |\n| **Precise** | hybrid lexical + structural + graph search; real AST spans, not text blobs |\n| **Safe** | deterministic AST edits — atomic, re-parse-checked, never stale after a write |\n| **Tiny** | one MCP tool (plus a gated editor) — about 2k tokens of metadata per turn |\n| **Polyglot** | 14 languages via tree-sitter (Rust, Python, JS/TS/TSX, Go, C/C++, and more) |\n| **Local** | your code never leaves the machine; sandboxed writes; no shelling out |\n\n## One loop, not just search\n\n```jsonc\n// find — describe it or name it\n{ \"queries\": [{ \"q\": \"where do we validate the auth token\" }] }\n\n// understand — definition + callers + callees + tests, in one call\n{ \"queries\": [{ \"q\": \"validateToken\", \"detail\": \"context\" }] }\n\n// change — a surgical, atomic edit (this is code_apply)\n{ \"edits\": [{ \"locator\": \"src/auth/token.rs#validate_token\", \"rename\": \"verify_token\" }] }\n```\n\n## Full documentation\n\nQuickstart, the agent playbook, security model, and benchmarks all live in the repo:\n\n### → **https://github.com/chirayuoli/vyer**\n\nNo prebuilt binary for your platform? Build from source (needs Rust 1.85+):\n`cargo install --git https://github.com/chirayuoli/vyer vyer-server`\n\nMIT OR Apache-2.0 · built by 0x1labs \n","readmeFilename":"README.md"}