diff --git a/.claude/settings.json b/.claude/settings.json
new file mode 100644
index 00000000..a333b40d
--- /dev/null
+++ b/.claude/settings.json
@@ -0,0 +1,5 @@
+{
+  "worktree": {
+    "symlinkDirectories": ["node_modules"]
+  }
+}
diff --git a/.cursor/worktrees.json b/.cursor/worktrees.json
index 77e9744d..f9ed2c68 100644
--- a/.cursor/worktrees.json
+++ b/.cursor/worktrees.json
@@ -1,5 +1,5 @@
 {
   "setup-worktree": [
-    "npm install"
+    "./scripts/setup_worktree.py \"$ROOT_WORKTREE_PATH\" -s '/node_modules' -s '.cursor/rules'"
   ]
 }
diff --git a/.gitignore b/.gitignore
index 7a7b95cd..d3df7e76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,17 @@ dist/
 .env
 coverage
 *.mcpb
+
+.claude/
+!.claude/skills
+!.claude/settings.json
+.rules/
+.clinerules/
+.cursor/rules/
+.windsurf/rules/
+.roo/rules*/
+.github/copilot-instructions.md
+AGENT.md
+AGENTS.override.md
+CLAUDE.local.md
+README.pochi.md
diff --git a/.opencode/worktree.json b/.opencode/worktree.json
new file mode 100644
index 00000000..41c3b439
--- /dev/null
+++ b/.opencode/worktree.json
@@ -0,0 +1,5 @@
+{
+  "sync": {
+    "symlinkDirs": ["node_modules"]
+  }
+}
diff --git a/.windsurf/hooks.json b/.windsurf/hooks.json
new file mode 100644
index 00000000..5ffe08f1
--- /dev/null
+++ b/.windsurf/hooks.json
@@ -0,0 +1,10 @@
+{
+  "hooks": {
+    "post_setup_worktree": [
+      {
+        "command": "./scripts/setup_worktree.py \"$ROOT_WORKSPACE_PATH\" -s '/node_modules' -s '.windsurf/rules'",
+        "show_output": true
+      }
+    ]
+  }
+}
diff --git a/scripts/setup_worktree.py b/scripts/setup_worktree.py
new file mode 100755
index 00000000..2caf158a
--- /dev/null
+++ b/scripts/setup_worktree.py
@@ -0,0 +1,309 @@
+#!/usr/bin/env -S uv run --no-config --script
+# /// script
+# dependencies = ["gitignore-parser"]
+# ///
+"""Set up a worktree by copying or symlinking files from a root workspace."""
+
+from __future__ import annotations
+
+import argparse
+import os
+import shutil
+import sys
+import tempfile
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from pathlib import Path
+
+from gitignore_parser import parse_gitignore
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description="Copy or symlink files from a root workspace into the current directory."
+    )
+    parser.add_argument("root_path", type=Path, help="Root workspace path")
+    parser.add_argument(
+        "-s",
+        "--symlink",
+        action="append",
+        default=[],
+        metavar="PATTERN",
+        help="Glob pattern for files to symlink (repeatable)",
+    )
+    parser.add_argument(
+        "-c",
+        "--copy",
+        action="append",
+        default=[],
+        metavar="PATTERN",
+        help="Glob pattern for files to copy (repeatable)",
+    )
+    return parser.parse_args()
+
+
+def _canonicalize(p: Path) -> Path:
+    """Canonicalize a path by resolving each symlink component via readlink."""
+    result = Path(p.anchor)
+    for part in p.relative_to(p.anchor).parts:
+        if part == "..":
+            result = result.parent
+            continue
+        if part == ".":
+            continue
+        candidate = result / part
+        seen: set[Path] = set()
+        while candidate.is_symlink():
+            if candidate in seen:
+                raise OSError(f"symlink cycle detected at {candidate}")
+            seen.add(candidate)
+            link = Path(os.readlink(candidate))
+            candidate = link if link.is_absolute() else candidate.parent / link
+        result = candidate
+    return result
+
+
+def _pattern_targets_dotgit(pattern: str) -> bool:
+    stripped = pattern.lstrip("!").lstrip("/")
+    return stripped == ".git" or stripped.startswith(".git/")
+
+
+def _is_relative_to(path: Path, parent: Path) -> bool:
+    try:
+        path.relative_to(parent)
+        return True
+    except ValueError:
+        return False
+
+
+def _read_patterns(path: Path) -> list[str]:
+    """Read gitignore-format patterns from a file, returning raw pattern lines."""
+    patterns = []
+    for line in path.read_text().splitlines():
+        stripped = line.strip()
+        if stripped and not stripped.startswith("#"):
+            patterns.append(stripped)
+    return patterns
+
+
+def _build_matcher(patterns: list[str], root: Path):
+    """Build a gitignore-style matcher from a list of patterns."""
+    if not patterns:
+        return None
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".gitignore", delete=False) as f:
+        for p in patterns:
+            f.write(p + "\n")
+        tmp_path = f.name
+    try:
+        return parse_gitignore(tmp_path, base_dir=str(root))
+    finally:
+        os.unlink(tmp_path)
+
+
+def _lowest_common_ancestor(a: Path, b: Path) -> Path:
+    """Return the deepest common ancestor directory of two absolute paths."""
+    common: list[str] = []
+    for pa, pb in zip(a.parts, b.parts):
+        if pa == pb:
+            common.append(pa)
+        else:
+            break
+    return Path(*common) if common else Path("/")
+
+
+def _readjust_symlink_target(link_target: Path, root: Path, cwd: Path) -> Path:
+    """Decide whether a symlink target inside root should be readjusted for cwd.
+
+    Returns the (possibly adjusted) target path.
+    """
+    if not _is_relative_to(cwd, root):
+        return cwd / link_target.relative_to(root)
+    lca = _lowest_common_ancestor(cwd, link_target)
+    if lca == root:
+        return cwd / link_target.relative_to(root)
+    return link_target
+
+
+def _dst_exists(dst: Path) -> bool:
+    """Check if dst exists (includes broken symlinks)."""
+    return dst.exists() or dst.is_symlink()
+
+
+def copy_entry(src: Path, dst: Path, root: Path, cwd: Path) -> None:
+    """Copy a file or directory from src to dst, handling symlink readjustment."""
+    if src.is_symlink():
+        if _dst_exists(dst):
+            return
+
+        raw_target = Path(os.readlink(src))
+
+        if raw_target.is_absolute():
+            link_target = _canonicalize(raw_target)
+            if _is_relative_to(link_target, root):
+                new_target = _readjust_symlink_target(link_target, root, cwd)
+            else:
+                new_target = link_target
+        else:
+            resolved = _canonicalize(src.parent / raw_target)
+            if _is_relative_to(resolved, root):
+                # Inside root: preserve the relative target unchanged
+                new_target = raw_target
+            else:
+                # Outside root: convert to absolute
+                new_target = resolved
+
+        dst.parent.mkdir(parents=True, exist_ok=True)
+        os.symlink(new_target, dst)
+    elif src.is_dir():
+        if dst.exists() and (not dst.is_dir() or any(dst.iterdir())):
+            return
+        if dst.exists():
+            shutil.rmtree(dst)
+        shutil.copytree(src, dst, symlinks=True, copy_function=shutil.copy2)
+    else:
+        if dst.exists() and (not dst.is_file() or dst.stat().st_size > 0):
+            return
+        dst.parent.mkdir(parents=True, exist_ok=True)
+        shutil.copy2(src, dst)
+
+
+def symlink_entry(src: Path, dst: Path) -> None:
+    """Create an absolute symlink at dst pointing to src."""
+    if _dst_exists(dst):
+        return
+    dst.parent.mkdir(parents=True, exist_ok=True)
+    os.symlink(_canonicalize(src), dst)
+
+
+def main() -> None:
+    args = parse_args()
+    root = _canonicalize(args.root_path.absolute())
+    cwd = _canonicalize(Path.cwd())
+
+    if not root.is_dir():
+        print(f"error: root path is not a directory: {root}", file=sys.stderr)
+        sys.exit(1)
+
+    # Collect patterns: .worktreeinclude first, then CLI (CLI overrides)
+    copy_patterns = []
+    worktreeinclude = root / ".worktreeinclude"
+    if worktreeinclude.is_file():
+        copy_patterns.extend(_read_patterns(worktreeinclude))
+    copy_patterns.extend(args.copy)
+    symlink_patterns = list(args.symlink)
+
+    if not copy_patterns and not symlink_patterns:
+        print(
+            "error: no patterns specified (use -c, -s, or .worktreeinclude)",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+
+    # Build matchers
+    copy_matcher = _build_matcher(copy_patterns, root)
+    symlink_matcher = _build_matcher(symlink_patterns, root)
+    copy_allows_dotgit = any(_pattern_targets_dotgit(p) for p in copy_patterns)
+    symlink_allows_dotgit = any(_pattern_targets_dotgit(p) for p in symlink_patterns)
+    any_allows_dotgit = copy_allows_dotgit or symlink_allows_dotgit
+
+    # Determine cwd exclusion: only if cwd is inside root
+    cwd_exclude = cwd if _is_relative_to(cwd, root) else None
+
+    # Walk root and collect work items
+    work: list[tuple[str, Path, Path]] = []
+    seen_dsts: set[Path] = set()
+
+    for dirpath, dirnames, filenames in os.walk(root):
+        dp = Path(dirpath)
+
+        # Skip root's .git unless any pattern allows it
+        if dp == root and not any_allows_dotgit:
+            try:
+                dirnames.remove(".git")
+            except ValueError:
+                pass
+
+        # cwd exclusion
+        if cwd_exclude is not None:
+            canon = _canonicalize(dp)
+            if canon == cwd_exclude or _is_relative_to(canon, cwd_exclude):
+                dirnames.clear()
+                continue
+
+        # Check subdirectories for whole-directory matches
+        skip_dirs: set[str] = set()
+        for dname in list(dirnames):
+            src = dp / dname
+            rel = src.relative_to(root)
+            in_dotgit = bool(rel.parts) and rel.parts[0] == ".git"
+            dst = cwd / rel
+
+            if dst in seen_dsts:
+                skip_dirs.add(dname)
+                continue
+
+            if copy_matcher and copy_matcher(str(src)):
+                if not (in_dotgit and not copy_allows_dotgit):
+                    seen_dsts.add(dst)
+                    work.append(("copy", src, dst))
+                    skip_dirs.add(dname)
+                    continue
+
+            if symlink_matcher and symlink_matcher(str(src)):
+                if not (in_dotgit and not symlink_allows_dotgit):
+                    seen_dsts.add(dst)
+                    work.append(("symlink", src, dst))
+                    skip_dirs.add(dname)
+
+        dirnames[:] = [d for d in dirnames if d not in skip_dirs]
+
+        # Check files (includes symlinks to files)
+        for fname in filenames:
+            src = dp / fname
+            rel = src.relative_to(root)
+            in_dotgit = bool(rel.parts) and rel.parts[0] == ".git"
+            dst = cwd / rel
+
+            if dst in seen_dsts:
+                continue
+
+            if copy_matcher and copy_matcher(str(src)):
+                if not (in_dotgit and not copy_allows_dotgit):
+                    seen_dsts.add(dst)
+                    work.append(("copy", src, dst))
+                    continue
+
+            if symlink_matcher and symlink_matcher(str(src)):
+                if not (in_dotgit and not symlink_allows_dotgit):
+                    seen_dsts.add(dst)
+                    work.append(("symlink", src, dst))
+
+    if not work:
+        print("warning: no files matched any pattern", file=sys.stderr)
+        return
+
+    errors: list[tuple[str, Path, Exception]] = []
+
+    with ThreadPoolExecutor() as executor:
+        futures = {}
+        for action, src, dst in work:
+            if action == "copy":
+                fut = executor.submit(copy_entry, src, dst, root, cwd)
+            else:
+                fut = executor.submit(symlink_entry, src, dst)
+            futures[fut] = (action, src)
+
+        for fut in as_completed(futures):
+            action, src = futures[fut]
+            try:
+                fut.result()
+            except Exception as exc:
+                errors.append((action, src, exc))
+
+    if errors:
+        for action, src, exc in errors:
+            print(f"error: {action} {src}: {exc}", file=sys.stderr)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()