diff --git a/scripts/pre-commit-repl-check b/scripts/pre-commit-repl-check
new file mode 100755
index 0000000..0169c01
--- /dev/null
+++ b/scripts/pre-commit-repl-check
@@ -0,0 +1,93 @@
+#!/bin/bash
+# Pre-commit hook: verify all defuns in staged .org files compile in the daemon.
+# For each changed .org file, it tangles to .lisp then sends the entire file
+# to the daemon for compilation. This catches undefined symbol references,
+# syntax errors, and broken function bodies.
+#
+# Install:
+#   ln -sf ../../scripts/pre-commit-repl-check .git/hooks/pre-commit
+#
+# Requires: running daemon on port 9105, repl script, emacs with ob-tangle.
+#
+# Returns 0 (pass) or 1 (fail).
+
+set -euo pipefail
+IFS=$'\n\t'
+
+REPL=$(command -v repl 2>/dev/null || echo "/home/user/.opencode/bin/repl")
+PORT=9105
+PROJECT_DIR=$(git rev-parse --show-toplevel 2>/dev/null || echo "/home/user/memex/projects/passepartout")
+
+# Check daemon connectivity
+if ! timeout 2 bash -c "echo >/dev/tcp/127.0.0.1/$PORT" 2>/dev/null; then
+    echo "ERROR: Daemon not reachable on 127.0.0.1:$PORT. Start it first." >&2
+    exit 1
+fi
+
+# Collect changed .org files from the index
+CHANGED=$(git diff --cached --name-only --diff-filter=ACM | grep '\.org$' || true)
+if [ -z "$CHANGED" ]; then
+    exit 0
+fi
+
+FAILED=0
+for orgfile in $CHANGED; do
+    [ -f "$orgfile" ] || continue
+
+    # Determine the tangle target from the org file's PROPERTY line
+    TANGLE=$(grep 'header-args.*:tangle' "$orgfile" | sed "s/.*:tangle //" | head -1)
+    if [ -z "$TANGLE" ]; then
+        echo "SKIP: $orgfile — no :tangle header" >&2
+        continue
+    fi
+
+    # Resolve relative tangle path
+    ORG_DIR=$(dirname "$orgfile")
+    LISP_FILE=$(cd "$ORG_DIR" && realpath -m "$TANGLE" 2>/dev/null || echo "$ORG_DIR/$TANGLE")
+
+    # Tangle the org file to lisp
+    if ! emacs --batch -L "$PROJECT_DIR" --eval "(require 'ob-tangle)" \
+         --eval "(org-babel-tangle-file \"$ORG_DIR/$(basename "$orgfile")\")" \
+         2>/dev/null; then
+        echo "FAIL: $orgfile — tangling failed" >&2
+        FAILED=1
+        continue
+    fi
+
+    if [ ! -f "$LISP_FILE" ]; then
+        echo "SKIP: $orgfile — tangle target $LISP_FILE not found" >&2
+        continue
+    fi
+
+    # Compile the lisp file in the daemon.
+    # We send a Lisp form that compiles the file and returns T or an error string.
+    # Using format to avoid backquote/comma issues.
+    LISP_ABS=$(realpath "$LISP_FILE")
+    CODE=$(cat <<-LISPEOF
+    (let ((*standard-output* (make-broadcast-stream))
+          (*error-output* (make-broadcast-stream)))
+      (handler-case
+          (progn
+            (compile-file "$LISP_ABS")
+            (load (compile-file-pathname "$LISP_ABS"))
+            (format nil "OK"))
+        (error (c)
+          (format nil "COMPILE-ERROR: ~a" c))))
+LISPEOF
+)
+    RESULT=$(printf '%s' "$CODE" | timeout 10 "$REPL" 2>/dev/null || echo "DAEMON-UNREACHABLE")
+
+    if echo "$RESULT" | grep -q '^COMPILE-ERROR:\|^DAEMON-UNREACHABLE\|^$'; then
+        echo "REJECT: $(basename "$orgfile") — compilation failed: $RESULT" >&2
+        FAILED=1
+    else
+        echo "OK: $(basename "$orgfile")" >&2
+    fi
+done
+
+if [ "$FAILED" -eq 1 ]; then
+    echo "" >&2
+    echo "COMMIT REJECTED: REPL compilation check failed." >&2
+    echo "Fix errors, or bypass with: git commit --no-verify" >&2
+    exit 1
+fi