diff --git a/Dockerfile b/Dockerfile
index 5f12622..bb88217 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,6 +19,7 @@ RUN mkdir -p /build && date -u '+%Y-%m-%d %H:%M UTC' > /build/build-time
 ADD roux-server /usr/local/bin/roux-server
 ADD scripts/scrape-recipe /usr/local/bin/scrape-recipe
 ADD scripts/convert-to-cooklang /usr/local/bin/convert-to-cooklang
+ADD prompts /usr/local/share/roux/prompts/
 
 RUN chmod +x /usr/local/bin/roux-server /usr/local/bin/scrape-recipe /usr/local/bin/convert-to-cooklang
 ENV PATH="/opt/roux-venv/bin:${PATH}"
diff --git a/scripts/convert-to-cooklang b/scripts/convert-to-cooklang
index 48cc6dc..2d97953 100755
--- a/scripts/convert-to-cooklang
+++ b/scripts/convert-to-cooklang
@@ -42,11 +42,30 @@ def load_config(path: str) -> dict:
 def load_prompts() -> tuple[str, str, str]:
     """Load system prompt, converter instructions, and user template.
 
-    Resolved relative to the script's parent directory (project root).
+    Tries locations in order:
+    1. ../prompts/ relative to the script (development from project root)
+    2. /usr/local/share/roux/prompts/ (production Docker deployment)
     """
     script_dir = os.path.dirname(os.path.abspath(__file__))
-    project_root = os.path.dirname(script_dir)  # scripts/ -> project root
-    prompts_dir = os.path.join(project_root, "prompts")
+    candidates = [
+        os.path.join(script_dir, "..", "prompts"),
+        "/usr/local/share/roux/prompts",
+    ]
+
+    prompts_dir = None
+    for candidate in candidates:
+        candidate = os.path.abspath(candidate)
+        if os.path.isdir(candidate):
+            prompts_dir = candidate
+            break
+
+    if prompts_dir is None:
+        print(
+            "Error: prompts directory not found. "
+            "Searched: " + ", ".join(candidates),
+            file=sys.stderr,
+        )
+        sys.exit(1)
 
     def read(name: str) -> str:
         with open(os.path.join(prompts_dir, name)) as f: