fix

.gitignore

@@ -26,3 +26,4 @@ result-*
 
 # Local environment overrides
 .envrc.local
+/.dir-locals.el

opencode.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "mcp": {
+    "nixos": {
+      "type": "local",
+      "command": ["mcp-nixos"],
+      "enabled": true
+    },
+    "manim": {
+      "type": "local",
+      "command": ["manim-mcp-server"],
+      "enabled": true
+    }
+  }
+}

packages/manim-mcp-server/package.nix

@@ -34,7 +34,13 @@ stdenv.mkDerivation rec {
     runHook preInstall
 
     mkdir -p $out/bin $out/lib/manim-mcp-server
-    cp src/manim_server.py $out/lib/manim-mcp-server/
+
+    # Patch manim_server.py to use a configurable media directory
+    # The original code uses a path relative to __file__ which fails in the read-only Nix store
+    substitute src/manim_server.py $out/lib/manim-mcp-server/manim_server.py \
+      --replace-fail \
+        'BASE_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "media")' \
+        'BASE_DIR = os.getenv("MANIM_MCP_MEDIA_DIR", os.path.join(os.path.expanduser("~"), ".cache", "manim-mcp-server", "media"))'
 
     makeWrapper ${python}/bin/python $out/bin/manim-mcp-server \
       --add-flags "$out/lib/manim-mcp-server/manim_server.py" \