diff --git a/emsdk.py b/emsdk.py
index 04b083e..d628d86 100644
--- a/emsdk.py
+++ b/emsdk.py
@@ -1616,6 +1616,10 @@ class Tool(object):
 
     if hasattr(self, 'uses'):
       for tool_name in self.uses:
+        if 'node' in tool_name:
+          continue
+        if 'python' in tool_name:
+          continue
         tool = find_tool(tool_name)
         if not tool:
           debug_print('Tool ' + str(self) + ' depends on ' + tool_name + ' which does not exist!')
@@ -1722,6 +1726,10 @@ class Tool(object):
     # installed for this tool to count as being installed.
     if hasattr(self, 'uses'):
       for tool_name in self.uses:
+        if 'node' in tool_name:
+          continue
+        if 'python' in tool_name:
+          continue
         tool = find_tool(tool_name)
         if tool is None:
           errlog("Manifest error: No tool by name '" + tool_name + "' found! This may indicate an internal SDK error!")
@@ -1857,6 +1865,10 @@ class Tool(object):
     installed = False
 
     for tool_name in self.uses:
+      if 'node' in tool_name:
+        continue
+      if 'python' in tool_name:
+        continue
       tool = find_tool(tool_name)
       if tool is None:
         exit_with_error("Manifest error: No tool by name '" + tool_name + "' found! This may indicate an internal SDK error!")
@@ -1986,6 +1998,10 @@ class Tool(object):
     deps = []
 
     for tool_name in self.uses:
+      if 'node' in tool_name:
+        continue
+      if 'python' in tool_name:
+        continue
       tool = find_tool(tool_name)
       if tool:
         deps += [tool]
@@ -1996,6 +2012,10 @@ class Tool(object):
       return []
     deps = []
     for tool_name in self.uses:
+      if 'node' in tool_name:
+        continue
+      if 'python' in tool_name:
+        continue
       tool = find_tool(tool_name)
       if tool:
         deps += [tool]
@@ -2242,6 +2262,10 @@ def load_sdk_manifest():
 
   def dependencies_exist(sdk):
     for tool_name in sdk.uses:
+      if 'node' in tool_name:
+        continue
+      if 'python' in tool_name:
+        continue
       tool = find_tool(tool_name)
       if not tool:
         debug_print('missing dependency: ' + tool_name)