diff --git a/scripts/claude_mma_exec.py b/scripts/claude_mma_exec.py
index 18fe8cf..6528aa2 100644
--- a/scripts/claude_mma_exec.py
+++ b/scripts/claude_mma_exec.py
@@ -197,6 +197,7 @@ def execute_agent(role: str, prompt: str, docs: list[str]) -> str:
  try:
   env = os.environ.copy()
   env['CLAUDE_CLI_HOOK_CONTEXT'] = 'mma_headless'
+  env.pop('ANTHROPIC_API_KEY', None)  # Force CLI to use subscription login, not API key
   process = subprocess.run(
    cmd,
    input=command_text,