fix(webapp-testing): prevent pipe buffer deadlock and ensure process group cleanup in with_server.py (#1625) - #1664
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…group cleanup in with_server.py (anthropics#1625)
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Fixes #1625
In
skills/webapp-testing/scripts/with_server.py:stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULLto prevent pipe buffer exhaustion and deadlock for verbose background servers.start_new_session=Trueto spawn servers in isolated process groups and kill the entire process group withos.killpg(os.getpgid(process.pid), ...)during cleanup.cc @98zc5g5jyw-arch for review