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fix(proxy): stop litellm/proxy from shadowing installed packages on sys.path (#34656)

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Running the proxy as a script (python litellm/proxy/proxy_cli.py) puts
litellm/proxy at sys.path[0], so `import a2a` resolved to the internal
litellm/proxy/a2a package instead of the a2a SDK. The optional-import guard in
litellm/a2a_protocol/card_resolver.py swallowed the resulting ModuleNotFoundError
and left its None fallback in place, so the module-level class statement raised
TypeError: NoneType takes no arguments and every proxied A2A agent call failed
with JSON-RPC -32603.

Move the script directory to the end of sys.path instead of removing it; the
sibling-import fallbacks in proxy_cli (from proxy_server import ...) still
need the entry to resolve.

Co-authored-by: Yassin Kortam <yassin.kortam@gmail.com>
This commit is contained in:
Yassin Kortam 2026-07-25 14:20:35 -07:00 • committed by GitHub
parent 998a372417
commit df1f9fa367
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16
litellm/proxy/proxy_cli.py
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@ -23,6 +23,22 @@ if TYPE_CHECKING:
else:
FastAPI = Any
def _deprioritize_script_dir_in_sys_path() -> None:
"""Stop ``litellm/proxy`` modules from shadowing installed packages.
Running this file as a script puts its own directory at ``sys.path[0]``, so
``import a2a`` resolves to ``litellm/proxy/a2a`` instead of the ``a2a`` SDK
and A2A agent calls fail. The entry is moved to the end rather than dropped,
because the sibling-import fallbacks in this module (``from proxy_server
import ...``) still need it. No-op under the ``litellm`` console script.
"""
script_dir = os.path.dirname(os.path.abspath(__file__))
if sys.path and os.path.abspath(sys.path[0]) == script_dir:
sys.path.append(sys.path.pop(0))
_deprioritize_script_dir_in_sys_path()
sys.path.append(os.getcwd())
config_filename = "litellm.secrets"