A2a Samples - veo_video_gen Running command uv run . --agent http://localhost:10003 getting errors

Hi Team,

I am just starting to work with A2A and working on uv run . --agent http://localhost:10003

Errors details

Will use headers: {}
Traceback (most recent call last):
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_transports/default.py", line 101, in map_httpcore_exceptions
yield
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_transports/default.py", line 394, in handle_async_request
resp = await self._pool.handle_async_request(req)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 256, in handle_async_request
raise exc from None
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 236, in handle_async_request
response = await connection.handle_async_request(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pool_request.request
^^^^^^^^^^^^^^^^^^^^
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_async/connection.py", line 101, in handle_async_request
raise exc
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_async/connection.py", line 78, in handle_async_request
stream = await self._connect(request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_async/connection.py", line 124, in _connect
stream = await self._network_backend.connect_tcp(**kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_backends/auto.py", line 31, in connect_tcp
return await self._backend.connect_tcp(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<5 lines>...
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_backends/anyio.py", line 113, in connect_tcp
with map_exceptions(exc_map):
~~~~~~~~~~~~~~^^^^^^^^^
File "/usr/local/XXXXXX/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/contextlib.py", line 162, in __exit__
self.gen.throw(value)
~~~~~~~~~~~~~~^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpcore/_exceptions.py", line 14, in map_exceptions
raise to_exc(exc) from exc
httpcore.ConnectError: All connection attempts failed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/a2a/client/client.py", line 93, in get_agent_card
response = await self.httpx_client.get(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<2 lines>...
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1768, in get
return await self.request(
^^^^^^^^^^^^^^^^^^^
...<9 lines>...
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1540, in request
return await self.send(request, auth=auth, follow_redirects=follow_redirects)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1629, in send
response = await self._send_handling_auth(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<4 lines>...
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1657, in _send_handling_auth
response = await self._send_handling_redirects(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<3 lines>...
)
^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1694, in _send_handling_redirects
response = await self._send_single_request(request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_client.py", line 1730, in _send_single_request
response = await transport.handle_async_request(request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_transports/default.py", line 393, in handle_async_request
with map_httpcore_exceptions():
~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/local/XXXXXX/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/contextlib.py", line 162, in __exit__
self.gen.throw(value)
~~~~~~~~~~~~~~^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/httpx/_transports/default.py", line 118, in map_httpcore_exceptions
raise mapped_exc(message) from exc
httpx.ConnectError: All connection attempts failed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "", line 198, in _run_module_as_main
File "", line 88, in _run_code
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/hosts/cli/__main__.py", line 262, in
asyncio.run(cli())
~~~^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/asyncclick/core.py", line 1211, in __call__
return anyio.run(self._main, main, args, kwargs, **opts)
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/anyio/_core/_eventloop.py", line 74, in run
return async_backend.run(func, args, {}, backend_options)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/anyio/_backends/_asyncio.py", line 2310, in run
return runner.run(wrapper())
~~~~~~~~~~^^^^^^^^^^^
File "/usr/local/XXXXXX/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 118, in run
return self._loop.run_until_complete(task)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/usr/local/XXXXXX/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
return future.result()
~~~~~~~~~~~~~^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/anyio/_backends/_asyncio.py", line 2298, in wrapper
return await func(*args)
^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/asyncclick/core.py", line 1214, in _main
return await main(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/asyncclick/core.py", line 1126, in main
rv = await self.invoke(ctx)
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/asyncclick/core.py", line 1496, in invoke
return await ctx.invoke(self.callback, **ctx.params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/asyncclick/core.py", line 829, in invoke
rv = await rv
^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/hosts/cli/__main__.py", line 52, in cli
card = await card_resolver.get_agent_card()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/XXXXXX/A2aAgent/a2a-samples/samples/python/.venv/lib/python3.13/site-packages/a2a/client/client.py", line 115, in get_agent_card
raise A2AClientHTTPError(
...<2 lines>...
) from e
a2a.client.errors.A2AClientHTTPError: HTTP Error 503: Network communication error fetching agent card from http://localhost:10003/.well-known/agent.json: All connection attempts failed

Appreciate any help or suggestions , sorry if its a duplicate query

The error is a connection failure to http://localhost:10003. Check if the A2A agent is running locally on port 10003. Look at the CLI entry point in hosts/cli/__main__.py and the client code in a2a/client/client.py. Verify network connectivity and agent configuration. Running the sample may require starting the agent server first.

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