feat: add support for stateless MCP 2026 draft and protocol negotiation fallback - #699

starting build "4148c222-d674-4099-9365-4cff606339f3"

FETCHSOURCE

From https://github.com/googleapis/mcp-toolbox-sdk-python
 * branch            e0c772cf3cac93ad3eb513be5325726e465f111d -> FETCH_HEAD
HEAD is now at e0c772c feat: support user-defined fallback protocols array (#707)
GitCommit:
e0c772cf3cac93ad3eb513be5325726e465f111d
BUILD
Starting Step #0 - "Install requirements"
Step #0 - "Install requirements": Pulling image: python:3.14
Step #0 - "Install requirements": 3.14: Pulling from library/python
Step #0 - "Install requirements": Digest: sha256:09b29c360b84742bf98eba40b214f7f6b4b53286bb2c8a8b5b1afa188a8d9c0e
Step #0 - "Install requirements": Status: Downloaded newer image for python:3.14
Step #0 - "Install requirements": docker.io/library/python:3.14
Step #0 - "Install requirements": Collecting uv
Step #0 - "Install requirements":   Downloading uv-0.11.28-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (11 kB)
Step #0 - "Install requirements": Downloading uv-0.11.28-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (27.1 MB)
Step #0 - "Install requirements":    ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 27.1/27.1 MB 128.1 MB/s  0:00:00
Step #0 - "Install requirements": Installing collected packages: uv
Step #0 - "Install requirements": Successfully installed uv-0.11.28
Step #0 - "Install requirements": WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager, possibly rendering your system unusable. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv. Use the --root-user-action option if you know what you are doing and want to suppress this warning.
Step #0 - "Install requirements": Using CPython 3.14.6 interpreter at: /usr/local/bin/python3
Step #0 - "Install requirements": Creating virtual environment at: /workspace/venv
Step #0 - "Install requirements": Activate with: source /workspace/venv/bin/activate
Step #0 - "Install requirements": Using Python 3.14.6 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 1 package in 248ms
Step #0 - "Install requirements": Downloading uv (25.9MiB)
Step #0 - "Install requirements":  Downloaded uv
Step #0 - "Install requirements": Prepared 1 package in 645ms
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 1 package in 66ms
Step #0 - "Install requirements":  + uv==0.11.28
Step #0 - "Install requirements": Using Python 3.14.6 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 47 packages in 2.25s
Step #0 - "Install requirements":    Building toolbox-core @ file:///workspace/packages/toolbox-core
Step #0 - "Install requirements": Downloading aiohttp (1.7MiB)
Step #0 - "Install requirements": Downloading pydantic-core (2.0MiB)
Step #0 - "Install requirements": Downloading zstandard (5.3MiB)
Step #0 - "Install requirements": Downloading cryptography (4.5MiB)
Step #0 - "Install requirements":  Downloaded aiohttp
Step #0 - "Install requirements":       Built toolbox-core @ file:///workspace/packages/toolbox-core
Step #0 - "Install requirements":  Downloaded pydantic-core
Step #0 - "Install requirements":  Downloaded zstandard
Step #0 - "Install requirements":  Downloaded cryptography
Step #0 - "Install requirements": Prepared 47 packages in 846ms
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 47 packages in 197ms
Step #0 - "Install requirements":  + aiohappyeyeballs==2.7.1
Step #0 - "Install requirements":  + aiohttp==3.14.1
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Step #0 - "Install requirements": Using Python 3.14.6 environment at: /workspace/venv
Step #0 - "Install requirements": Resolved 96 packages in 1.79s
Step #0 - "Install requirements":    Building toolbox-langchain @ file:///workspace/packages/toolbox-langchain
Step #0 - "Install requirements": Downloading ast-serialize (1.2MiB)
Step #0 - "Install requirements": Downloading mypy (14.3MiB)
Step #0 - "Install requirements": Downloading grpcio (6.6MiB)
Step #0 - "Install requirements": Downloading pygments (1.2MiB)
Step #0 - "Install requirements": Downloading pillow (6.8MiB)
Step #0 - "Install requirements": Downloading black (1.8MiB)
Step #0 - "Install requirements": Downloading jedi (4.7MiB)
Step #0 - "Install requirements":       Built toolbox-langchain @ file:///workspace/packages/toolbox-langchain
Step #0 - "Install requirements":  Downloaded ast-serialize
Step #0 - "Install requirements":  Downloaded black
Step #0 - "Install requirements":  Downloaded pillow
Step #0 - "Install requirements":  Downloaded grpcio
Step #0 - "Install requirements":  Downloaded pygments
Step #0 - "Install requirements":  Downloaded mypy
Step #0 - "Install requirements":  Downloaded jedi
Step #0 - "Install requirements":    Building numpy==1.26.4
Step #0 - "Install requirements":       Built numpy==1.26.4
Step #0 - "Install requirements": Prepared 49 packages in 9m 24s
Step #0 - "Install requirements": warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
Step #0 - "Install requirements":          If the cache and target directories are on different filesystems, hardlinking may not be supported.
Step #0 - "Install requirements":          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
Step #0 - "Install requirements": Installed 49 packages in 921ms
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Step #0 - "Install requirements":  + asttokens==3.0.1
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Step #0 - "Install requirements":  + toolbox-langchain==1.0.1 (from file:///workspace/packages/toolbox-langchain)
Step #0 - "Install requirements":  + traitlets==5.15.1
Step #0 - "Install requirements":  + wcwidth==0.8.2
Finished Step #0 - "Install requirements"
Starting Step #1 - "Run integration tests"
Step #1 - "Run integration tests": Already have image (with digest): python:3.14
Step #1 - "Run integration tests": ============================= test session starts ==============================
Step #1 - "Run integration tests": platform linux -- Python 3.14.6, pytest-9.0.3, pluggy-1.6.0
Step #1 - "Run integration tests": rootdir: /workspace/packages/toolbox-langchain
Step #1 - "Run integration tests": configfile: pyproject.toml
Step #1 - "Run integration tests": plugins: langsmith-0.10.0, cov-7.1.0, asyncio-1.4.0, anyio-4.14.1
Step #1 - "Run integration tests": asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
Step #1 - "Run integration tests": collected 120 items
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_async_client.py .................                             [ 14%]
Step #1 - "Run integration tests": tests/test_async_tools.py ..................                             [ 29%]
Step #1 - "Run integration tests": tests/test_client.py ...............                                     [ 41%]
Step #1 - "Run integration tests": tests/test_e2e.py ...................................................... [ 86%]
Step #1 - "Run integration tests": ......                                                                   [ 91%]
Step #1 - "Run integration tests": tests/test_tools.py ..........                                           [100%]
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": =============================== warnings summary ===============================
Step #1 - "Run integration tests": tests/test_async_tools.py: 3 warnings
Step #1 - "Run integration tests": tests/test_e2e.py: 16 warnings
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/src/toolbox_core/utils.py:165: DeprecationWarning: 'asyncio.iscoroutinefunction' is deprecated and slated for removal in Python 3.16; use inspect.iscoroutinefunction() instead
Step #1 - "Run integration tests":     if asyncio.iscoroutinefunction(source):
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": tests/test_e2e.py: 20 warnings
Step #1 - "Run integration tests":   /workspace/packages/toolbox-core/src/toolbox_core/utils.py:56: UserWarning: This connection is using HTTP. To prevent credential exposure, please ensure all communication is sent over HTTPS.
Step #1 - "Run integration tests":     warnings.warn(
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
Step #1 - "Run integration tests": ================================ tests coverage ================================
Step #1 - "Run integration tests": _______________ coverage: platform linux, python 3.14.6-final-0 ________________
Step #1 - "Run integration tests": 
Step #1 - "Run integration tests": Name                                    Stmts   Miss  Cover
Step #1 - "Run integration tests": -----------------------------------------------------------
Step #1 - "Run integration tests": src/toolbox_langchain/__init__.py           3      0   100%
Step #1 - "Run integration tests": src/toolbox_langchain/async_client.py      49      3    94%
Step #1 - "Run integration tests": src/toolbox_langchain/async_tools.py       29      4    86%
Step #1 - "Run integration tests": src/toolbox_langchain/client.py            78      8    90%
Step #1 - "Run integration tests": src/toolbox_langchain/tools.py             30      2    93%
Step #1 - "Run integration tests": src/toolbox_langchain/version.py            1      0   100%
Step #1 - "Run integration tests": -----------------------------------------------------------
Step #1 - "Run integration tests": TOTAL                                     190     17    91%
Step #1 - "Run integration tests": Required test coverage of 90% reached. Total coverage: 91.05%
Step #1 - "Run integration tests": ====================== 120 passed, 39 warnings in 10.66s =======================
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