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Kludex merged 2 commits into from
Oct 12, 2026
+644 −187
Merged

Add support for Python 3.15 #3688

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830b55e
Add support for Python 3.15
Kludex Oct 12, 2026
64ce058
Remove redundant Python version range from installation docs
Kludex Oct 12, 2026
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4 changes: 2 additions & 2 deletions .github/workflows/shared.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ jobs:
strategy:
fail-fast: false
matrix:
python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
dep-resolution:
- name: lowest-direct
install-flags: "--upgrade --resolution lowest-direct"
Expand All @@ -72,7 +72,7 @@ jobs:
uses: astral-sh/setup-uv@bec219d24cd3e171d82865faccec33120bb574f4 # v10.1.0
with:
enable-cache: true
version: 0.9.5
version: 0.12.24

@cubic-dev-ai cubic-dev-ai Bot Oct 12, 2026

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P1: The lockfile now uses revision 5, but the other jobs in this workflow still install uv 0.9.5 and run frozen syncs; those jobs will fail to read it. Upgrade the remaining lockfile-consuming jobs to a uv version that supports this revision.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At .github/workflows/shared.yml, line 75:

<comment>The lockfile now uses revision 5, but the other jobs in this workflow still install uv 0.9.5 and run frozen syncs; those jobs will fail to read it. Upgrade the remaining lockfile-consuming jobs to a uv version that supports this revision.</comment>

<file context>
@@ -72,7 +72,7 @@ jobs:
         with:
           enable-cache: true
-          version: 0.9.5
+          version: 0.12.24
 
       - name: Install the project
</file context>


- name: Install the project
run: uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}
Expand Down
13 changes: 9 additions & 4 deletions pyproject.toml
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Expand Up @@ -23,6 +23,7 @@ classifiers = [
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
"Programming Language :: Python :: 3.14",
"Programming Language :: Python :: 3.15",
]
[project.optional-dependencies]
rich = ["rich>=13.9.4"]
Expand Down Expand Up @@ -73,11 +74,13 @@ dev = [
"inline-snapshot>=0.23.0",
"dirty-equals>=0.9.0",
"coverage[toml]>=7.10.7,<=7.13",
"pillow>=12.0",
"pillow>=12.3; python_version >= '3.15'",
"pillow>=12.0; python_version < '3.15'",
"strict-no-cover",
"logfire>=3.0.0",
"opentelemetry-sdk>=1.39.1",
"blockbuster>=1.5.27",
"blockbuster>=1.5.29; python_version >= '3.15'",
"blockbuster>=1.5.27; python_version < '3.15'",
]
docs = [
# Zensical is the Material team's successor to MkDocs; it natively
Expand Down Expand Up @@ -133,14 +136,16 @@ dependencies = [
"anyio>=4.9; python_version < '3.14'",
"httpx2>=2.10.0",
"mcp-types=={{ version }}",
"pydantic>=2.12.0",
"pydantic>=2.14.0; python_version >= '3.15'",

@cubic-dev-ai cubic-dev-ai Bot Oct 12, 2026

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P2: The frozen lock routes Python 3.15.0rc3 through the <3.15 branch and installs Pydantic 2.12.5, despite this marker requiring 2.14.0. Use a prerelease-aware full-version cutoff in the conditional requirements and regenerate the lock.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At pyproject.toml, line 139:

<comment>The frozen lock routes Python 3.15.0rc3 through the `<3.15` branch and installs Pydantic 2.12.5, despite this marker requiring 2.14.0. Use a prerelease-aware full-version cutoff in the conditional requirements and regenerate the lock.</comment>

<file context>
@@ -133,14 +136,16 @@ dependencies = [
     "httpx2>=2.10.0",
     "mcp-types=={{ version }}",
-    "pydantic>=2.12.0",
+    "pydantic>=2.14.0; python_version >= '3.15'",
+    "pydantic>=2.12.0; python_version < '3.15'",
     "starlette>=0.48.0; python_version >= '3.14'",
</file context>

"pydantic>=2.12.0; python_version < '3.15'",
Comment thread
Kludex marked this conversation as resolved.
"starlette>=0.48.0; python_version >= '3.14'",
"starlette>=0.27; python_version < '3.14'",
"python-multipart>=0.0.9",
"sse-starlette>=3.0.0",
"uvicorn>=0.31.1; sys_platform != 'emscripten'",
"jsonschema>=4.20.0",
"pywin32>=311; sys_platform == 'win32'",
"pywin32>=312; sys_platform == 'win32' and python_version >= '3.15'",
"pywin32>=311; sys_platform == 'win32' and python_version < '3.15'",
"pyjwt[crypto]>=2.10.1",
"typing-extensions>=4.13.0",
"typing-inspection>=0.4.1",
Expand Down
4 changes: 3 additions & 1 deletion src/mcp-types/pyproject.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,11 @@ classifiers = [
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
"Programming Language :: Python :: 3.14",
"Programming Language :: Python :: 3.15",
]
dependencies = [
"pydantic>=2.12.0",
"pydantic>=2.14.0; python_version >= '3.15'",
"pydantic>=2.12.0; python_version < '3.15'",
"typing-extensions>=4.13.0",
]

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4 changes: 2 additions & 2 deletions tests/conftest.py
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Expand Up @@ -35,8 +35,8 @@ def blockbuster() -> Iterator[None]:
bb.functions["os.stat"].can_block_in("coverage/python.py", "get_python_source")
bb.functions["io.BufferedReader.read"].can_block_in("coverage/python.py", "read_python_source")
# jsonschema discovers its bundled schemas during its first import.
bb.functions["os.listdir"].can_block_in("/jsonschema_specifications/_core.py", "_schemas")
bb.functions["os.scandir"].can_block_in("/jsonschema_specifications/_core.py", "_schemas")
for name in bb.functions.keys() & {"os.listdir", "os.scandir"}:
bb.functions[name].can_block_in("/jsonschema_specifications/_core.py", "_schemas")
bb.functions["io.TextIOWrapper.read"].can_block_in("/jsonschema_specifications/_core.py", "_schemas")
# These public synchronous conversions read the media file by design.
bb.functions["io.BufferedReader.read"].can_block_in(
Expand Down
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