Add support for Python 3.15 (#3688)

Author: Kludex

.github/workflows/shared.yml

@@ -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"
@@ -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
 
       - name: Install the project
         run: uv sync ${{ matrix.dep-resolution.install-flags }} --all-extras --python ${{ matrix.python-version }}

pyproject.toml

@@ -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"]
@@ -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
@@ -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'",
+    "pydantic>=2.12.0; python_version < '3.15'",
     "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",

src/mcp-types/pyproject.toml

@@ -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",
 ]
 

tests/conftest.py

@@ -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(