diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bbfc0e5..e05836f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -363,58 +363,23 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.13.1t"]
-        include:
-          - os: ubuntu-latest
-            python-version: "3.13"
-          - os: ubuntu-latest
-            python-version: "3.14.0rc2"
-          - os: ubuntu-latest
-            python-version: "3.14.0rc2t"
-          - os: ubuntu-latest
-            python-version: "pypy3.11"
     steps:
       - name: Install latest version
         id: setup-uv
         uses: $/
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: 3.13.1t
           activate-environment: true
-          enable-cache: true
       - name: Verify packages can be installed
         run: uv pip install pip
         shell: bash
-      - name: Verify Python version outputs and cache key
+      - name: Verify python version is correct
         run: |
-          expected_prefix=$(python -I - <<'PY'
-          import platform
-          import sys
-          import sysconfig
-
-          runtime = f"{sys.implementation.name}-{platform.python_version()}"
-          if sysconfig.get_config_var("Py_GIL_DISABLED") == 1:
-              runtime += "+freethreaded"
-          print(f"{runtime}-")
-          PY
-          )
-          case "$PYTHON_RUNTIME_ID" in
-            "$expected_prefix"*) ;;
-            *) echo "Wrong Python runtime ID: $PYTHON_RUNTIME_ID (expected prefix $expected_prefix)"; exit 1 ;;
-          esac
-          if [ "$PYTHON_VERSION" != "$PYTHON_REQUEST" ]; then
-            echo "Wrong requested Python version: $PYTHON_VERSION"
+          python --version
+          if [ "$(python --version)" != "Python 3.13.1" ]; then
             exit 1
           fi
-          case "$CACHE_KEY" in
-            *-"$PYTHON_REQUEST"-*) ;;
-            *) echo "Cache key no longer contains requested Python version: $CACHE_KEY"; exit 1 ;;
-          esac
         shell: bash
-        env:
-          CACHE_KEY: ${{ steps.setup-uv.outputs.cache-key }}
-          PYTHON_REQUEST: ${{ matrix.python-version }}
-          PYTHON_VERSION: ${{ steps.setup-uv.outputs.python-version }}
-          PYTHON_RUNTIME_ID: ${{ steps.setup-uv.outputs.python-runtime-id }}
       - name: Verify output venv is set
         run: |
           if [ -z "$UV_VENV" ]; then
diff --git a/README.md b/README.md
index 226ab29..1851422 100644
--- a/README.md
+++ b/README.md
@@ -138,9 +138,7 @@ Have a look under [Advanced Configuration](#advanced-configuration) for detailed
 - `cache-hit`: A boolean value to indicate a cache entry was found.
 - `venv`: Path to the activated venv if activate-environment is true.
 - `python-version`: The Python version that was set.
-- `python-runtime-id`: An opaque identifier reported by uv for the activated venv's Python runtime, including
-  implementation, full Python version, and free-threaded build information. Useful as a cache-key component.
-  Empty when `activate-environment` is false. The action fails if the activated runtime cannot be determined.
+- `python-runtime-id`: An opaque identifier reported by uv for the activated venv's Python runtime. Empty when `activate-environment` is false.
 - `python-cache-hit`: A boolean value to indicate the Python cache entry was found.
 
 ### Python version
diff --git a/action.yml b/action.yml
index 5a8216d..2a51899 100644
--- a/action.yml
+++ b/action.yml
@@ -108,7 +108,7 @@ outputs:
   python-version:
     description: "The Python version that was set."
   python-runtime-id:
-    description: "An opaque identifier reported by uv for the activated venv's Python runtime, including implementation, full Python version, and free-threaded build information. Empty when activate-environment is false. The action fails if the activated runtime cannot be determined."
+    description: "An opaque identifier reported by uv for the activated venv's Python runtime. Empty when activate-environment is false."
   python-cache-hit:
     description: "A boolean value to indicate the Python cache entry was found"
 runs:
diff --git a/docs/environment-and-tools.md b/docs/environment-and-tools.md
index 5b3c07b..c98d356 100644
--- a/docs/environment-and-tools.md
+++ b/docs/environment-and-tools.md
@@ -29,11 +29,6 @@ your cache with `id: setup-uv` on the setup step:
 key: build-${{ runner.os }}-${{ runner.arch }}-${{ steps.setup-uv.outputs.python-runtime-id }}-${{ hashFiles('uv.lock') }}
 ```
 
-The free-threaded marker describes the interpreter's build even when the GIL is
-enabled at runtime. The output is empty when `activate-environment` is false. If
-the activated runtime cannot be determined, the action fails. The existing
-`python-version` output and setup-uv's cache keys are unaffected.
-
 You can customize the venv location with `venv-path`, for example to place it in the runner temp directory:
 
 ```yaml
diff --git a/src/utils/python-runtime.ts b/src/utils/python-runtime.ts
index e1bdbe5..c44b49e 100644
--- a/src/utils/python-runtime.ts
+++ b/src/utils/python-runtime.ts
@@ -10,6 +10,8 @@ export async function getPythonRuntimeId(inputs: SetupInputs): Promise<string> {
   }
 
   try {
+    // The venv path restricts results to this invocation's runtime, even if
+    // earlier setup-uv calls installed other Python versions in the same job.
     const { stdout } = await execFileAsync(
       "uv",
       [