ci: gate langchain CD on uv resolvability, not just PyPI simple index

.github/workflows/cd-langchain.yml

@@ -23,6 +23,17 @@ jobs:
         with:
           fetch-depth: 2
 
+      - name: Setup uv
+        uses: astral-sh/setup-uv@v7
+        with:
+          version: "0.9.27"
+          enable-cache: true
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v6
+        with:
+          python-version-file: ".python-version"
+
       - name: Wait for uipath-llm-client publish
         if: github.event_name == 'push'
         env:
@@ -44,21 +55,26 @@ jobs:
 
             case "$STATUS" in
               completed:success)
-                echo "cd workflow succeeded — polling PyPI until uipath-llm-client==$CORE_VERSION is available..."
+                echo "cd workflow succeeded — verifying uv can resolve uipath-llm-client==$CORE_VERSION from PyPI..."
+                # Use uv itself as the readiness check (not curl). The setup-uv action
+                # restores uv's metadata cache across job runs, so the simple-index entry
+                # for uipath-llm-client may be stale (without the new version). Polling
+                # pypi.org/simple/ with curl proves only that PyPI knows about the version,
+                # not that uv will see it. --refresh-package invalidates uv's cache for
+                # this specific project and forces a fresh fetch each attempt. Retry rides
+                # out PyPI CDN propagation across Fastly edges (a fresh publish can be
+                # visible on one edge but stale on another for tens of seconds).
                 for j in $(seq 1 40); do
-                  # Query the simple index directly with Cache-Control: no-cache so Fastly
-                  # revalidates with origin on every request. PyPI purges the per-project
-                  # simple page within seconds of a publish, so uv's local cache (max-age=600)
-                  # would otherwise serve a stale miss for up to 10 minutes.
-                  if curl -sf -H "Cache-Control: no-cache" \
-                      "https://pypi.org/simple/uipath-llm-client/" | grep -q "$CORE_VERSION"; then
-                    echo "uipath-llm-client==$CORE_VERSION is available on PyPI."
+                  if uv pip install --dry-run --system --no-deps \
+                      --refresh-package uipath-llm-client \
+                      "uipath-llm-client==$CORE_VERSION" >/dev/null 2>&1; then
+                    echo "uv can resolve uipath-llm-client==$CORE_VERSION from PyPI."
                     exit 0
                   fi
-                  echo "  Not yet available, retrying in 15s ($j/40)..."
+                  echo "  Not yet resolvable by uv, retrying in 15s ($j/40)..."
                   sleep 15
                 done
-                echo "::error::uipath-llm-client==$CORE_VERSION never appeared on PyPI (10 min)"
+                echo "::error::uipath-llm-client==$CORE_VERSION never became resolvable on PyPI (10 min)"
                 exit 1
                 ;;
               completed:*)
@@ -73,17 +89,6 @@ jobs:
           echo "::error::Timed out waiting for cd workflow (15 min)"
           exit 1
 
-      - name: Setup uv
-        uses: astral-sh/setup-uv@v7
-        with:
-          version: "0.9.27"
-          enable-cache: true
-
-      - name: "Set up Python"
-        uses: actions/setup-python@v6
-        with:
-          python-version-file: ".python-version"
-
       - name: "Install dependencies"
         run: uv sync --dev --all-extras --locked
 
@@ -93,12 +98,14 @@ jobs:
       - name: Smoke test (wheel with all extras)
         run: |
           WHEEL=$(ls dist/*.whl)
-          uv run --isolated --no-project --with "${WHEEL}[all]" tests/langchain/smoke_test.py
+          uv run --isolated --no-project --refresh-package uipath-llm-client \
+            --with "${WHEEL}[all]" tests/langchain/smoke_test.py
 
       - name: Smoke test (source distribution with all extras)
         run: |
           SDIST=$(ls dist/*.tar.gz)
-          uv run --isolated --no-project --with "${SDIST}[all]" tests/langchain/smoke_test.py
+          uv run --isolated --no-project --refresh-package uipath-llm-client \
+            --with "${SDIST}[all]" tests/langchain/smoke_test.py
 
       - name: Publish package
         run: uv publish