diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..915ed25
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,41 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Tests / Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - "3.9"
+          - "3.10"
+          - "3.11"
+          - "3.12"
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install package
+        run: python -m pip install -U pip && python -m pip install ".[dev]"
+
+      - name: Run tests
+        run: python -m pytest -q
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 0000000..084d5ea
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,125 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+  workflow_dispatch:
+
+env:
+  PYPI_PROJECT_NAME: agent-ref
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.11"
+          cache: pip
+          cache-dependency-path: pyproject.toml
+
+      - name: Install build dependencies
+        run: python -m pip install -U pip build twine
+
+      - name: Verify package name
+        run: |
+          python - <<'PY'
+          import os
+          import tomllib
+
+          expected = os.environ["PYPI_PROJECT_NAME"]
+          with open("pyproject.toml", "rb") as file:
+              actual = tomllib.load(file)["project"]["name"]
+
+          if actual != expected:
+              raise SystemExit(
+                  f"pyproject.toml project.name is {actual!r}, expected {expected!r}"
+              )
+          PY
+
+      - name: Verify tag version
+        if: github.ref_type == 'tag'
+        run: |
+          python - <<'PY'
+          import os
+          import tomllib
+
+          tag = os.environ["GITHUB_REF_NAME"]
+          with open("pyproject.toml", "rb") as file:
+              version = tomllib.load(file)["project"]["version"]
+
+          expected = f"v{version}"
+          if tag != expected:
+              raise SystemExit(
+                  f"tag {tag!r} does not match pyproject.toml version {version!r}; "
+                  f"expected {expected!r}"
+              )
+          PY
+
+      - name: Run tests
+        run: python -m pip install ".[dev]" && python -m pytest -q
+
+      - name: Build package
+        run: python -m build
+
+      - name: Check package metadata
+        run: python -m twine check dist/*
+
+      - name: Upload distributions
+        uses: actions/upload-artifact@v7
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-pypi:
+    name: Publish to PyPI
+    needs: build
+    if: github.ref_type == 'tag'
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/project/agent-ref/
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Download distributions
+        uses: actions/download-artifact@v7
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Publish package
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+  create-github-release:
+    name: Create GitHub release
+    needs: publish-to-pypi
+    if: github.ref_type == 'tag'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Download distributions
+        uses: actions/download-artifact@v7
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Create release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh release create "${GITHUB_REF_NAME}" dist/* --generate-notes