diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..489d7be
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,75 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build release artifacts
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Verify release tag matches package version
+        shell: bash
+        run: |
+          set -euo pipefail
+          tag="${GITHUB_REF_NAME#v}"
+          version="$(python - <<'PY'
+          import tomllib
+          from pathlib import Path
+          data = tomllib.loads(Path("pyproject.toml").read_text(encoding="utf-8"))
+          print(data["project"]["version"])
+          PY
+          )"
+          echo "tag=$tag package=$version"
+          test "$tag" = "$version"
+
+      - name: Build and inspect package
+        run: |
+          python -m pip install --upgrade build twine
+          python -m build
+          python -m twine check dist/*
+
+      - name: Smoke-test built wheel
+        shell: bash
+        run: |
+          set -euo pipefail
+          python -m venv /tmp/counterproof-release
+          /tmp/counterproof-release/bin/pip install dist/*.whl
+          /tmp/counterproof-release/bin/counterproof --help >/tmp/counterproof-help.txt
+          grep -q 'CounterProof\|Counterproof' /tmp/counterproof-help.txt
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+          if-no-files-found: error
+          retention-days: 7
+
+  publish:
+    name: Publish to PyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/counterproof
+    permissions:
+      id-token: write
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+      - name: Publish package distributions to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/docs/RELEASING.md b/docs/RELEASING.md
new file mode 100644
index 0000000..f7914c0
--- /dev/null
+++ b/docs/RELEASING.md
@@ -0,0 +1,51 @@
+# Releasing CounterProof
+
+CounterProof publishes Python distributions through PyPI Trusted Publishing. The release workflow uses GitHub OIDC and does not store a long-lived PyPI API token.
+
+## One-time setup
+
+Before the first release:
+
+1. In GitHub, create an environment named `pypi`.
+2. In PyPI account settings, add a **pending GitHub publisher** with:
+   - PyPI project name: `counterproof`
+   - Owner: `hippoley`
+   - Repository: `CounterProof`
+   - Workflow filename: `release.yml`
+   - Environment: `pypi`
+3. Keep the GitHub environment restricted to maintainers you trust. Requiring approval for the environment is recommended when available.
+
+A pending publisher does not reserve the package name until the first successful publish, so do not treat setup alone as ownership of `counterproof`.
+
+## Release procedure
+
+1. Update `project.version` in `pyproject.toml`.
+2. Merge all intended release changes to `main`.
+3. Confirm main CI is green.
+4. Create a GitHub Release whose tag is exactly `v<project.version>`, for example `v0.2.0`.
+5. Publishing the GitHub Release triggers `.github/workflows/release.yml`.
+
+The workflow refuses to publish if the release tag and `pyproject.toml` version disagree.
+
+## What the workflow verifies
+
+Before uploading anything, it:
+
+- builds both source and wheel distributions;
+- runs `twine check`;
+- installs the built wheel into a clean virtual environment;
+- verifies the installed `counterproof` CLI is present.
+
+Only the publish job receives `id-token: write`, and that job is bound to the `pypi` GitHub environment.
+
+## After publishing
+
+Verify:
+
+```bash
+python -m pip install --upgrade counterproof
+counterproof --help
+counterproof doctor
+```
+
+Then update README installation examples from the GitHub URL to `pip install counterproof` only after the PyPI release is actually available.
diff --git a/pyproject.toml b/pyproject.toml
index 39506ea..7b8c681 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "counterproof"
 version = "0.2.0"
-description = "Prove agent PR fixes by replaying changed tests against pre-change code."
+description = "Prove AI-assisted PR claims with replayable BASE-to-HEAD evidence and scoped receipts."
 readme = "README.md"
 license = "Apache-2.0"
 authors = [{ name = "hippoley" }]