diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..357434a
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,70 @@
+name: release
+
+# Triggers PyPI publish when a tag matching `v*` is pushed.
+# Uses PyPI trusted-publisher (OIDC) so no secrets need to live in
+# this repo. Setup, one-time, on PyPI side:
+#   pypi.org → manage cacp-protocol → publishing → add trusted publisher
+#     owner: zenprocess
+#     repository: cacp
+#     workflow: release.yml
+#     environment: pypi
+#
+# Fallback: if trusted-publisher is not configured, the upload step
+# fails with a loud "trusted publisher not registered" error. Add
+# `PYPI_API_TOKEN` as a repo secret and replace the `with:` block on
+# the publish step with `password: ${{ secrets.PYPI_API_TOKEN }}` to
+# unblock without OIDC.
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build sdist + wheel
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: cacp-python
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Install build tooling
+        run: python -m pip install --upgrade pip build
+      - name: Build distributions
+        run: python -m build
+      - name: Verify version matches the tag
+        run: |
+          set -eu
+          DIST_VERSION=$(python -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
+          TAG_VERSION="${GITHUB_REF_NAME#v}"
+          if [ "$DIST_VERSION" != "$TAG_VERSION" ]; then
+            echo "::error::pyproject version $DIST_VERSION does not match tag v$TAG_VERSION"
+            exit 1
+          fi
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: cacp-python/dist/
+
+  publish:
+    name: Publish to PyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write  # required for trusted-publisher OIDC
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+      - uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages-dir: dist/
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c18dd8d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__/
diff --git a/cacp-python/README.md b/cacp-python/README.md
index 4561a33..9cbc6a8 100644
--- a/cacp-python/README.md
+++ b/cacp-python/README.md
@@ -1,14 +1,18 @@
-# cacp — Reference Python parser for CACP
+# cacp-protocol — Reference Python parser for CACP
 
 Canonical Python reference implementation of [CACP (Compressed Agent
 Communication Protocol)](https://github.com/zenprocess/cacp). The spec
 lives in the parent [`README.md`](../README.md); this package implements
 the parser against it.
 
+> **Naming**: distributed on PyPI as `cacp-protocol` (the unprefixed
+> `cacp` slot was already taken by an unrelated project — Classification
+> Algorithms Comparison Pipeline). Imports as `cacp_protocol`.
+
 ## Install
 
 ```
-pip install cacp
+pip install cacp-protocol
 ```
 
 Zero runtime dependencies — pure stdlib.
@@ -16,7 +20,7 @@ Zero runtime dependencies — pure stdlib.
 ## Usage
 
 ```python
-from cacp import parse
+from cacp_protocol import parse
 
 text = open("agent_response.txt").read()
 response = parse(text)
diff --git a/cacp-python/pyproject.toml b/cacp-python/pyproject.toml
index f9f6e85..b78cb1f 100644
--- a/cacp-python/pyproject.toml
+++ b/cacp-python/pyproject.toml
@@ -1,5 +1,5 @@
 [project]
-name = "cacp"
+name = "cacp-protocol"
 version = "0.1.0"
 description = "Reference Python parser for CACP (Compressed Agent Communication Protocol)"
 readme = "README.md"
diff --git a/cacp-python/src/cacp/__init__.py b/cacp-python/src/cacp_protocol/__init__.py
similarity index 82%
rename from cacp-python/src/cacp/__init__.py
rename to cacp-python/src/cacp_protocol/__init__.py
index ea098cf..1823555 100644
--- a/cacp-python/src/cacp/__init__.py
+++ b/cacp-python/src/cacp_protocol/__init__.py
@@ -3,8 +3,8 @@
 See the canonical spec at https://github.com/zenprocess/cacp.
 """
 
-from cacp.parser import parse
-from cacp.models import (
+from cacp_protocol.parser import parse
+from cacp_protocol.models import (
     CACPResponse,
     CANONICAL_STATUS_VALUES,
     CANONICAL_TESTS_BUILD_VALUES,
diff --git a/cacp-python/src/cacp/models.py b/cacp-python/src/cacp_protocol/models.py
similarity index 100%
rename from cacp-python/src/cacp/models.py
rename to cacp-python/src/cacp_protocol/models.py
diff --git a/cacp-python/src/cacp/parser.py b/cacp-python/src/cacp_protocol/parser.py
similarity index 99%
rename from cacp-python/src/cacp/parser.py
rename to cacp-python/src/cacp_protocol/parser.py
index aed1d4c..53460fe 100644
--- a/cacp-python/src/cacp/parser.py
+++ b/cacp-python/src/cacp_protocol/parser.py
@@ -17,7 +17,7 @@
 
 import re
 
-from cacp.models import (
+from cacp_protocol.models import (
     CACPResponse,
     CANONICAL_STATUS_VALUES,
     CANONICAL_TESTS_BUILD_VALUES,
diff --git a/cacp-python/tests/test_conformance.py b/cacp-python/tests/test_conformance.py
index a0953a9..a6fa59b 100644
--- a/cacp-python/tests/test_conformance.py
+++ b/cacp-python/tests/test_conformance.py
@@ -9,7 +9,7 @@
 
 import pytest
 
-from cacp import (
+from cacp_protocol import (
     CANONICAL_STATUS_VALUES,
     CANONICAL_TESTS_BUILD_VALUES,
     parse,
diff --git a/cacp-python/tests/test_roundtrip.py b/cacp-python/tests/test_roundtrip.py
index 722527f..68ce0a5 100644
--- a/cacp-python/tests/test_roundtrip.py
+++ b/cacp-python/tests/test_roundtrip.py
@@ -7,7 +7,7 @@
 
 from __future__ import annotations
 
-from cacp import parse
+from cacp_protocol import parse
 
 
 # Verbatim copy of the response example in the parent README.md (§"Response