diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 0000000..ec58866
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,45 @@
+name: Publish SDKs
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  publish-rust:
+    name: Publish Rust Crate
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: Map Kellnr Host
+        run: |
+          if sudo -n true 2>/dev/null; then
+            echo "192.168.1.2 kellnr.cntm.labs" | sudo tee -a /etc/hosts
+          fi
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+      - name: Setup Protoc
+        uses: arduino/setup-protoc@v3
+      - name: Publish to Kellnr
+        env:
+          SHARED_TOKEN: ${{ secrets.KELLNR_TOKEN }}
+        run: |
+          cargo login --registry vtuber-registry "$SHARED_TOKEN"
+          cargo publish --registry vtuber-registry --allow-dirty
+
+  generate-interop-files:
+    name: Generate Interop Files (Non-Publish)
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup buf
+        uses: bufbuild/buf-setup-action@v1
+        with:
+          version: "1.68.4"
+      - name: Generate Python and TS
+        run: |
+          buf generate --template buf.gen.yaml
+          echo "✅ Interop files generated in 'generated/' folder."
+          echo "ℹ️ Per architectural decision: Only Rust is published to Kellnr."
+          echo "ℹ️ Python/TS are used via cross-repo interop/submodules if needed."
diff --git a/docs/superpowers/plans/2026-05-10-serde-registry-integration.md b/docs/superpowers/plans/2026-05-10-serde-registry-integration.md
index c6f1dec..bfbda47 100644
--- a/docs/superpowers/plans/2026-05-10-serde-registry-integration.md
+++ b/docs/superpowers/plans/2026-05-10-serde-registry-integration.md
@@ -49,3 +49,66 @@
 
 - [ ] **Step 1: Run full test suite (cargo test, pixi run test, buf lint)**
 - [ ] **Step 2: Update STRUCTURE.tree and push changes**
+
+---
+
+### Task 6: Implement Publishing Workflow
+
+**Files:**
+- Create: `.github/workflows/publish.yml`
+
+- [ ] **Step 1: Create publish.yml with Multi-Registry support**
+
+```yaml
+name: Publish SDKs
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  publish-rust:
+    name: Publish Rust Crate
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: Map Kellnr Host
+        run: |
+          if sudo -n true 2>/dev/null; then
+            echo "192.168.1.2 kellnr.cntm.labs" | sudo tee -a /etc/hosts
+          fi
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+      - name: Setup Protoc
+        uses: arduino/setup-protoc@v3
+      - name: Publish to Kellnr
+        env:
+          SHARED_TOKEN: ${{ secrets.KELLNR_TOKEN }}
+        run: |
+          cargo login --registry vtuber-registry "$SHARED_TOKEN"
+          cargo publish --registry vtuber-registry --allow-dirty
+
+  publish-python:
+    name: Publish Python Stubs
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: Map Kellnr Host
+        run: |
+          if sudo -n true 2>/dev/null; then
+            echo "192.168.1.2 kellnr.cntm.labs" | sudo tee -a /etc/hosts
+          fi
+      - name: Setup buf
+        uses: bufbuild/buf-setup-action@v1
+        with:
+          version: "1.68.4"
+      - name: Generate and Publish
+        env:
+          TWINE_USERNAME: __token__
+          TWINE_PASSWORD: ${{ secrets.KELLNR_TOKEN }}
+          TWINE_REPOSITORY_URL: http://kellnr.cntm.labs:31500/api/v1/pypi
+        run: |
+          buf generate
+          # TODO: Add python packaging logic here if needed
diff --git a/docs/superpowers/specs/2026-05-10-serde-registry-integration-design.md b/docs/superpowers/specs/2026-05-10-serde-registry-integration-design.md
index f7e4c09..a68d895 100644
--- a/docs/superpowers/specs/2026-05-10-serde-registry-integration-design.md
+++ b/docs/superpowers/specs/2026-05-10-serde-registry-integration-design.md
@@ -29,3 +29,25 @@ This specification details the implementation of Serde support for all generated
 
 ## ⚖️ Future Considerations
 - Transitioning from manual file copying to BSR (Buf Schema Registry) once the initial local registry flow is stabilized.
+
+## 🚀 Phase 2: Automated SDK Publishing (Issue #4)
+
+### 1. Workflow Architecture
+- **Trigger:** Git tags matching `v*`.
+- **Runner:** `self-hosted` (local lab network).
+- **Environment:** Manual mapping of `192.168.1.2` to `kellnr.cntm.labs` within the workflow.
+
+### 2. Multi-Language Publishing Logic
+- **Rust:** Uses native `cargo publish` with the pre-configured `vtuber-registry`.
+- **Python:** 
+    - Generates code via `buf`.
+    - Packages as a wheel.
+    - Publishes to Kellnr PyPI via `twine`.
+- **TypeScript:**
+    - Generates code via `buf`.
+    - Publishes to Kellnr NPM via `npm publish`.
+- **GitHub Packages:** Parallel steps to publish to `ghcr.io` or GitHub's language-specific registries as a fallback.
+
+### 3. Secrets Required
+- `KELLNR_TOKEN`: For private registry authentication.
+- `GITHUB_TOKEN`: Provided automatically by GitHub Actions.