diff --git a/.github/workflows/e2b-template.yml b/.github/workflows/e2b-template.yml
new file mode 100644
index 00000000..3868f40c
--- /dev/null
+++ b/.github/workflows/e2b-template.yml
@@ -0,0 +1,116 @@
+name: E2B template
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - .github/workflows/e2b-template.yml
+      - scripts/e2b-template.py
+      - Dockerfile.hosted
+      - .dockerignore
+      - hosted-snapshot/**
+      - pyproject.toml
+      - src/**
+
+permissions:
+  contents: read
+
+# Distinct commits get distinct templates; never discard a merge's publication.
+# Serialize reruns of the same commit and let sandbox cleanup finish.
+concurrency:
+  group: e2b-template-${{ github.ref }}-${{ github.sha }}
+  cancel-in-progress: false
+
+env:
+  UV_VERSION: "0.12.9"
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Validate publisher inputs without credentials
+        run: python3 scripts/e2b-template.py --dry-run
+
+  publish:
+    needs: validate
+    if: github.ref == 'refs/heads/main' && github.event_name != 'pull_request'
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Check required credentials
+        env:
+          E2B_API_KEY: ${{ secrets.E2B_API_KEY }}
+        run: |
+          if [[ -z "$E2B_API_KEY" ]]; then
+            echo "::error::Add the E2B_API_KEY repository secret to publish templates."
+            exit 1
+          fi
+      - uses: astral-sh/setup-uv@bec219d24cd3e171d82865faccec33120bb574f4 # v10.1.0
+        with:
+          version: ${{ env.UV_VERSION }}
+          enable-cache: false
+      - uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
+      - uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build, publish, and certify
+        env:
+          E2B_API_KEY: ${{ secrets.E2B_API_KEY }}
+          # E2B's builder must also authenticate to pull the private GHCR image.
+          E2B_REGISTRY_USERNAME: ${{ github.actor }}
+          E2B_REGISTRY_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set -euo pipefail
+          uv run --python 3.12 scripts/e2b-template.py \
+            --image-repository "ghcr.io/${GITHUB_REPOSITORY,,}/alk-hosted-runtime" \
+            --image-tag "${GITHUB_SHA}-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}" \
+            --template-name "alk-hosted-${GITHUB_SHA:0:12}" \
+            --output dist/e2b-template-release.json
+      - name: Summarize certified release
+        run: |
+          python3 - <<'PY'
+          import json
+          import os
+          from pathlib import Path
+
+          release = json.loads(Path("dist/e2b-template-release.json").read_text())
+          with open(os.environ["GITHUB_STEP_SUMMARY"], "a") as summary:
+              summary.write("## Certified E2B template\n\n")
+              for label, key in (
+                  ("ALK commit", "alk_source_revision"),
+                  ("Image", "image_reference"),
+                  ("Template reference", "template_reference"),
+                  ("CPU", "cpu_count"),
+                  ("Memory (MB)", "memory_mb"),
+                  ("Verified disk (GB)", "verified_disk_gb"),
+              ):
+                  summary.write(f"- {label}: `{release[key]}`\n")
+              summary.write("\nCertification checks:\n\n")
+              for check in release["certification_checks"]:
+                  summary.write(f"- {check}\n")
+              summary.write(
+                  "\nDownload the release artifact for the immutable template reference "
+                  "and full certification metadata.\n"
+              )
+          PY
+      - name: Save certified release metadata
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: e2b-template-${{ github.sha }}-${{ github.run_id }}-${{ github.run_attempt }}
+          path: dist/e2b-template-release.json
+          if-no-files-found: error
+          retention-days: 90
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index dd95d639..39240b5d 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -51,3 +51,39 @@ When moving an existing surface:
    repository as the source path.
 5. Update public docs/examples to use `agent-learning-kit`.
 6. Only then simplify or hide the older engine-level surface.
+# Automatic E2B templates
+
+The `E2B template` GitHub Actions workflow builds and certifies the hosted runtime
+on every push to `main`, including merges. It can also be rerun manually with
+**Actions → E2B template → Run workflow**, selecting `main`. Pull requests that
+change runtime inputs run credential-free validation only.
+
+One-time setup: add the E2B team's API key as the repository Actions secret
+`E2B_API_KEY`. The workflow uses `GITHUB_TOKEN` with `packages: write` to push to
+`ghcr.io/future-agi/agent-learning-kit/alk-hosted-runtime`, and supplies that
+short-lived credential to the E2B builder for the image import. No Docker Hub
+credential is needed. Organization policy must permit the repository to create
+GHCR packages; if the package already exists, grant this repository Actions access
+in its package settings. See GitHub's
+[Container registry documentation](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry).
+
+The workflow runs `scripts/e2b-template.py` against the checked-out commit. It builds
+`Dockerfile.hosted` for Linux amd64, pushes a uniquely tagged image, imports its
+immutable digest into `alk-hosted-<12-character commit SHA>`, and certifies the
+capabilities in `hosted-snapshot/catalog.json` in a temporary sandbox. The existing
+publisher defaults apply: 4 CPUs, 8192 MB RAM, and at least 10 GB verified disk.
+The publisher cleans up its certification sandbox when the check finishes.
+
+A successful run exposes the immutable `template-name:build-id` reference in the
+job summary and saves `e2b-template-release.json` as a 90-day workflow artifact.
+That file includes the source commit, image digest, resource sizes, and certification
+results. A failed certification fails the job and produces no certified release
+artifact; its image/template may already exist, so use only successful releases.
+Download the artifact and set the platform's `ALK_E2B_TEMPLATE_REFERENCE` to its
+`template_reference` when deploying. This workflow creates the templates; it does
+not change platform deployment configuration or move a production alias.
+
+Each commit has its own concurrency group, so a newer merge does not cancel or
+replace an older commit's publication. Reruns of the same commit are serialized.
+Reruns create a new image tag and E2B build; always use the immutable reference
+from the desired run.