diff --git a/.github/scripts/prune_computer_images.py b/.github/scripts/prune_computer_images.py
new file mode 100644
index 000000000..2cf220edf
--- /dev/null
+++ b/.github/scripts/prune_computer_images.py
@@ -0,0 +1,112 @@
+"""Delete the CI computer image mirror's images no run has used for ``--days`` days.
+
+``share_computer_images.py`` tags each image a passing main run used ``<tag>-seen-YYYYMMDD``. An image is kept while its
+newest such tag, or its upload when it has none, is within ``--days`` of now, with every platform manifest a kept index
+lists, since GHCR lists those as versions of their own. Every other version is deleted through GitHub's packages API,
+read and written with ``GITHUB_TOKEN``, as GHCR is. A version GitHub won't delete warns. ``--dry-run`` prints what
+would go and deletes nothing.
+"""
+
+from __future__ import annotations
+
+import argparse
+import base64
+import datetime
+import json
+import os
+import re
+import sys
+import urllib.error
+import urllib.parse
+import urllib.request
+
+SEEN = re.compile(r"^[0-9a-f]{16}-[0-9a-f]{64}-seen-(\d{8})$")
+_INDEXES = {"application/vnd.oci.image.index.v1+json", "application/vnd.docker.distribution.manifest.list.v2+json"}
+_ACCEPT = ", ".join([*_INDEXES, "application/vnd.oci.image.manifest.v1+json",
+                     "application/vnd.docker.distribution.manifest.v2+json"])
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__.split("\n\n")[0])
+    parser.add_argument("org")
+    parser.add_argument("package", help="the container package, as agentenv-ci-computers")
+    parser.add_argument("--days", type=int, default=7)
+    parser.add_argument("--dry-run", action="store_true")
+    args = parser.parse_args()
+
+    api = f"https://api.github.com/orgs/{args.org}/packages/container/{args.package}/versions"
+    try:
+        versions = _versions(api)
+    except urllib.error.HTTPError as e:
+        if e.code != 404:
+            raise
+        print(f"::warning::prune computer images: no package {args.org}/{args.package}, or this repository has no "
+              "access to it, so nothing is pruned")
+        return 0
+    cutoff = datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(days=args.days)
+    stale = stale_versions(versions, cutoff, lambda digest: _children(args.org, args.package, digest))
+    failed = 0
+    for version in stale:
+        print(f"{'would delete' if args.dry_run else 'deleting'} {version['name']} "
+              f"{version['metadata']['container']['tags'] or '(untagged)'}")
+        if not args.dry_run:
+            try:
+                _github("DELETE", f"{api}/{version['id']}")
+            except urllib.error.HTTPError as e:
+                failed += 1
+                print(f"::warning::couldn't delete {version['name']}: HTTP {e.code} {e.read().decode()[:200]}")
+    print(f"prune computer images: {len(stale) - failed} of {len(versions)} versions "
+          f"{'would be ' if args.dry_run else ''}deleted, none used since {cutoff:%Y-%m-%d}")
+    return 0
+
+
+def stale_versions(versions: list[dict], cutoff: datetime.datetime, children) -> list[dict]:
+    """The ``versions`` to delete: neither used nor uploaded since ``cutoff``, nor a platform manifest of one kept.
+    ``children(digest)`` lists the digests of the manifests the index of that digest lists, or none for an image."""
+    kept = {version["name"] for version in versions if _last_used(version) >= cutoff}
+    for digest in list(kept):
+        kept.update(children(digest))
+    return [version for version in versions if version["name"] not in kept]
+
+
+def _last_used(version: dict) -> datetime.datetime:
+    created = datetime.datetime.fromisoformat(version["created_at"].replace("Z", "+00:00"))
+    seen = [datetime.datetime.strptime(m.group(1), "%Y%m%d").replace(tzinfo=datetime.timezone.utc)
+            for tag in version["metadata"]["container"]["tags"] if (m := SEEN.match(tag))]
+    return max([created, *(day + datetime.timedelta(days=1) for day in seen)])
+
+
+def _versions(api: str) -> list[dict]:
+    versions, page = [], 1
+    while batch := _github("GET", f"{api}?per_page=100&page={page}"):
+        versions += batch
+        page += 1
+    return versions
+
+
+def _children(org: str, package: str, digest: str) -> list[str]:
+    """The platform manifests the index ``digest`` lists, read from GHCR with ``GITHUB_TOKEN``; none for an image."""
+    repository = f"{org}/{package}"
+    signed_in = base64.b64encode(f"x:{os.environ['GITHUB_TOKEN']}".encode()).decode()
+    with urllib.request.urlopen(urllib.request.Request(f"https://ghcr.io/token?scope=repository:{repository}:pull",
+                                                       headers={"Authorization": f"Basic {signed_in}"})) as response:
+        token = json.load(response)["token"]
+    request = urllib.request.Request(f"https://ghcr.io/v2/{repository}/manifests/{digest}",
+                                     headers={"Authorization": f"Bearer {token}", "Accept": _ACCEPT})
+    with urllib.request.urlopen(request) as response:
+        manifest = json.load(response)
+        media = response.headers.get("Content-Type", "").split(";")[0].strip()
+    return [child["digest"] for child in manifest.get("manifests", [])] if media in _INDEXES else []
+
+
+def _github(method: str, url: str):
+    request = urllib.request.Request(url, method=method, headers={
+        "Authorization": f"Bearer {os.environ['GITHUB_TOKEN']}", "Accept": "application/vnd.github+json",
+        "X-GitHub-Api-Version": "2022-11-28"})
+    with urllib.request.urlopen(request) as response:
+        body = response.read()
+    return json.loads(body) if body else None
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/.github/scripts/prune_registry.py b/.github/scripts/prune_registry.py
deleted file mode 100644
index 0b2ace7f8..000000000
--- a/.github/scripts/prune_registry.py
+++ /dev/null
@@ -1,98 +0,0 @@
-"""Keep only the images of a local registry's repository that a run used, before the registry's storage is cached.
-
-``prune`` drops each tag the registry's log has no manifest request for, then each manifest no remaining tag reaches,
-following an image index to the manifests it lists. The registry's ``garbage-collect`` then frees the layers only those
-manifests used; with ``--delete-untagged`` it would also delete a kept index's untagged platform manifests. ``links``,
-run after it, drops the repository's links to layers it freed.
-"""
-
-from __future__ import annotations
-
-import argparse
-import json
-import re
-import shutil
-import sys
-from pathlib import Path
-
-_V2 = Path("docker") / "registry" / "v2"
-
-
-def main(argv: list[str]) -> int:
-    parser = argparse.ArgumentParser(description=__doc__)
-    commands = parser.add_subparsers(dest="command", required=True)
-    pruning = commands.add_parser("prune", help="drop the tags and manifests the run didn't use")
-    linking = commands.add_parser("links", help="drop links to layers garbage-collect freed")
-    for command in (pruning, linking):
-        command.add_argument("storage", type=Path, help="the registry's storage root")
-        command.add_argument("repository")
-    pruning.add_argument("log", type=Path, help="the registry's log of the run")
-    args = parser.parse_args(argv)
-    if args.command == "prune":
-        kept, dropped = prune(args.storage, args.repository, used_tags(args.log.read_text(errors="replace"),
-                                                                        args.repository))
-        print(f"kept {kept} tags of {args.repository}, dropped {dropped}")
-    else:
-        print(f"dropped {drop_freed_links(args.storage, args.repository)} links to freed layers")
-    return 0
-
-
-def used_tags(log: str, repository: str) -> set[str]:
-    """The tags the log names a request for a manifest of ``repository`` by."""
-    return set(re.findall(rf"/v2/{re.escape(repository)}/manifests/([A-Za-z0-9_][A-Za-z0-9_.-]{{0,127}})(?=[\s\"?])",
-                          log))
-
-
-def prune(storage: Path, repository: str, used: set[str]) -> tuple[int, int]:
-    """Drop the tags of ``repository`` not in ``used``, then the manifests no remaining tag reaches; how many tags it
-    kept and dropped."""
-    manifests = storage / _V2 / "repositories" / repository / "_manifests"
-    tags = _children(manifests / "tags")
-    for tag in tags:
-        if tag.name not in used:
-            shutil.rmtree(tag)
-    kept = [tag for tag in tags if tag.name in used]
-    reached = _reached(storage, [(tag / "current" / "link").read_text().strip() for tag in kept])
-    for revision in _children(manifests / "revisions" / "sha256"):
-        if f"sha256:{revision.name}" not in reached:
-            shutil.rmtree(revision)
-    return len(kept), len(tags) - len(kept)
-
-
-def drop_freed_links(storage: Path, repository: str) -> int:
-    """Drop each link of ``repository`` to a layer that's no longer stored; how many."""
-    dropped = 0
-    for layer in _children(storage / _V2 / "repositories" / repository / "_layers" / "sha256"):
-        if not _blob(storage, f"sha256:{layer.name}").is_file():
-            shutil.rmtree(layer)
-            dropped += 1
-    return dropped
-
-
-def _reached(storage: Path, digests: list[str]) -> set[str]:
-    """``digests`` and every manifest an image index among them lists, recursively."""
-    reached, pending = set(), list(digests)
-    while pending:
-        digest = pending.pop()
-        if digest in reached:
-            continue
-        reached.add(digest)
-        try:
-            manifest = json.loads(_blob(storage, digest).read_bytes())
-        except (FileNotFoundError, ValueError):
-            continue
-        pending += [listed["digest"] for listed in manifest.get("manifests", []) if "digest" in listed]
-    return reached
-
-
-def _children(folder: Path) -> list[Path]:
-    return [child for child in folder.iterdir() if child.is_dir()] if folder.is_dir() else []
-
-
-def _blob(storage: Path, digest: str) -> Path:
-    hex_digest = digest.removeprefix("sha256:")
-    return storage / _V2 / "blobs" / "sha256" / hex_digest[:2] / hex_digest / "data"
-
-
-if __name__ == "__main__":
-    sys.exit(main(sys.argv[1:]))
diff --git a/.github/scripts/share_computer_images.py b/.github/scripts/share_computer_images.py
new file mode 100644
index 000000000..17fb93078
--- /dev/null
+++ b/.github/scripts/share_computer_images.py
@@ -0,0 +1,53 @@
+"""Copy every composed computer image a slow-tier runner's registry holds to the CI computer image mirror, the one
+``AGENT_ENV_COMPUTER_IMAGE_MIRROR`` names, so later runs copy them back rather than build them.
+
+Each image goes under its mirror tag (``composed.mirror_tag``: the composer's digest, then the key), and again with
+today's date, ``<tag>-seen-YYYYMMDD``, which is how ``prune_computer_images.py`` tells an image a recent run used from one
+none has. An image already in the mirror is only tagged again: no blob it holds is sent twice. The mirror is written as
+``GITHUB_ACTOR`` with ``GITHUB_TOKEN``; one the composer can't read anonymously, as GHCR makes a new package, warns.
+"""
+
+from __future__ import annotations
+
+import argparse
+import datetime
+import json
+import os
+import re
+import sys
+import urllib.request
+
+from agent_env.env.envs.computer.utils.composed import REPOSITORY, mirror_tag
+from agent_env.store.image_store.oci_registry_credentials import RegistryAuth
+from agent_env.store.image_store.registry_api import copy_image, pin_digest, pin_if_served
+
+KEY = re.compile(r"^[0-9a-f]{64}$")
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__.split("\n\n")[0])
+    parser.add_argument("mirror", help="the mirror repository, as ghcr.io/org/agentenv-ci-computers")
+    parser.add_argument("--registry", default="localhost:5000", help="the runner's registry")
+    args = parser.parse_args()
+
+    with urllib.request.urlopen(f"http://{args.registry}/v2/{REPOSITORY}/tags/list") as response:
+        keys = sorted(tag for tag in json.load(response).get("tags") or [] if KEY.match(tag))
+    auth = RegistryAuth(args.mirror.partition("/")[0], os.environ["GITHUB_ACTOR"], os.environ["GITHUB_TOKEN"])
+    seen = f"seen-{datetime.datetime.now(datetime.timezone.utc):%Y%m%d}"
+    for key in keys:
+        source = pin_digest(f"{args.registry}/{REPOSITORY}:{key}", None)
+        for tag in (mirror_tag(key), f"{mirror_tag(key)}-{seen}"):
+            copy_image(source, f"{args.mirror}:{tag}", None, auth)
+        print(f"shared {key}")
+    print(f"share computer images: {len(keys)} images in {args.mirror}, each tagged {seen}")
+    if keys:
+        try:
+            pin_if_served(f"{args.mirror}:{mirror_tag(keys[0])}", None)
+        except ValueError as e:
+            print(f"::warning::the composer reads {args.mirror} anonymously and can't, so every run builds its images; "
+                  f"make the package public: {e}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/.github/workflows/computer-image-mirror.yml b/.github/workflows/computer-image-mirror.yml
new file mode 100644
index 000000000..7c0865cdf
--- /dev/null
+++ b/.github/workflows/computer-image-mirror.yml
@@ -0,0 +1,31 @@
+name: Computer image mirror
+
+# Deletes the slow tier's shared computer images (local-backends.yml) that no passing main run has used for a week.
+on:
+  schedule:
+    - cron: "17 6 * * *"
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: List what would be deleted, and delete nothing
+        type: boolean
+        default: false
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  prune:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+        with:
+          sparse-checkout: .github/scripts
+      - name: Delete the images unused for a week
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: |
+          python3 .github/scripts/prune_computer_images.py scaleapi agentenv-ci-computers --days 7 \
+            ${{ inputs.dry_run && '--dry-run' || '' }}
diff --git a/.github/workflows/local-backends.yml b/.github/workflows/local-backends.yml
index 3b08d5c52..4eadbcff3 100644
--- a/.github/workflows/local-backends.yml
+++ b/.github/workflows/local-backends.yml
@@ -22,6 +22,8 @@ concurrency:
 
 env:
   AGENT_ENV_ENVIRONMENT: dev
+  # The slow tier's composed computer images, shared between its runners (computer-image-mirror.yml prunes it).
+  COMPUTER_IMAGE_MIRROR: ghcr.io/scaleapi/agentenv-ci-computers
   PIP_DISABLE_PIP_VERSION_CHECK: "1"
 
 jobs:
@@ -154,8 +156,14 @@ jobs:
         shard: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
     runs-on: ubuntu-latest
     timeout-minutes: 40
+    permissions:
+      contents: read
+      packages: write
     steps:
       - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+        # The tests run with packages: write; only the share step, on main, gets the token.
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.12"
@@ -168,81 +176,66 @@ jobs:
       # starts afterwards.
       - name: Pull the base images from mirror.gcr.io
         run: python3 .github/scripts/mirror_base_images.py src tst
-      # A computer image or disk is tagged with a key of everything it is built from, and the composer reuses one the
-      # image store already holds for its key. That key includes the lock of the packages the image installs, which the
-      # composer resolves from Ubuntu's archive, PyPI and download URLs unless the store holds it. The registry keeps
-      # its storage on the runner, and the computer tests share their locks and files in the packages folder
-      # (tst/util/package_cache.py); both are restored from what main saved latest this week, so a run neither resolves
-      # nor builds again what hasn't changed. A shard that runs no computer tests misses.
-      - name: Week of the computer images' cache
+      # The computer tests share the package locks a compose resolves, and the files they name, in the packages folder
+      # (tst/util/package_cache.py). An image's key includes its lock, which the composer otherwise resolves from
+      # Ubuntu's archive, PyPI and download URLs, so the folder is restored from what main saved latest this week.
+      - name: Week of the packages' cache
         id: week
         run: echo "week=$(date -u +%G-W%V)" >> "$GITHUB_OUTPUT"
-      - name: Restore the computer images and packages
-        id: computers
+      - name: Restore the packages
+        id: packages
         uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
-          path: |
-            ${{ runner.temp }}/registry
-            ${{ runner.temp }}/packages
-          key: computers-${{ matrix.shard }}-${{ steps.week.outputs.week }}
-          restore-keys: computers-${{ matrix.shard }}-${{ steps.week.outputs.week }}-
+          path: ${{ runner.temp }}/packages
+          key: packages-${{ matrix.shard }}-${{ steps.week.outputs.week }}
+          restore-keys: packages-${{ matrix.shard }}-${{ steps.week.outputs.week }}-
       - name: Start the local registry
         run: |
-          mkdir -p "$RUNNER_TEMP/registry"
-          docker run --detach --name registry --publish 5000:5000 --volume "$RUNNER_TEMP/registry:/var/lib/registry" \
-            mirror.gcr.io/library/registry:2
+          docker run --detach --name registry --publish 5000:5000 mirror.gcr.io/library/registry:2
           timeout 30 sh -c 'until curl -sf http://localhost:5000/v2/ >/dev/null; do sleep 1; done'
       # x64 hosted runners have /dev/kvm; the disk form's tests boot under it, and skip without it, which fails below.
       - name: Let the local provider boot disks with KVM
         run: sudo chmod 666 /dev/kvm
+      # A computer image or disk is tagged with a key of everything it is built from. A compose that finds no image of
+      # its key in the local registry copies the one the mirror holds, which main's runs share, rather than build it.
       - name: Slow integration tier on the local defaults
         id: tests
         env:
           AGENTENV_TEST_SHARD: ${{ matrix.shard }}/12
           AGENTENV_TEST_PACKAGES: ${{ runner.temp }}/packages
+          AGENT_ENV_COMPUTER_IMAGE_MIRROR: ${{ env.COMPUTER_IMAGE_MIRROR }}
         run: |
           .venv/bin/python -m pytest -m int_test_slow -n 2 --dist loadfile -rA --timeout=1200 \
             --junitxml=junit-integration-slow.xml tst/integration --ignore=tst/integration/env/gateway/gateway_test.py
-      # Only the computer images this run used are kept, with the packages, and only main saves them, once its tests
-      # pass, so pull requests reuse main's without filling the repository's cache. An image is used when the registry's
-      # log has a request for it by its tag (prune_registry.py), so what a week's earlier runs built and this one no
-      # longer asks for is dropped. The garbage collection frees what only the dropped tags and repositories referenced;
-      # with --delete-untagged it would also delete the untagged platform manifests of an image index, and their layers.
-      # The entry is named by the image keys the registry holds and the locks the packages hold, so a run that built a
-      # new image or resolved a new lock saves a new one.
-      - name: Keep only the computer images this run used
-        id: kept
+      # Only main saves the packages, once its tests pass, so pull requests reuse main's without filling the
+      # repository's cache. The entry is named by the locks the folder holds, so a run that resolved a new lock saves a
+      # new one.
+      - name: Name the packages' cache entry
+        id: lockkey
         if: always()
         run: |
-          repositories="$RUNNER_TEMP/registry/docker/registry/v2/repositories"
-          if [ ! -d "$repositories/agentenv-computers" ]; then echo "computers=false" >> "$GITHUB_OUTPUT"; exit 0; fi
-          docker logs registry > "$RUNNER_TEMP/registry.log" 2>&1
-          docker stop registry
-          sudo find "$repositories" -mindepth 1 -maxdepth 1 ! -name agentenv-computers -exec rm -rf {} +
-          sudo python3 .github/scripts/prune_registry.py prune "$RUNNER_TEMP/registry" agentenv-computers \
-            "$RUNNER_TEMP/registry.log"
-          docker run --rm --volume "$RUNNER_TEMP/registry:/var/lib/registry" mirror.gcr.io/library/registry:2 \
-            garbage-collect /etc/docker/registry/config.yml > /dev/null
-          sudo python3 .github/scripts/prune_registry.py links "$RUNNER_TEMP/registry" agentenv-computers
-          mkdir -p "$RUNNER_TEMP/packages"
-          du -sh "$RUNNER_TEMP/registry" "$RUNNER_TEMP/packages"
-          if [ -z "$(sudo ls "$repositories/agentenv-computers/_manifests/tags")" ]; then
-            echo "computers=false" >> "$GITHUB_OUTPUT"; exit 0
-          fi
-          key=$({ sudo ls "$repositories/agentenv-computers/_manifests/tags"
-                  ls "$RUNNER_TEMP/packages/agentenv-packages/locks" 2>/dev/null; } | sort | sha256sum | cut -c1-16)
-          echo "key=computers-${{ matrix.shard }}-${{ steps.week.outputs.week }}-$key" >> "$GITHUB_OUTPUT"
-          echo "computers=true" >> "$GITHUB_OUTPUT"
-      - name: Save the computer images and packages
+          locks="$RUNNER_TEMP/packages/agentenv-packages/locks"
+          if [ -z "$(ls "$locks" 2>/dev/null)" ]; then echo "packages=false" >> "$GITHUB_OUTPUT"; exit 0; fi
+          key=$(ls "$locks" | sort | sha256sum | cut -c1-16)
+          echo "key=packages-${{ matrix.shard }}-${{ steps.week.outputs.week }}-$key" >> "$GITHUB_OUTPUT"
+          echo "packages=true" >> "$GITHUB_OUTPUT"
+      - name: Save the packages
         if: >-
           always() && github.event_name == 'push' && steps.tests.outcome == 'success'
-          && steps.kept.outputs.computers == 'true' && steps.kept.outputs.key != steps.computers.outputs.cache-matched-key
+          && steps.lockkey.outputs.packages == 'true' && steps.lockkey.outputs.key != steps.packages.outputs.cache-matched-key
         uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
-          path: |
-            ${{ runner.temp }}/registry
-            ${{ runner.temp }}/packages
-          key: ${{ steps.kept.outputs.key }}
+          path: ${{ runner.temp }}/packages
+          key: ${{ steps.lockkey.outputs.key }}
+      # Once main's tests pass, every image this runner built or copied goes to the mirror under its key and a
+      # <key>-seen-<date> tag, which computer-image-mirror.yml's prune keeps an image by.
+      - name: Share the computer images
+        continue-on-error: true
+        if: >-
+          always() && steps.tests.outcome == 'success' && github.event_name == 'push'
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: .venv/bin/python .github/scripts/share_computer_images.py "$COMPUTER_IMAGE_MIRROR"
       - name: Skips must be declared capability gaps
         if: always()
         run: |
diff --git a/AGENTS.md b/AGENTS.md
index 5af2559e5..e3b0cc463 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -391,9 +391,8 @@ orchestrators call it the same way. What callers rely on:
   `.github/scripts/slow_test_durations.py`.
 - The computer tests compose in stores of their own, but share the package locks and files a compose
   resolves (`tst/util/package_cache.py`) through `AGENTENV_TEST_PACKAGES`, a folder for the run unless
-  it's set. The slow tier caches that folder with the local registry's computer images, so a run
-  resolves from Ubuntu's archive, PyPI or a download URL only what changed since `main` last saved
-  them.
+  it's set. The slow tier caches that folder, so a run resolves from Ubuntu's archive, PyPI or a
+  download URL only what changed since `main` last saved it.
 - `tst/manual/` and `tst/benchmarks/` run only by hand, as each module's docstring says; no CI job
   collects them.
 - `tst/formal/` holds TLA+ models, run only by hand with each model's `check.sh`; the `AGENTS.md`
diff --git a/src/agent_env/config/describe.py b/src/agent_env/config/describe.py
index e8e291d7f..73e289cbc 100644
--- a/src/agent_env/config/describe.py
+++ b/src/agent_env/config/describe.py
@@ -673,6 +673,7 @@ def env_sources() -> tuple[EnvSource, ...]:
             EnvSource("AGENT_ENV_MODAL_REGION", None, "no file equivalent"),
             EnvSource("AGENT_ENV_MODAL_APP_NAME", None, "no file equivalent"),
             EnvSource("AGENT_ENV_FIXTURE_PREFIX", None, "no file equivalent"),
+            EnvSource("AGENT_ENV_COMPUTER_IMAGE_MIRROR", None, "no file equivalent"),
             EnvSource("MODAL_TOKEN_ID", None, "credential, no file equivalent"),
             EnvSource("MODAL_TOKEN_SECRET", None, "credential, no file equivalent"),
     ]
diff --git a/src/agent_env/config/runtime.py b/src/agent_env/config/runtime.py
index a98b17005..66326e090 100644
--- a/src/agent_env/config/runtime.py
+++ b/src/agent_env/config/runtime.py
@@ -24,6 +24,11 @@
 objects, image builds, env and agent snapshots, changelogs, default agent and judge
 trajectories, verifier outputs and the A2A validator's fixtures, so a fresh control-plane
 backend can write without colliding with existing objects in a shared store. Empty in prod.
+
+AGENT_ENV_COMPUTER_IMAGE_MIRROR (default ""): a registry repository, read anonymously, holding composed computer images
+under their keys and the composer's own digest, as ``ghcr.io/org/computers``. A compose that finds no image of a key in the
+env's image store copies the mirror's into it instead of building it. CI sets it so its runners share the images main
+built.
 """
 
 from __future__ import annotations
@@ -226,6 +231,9 @@ class Config:
     fixture_prefix: str = field(
         default_factory=lambda: os.getenv("AGENT_ENV_FIXTURE_PREFIX", "")
     )
+    computer_image_mirror: str = field(
+        default_factory=lambda: os.getenv("AGENT_ENV_COMPUTER_IMAGE_MIRROR", "")
+    )
     agent_sandbox_mode: str = field(
         default_factory=lambda: os.getenv("AGENT_SANDBOX_MODE") or _default_sandbox_mode()
     )
diff --git a/src/agent_env/env/envs/computer/utils/composed.py b/src/agent_env/env/envs/computer/utils/composed.py
index 3ee5281ad..ec3d5d993 100644
--- a/src/agent_env/env/envs/computer/utils/composed.py
+++ b/src/agent_env/env/envs/computer/utils/composed.py
@@ -117,6 +117,12 @@ def composition() -> str:
     return "sha256:" + digest.hexdigest()
 
 
+def mirror_tag(key: str) -> str:
+    """The tag of the image of ``key`` in a computer image mirror: the key, under the start of ``composition()``, so a
+    change to the code that composes an image builds it again rather than reuse one the old code built."""
+    return f"{composition().removeprefix('sha256:')[:16]}-{key.removeprefix('sha256:')}"
+
+
 def _rank(result: dict) -> int:
     """How far a pair got: ready, then built and either unprobed or failed at its probe, then anything short of an
     image, and below that one another composer recorded. A result takes a stored one's place only when it got at least
diff --git a/src/agent_env/env/envs/computer/utils/composer.py b/src/agent_env/env/envs/computer/utils/composer.py
index 309f5521c..32aefd93a 100644
--- a/src/agent_env/env/envs/computer/utils/composer.py
+++ b/src/agent_env/env/envs/computer/utils/composer.py
@@ -50,7 +50,7 @@
     thin_disk,
     windows_disk,
 )
-from agent_env.env.envs.computer.utils.composed import BUILT, REPOSITORY, Record, failed, now, stale
+from agent_env.env.envs.computer.utils.composed import BUILT, REPOSITORY, Record, failed, mirror_tag, now, stale
 from agent_env.env.envs.computer.utils.install import Install, for_os, platform_of
 from agent_env.env.published_images import DISK, DISK_TOOLS_IMAGE, published_disk, published_pinned
 from agent_env.providers.sandbox_providers.host_images import platform_tag
@@ -58,7 +58,7 @@
 from agent_env.store.image_store.image_contents import image_config, labels
 from agent_env.store.image_store.oci_registry_credentials import names_registry
 from agent_env.store.image_store.image_store import ImageStore
-from agent_env.store.image_store.registry_api import pin_digest, pin_if_served, write_index
+from agent_env.store.image_store.registry_api import copy_image, pin_digest, pin_if_served, write_index
 from agent_env.store.local_state import holding_locks
 from agent_env.utils.docker.build import DockerBuildError
 
@@ -771,9 +771,20 @@ def _key(**inputs: Any) -> str:
 
 def _stored(env: ComputerEnv, key: str) -> tuple[ImageStore, str, str | None]:
     """The env's image store, the ref there of the image of ``key``, and that ref pinned when the store serves one
-    already, for any env that built it."""
+    already, for any env that built it, or once it's copied there from the configured computer image mirror."""
     store = _image_store(env)
-    ref = store.image_ref(REPOSITORY, key.removeprefix("sha256:"))
+    tag = key.removeprefix("sha256:")
+    ref = store.image_ref(REPOSITORY, tag)
+    if (pinned := pin_if_served(ref, store.auth(ref))) is not None or not (mirror := get_config().computer_image_mirror):
+        return store, ref, pinned
+    try:
+        if (mirrored := pin_if_served(f"{mirror}:{mirror_tag(tag)}", None)) is None:
+            return store, ref, None
+        copy_image(mirrored, ref, None, store.auth(ref))
+    except (ValueError, KeyError, OSError) as e:
+        logger.warning(f"the computer image mirror {mirror} couldn't give {tag}, so it's built: {e}")
+        return store, ref, None
+    logger.info(f"copied {tag} from the computer image mirror {mirror}")
     return store, ref, pin_if_served(ref, store.auth(ref))
 
 
diff --git a/src/agent_env/store/image_store/registry_api.py b/src/agent_env/store/image_store/registry_api.py
index 4544cfed8..07d92a8ed 100644
--- a/src/agent_env/store/image_store/registry_api.py
+++ b/src/agent_env/store/image_store/registry_api.py
@@ -1,5 +1,6 @@
 """Read an image from its registry over the OCI distribution API: its digest, to pin a tag to the image it names now,
-and its manifests and blobs, to inspect what it holds without pulling it; and write an index of images it holds."""
+and its manifests and blobs, to inspect what it holds without pulling it; write an index of images it holds; and copy an
+image from one registry to another."""
 
 from __future__ import annotations
 
@@ -7,6 +8,7 @@
 import hashlib
 import json
 import re
+import tempfile
 from collections.abc import Iterator
 from dataclasses import dataclass
 from pathlib import Path
@@ -217,6 +219,40 @@ def write_index(ref: str, images: dict[str, str], auth: RegistryAuth | None, *,
             {"schemaVersion": 2, "mediaType": media, "manifests": manifests}).encode(), media)
 
 
+def copy_image(source: str, target: str, source_auth: RegistryAuth | None, target_auth: RegistryAuth | None, *,
+               timeout: float = _TIMEOUT_SECONDS) -> None:
+    """Copy the image ``source`` names, pinned by its digest, to ``target``'s tag: every blob ``target``'s repository
+    lacks, then each manifest byte for byte, so the copy keeps ``source``'s digest; an index's platform manifests
+    first, each by its digest."""
+    digest = _parse(source).digest
+    if digest is None:
+        raise ValueError(f"{source}: a copy goes by the image's digest, and this names none")
+    image = _parse(target)
+    with (_Repository(_parse(source), source_auth, timeout, source) as reading,
+          _Repository(image, target_auth, timeout, target) as writing,
+          tempfile.TemporaryDirectory(prefix="agentenv-copy-") as work):
+
+        def manifest(reference: str) -> tuple[bytes, str]:
+            response = reading.get(f"manifests/{reference}", accept=_MANIFEST_TYPES)
+            body = response.json()
+            served = response.headers.get("content-type", "").split(";")[0].strip() or body.get("mediaType", "")
+            if served in _INDEXES:
+                for child in body["manifests"]:
+                    manifest(child["digest"])
+            else:
+                for blob in [body["config"], *body["layers"]]:
+                    if writing.has_blob(blob["digest"]):
+                        continue
+                    path = Path(work) / blob["digest"].removeprefix("sha256:")
+                    read_blob(source, blob["digest"], source_auth, path, timeout=timeout)
+                    writing.upload(blob["digest"], path)
+                    path.unlink()
+            writing.put(f"manifests/{reference}", response.content, served)
+            return response.content, served
+
+        writing.put(f"manifests/{image.tag or 'latest'}", *manifest(digest))
+
+
 class _Repository:
     """One image's repository on its registry, read with the Bearer token the registry's first challenge asks for."""
 
@@ -250,6 +286,29 @@ def put(self, path: str, content: bytes, content_type: str) -> None:
         if response.status_code not in (200, 201):
             self._raise_for(response)
 
+    def has_blob(self, digest: str) -> bool:
+        response = self._send("HEAD", f"blobs/{digest}", None, stream=False)
+        if response.status_code == 404:
+            return False
+        self._raise_for(response)
+        return True
+
+    def upload(self, digest: str, path: Path) -> None:
+        """Push the file ``path`` as the blob ``digest``, in one request after the registry opens an upload."""
+        opened = self._send("POST", "blobs/uploads/", None, stream=False)
+        if opened.status_code != 202 or "location" not in opened.headers:
+            self._raise_for(opened)
+            raise ValueError(f"{self._what}: {self._host} opened no upload for {digest} (HTTP {opened.status_code})")
+        location = httpx.URL(f"{self._base}/").join(opened.headers["location"])
+        base = httpx.URL(self._base)
+        if (location.scheme, location.netloc) != (base.scheme, base.netloc):
+            raise ValueError(f"{self._what}: {self._host} sent the upload of {digest} to {location.scheme}://"
+                             f"{location.netloc.decode()}, which its credentials don't go to")
+        response = self._send("PUT", str(location.copy_merge_params({"digest": digest})), None, stream=False,
+                              content=path, content_type="application/octet-stream")
+        if response.status_code != 201:
+            self._raise_for(response)
+
     @contextlib.contextmanager
     def stream(self, path: str) -> Iterator[httpx.Response]:
         """``path`` as a streamed response, closed when the block ends."""
@@ -262,19 +321,27 @@ def stream(self, path: str) -> Iterator[httpx.Response]:
         finally:
             response.close()
 
-    def _send(self, method: str, path: str, accept: str | None, *, stream: bool, content: bytes | None = None,
+    def _send(self, method: str, path: str, accept: str | None, *, stream: bool, content: bytes | Path | None = None,
               content_type: str | None = None) -> httpx.Response:
+        """``path`` is under the repository, or a whole URL the registry gave; a file's ``content`` streams from disk."""
+        url = path if path.startswith(("http://", "https://")) else f"{self._base}/{path}"
         try:
-            for _ in range(2):
+            for attempt in range(2):
                 headers = {"Accept": accept} if accept else {}
                 if content_type:
                     headers["Content-Type"] = content_type
                 if self._token:
                     headers["Authorization"] = f"Bearer {self._token}"
-                request = self._client.build_request(method, f"{self._base}/{path}", headers=headers, content=content)
-                # Basic credentials go with every request until a Bearer token replaces them.
-                response = self._client.send(request, auth=None if self._token else self._basic, stream=stream)
-                if response.status_code != 401 or self._token:
+                with contextlib.ExitStack() as opened:
+                    body = content
+                    if isinstance(content, Path):
+                        headers["Content-Length"] = str(content.stat().st_size)
+                        body = opened.enter_context(content.open("rb"))
+                    request = self._client.build_request(method, url, headers=headers, content=body)
+                    # Basic credentials go with every request until a Bearer token replaces them.
+                    response = self._client.send(request, auth=None if self._token else self._basic, stream=stream)
+                # A held token is asked for again once: GHCR scopes it to the first challenge, a pull's before a push.
+                if response.status_code != 401 or attempt:
                     return response
                 if stream:
                     response.read()
diff --git a/tst/integration/slow_durations.json b/tst/integration/slow_durations.json
index 4955f5578..6061360bb 100644
--- a/tst/integration/slow_durations.json
+++ b/tst/integration/slow_durations.json
@@ -7,182 +7,183 @@
   "tst/integration/env/gateway/gateway_test.py"
  ],
  "seconds": {
-  "packages/agentenv-protocol/tests/test_a2a_agent.py": 1.1,
+  "packages/agentenv-protocol/tests/test_a2a_agent.py": 1.2,
   "packages/agentenv-protocol/tests/test_a2a_agent_examples.py": 0.1,
-  "packages/agentenv-protocol/tests/test_a2a_cdp_config.py": 0.2,
-  "packages/agentenv-protocol/tests/test_a2a_object_transfers.py": 0.4,
-  "packages/agentenv-protocol/tests/test_a2a_peer_agents.py": 3.9,
-  "packages/agentenv-protocol/tests/test_a2a_proxy.py": 9.0,
-  "packages/agentenv-protocol/tests/test_a2a_staging.py": 1.4,
-  "packages/agentenv-protocol/tests/test_a2a_trajectory_log.py": 0.3,
-  "packages/agentenv-protocol/tests/test_agent_env_environment.py": 0.4,
+  "packages/agentenv-protocol/tests/test_a2a_cdp_config.py": 0.1,
+  "packages/agentenv-protocol/tests/test_a2a_object_transfers.py": 0.5,
+  "packages/agentenv-protocol/tests/test_a2a_peer_agents.py": 4.0,
+  "packages/agentenv-protocol/tests/test_a2a_proxy.py": 8.5,
+  "packages/agentenv-protocol/tests/test_a2a_staging.py": 1.0,
+  "packages/agentenv-protocol/tests/test_a2a_trajectory_log.py": 0.2,
+  "packages/agentenv-protocol/tests/test_agent_env_environment.py": 0.2,
   "packages/agentenv-protocol/tests/test_browser_cdp.py": 0.7,
-  "packages/agentenv-protocol/tests/test_browser_data.py": 0.3,
+  "packages/agentenv-protocol/tests/test_browser_data.py": 0.2,
   "packages/agentenv-protocol/tests/test_browser_state.py": 0.1,
   "packages/agentenv-protocol/tests/test_client.py": 0.1,
-  "packages/agentenv-protocol/tests/test_computer_app_data.py": 3.1,
-  "packages/agentenv-protocol/tests/test_computer_app_server.py": 8.4,
-  "packages/agentenv-protocol/tests/test_computer_conformance.py": 169.6,
+  "packages/agentenv-protocol/tests/test_computer_app_data.py": 3.0,
+  "packages/agentenv-protocol/tests/test_computer_app_server.py": 7.2,
+  "packages/agentenv-protocol/tests/test_computer_conformance.py": 114.0,
   "packages/agentenv-protocol/tests/test_computer_conformance_checks.py": 1.1,
-  "packages/agentenv-protocol/tests/test_computer_conformance_page.py": 54.1,
-  "packages/agentenv-protocol/tests/test_computer_conformance_recording.py": 32.7,
-  "packages/agentenv-protocol/tests/test_computer_dataplane.py": 3.1,
-  "packages/agentenv-protocol/tests/test_computer_declare.py": 0.9,
-  "packages/agentenv-protocol/tests/test_computer_driver.py": 3.5,
-  "packages/agentenv-protocol/tests/test_computer_extensions.py": 5.7,
-  "packages/agentenv-protocol/tests/test_computer_frames.py": 5.4,
+  "packages/agentenv-protocol/tests/test_computer_conformance_page.py": 32.0,
+  "packages/agentenv-protocol/tests/test_computer_conformance_recording.py": 28.9,
+  "packages/agentenv-protocol/tests/test_computer_dataplane.py": 4.5,
+  "packages/agentenv-protocol/tests/test_computer_declare.py": 1.1,
+  "packages/agentenv-protocol/tests/test_computer_driver.py": 1.6,
+  "packages/agentenv-protocol/tests/test_computer_extensions.py": 6.1,
+  "packages/agentenv-protocol/tests/test_computer_frames.py": 2.2,
   "packages/agentenv-protocol/tests/test_computer_macos.py": 0.0,
-  "packages/agentenv-protocol/tests/test_computer_page.py": 1.9,
-  "packages/agentenv-protocol/tests/test_computer_queue.py": 15.8,
-  "packages/agentenv-protocol/tests/test_computer_recording.py": 33.6,
+  "packages/agentenv-protocol/tests/test_computer_page.py": 1.0,
+  "packages/agentenv-protocol/tests/test_computer_queue.py": 16.2,
+  "packages/agentenv-protocol/tests/test_computer_recording.py": 33.5,
   "packages/agentenv-protocol/tests/test_computer_seed.py": 0.0,
-  "packages/agentenv-protocol/tests/test_computer_serve.py": 0.3,
+  "packages/agentenv-protocol/tests/test_computer_serve.py": 0.4,
   "packages/agentenv-protocol/tests/test_computer_served.py": 0.3,
   "packages/agentenv-protocol/tests/test_computer_session_windows.py": 0.4,
-  "packages/agentenv-protocol/tests/test_computer_spaces.py": 1.2,
-  "packages/agentenv-protocol/tests/test_computer_svc_forward.py": 8.5,
-  "packages/agentenv-protocol/tests/test_computer_tool_prefix.py": 1.1,
+  "packages/agentenv-protocol/tests/test_computer_spaces.py": 1.3,
+  "packages/agentenv-protocol/tests/test_computer_svc_forward.py": 7.6,
+  "packages/agentenv-protocol/tests/test_computer_tool_prefix.py": 1.6,
   "packages/agentenv-protocol/tests/test_control_token.py": 0.0,
-  "packages/agentenv-protocol/tests/test_data_objects.py": 2.9,
-  "packages/agentenv-protocol/tests/test_errors.py": 0.3,
+  "packages/agentenv-protocol/tests/test_data_objects.py": 2.6,
+  "packages/agentenv-protocol/tests/test_errors.py": 0.2,
   "packages/agentenv-protocol/tests/test_extension_methods.py": 0.1,
   "packages/agentenv-protocol/tests/test_intake.py": 0.0,
   "packages/agentenv-protocol/tests/test_manifest.py": 0.0,
   "packages/agentenv-protocol/tests/test_preflight.py": 0.0,
   "packages/agentenv-protocol/tests/test_tool_access.py": 0.2,
-  "packages/agentenv-protocol/tests/test_tool_annotations.py": 0.3,
-  "packages/agentenv-protocol/tests/test_tool_client.py": 1.1,
-  "packages/agentenv-protocol/tests/test_tool_context.py": 0.1,
+  "packages/agentenv-protocol/tests/test_tool_annotations.py": 0.2,
+  "packages/agentenv-protocol/tests/test_tool_client.py": 0.9,
+  "packages/agentenv-protocol/tests/test_tool_context.py": 0.0,
   "packages/agentenv-protocol/tests/test_tool_context_fastmcp.py": 0.2,
-  "packages/agentenv-protocol/tests/test_tool_context_injection.py": 0.3,
-  "packages/agentenv-protocol/tests/test_website_api.py": 0.7,
-  "packages/agentenv-protocol/tests/test_website_browser.py": 3.7,
-  "packages/agentenv-protocol/tests/test_website_conformance.py": 17.5,
-  "packages/agentenv-protocol/tests/test_website_environment.py": 8.0,
-  "packages/agentenv-protocol/tests/test_website_mcp.py": 2.0,
-  "packages/agentenv-protocol/tests/test_website_notes_example.py": 1.7,
+  "packages/agentenv-protocol/tests/test_tool_context_injection.py": 0.4,
+  "packages/agentenv-protocol/tests/test_website_api.py": 0.6,
+  "packages/agentenv-protocol/tests/test_website_browser.py": 3.8,
+  "packages/agentenv-protocol/tests/test_website_conformance.py": 17.8,
+  "packages/agentenv-protocol/tests/test_website_environment.py": 7.1,
+  "packages/agentenv-protocol/tests/test_website_mcp.py": 1.8,
+  "packages/agentenv-protocol/tests/test_website_notes_example.py": 1.6,
   "packages/agentenv-protocol/tests/test_website_readiness.py": 0.1,
-  "tst/installer/test_container_journey.py": 162.4,
-  "tst/installer/test_plugin_changes.py::test_a_bare_directory_that_builds_as_agent_env_never_replaces_it[pipx]": 8.6,
-  "tst/installer/test_plugin_changes.py::test_a_bare_directory_that_builds_as_agent_env_never_replaces_it[uv-project]": 10.3,
-  "tst/installer/test_plugin_changes.py::test_a_bare_directory_that_builds_as_agent_env_never_replaces_it[uv-tool]": 17.5,
-  "tst/installer/test_plugin_changes.py::test_a_bare_directory_that_builds_as_agent_env_never_replaces_it[venv]": 65.7,
-  "tst/installer/test_plugin_changes.py::test_a_change_made_elsewhere_while_add_waits_for_confirmation_is_not_undone": 9.0,
-  "tst/installer/test_plugin_changes.py::test_a_newer_wheel_upgrades_the_installed_plugin[pipx]": 47.6,
-  "tst/installer/test_plugin_changes.py::test_a_newer_wheel_upgrades_the_installed_plugin[uv-project]": 43.6,
-  "tst/installer/test_plugin_changes.py::test_a_newer_wheel_upgrades_the_installed_plugin[uv-tool]": 24.5,
-  "tst/installer/test_plugin_changes.py::test_a_newer_wheel_upgrades_the_installed_plugin[venv]": 75.5,
-  "tst/installer/test_plugin_changes.py::test_a_package_added_next_to_a_plugin_is_removed_the_same_way": 18.8,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_survives_the_installers_own_rebuild_and_is_removed[pipx]": 58.5,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_survives_the_installers_own_rebuild_and_is_removed[uv-project]": 46.5,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_survives_the_installers_own_rebuild_and_is_removed[uv-tool]": 28.2,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_survives_the_installers_own_rebuild_and_is_removed[venv]": 124.7,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_conflicts_with_an_installed_one_is_rolled_back[pipx]": 27.9,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_conflicts_with_an_installed_one_is_rolled_back[uv-project]": 33.0,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_conflicts_with_an_installed_one_is_rolled_back[uv-tool]": 35.4,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_conflicts_with_an_installed_one_is_rolled_back[venv]": 72.3,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_selects_a_shared_config_file_is_still_blocked_by_it[uv-tool]": 26.7,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_selects_a_shared_config_file_is_still_blocked_by_it[venv]": 26.4,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_sets_the_config_on_import_is_reported[uv-tool]": 11.6,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_that_sets_the_config_on_import_is_reported[venv]": 50.9,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_whose_bundled_config_is_in_effect_can_be_removed[uv-tool]": 17.6,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_whose_bundled_config_is_in_effect_can_be_removed[venv]": 36.7,
-  "tst/installer/test_plugin_changes.py::test_a_plugin_whose_root_option_breaks_startup_can_still_be_removed[uv-tool]": 37.0,
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   "tst/unit/task_step/test_prompt_agent_human_default.py": 0.0,
-  "tst/unit/task_step/test_prompt_agent_live_trajectory.py": 0.8,
+  "tst/unit/task_step/test_prompt_agent_live_trajectory.py": 0.7,
   "tst/unit/task_step/test_prompt_agent_model_params.py": 0.0,
-  "tst/unit/task_step/test_prompt_agent_notifications.py": 0.6,
-  "tst/unit/task_step/test_prompt_agent_post_turn_hooks.py": 1.9,
-  "tst/unit/task_step/test_prompt_agent_snapshots.py": 2.8,
-  "tst/unit/task_step/test_prompt_agent_triggers.py": 1.1,
+  "tst/unit/task_step/test_prompt_agent_notifications.py": 0.4,
+  "tst/unit/task_step/test_prompt_agent_post_turn_hooks.py": 1.2,
+  "tst/unit/task_step/test_prompt_agent_snapshots.py": 2.4,
+  "tst/unit/task_step/test_prompt_agent_triggers.py": 0.8,
   "tst/unit/task_step/test_prompt_agent_unreachable.py": 0.0,
   "tst/unit/task_step/test_prompt_agent_user_model.py": 0.0,
-  "tst/unit/task_step/test_prompt_agent_user_side.py": 0.4,
+  "tst/unit/task_step/test_prompt_agent_user_side.py": 0.5,
   "tst/unit/task_step/test_recorded_models.py": 0.1,
-  "tst/unit/task_step/test_register_agent_triggers.py": 0.2,
-  "tst/unit/task_step/test_register_env_triggers.py": 7.5,
+  "tst/unit/task_step/test_register_agent_triggers.py": 0.1,
+  "tst/unit/task_step/test_register_env_triggers.py": 7.3,
   "tst/unit/task_step/test_reset_env.py": 0.1,
   "tst/unit/task_step/test_review.py": 0.2,
-  "tst/unit/task_step/test_run_code.py": 18.3,
+  "tst/unit/task_step/test_run_code.py": 16.5,
   "tst/unit/task_step/test_sandbox_utils_agent_container.py": 0.0,
   "tst/unit/task_step/test_sandbox_utils_logs.py": 0.1,
-  "tst/unit/task_step/test_snapshot_agent_state.py": 0.2,
+  "tst/unit/task_step/test_snapshot_agent_state.py": 0.1,
   "tst/unit/task_step/test_snapshot_env.py": 1.1,
-  "tst/unit/task_step/test_snapshot_env_env_binding.py": 0.1,
+  "tst/unit/task_step/test_snapshot_env_env_binding.py": 0.2,
   "tst/unit/task_step/test_step_overrides_agent_and_model.py": 0.2,
-  "tst/unit/task_step/test_teardown_sandboxes.py": 0.4,
+  "tst/unit/task_step/test_teardown_sandboxes.py": 0.2,
   "tst/unit/task_step/test_universe_comparison.py": 0.1,
   "tst/unit/task_step/test_validation_gate_aggregator.py": 0.1,
   "tst/unit/task_step/test_verify_a2a_agent_mcp.py": 0.0,
-  "tst/unit/task_step/test_verify_a2a_builtin_tools.py": 0.1,
+  "tst/unit/task_step/test_verify_a2a_builtin_tools.py": 0.0,
   "tst/unit/task_step/test_verify_spec_conformance.py": 0.2,
-  "tst/unit/task_step/test_verify_universe_agent_judge.py": 0.1,
+  "tst/unit/task_step/test_verify_universe_agent_judge.py": 0.2,
   "tst/unit/task_step/test_verify_universe_roundtrip.py": 0.2,
   "tst/unit/task_step/thread_work_test.py": 0.6,
-  "tst/unit/task_step/unwritten_local_agent_test.py": 0.9,
-  "tst/unit/task_step/verifiers/judge_short_keys_test.py": 0.1,
-  "tst/unit/task_step/verifiers/judge_utils/test_frame_selection.py": 0.2,
+  "tst/unit/task_step/unwritten_local_agent_test.py": 0.3,
+  "tst/unit/task_step/verifiers/judge_short_keys_test.py": 0.0,
+  "tst/unit/task_step/verifiers/judge_utils/test_frame_selection.py": 0.1,
   "tst/unit/task_step/verifiers/judge_utils/test_frame_selection_tool_name.py": 0.0,
-  "tst/unit/task_step/verifiers/judge_utils/test_judge_output_format.py": 0.2,
+  "tst/unit/task_step/verifiers/judge_utils/test_judge_output_format.py": 0.3,
   "tst/unit/task_step/verifiers/judge_utils/test_trajectory_filter.py": 0.0,
-  "tst/unit/task_step/verifiers/run_container_unit_tests_verifier_test.py": 0.9,
+  "tst/unit/task_step/verifiers/run_container_unit_tests_verifier_test.py": 1.2,
   "tst/unit/task_step/verifiers/test_env_outcome_verifier_step.py": 0.1,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_criteria_override.py": 0.1,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_grade_up_to_turn.py": 0.2,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_batches.py": 0.2,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_criteria_override.py": 0.0,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_grade_up_to_turn.py": 0.1,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_batches.py": 0.3,
   "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_model.py": 0.0,
   "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_retry.py": 0.1,
   "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_teardown.py": 0.0,
   "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_timeout.py": 0.0,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_trajectory.py": 0.5,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_judge_trajectory.py": 0.3,
   "tst/unit/task_step/verifiers/test_rubrics_verifier_mistakes_entry.py": 0.2,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_multiturn.py": 0.7,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_nonfinite_scores.py": 3.1,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_per_criterion.py": 0.4,
-  "tst/unit/task_step/verifiers/test_rubrics_verifier_screenshots.py": 4.4,
-  "tst/unit/task_step/verifiers/test_run_context.py": 1.6,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_multiturn.py": 0.9,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_nonfinite_scores.py": 2.9,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_per_criterion.py": 0.5,
+  "tst/unit/task_step/verifiers/test_rubrics_verifier_screenshots.py": 4.6,
+  "tst/unit/task_step/verifiers/test_run_context.py": 1.4,
   "tst/unit/task_step/verifiers/test_score_parity.py": 0.0,
   "tst/unit/task_step/verifiers/test_trajectory_mistakes_format.py": 0.2,
-  "tst/unit/task_step/verifiers/test_verify_sandbox.py": 0.2,
-  "tst/unit/test_capabilities.py": 0.3,
-  "tst/unit/test_check_plugin_api.py": 21.1,
+  "tst/unit/task_step/verifiers/test_verify_sandbox.py": 0.1,
+  "tst/unit/test_capabilities.py": 0.2,
+  "tst/unit/test_check_plugin_api.py": 10.5,
   "tst/unit/test_check_skip_policy.py": 0.3,
   "tst/unit/test_clean_install_wheel.py": 0.1,
   "tst/unit/test_client_identity.py": 0.0,
-  "tst/unit/test_infra_build_script.py": 1.3,
+  "tst/unit/test_infra_build_script.py": 0.6,
   "tst/unit/test_infra_images_script.py": 0.6,
-  "tst/unit/test_mirror_base_images_script.py": 0.1,
-  "tst/unit/test_optional_extras_stay_optional.py": 592.4,
+  "tst/unit/test_mirror_base_images_script.py": 0.2,
+  "tst/unit/test_optional_extras_stay_optional.py": 250.4,
   "tst/unit/test_pypi_release_script.py": 0.3,
-  "tst/unit/test_release_infra_images.py": 0.7,
-  "tst/unit/test_release_protocol_pins.py": 0.3,
-  "tst/unit/test_runtime_dependencies_are_imported.py": 33.9,
-  "tst/unit/test_shards.py": 13.2,
-  "tst/unit/test_slow_test_durations_script.py": 0.2,
-  "tst/unit/test_subclass_hooks_are_annotated.py": 2.2,
-  "tst/unit/test_tls_verification.py": 0.2,
-  "tst/unit/training/chat_test.py": 14.7,
-  "tst/unit/training/harness_test.py": 24.0,
-  "tst/unit/training/nemo_gym_test.py": 4.1,
+  "tst/unit/test_release_infra_images.py": 1.0,
+  "tst/unit/test_release_protocol_pins.py": 0.1,
+  "tst/unit/test_runtime_dependencies_are_imported.py": 15.4,
+  "tst/unit/test_shards.py": 10.6,
+  "tst/unit/test_slow_test_durations_script.py": 0.3,
+  "tst/unit/test_subclass_hooks_are_annotated.py": 4.3,
+  "tst/unit/test_tls_verification.py": 0.1,
+  "tst/unit/training/chat_test.py": 12.5,
+  "tst/unit/training/harness_test.py": 13.6,
+  "tst/unit/training/nemo_gym_test.py": 3.0,
   "tst/unit/training/sessions_test.py": 0.2,
-  "tst/unit/training/skyrl_test.py": 6.4,
-  "tst/unit/training/tools_test.py": 0.3,
-  "tst/unit/training/trl_test.py": 39.2,
-  "tst/unit/training/verl_test.py": 3.6,
-  "tst/unit/utils/docker/build_test.py": 0.4,
-  "tst/unit/utils/docker/context_test.py": 0.6,
-  "tst/unit/utils/docker/dockerfile_test.py": 1.0,
-  "tst/unit/utils/docker/installed_test.py": 0.2,
-  "tst/unit/utils/docker/lock_test.py": 0.2,
+  "tst/unit/training/skyrl_test.py": 6.2,
+  "tst/unit/training/tools_test.py": 0.2,
+  "tst/unit/training/trl_test.py": 38.1,
+  "tst/unit/training/verl_test.py": 3.8,
+  "tst/unit/utils/docker/build_test.py": 0.3,
+  "tst/unit/utils/docker/context_test.py": 0.3,
+  "tst/unit/utils/docker/dockerfile_test.py": 0.4,
+  "tst/unit/utils/docker/installed_test.py": 0.1,
+  "tst/unit/utils/docker/lock_test.py": 0.4,
   "tst/unit/utils/docker/metadata_test.py": 0.1,
-  "tst/unit/utils/docker/prune_test.py": 0.8,
-  "tst/unit/utils/exec_retry_test.py": 0.1,
+  "tst/unit/utils/docker/prune_test.py": 0.4,
+  "tst/unit/utils/exec_retry_test.py": 0.2,
   "tst/unit/utils/test_card_naming_github_token.py": 0.0,
-  "tst/unit/utils/test_paths.py": 0.2
+  "tst/unit/utils/test_paths.py": 0.1
  }
 }
diff --git a/tst/unit/env/envs/test_computer_env.py b/tst/unit/env/envs/test_computer_env.py
index 3679af1f1..5bf92da16 100644
--- a/tst/unit/env/envs/test_computer_env.py
+++ b/tst/unit/env/envs/test_computer_env.py
@@ -46,6 +46,7 @@
                                                probing, resolve_in_base)
 from agent_env.env.envs.computer.utils import sites as computer_sites
 from agent_env.env.envs.computer.utils.composer import Composing
+from agent_env.store.image_store.registry_api import RegistryRefusedError
 from agent_env.env.envs.computer.utils.probing import _probe
 from agent_env.env.envs.computer.env import COMPUTER_TOOLS, ComputerEnv
 from agent_env.env.envs.computer import app_env
@@ -734,6 +735,77 @@ def test_env_build_by_an_installed_alias_composes_under_the_id_of_the_env_it_nam
         "@local/acme-kit/kit/desktop__computer").image().image_name])
 
 
+MIRROR = "ghcr.io/org/computers"
+
+
+def _mirrored(docker, monkeypatch, read=None):
+    """Move every composed image out of the env's image store into the computer image mirror, as a fresh runner of CI
+    finds them, and record each copy back: the mirror's refs, read with ``read`` when given."""
+    stored = {ref: digest for ref, digest in docker.registry.tags.items()
+              if f"/{composed.REPOSITORY}:" in ref and ":index-" not in ref}
+    for ref in stored:
+        del docker.registry.tags[ref]
+    mirror = {f"{MIRROR}:{composed.mirror_tag(ref.rpartition(':')[2])}": digest for ref, digest in stored.items()}
+    copied, real = [], composer.pin_if_served
+
+    def pin(ref, auth):
+        if ref.startswith(f"{MIRROR}:"):
+            return read(ref) if read else (f"{ref}@{mirror[ref]}" if ref in mirror else None)
+        return real(ref, auth)
+
+    def copy(source, target, source_auth, target_auth):
+        copied.append((source.partition("@")[0], target))
+        docker.registry.tags[target] = source.rpartition("@")[2]
+
+    monkeypatch.setattr(composer, "pin_if_served", pin)
+    monkeypatch.setattr(composer, "copy_image", copy)
+    monkeypatch.setattr(get_config(), "computer_image_mirror", MIRROR)
+    return stored, copied
+
+
+def test_an_image_the_store_lacks_is_copied_from_the_computer_image_mirror_and_reused_rather_than_built(base, driver,
+                                                                                                        docker,
+                                                                                                        monkeypatch):
+    first = _put(base, driver)
+    stored, copied = _mirrored(docker, monkeypatch)
+
+    second = _put(base, driver, id="@local/~/kit/other", environment_name="other")
+
+    reused = Env.get(second.id).metadata["composed"]["container"]
+    assert len(docker.builds) == 2 and all(r["reused"] for r in reused.values())
+    assert sorted(copied) == sorted((f"{MIRROR}:{composed.mirror_tag(ref.rpartition(':')[2])}", ref) for ref in stored)
+    assert {arch: r["image"] for arch, r in reused.items()} == {
+        arch: r["image"] for arch, r in Env.get(first.id).metadata["composed"]["container"].items()}
+
+
+def test_a_change_to_the_code_that_composes_an_image_misses_the_mirror_and_builds_it(base, driver, docker,
+                                                                                    monkeypatch):
+    _put(base, driver)
+    _, copied = _mirrored(docker, monkeypatch)
+    monkeypatch.setattr(composed, "composition", lambda: "sha256:" + "f" * 64)
+
+    second = _put(base, driver, id="@local/~/kit/other", environment_name="other")
+
+    assert len(docker.builds) == 4 and copied == []
+    assert not any(r["reused"] for r in Env.get(second.id).metadata["composed"]["container"].values())
+
+
+def test_a_computer_image_mirror_that_cant_be_read_leaves_the_image_to_be_built(base, driver, docker, monkeypatch,
+                                                                               caplog):
+    _put(base, driver)
+
+    def refused(ref):
+        raise RegistryRefusedError(f"{ref}: ghcr.io refused to serve it (HTTP 403)")
+
+    _, copied = _mirrored(docker, monkeypatch, read=refused)
+    with caplog.at_level(logging.WARNING, logger=composer.__name__):
+        second = _put(base, driver, id="@local/~/kit/other", environment_name="other")
+
+    built = Env.get(second.id).metadata["composed"]["container"]
+    assert len(docker.builds) == 4 and not any(r["reused"] for r in built.values()) and copied == []
+    assert f"the computer image mirror {MIRROR} couldn't give" in caplog.text
+
+
 def test_builds_of_one_env_at_once_keep_each_others_pairs_and_a_failure_doesnt_replace_a_built_one(base, driver,
                                                                                                     docker,
                                                                                                     monkeypatch):
diff --git a/tst/unit/store/registry_api_test.py b/tst/unit/store/registry_api_test.py
index aec0d54fe..120992dd8 100644
--- a/tst/unit/store/registry_api_test.py
+++ b/tst/unit/store/registry_api_test.py
@@ -327,3 +327,108 @@ def ghcr(request):
     assert json.loads(request.content) == {"schemaVersion": 2, "mediaType": written, "manifests": [
         amd64_entry, *(children if arm64 == "index" else [{**amd64_entry, "digest": OTHER,
                                                            "platform": {"architecture": "arm64", "os": "linux"}}])]}
+
+
+def _sha(data: bytes) -> str:
+    return f"sha256:{hashlib.sha256(data).hexdigest()}"
+
+
+def test_an_image_is_copied_by_its_digest_with_only_the_blobs_the_target_lacks_and_its_manifests_byte_for_byte(
+        fake_registry):
+    config, kept, missing = b'{"architecture": "amd64"}', b"layer the target has", b"layer it lacks"
+    image = json.dumps({"mediaType": OCI_IMAGE, "config": {"digest": _sha(config)},
+                        "layers": [{"digest": _sha(kept)}, {"digest": _sha(missing)}]}).encode()
+    index = json.dumps({"mediaType": OCI_INDEX, "manifests": [{"digest": _sha(image)}]}).encode()
+    source = {_sha(index): (OCI_INDEX, index), _sha(image): (OCI_IMAGE, image)}
+    blobs = {_sha(blob): blob for blob in (config, kept, missing)}
+    target_blobs, target_manifests = {_sha(kept): kept}, {}
+
+    def registries(request):
+        path = request.url.path
+        if request.url.host == "ghcr.io":
+            if "/blobs/" in path:
+                return httpx.Response(200, content=blobs[path.rpartition("/")[2]])
+            media, body = source[path.rpartition("/")[2]]
+            return httpx.Response(200, content=body, headers={"Content-Type": media})
+        if request.method == "HEAD":
+            return httpx.Response(200 if path.rpartition("/")[2] in target_blobs else 404)
+        if request.method == "POST":
+            return httpx.Response(202, headers={"Location": "/v2/agentenv-computers/blobs/uploads/u1?_state=s"})
+        if "/blobs/uploads/" in path:
+            assert request.url.params["_state"] == "s"
+            target_blobs[request.url.params["digest"]] = request.read()
+            return httpx.Response(201)
+        target_manifests[path.rpartition("/")[2]] = (request.headers["content-type"], request.content)
+        return httpx.Response(201)
+
+    seen = fake_registry(registries)
+    registry_api.copy_image(f"ghcr.io/org/computers:k@{_sha(index)}", "localhost:5000/agentenv-computers:k", None, None)
+
+    assert target_blobs == blobs
+    assert [r.url.params["digest"] for r in seen if r.method == "PUT" and "/blobs/" in r.url.path] == [
+        _sha(config), _sha(missing)]
+    assert target_manifests == {_sha(image): (OCI_IMAGE, image), _sha(index): (OCI_INDEX, index), "k": (OCI_INDEX, index)}
+
+
+def test_a_copy_needs_the_digest_it_copies(fake_registry):
+    seen = fake_registry(lambda request: httpx.Response(500))
+
+    with pytest.raises(ValueError, match="names none"):
+        registry_api.copy_image("ghcr.io/org/computers:k", "localhost:5000/agentenv-computers:k", None, None)
+    assert seen == []
+
+
+def test_a_copy_to_ghcr_asks_again_for_the_push_token_its_first_challenge_didnt_give(fake_registry):
+    config = b'{"architecture": "amd64"}'
+    image = json.dumps({"mediaType": OCI_IMAGE, "config": {"digest": _sha(config)}, "layers": []}).encode()
+    pushed = []
+
+    def registries(request):
+        if request.url.host == "localhost":
+            if "/blobs/" in request.url.path:
+                return httpx.Response(200, content=config)
+            return httpx.Response(200, content=image, headers={"Content-Type": OCI_IMAGE})
+        if request.url.path == "/token":
+            assert request.headers["authorization"] == "Basic " + base64.b64encode(b"bot:t").decode()
+            return httpx.Response(200, json={"token": request.url.params["scope"]})
+        writes = request.method in ("POST", "PUT")
+        scope = "repository:org/computers:pull,push" if writes else "repository:org/computers:pull"
+        if request.headers.get("authorization") not in (f"Bearer {scope}", "Bearer repository:org/computers:pull,push"):
+            return httpx.Response(401, headers={"WWW-Authenticate": f'Bearer realm="https://ghcr.io/token",scope="{scope}"'})
+        if request.method == "HEAD":
+            return httpx.Response(404)
+        if request.method == "POST":
+            return httpx.Response(202, headers={"Location": "/v2/org/computers/blobs/uploads/u1"})
+        pushed.append(request.url.path)
+        return httpx.Response(201)
+
+    fake_registry(registries)
+    registry_api.copy_image(f"localhost:5000/agentenv-computers:k@{_sha(image)}", "ghcr.io/org/computers:k", None,
+                            RegistryAuth("ghcr.io", "bot", "t"))
+
+    assert pushed == ["/v2/org/computers/blobs/uploads/u1", f"/v2/org/computers/manifests/{_sha(image)}",
+                      "/v2/org/computers/manifests/k"]
+
+
+@pytest.mark.parametrize("location", ["https://elsewhere.example/v2/org/computers/blobs/uploads/u1",
+                                      "http://ghcr.io/v2/org/computers/blobs/uploads/u1"],
+                         ids=["another-host", "plain-http"])
+def test_an_upload_the_registry_sends_elsewhere_is_refused_before_its_credentials_go(fake_registry, location):
+    config = b'{"architecture": "amd64"}'
+    image = json.dumps({"mediaType": OCI_IMAGE, "config": {"digest": _sha(config)}, "layers": []}).encode()
+
+    def registries(request):
+        if request.url.host == "localhost":
+            if "/blobs/" in request.url.path:
+                return httpx.Response(200, content=config)
+            return httpx.Response(200, content=image, headers={"Content-Type": OCI_IMAGE})
+        assert request.url.host == "ghcr.io" and request.url.scheme == "https", request.url
+        if request.method == "HEAD":
+            return httpx.Response(404)
+        return httpx.Response(202, headers={"Location": location})
+
+    fake_registry(registries)
+
+    with pytest.raises(ValueError, match="which its credentials don't go to"):
+        registry_api.copy_image(f"localhost:5000/agentenv-computers:k@{_sha(image)}", "ghcr.io/org/computers:k", None,
+                                RegistryAuth("ghcr.io", "bot", "t"))
diff --git a/tst/unit/test_computer_image_mirror_scripts.py b/tst/unit/test_computer_image_mirror_scripts.py
new file mode 100644
index 000000000..54f91da22
--- /dev/null
+++ b/tst/unit/test_computer_image_mirror_scripts.py
@@ -0,0 +1,109 @@
+"""The CI computer image mirror's two scripts: what a runner shares into it, and which of its versions a prune deletes."""
+
+from __future__ import annotations
+
+import datetime
+import io
+import json
+import sys
+
+import pytest
+
+from tst.util.scripts import load_script
+
+NOW = datetime.datetime(2026, 11, 20, 12, tzinfo=datetime.timezone.utc)
+CUTOFF = NOW - datetime.timedelta(days=7)
+KEY, OTHER = "c" * 16 + "-" + "a" * 64, "c" * 16 + "-" + "b" * 64
+RAW, RAW_OTHER = "a" * 64, "b" * 64
+
+
+def _version(name: str, created: str, *tags: str) -> dict:
+    return {"id": hash(name) % 10_000, "name": name, "created_at": created, "metadata": {"container": {"tags": list(tags)}}}
+
+
+@pytest.fixture
+def prune():
+    return load_script("prune_computer_images.py")
+
+
+def test_an_image_last_seen_within_the_window_is_kept_and_one_last_seen_before_it_is_deleted(prune):
+    used = _version("sha256:1", "2026-10-01T00:00:00Z", KEY, f"{KEY}-seen-20261001", f"{KEY}-seen-20261115")
+    unused = _version("sha256:2", "2026-10-01T00:00:00Z", OTHER, f"{OTHER}-seen-20261112")
+
+    assert prune.stale_versions([used, unused], CUTOFF, lambda digest: []) == [unused]
+
+
+def test_an_image_seen_on_the_cutoffs_day_is_kept_through_that_day(prune):
+    edge = _version("sha256:1", "2026-10-01T00:00:00Z", KEY, f"{KEY}-seen-20261113")
+
+    assert prune.stale_versions([edge], CUTOFF, lambda digest: []) == []
+
+
+def test_a_version_uploaded_within_the_window_is_kept_though_no_run_has_tagged_it_seen(prune):
+    fresh = _version("sha256:1", "2026-11-19T00:00:00Z")
+    old = _version("sha256:2", "2026-11-01T00:00:00Z")
+
+    assert prune.stale_versions([fresh, old], CUTOFF, lambda digest: []) == [old]
+
+
+def test_the_platform_manifests_a_kept_index_lists_are_kept_and_a_deleted_ones_are_not(prune):
+    kept = _version("sha256:k", "2026-10-01T00:00:00Z", KEY, f"{KEY}-seen-20261119")
+    dropped = _version("sha256:d", "2026-10-01T00:00:00Z", OTHER, f"{OTHER}-seen-20261001")
+    children = {"sha256:k": ["sha256:k-amd64", "sha256:k-attestation"], "sha256:d": ["sha256:d-amd64"]}
+    untagged = [_version(digest, "2026-10-01T00:00:00Z") for digest in ("sha256:k-amd64", "sha256:k-attestation",
+                                                                         "sha256:d-amd64")]
+
+    stale = prune.stale_versions([kept, dropped, *untagged], CUTOFF, lambda digest: children.get(digest, []))
+
+    assert [version["name"] for version in stale] == ["sha256:d", "sha256:d-amd64"]
+
+
+def test_a_prune_without_the_package_deletes_nothing_passes_and_says_why(prune, monkeypatch, capsys):
+    def missing(method, url):
+        raise prune.urllib.error.HTTPError(url, 404, "Not Found", {}, io.BytesIO(b""))
+
+    monkeypatch.setattr(prune, "_github", missing)
+    monkeypatch.setattr(sys, "argv", ["prune_computer_images.py", "org", "agentenv-ci-computers"])
+
+    assert prune.main() == 0
+    assert "no package org/agentenv-ci-computers, or this repository has no access to it" in capsys.readouterr().out
+
+
+def test_a_runner_shares_each_image_under_its_mirror_tag_and_todays_seen_tag_and_leaves_its_indexes(monkeypatch,
+                                                                                                    capsys):
+    share = load_script("share_computer_images.py")
+    tags = {"tags": [RAW, f"index-{RAW_OTHER}", RAW_OTHER]}
+    copies = []
+    monkeypatch.setattr(share.urllib.request, "urlopen", lambda url: io.BytesIO(json.dumps(tags).encode()))
+    monkeypatch.setattr(share, "pin_digest", lambda ref, auth: f"{ref}@sha256:{ref[-64:]}")
+    monkeypatch.setattr(share, "mirror_tag", lambda key: f"{'c' * 16}-{key}")
+    monkeypatch.setattr(share, "copy_image", lambda source, target, source_auth, auth: copies.append(
+        (source.rpartition("@")[2], target, auth.username)))
+    monkeypatch.setattr(share, "pin_if_served", lambda ref, auth: f"{ref}@sha256:{RAW}")
+    monkeypatch.setattr(share.datetime, "datetime", type("Fixed", (datetime.datetime,), {"now": staticmethod(lambda tz: NOW)}))
+    monkeypatch.setenv("GITHUB_ACTOR", "bot")
+    monkeypatch.setenv("GITHUB_TOKEN", "t")
+    monkeypatch.setattr(sys, "argv", ["share_computer_images.py", "ghcr.io/org/agentenv-ci-computers"])
+
+    assert share.main() == 0
+    assert copies == [(f"sha256:{raw}", f"ghcr.io/org/agentenv-ci-computers:{tag}", "bot")
+                      for raw, key in ((RAW, KEY), (RAW_OTHER, OTHER)) for tag in (key, f"{key}-seen-20261120")]
+    assert "::warning::" not in capsys.readouterr().out
+
+
+def test_a_mirror_the_composer_cant_read_anonymously_warns_to_make_it_public(monkeypatch, capsys):
+    share = load_script("share_computer_images.py")
+    monkeypatch.setattr(share.urllib.request, "urlopen", lambda url: io.BytesIO(json.dumps({"tags": [RAW]}).encode()))
+    monkeypatch.setattr(share, "pin_digest", lambda ref, auth: f"{ref}@sha256:{RAW}")
+    monkeypatch.setattr(share, "copy_image", lambda *args: None)
+
+    def private(ref, auth):
+        raise ValueError(f"{ref}: ghcr.io refused to serve it (HTTP 403)")
+
+    monkeypatch.setattr(share, "pin_if_served", private)
+    monkeypatch.setenv("GITHUB_ACTOR", "bot")
+    monkeypatch.setenv("GITHUB_TOKEN", "t")
+    monkeypatch.setattr(sys, "argv", ["share_computer_images.py", "ghcr.io/org/agentenv-ci-computers"])
+
+    assert share.main() == 0
+    assert "make the package public" in capsys.readouterr().out
diff --git a/tst/unit/test_prune_registry_script.py b/tst/unit/test_prune_registry_script.py
deleted file mode 100644
index 2b842562c..000000000
--- a/tst/unit/test_prune_registry_script.py
+++ /dev/null
@@ -1,97 +0,0 @@
-"""``.github/scripts/prune_registry.py``, which keeps only the computer images a slow-tier run used before the local
-registry's storage is cached: their tags, the manifests those reach, and the layer links garbage collection leaves."""
-
-from __future__ import annotations
-
-import ast
-import hashlib
-import json
-import sys
-from pathlib import Path
-
-import pytest
-
-from tst.util.scripts import SCRIPTS, load_script
-
-SCRIPT = SCRIPTS / "prune_registry.py"
-REPOSITORY = "agentenv-computers"
-_USED, _STALE = "a" * 64, "b" * 64
-
-
-@pytest.fixture
-def script():
-    return load_script(SCRIPT.name)
-
-
-def test_it_imports_only_the_standard_library():
-    """It runs under the runner's python3 with sudo, outside the project's environment."""
-    imported = set()
-    for node in ast.walk(ast.parse(SCRIPT.read_text())):
-        if isinstance(node, ast.Import):
-            imported |= {alias.name.split(".")[0] for alias in node.names}
-        elif isinstance(node, ast.ImportFrom) and node.level == 0:
-            imported.add(node.module.split(".")[0])
-    assert imported <= set(sys.stdlib_module_names) | {"__future__"}
-
-
-def test_a_tag_is_used_when_the_log_has_a_request_for_its_manifest_by_it(script):
-    log = "\n".join([
-        f'time="t" level=info msg="response completed" http.request.method=HEAD '
-        f'http.request.uri="/v2/{REPOSITORY}/manifests/{_USED}" http.response.status=200',
-        f'172.17.0.1 - - [10/Nov/2026:05:00:00 +0000] "PUT /v2/{REPOSITORY}/manifests/{"c" * 64} HTTP/1.1" 201 0',
-        f'172.17.0.1 - - [10/Nov/2026:05:00:01 +0000] "GET /v2/{REPOSITORY}/manifests/sha256:{"d" * 64} HTTP/1.1" 200',
-        f'172.17.0.1 - - [10/Nov/2026:05:00:02 +0000] "HEAD /v2/other/manifests/{_STALE} HTTP/1.1" 200 0',
-    ])
-
-    assert script.used_tags(log, REPOSITORY) == {_USED, "c" * 64}
-
-
-def test_pruning_keeps_the_used_tags_and_every_manifest_their_index_lists(script, tmp_path):
-    platforms = [_blob(tmp_path, {"layers": [], "n": n}) for n in range(2)]
-    index = _blob(tmp_path, {"manifests": [{"digest": digest} for digest in platforms]})
-    stale = _blob(tmp_path, {"layers": [], "n": "stale"})
-    _tag(tmp_path, _USED, index)
-    _tag(tmp_path, _STALE, stale)
-    for digest in (index, *platforms, stale):
-        _revision(tmp_path, digest)
-
-    kept, dropped = script.prune(tmp_path, REPOSITORY, {_USED})
-
-    manifests = tmp_path / "docker/registry/v2/repositories" / REPOSITORY / "_manifests"
-    assert (kept, dropped) == (1, 1)
-    assert sorted(p.name for p in (manifests / "tags").iterdir()) == [_USED]
-    assert {p.name for p in (manifests / "revisions/sha256").iterdir()} == {d.removeprefix("sha256:")
-                                                                             for d in (index, *platforms)}
-
-
-def test_links_to_layers_garbage_collection_freed_are_dropped(script, tmp_path):
-    kept = _blob(tmp_path, {"layer": "kept"})
-    layers = tmp_path / "docker/registry/v2/repositories" / REPOSITORY / "_layers/sha256"
-    for digest in (kept, "sha256:" + "e" * 64):
-        (layers / digest.removeprefix("sha256:")).mkdir(parents=True)
-        (layers / digest.removeprefix("sha256:") / "link").write_text(digest)
-
-    assert script.drop_freed_links(tmp_path, REPOSITORY) == 1
-    assert [p.name for p in layers.iterdir()] == [kept.removeprefix("sha256:")]
-
-
-def _blob(storage: Path, content: dict) -> str:
-    data = json.dumps(content).encode()
-    hex_digest = hashlib.sha256(data).hexdigest()
-    path = storage / "docker/registry/v2/blobs/sha256" / hex_digest[:2] / hex_digest / "data"
-    path.parent.mkdir(parents=True)
-    path.write_bytes(data)
-    return f"sha256:{hex_digest}"
-
-
-def _tag(storage: Path, tag: str, digest: str) -> None:
-    current = storage / "docker/registry/v2/repositories" / REPOSITORY / "_manifests/tags" / tag / "current"
-    current.mkdir(parents=True)
-    (current / "link").write_text(digest)
-
-
-def _revision(storage: Path, digest: str) -> None:
-    revision = (storage / "docker/registry/v2/repositories" / REPOSITORY / "_manifests/revisions/sha256"
-                / digest.removeprefix("sha256:"))
-    revision.mkdir(parents=True)
-    (revision / "link").write_text(digest)