diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 90428a1e..7c0b9655 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,6 +14,7 @@ on:
     branches:
       - main
       - staging
+      - 'task-*'
   workflow_dispatch:
 
 env:
@@ -56,8 +57,8 @@ jobs:
             && github.event.pull_request.base.repo.full_name == github.event.pull_request.head.repo.full_name
         with:
           commit_message: automatically run ormolu
-  build-exe:
-    name: Build share-api executable
+  build-exes:
+    name: Build executables
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
@@ -83,12 +84,19 @@ jobs:
             --copy-bins \
             ${{ (env.is_published_build && '--ghc-options -O2') || '--fast' }}
 
-      - name: Save exes for docker build
+      - name: Save exes for share-api docker build
         uses: actions/upload-artifact@v4
         with:
           name: share-api-exe
           path: ${{env.share_local_bin}}
 
+      - name: Save exes for share-task-runner docker build
+        if: ${{ (github.event_name == 'push' && startsWith(github.ref, 'refs/heads/task-')) || (github.event_name == 'pull_request' && startsWith(github.head_ref, 'task-')) }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: share-task-runner-exe
+          path: ${{env.share_local_bin}}
+
       - name: save stack caches
         if: |
           !cancelled()
@@ -97,12 +105,95 @@ jobs:
         with:
           cache-prefix: ${{env.exe_cache_prefix}}
 
-  # A separate job for docker build because it requires elevated github token permissions.
-  docker-build:
+  # Separate jobs for the docker builds because they requires elevated github token permissions.
+  share-task-runner-docker-build:
+    if: ${{ (github.event_name == 'push' && startsWith(github.ref, 'refs/heads/task-')) || (github.event_name == 'pull_request' && startsWith(github.head_ref, 'task-')) }}
+    env:
+      container_registry: ghcr.io
+      docker_image_name: unisoncomputing/share-task-runner
+    needs: [build-exes]
+    runs-on: ubuntu-24.04
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      # Allow uploading the docker image to the container registry
+      packages: write
+      # Allow creating and updating the artifact attestation
+      attestations: write
+      # Required to get user information for building attestations
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # Don't need unison submodule for docker image build
+          submodules: false
+
+      # Downloads the artifact that contains the share-api-exe from the previous job.
+      - uses: actions/download-artifact@v4
+        with:
+          name: share-task-runner-exe
+          path: ./docker/tmp/
+
+      # Configure Docker's builder,
+      # This seems necessary to support docker cache layers.
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
+
+
+      # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
+      - name: Log in to the Container registry
+        uses: docker/login-action@e92390c5fb421da1463c202d546fed0ec5c39f20
+        with:
+          registry: ${{ env.container_registry }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.container_registry }}/${{ env.docker_image_name }}
+          tags: |
+            type=sha,priority=1000,format=short,prefix={{branch}}_{{date 'YYYY-MM-DD-HH-mm'}}_gitref-
+            type=sha,format=long
+
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
+        with:
+          context: ./docker/
+          file: ./docker/share-task-runner.Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # Use github actions cache for docker image layers
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            SHARE_COMMIT=${{ github.sha }}
+          # Save image locally for use in tests even if we don't push it.
+          outputs: type=docker,dest=/tmp/share-docker-image.tar # export docker image
+
+      # This step generates an artifact attestation for the image, which is an unforgeable statement about where and how it was built. It increases supply chain security for people who consume the image. For more information, see "[AUTOTITLE](/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds)."
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1.1.0
+        with:
+          subject-name: ${{ env.container_registry }}/${{ env.docker_image_name}}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true
+
+
+  # Separate jobs for the docker builds because they requires elevated github token permissions.
+  share-api-docker-build:
     env:
       container_registry: ghcr.io
-      docker_image_name: ${{ github.repository }}
-    needs: [build-exe]
+      docker_image_name: unisoncomputing/share-api
+    needs: [build-exes]
     runs-on: ubuntu-24.04
     # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
     permissions:
@@ -158,6 +249,7 @@ jobs:
         uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
         with:
           context: ./docker/
+          file: ./docker/share-api.Dockerfile
           push: ${{ env.is_published_build }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
@@ -186,7 +278,7 @@ jobs:
 
   # A separate job for docker build because it requires elevated github token permissions.
   transcript-tests:
-    needs: [build-exe, docker-build]
+    needs: [build-exes, share-api-docker-build]
     runs-on: ubuntu-24.04
 
     steps:
diff --git a/docker/share-entrypoint.sh b/docker/share-api-entrypoint.sh
similarity index 100%
rename from docker/share-entrypoint.sh
rename to docker/share-api-entrypoint.sh
diff --git a/docker/Dockerfile b/docker/share-api.Dockerfile
similarity index 73%
rename from docker/Dockerfile
rename to docker/share-api.Dockerfile
index c0502df2..8e0d3ee2 100644
--- a/docker/Dockerfile
+++ b/docker/share-api.Dockerfile
@@ -6,13 +6,13 @@ RUN openssl genrsa -out /etc/ssl/private/share.key &&\
     update-locale LANG=C.UTF-8
 ENV LANG=C.UTF-8
 
-COPY share-entrypoint.sh /usr/local/bin/share-entrypoint
-RUN chmod 555 /usr/local/bin/share-entrypoint
+COPY share-api-entrypoint.sh /usr/local/bin/share-api-entrypoint
+RUN chmod 555 /usr/local/bin/share-api-entrypoint
 
 COPY tmp/share-api /usr/local/bin/share
 RUN chmod 555 /usr/local/bin/share
 
-ENTRYPOINT /usr/local/bin/share-entrypoint
+ENTRYPOINT /usr/local/bin/share-api-entrypoint
 
 ARG SHARE_COMMIT
 ENV SHARE_COMMIT=$SHARE_COMMIT
diff --git a/docker/share-task-runner-entrypoint.sh b/docker/share-task-runner-entrypoint.sh
new file mode 100644
index 00000000..a8054844
--- /dev/null
+++ b/docker/share-task-runner-entrypoint.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -ex
+
+echo SHARE_REDIS: "$SHARE_REDIS"
+
+if [ -n "$NOMAD_PORT_enlil_http" ]; then
+    export SHARE_SERVER_PORT="$NOMAD_PORT_enlil_http"
+fi
+
+export SHARE_IP=0.0.0.0
+
+exec 2>&1
+exec /usr/local/bin/share-task-runner
diff --git a/docker/share-task-runner.Dockerfile b/docker/share-task-runner.Dockerfile
new file mode 100644
index 00000000..56a67014
--- /dev/null
+++ b/docker/share-task-runner.Dockerfile
@@ -0,0 +1,18 @@
+FROM debian:trixie
+RUN apt-get  update && apt-get install -y ssl-cert libpq5 ca-certificates curl locales
+RUN openssl genrsa -out /etc/ssl/private/share.key &&\
+    echo "C.UTF-8 UTF-8" > /etc/locale.gen &&\
+    dpkg-reconfigure --frontend=noninteractive locales &&\
+    update-locale LANG=C.UTF-8
+ENV LANG=C.UTF-8
+
+COPY share-task-runner-entrypoint.sh /usr/local/bin/share-task-runner-entrypoint
+RUN chmod 555 /usr/local/bin/share-task-runner-entrypoint
+
+COPY tmp/share-task-runner /usr/local/bin/share-task-runner
+RUN chmod 555 /usr/local/bin/share-task-runner
+
+ENTRYPOINT /usr/local/bin/share-task-runner-entrypoint
+
+ARG SHARE_COMMIT
+ENV SHARE_COMMIT=$SHARE_COMMIT
diff --git a/share-api/src/Share/Utils/Tags.hs b/share-api/src/Share/Utils/Tags.hs
index e055b379..5d083fe0 100644
--- a/share-api/src/Share/Utils/Tags.hs
+++ b/share-api/src/Share/Utils/Tags.hs
@@ -8,6 +8,7 @@ module Share.Utils.Tags
 where
 
 import Control.Monad.Trans.Maybe (mapMaybeT)
+import Control.Monad.Writer.CPS
 import Share.Prelude
 
 type Tags = Map Text Text
@@ -35,6 +36,10 @@ instance (MonadTags m) => MonadTags (ReaderT e m) where
   askTags = lift askTags
   withTags newTags = mapReaderT (withTags newTags)
 
+instance (Monoid w, MonadTags m) => MonadTags (WriterT w m) where
+  askTags = lift askTags
+  withTags newTags = mapWriterT (withTags newTags)
+
 instance (MonadTags m) => MonadTags (MaybeT m) where
   askTags = lift askTags
   withTags newTags = mapMaybeT (withTags newTags)
diff --git a/share-task-runner/app/Main.hs b/share-task-runner/app/Main.hs
index d664a641..8fda6eeb 100644
--- a/share-task-runner/app/Main.hs
+++ b/share-task-runner/app/Main.hs
@@ -1,14 +1,9 @@
 module Main where
 
-import Share.Env (withEnv)
 import Share.BackgroundJobs.Monad
-import UnliftIO
+import Share.Env (withEnv)
+import Share.Tasks.AmbiguousComponentCheck qualified as AmbiguousComponentCheck
 
 main :: IO ()
 main = do
-  withEnv \env -> runBackground env "share-task-runner" task
-
-task :: Background ()
-task = do
-  liftIO $ putStrLn "Hello from the task runner!"
-  pure ()
+  withEnv \env -> runBackground env "share-task-runner" AmbiguousComponentCheck.run
diff --git a/share-task-runner/package.yaml b/share-task-runner/package.yaml
index 73ea5987..8e2b9d71 100644
--- a/share-task-runner/package.yaml
+++ b/share-task-runner/package.yaml
@@ -36,6 +36,12 @@ dependencies:
 - base >= 4.7 && < 5
 - share-api
 - unliftio
+- unison-share-api
+- unison-codebase-sqlite
+- unison-hash
+- serialise
+- transformers
+- cborg
 
 default-extensions:
   - ApplicativeDo
diff --git a/share-task-runner/share-task-runner.cabal b/share-task-runner/share-task-runner.cabal
index 22ea45f4..98d8c92e 100644
--- a/share-task-runner/share-task-runner.cabal
+++ b/share-task-runner/share-task-runner.cabal
@@ -21,6 +21,8 @@ source-repository head
   location: https://github.com/unisoncomputing/share-task-runner
 
 library
+  exposed-modules:
+      Share.Tasks.AmbiguousComponentCheck
   hs-source-dirs:
       src
   default-extensions:
@@ -57,7 +59,13 @@ library
   ghc-options: -Wall -Werror -Wname-shadowing -Wno-type-defaults -Wno-missing-pattern-synonym-signatures -Wincomplete-uni-patterns -Widentities -Wredundant-constraints -Wpartial-fields -fprint-expanded-synonyms -fwrite-ide-info -O2 -funbox-strict-fields
   build-depends:
       base >=4.7 && <5
+    , cborg
+    , serialise
     , share-api
+    , transformers
+    , unison-codebase-sqlite
+    , unison-hash
+    , unison-share-api
     , unliftio
   default-language: Haskell2010
 
@@ -99,7 +107,13 @@ executable share-task-runner
   ghc-options: -Wall -Werror -Wname-shadowing -Wno-type-defaults -Wno-missing-pattern-synonym-signatures -Wincomplete-uni-patterns -Widentities -Wredundant-constraints -Wpartial-fields -fprint-expanded-synonyms -fwrite-ide-info -O2 -funbox-strict-fields -threaded -rtsopts "-with-rtsopts=-N -A32m -qn2 -T"
   build-depends:
       base >=4.7 && <5
+    , cborg
+    , serialise
     , share-api
     , share-task-runner
+    , transformers
+    , unison-codebase-sqlite
+    , unison-hash
+    , unison-share-api
     , unliftio
   default-language: Haskell2010
diff --git a/share-task-runner/src/Share/Tasks/AmbiguousComponentCheck.hs b/share-task-runner/src/Share/Tasks/AmbiguousComponentCheck.hs
new file mode 100644
index 00000000..3213293f
--- /dev/null
+++ b/share-task-runner/src/Share/Tasks/AmbiguousComponentCheck.hs
@@ -0,0 +1,80 @@
+module Share.Tasks.AmbiguousComponentCheck (run) where
+
+import Codec.Serialise qualified as CBOR
+import Share.BackgroundJobs.Errors (reportError)
+import Share.BackgroundJobs.Monad
+import Share.Postgres qualified as PG
+import Share.Postgres.Cursors qualified as PG
+import Share.Prelude
+import Share.Utils.Logging (Loggable (..))
+import Share.Utils.Logging qualified as Logging
+import U.Codebase.Sqlite.TempEntity
+import Unison.Hash32
+import Unison.Sync.EntityValidation qualified as EV
+import Unison.Sync.Types qualified as Sync
+import Unison.Util.Servant.CBOR
+import Unison.Util.Servant.CBOR qualified as CBOR
+
+data AmbiguousComponentCheckError
+  = TaskAmbiguousComponentCheckError Hash32
+  | TaskEntityValidationError Hash32 Sync.EntityValidationError
+  | TaskEntityDecodingError Hash32 CBOR.DeserialiseFailure
+  deriving (Show, Eq)
+
+instance Loggable AmbiguousComponentCheckError where
+  toLog = \case
+    TaskAmbiguousComponentCheckError hash32 ->
+      Logging.textLog ("Ambiguous component found for hash: " <> into @Text hash32)
+        & Logging.withSeverity Logging.Error
+    TaskEntityValidationError hash32 validationError ->
+      Logging.textLog
+        ( "Entity validation error for hash: "
+            <> into @Text hash32
+            <> ", error: "
+            <> into @Text (show validationError)
+        )
+        & Logging.withSeverity Logging.Error
+    TaskEntityDecodingError hash32 decodeError ->
+      Logging.textLog
+        ( "Entity decoding error for hash: "
+            <> into @Text hash32
+            <> ", error: "
+            <> into @Text (show decodeError)
+        )
+        & Logging.withSeverity Logging.Error
+
+run :: Background ()
+run = withWorkerName "ambiguous-component-task" do
+  Logging.logInfoText "Starting ambiguous component check task."
+  errs <- PG.runTransaction $ do
+    cursor <-
+      PG.newRowCursor @(CBORBytes TempEntity, Hash32)
+        "component_cursor"
+        [PG.sql|
+      (SELECT DISTINCT ON (t.component_hash_id) bytes.bytes, ch.base32
+        FROM terms t
+          JOIN serialized_components sc ON t.component_hash_id = sc.component_hash_id
+          JOIN bytes ON sc.bytes_id = bytes.id
+          JOIN component_hashes ch ON t.component_hash_id = ch.id
+      )
+      |]
+    PG.foldBatched cursor 100 \rows -> do
+      rows
+        & foldMap
+          ( \(bytes, hash32) -> do
+              case unpackEntity bytes of
+                Left err -> [TaskEntityDecodingError hash32 err]
+                Right entity -> do
+                  case EV.validateTempEntity hash32 entity of
+                    Nothing -> []
+                    Just validationError -> [TaskEntityValidationError hash32 validationError]
+          )
+        & pure
+  for_ errs reportError
+  Logging.logInfoText "Finished ambiguous component check task."
+
+unpackEntity :: (CBORBytes TempEntity) -> Either CBOR.DeserialiseFailure TempEntity
+unpackEntity entityBytes = do
+  case CBOR.deserialiseOrFailCBORBytes entityBytes of
+    Left err -> Left err
+    Right entity -> Right entity