diff --git a/.github/workflows/chatops.yml b/.github/workflows/chatops.yml
index ff8d3513..a107a407 100644
--- a/.github/workflows/chatops.yml
+++ b/.github/workflows/chatops.yml
@@ -5,17 +5,29 @@ on:
     types:               [created]
 
 jobs:
-  chatops:
-    name:                ChatOps
+  workflows:
+    name:                ChatOps (Workflows)
     runs-on:             ubuntu-latest
+    if:                  ${{ github.event.pull_request }}
 
     steps:
       # launch workflows with specific instructions.
-      - name:            ChatOps
+      - name:            ChatOps (Repository)
         uses:            peter-evans/slash-command-dispatch@v2
         with:
           token:         ${{ secrets.CHATOPS_PAT }}
-          dispatch_type: workflow
           commands:      |
-            merge
             test
+          static-args:   |
+            repo=${{ github.pull_request.head.repo.full_name }}
+            head=${{ github.pull_request.head.sha }}
+            base=${{ github.pull_request.base.sha }}
+          dispatch-type: workflow
+      # append error message.
+      - name:            Edit comment with error message
+        if:              steps.scd.outputs.error-message
+        uses:            peter-evans/create-or-update-comment@v1
+        with:
+          comment-id:    ${{ github.event.comment.id }}
+          body:          |
+            > ${{ steps.scd.outputs.error-message }}
diff --git a/.github/workflows/merge.yml b/.github/workflows/merge.yml
deleted file mode 100644
index 22dbd76a..00000000
--- a/.github/workflows/merge.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-name:                  merge
-
-on:
-  repository_dispatch:
-    types:
-      - merge-command
-
-jobs:
-  test:
-    name:              Merge
-    runs-on:           ubuntu-latest
-
-    steps:
-    # checkout the current PR of `ComposableRequest`.
-    - name:            Checkout
-      uses:            actions/checkout@v2
-      with:
-          token:       ${{ secrets.GITHUB_TOKEN }}
-          repository:  ${{ github.event.client_payload.pull_request.head.repo.full_name }}
-          ref:         ${{ github.event.client_payload.pull_request.head.sha }}
-    # config author.
-    - name:            Config
-      id:              config
-      run:             |
-        git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-        git config user.name "github-actions"
-    # rebase `base` into `head`.
-    - name:            Rebase
-      run:             |
-        git checkout -b test
-        git rebase ${{ github.event.client_payload.pull_request.base.sha }}
-    # merge `head` into `base`.
-    - name:            Merge
-      run:             |
-        git checkout -b ${{ github.event.client_payload.pull_request.base.ref }} origin/${{ github.event.client_payload.pull_request.base.ref }}
-        git merge test -m "chore(merge): merge #${{ github.event.client_payload.pull_request.number }} into \`${{ github.event.client_payload.pull_request.base.ref }}\`" --no-ff
-        git push origin ${{ github.event.client_payload.pull_request.base.ref }} --force-with-lease
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index 7e4d0fc7..7b6f57eb 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -38,8 +38,8 @@ jobs:
       - uses:           dorny/paths-filter@v2
         id:             changes
         with:
-          base:         ${{ github.event.pull_request.base.sha ?? github.event.push.before }}
-          ref:          ${{ github.event.pull_request.head.sha ?? github.event.push.head }}
+          base:         ${{ github.event.pull_request.base.sha || github.event.push.before }}
+          ref:          ${{ github.event.pull_request.head.sha || github.event.push.head }}
           filters:      |
             src:
               - '**/*.swift'
@@ -61,8 +61,8 @@ jobs:
       - uses:           dorny/paths-filter@v2
         id:             changes
         with:
-          base:         ${{ github.event.pull_request.base.sha ?? github.event.push.before }}
-          ref:          ${{ github.event.pull_request.head.sha ?? github.event.push.head }}
+          base:         ${{ github.event.pull_request.base.sha || github.event.push.before }}
+          ref:          ${{ github.event.pull_request.head.sha || github.event.push.head }}
           filters:      |
             src:
               - '**/*.swift'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5324e895..1cecc97f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -2,13 +2,13 @@ name:                        merge
 
 on:
   push:
-    barnches:
+    branches:
       - main
 
 jobs:
   # rebase `bugfixes` and `development` on merged PRs.
   rebase:
-    name:                    rebase
+    name:                    Rebase
     runs-on:                 ubuntu-latest
     if:                      ${{ github.event.pull_request.merged == true }}
 
@@ -43,7 +43,7 @@ jobs:
 
   # release a new version.
   release:
-    name:                    release
+    name:                    Release
     runs-on:                 ubuntu-latest
     if:                      ${{ github.event.pull_request.merged == true }}
 
@@ -95,7 +95,7 @@ jobs:
 
   # create docs.
   docs:
-    name:                    docs
+    name:                    Docs
     needs:                   release
     runs-on:                 ubuntu-latest
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test-command.yml
similarity index 64%
rename from .github/workflows/test.yml
rename to .github/workflows/test-command.yml
index 97ede1f0..4f63aa9a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test-command.yml
@@ -1,9 +1,17 @@
 name:                  test
 
 on:
-  repository_dispatch:
-    types:
-      - test-command
+  workflow_dispatch:
+    inputs:
+      repo:
+        description: ''
+        required: true
+      head:
+        description: ''
+        required: true
+      base:
+        description: ''
+        required: true
 
 jobs:
   test:
@@ -16,14 +24,14 @@ jobs:
       uses:            actions/checkout@v2
       with:
           token:       ${{ secrets.GITHUB_TOKEN }}
-          repository:  ${{ github.event.client_payload.pull_request.head.repo.full_name }}
-          ref:         ${{ github.event.client_payload.pull_request.head.sha }}
+          repository:  ${{ github.event.inputs.repo }}
+          ref:         ${{ github.event.inputs.head }}
     # filter updates.
     - uses:            dorny/paths-filter@v2
       id:              changes
       with:
-        base:          ${{ github.event.client_payload.pull_request.base.sha }}
-        ref:           ${{ github.event.client_payload.pull_request.head.sha }}
+        base:          ${{ github.event.inputs.base }}
+        ref:           ${{ github.event.inputs.head }}
         filters:       |
           src:
             - '**/*.swift'