diff --git a/.github/workflows/push_tip_to_trybot.yaml b/.github/workflows/push_tip_to_trybot.yaml
index 6416b7008..9fa0056ad 100644
--- a/.github/workflows/push_tip_to_trybot.yaml
+++ b/.github/workflows/push_tip_to_trybot.yaml
@@ -1,12 +1,18 @@
 # Code generated internal/ci/base/write.cue; DO NOT EDIT.
 
+name: Push tip to trybot
+"on":
+  push:
+    branches:
+      - master
+      - release-branch.*
 concurrency: push_tip_to_trybot
 jobs:
   push:
     defaults:
       run:
         shell: bash --noprofile --norc -euo pipefail {0}
-    runs-on: ns-linux-amd64-small
+    runs-on: ns-linux-amd64-small;overrides.cache-tag=cue-dispatch-workflow
     if: ${{github.repository == 'cue-lang/cue'}}
     steps:
       - name: Write netrc file for cueckoo Gerrithub
@@ -43,9 +49,3 @@ jobs:
           	 echo "Giving up"
           	 exit 1
           fi
-name: Push tip to trybot
-"on":
-  push:
-    branches:
-      - master
-      - release-branch.*
diff --git a/.github/workflows/tip_triggers.yaml b/.github/workflows/tip_triggers.yaml
index 85422058c..10e084051 100644
--- a/.github/workflows/tip_triggers.yaml
+++ b/.github/workflows/tip_triggers.yaml
@@ -11,7 +11,7 @@ jobs:
     defaults:
       run:
         shell: bash --noprofile --norc -euo pipefail {0}
-    runs-on: ns-linux-amd64-small
+    runs-on: ns-linux-amd64-small;overrides.cache-tag=cue-dispatch-workflow
     if: ${{github.repository == 'cue-lang/cue'}}
     steps:
       - name: Trigger unity build
diff --git a/.github/workflows/trybot_dispatch.yaml b/.github/workflows/trybot_dispatch.yaml
index 97146f51b..f7c0c2c39 100644
--- a/.github/workflows/trybot_dispatch.yaml
+++ b/.github/workflows/trybot_dispatch.yaml
@@ -11,7 +11,7 @@ jobs:
     defaults:
       run:
         shell: bash --noprofile --norc -euo pipefail {0}
-    runs-on: ns-linux-amd64-small
+    runs-on: ns-linux-amd64-small;overrides.cache-tag=cue-dispatch-workflow
     if: ${{ ((github.ref == 'refs/heads/ci/test') && false) || github.event.client_payload.type == 'trybot' }}
     steps:
       - name: Write netrc file for cueckoo Gerrithub
diff --git a/internal/ci/base/base.cue b/internal/ci/base/base.cue
index 662308191..1cb9e02b8 100644
--- a/internal/ci/base/base.cue
+++ b/internal/ci/base/base.cue
@@ -88,6 +88,13 @@ linuxMachine: string | *linuxSmallMachine
 macosMachine:   string | *"ns-macos-arm64"
 windowsMachine: string | *"ns-windows-amd64"
 
+// Append this suffix to "runs-on" to prevent workflows from sharing the default caches
+// for the repository and runner profile. For example, this is useful so that
+// a "tip_triggers" workflow on the cue repo to push to rebuild tip.cuelang.org
+// does not share cache volumes with the main "trybot" workflow, which makes much heavier
+// use of the cache. Mixing the two would lead to less effective cache updates.
+overrideCacheTagDispatch: ";overrides.cache-tag=cue-dispatch-workflow"
+
 // Use the latest Go version for extra checks,
 // such as running tests with the data race detector.
 latestGo: "1.24.x"
diff --git a/internal/ci/base/gerrithub.cue b/internal/ci/base/gerrithub.cue
index 6cfa80bb2..2c8a32117 100644
--- a/internal/ci/base/gerrithub.cue
+++ b/internal/ci/base/gerrithub.cue
@@ -48,7 +48,7 @@ trybotDispatchWorkflow: bashWorkflow & {
 	}
 	jobs: {
 		(trybot.key): {
-			"runs-on": linuxSmallMachine
+			"runs-on": linuxSmallMachine + overrideCacheTagDispatch
 
 			let goodDummyData = [if json.Marshal(#dummyDispatch) != _|_ {true}, false][0]
 
@@ -165,16 +165,12 @@ pushTipToTrybotWorkflow: bashWorkflow & {
 	on: {
 		push: branches: protectedBranchPatterns
 	}
-	jobs: push: {
-		"runs-on": linuxSmallMachine
-		if:        "${{github.repository == '\(githubRepositoryPath)'}}"
-	}
-
 	name: "Push tip to \(trybot.key)"
-
 	concurrency: "push_tip_to_trybot"
 
 	jobs: push: {
+		"runs-on": linuxSmallMachine + overrideCacheTagDispatch
+		if:        "${{github.repository == '\(githubRepositoryPath)'}}"
 		steps: [
 			writeNetrcFile,
 			{
diff --git a/internal/ci/github/tip_triggers.cue b/internal/ci/github/tip_triggers.cue
index 0e4396ae5..b6c44224d 100644
--- a/internal/ci/github/tip_triggers.cue
+++ b/internal/ci/github/tip_triggers.cue
@@ -21,7 +21,7 @@ workflows: tip_triggers: _repo.bashWorkflow & {
 	name: "Triggers on push to tip"
 	on: push: branches: [_repo.defaultBranch, _repo.testDefaultBranch]
 	jobs: push: {
-		"runs-on": _repo.linuxSmallMachine
+		"runs-on": _repo.linuxSmallMachine + _repo.overrideCacheTagDispatch
 		if:        "${{github.repository == '\(_repo.githubRepositoryPath)'}}"
 		steps: [
 			_repo.repositoryDispatch & {