diff --git a/actions/ql/lib/change-notes/2025-06-04-diff-informed.md b/actions/ql/lib/change-notes/2025-06-04-diff-informed.md
new file mode 100644
index 000000000000..dea4253df2d7
--- /dev/null
+++ b/actions/ql/lib/change-notes/2025-06-04-diff-informed.md
@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* A number of built-in Actions queries can now run in diff-informed mode.
diff --git a/actions/ql/lib/codeql/actions/security/OutputClobberingQuery.qll b/actions/ql/lib/codeql/actions/security/OutputClobberingQuery.qll
index 1d0de83afa34..485d2762798e 100644
--- a/actions/ql/lib/codeql/actions/security/OutputClobberingQuery.qll
+++ b/actions/ql/lib/codeql/actions/security/OutputClobberingQuery.qll
@@ -214,6 +214,8 @@ private module OutputClobberingConfig implements DataFlow::ConfigSig {
       )
     )
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 /** Tracks flow of unsafe user input that is used to construct and evaluate an environment variable. */
diff --git a/actions/ql/lib/codeql/actions/security/RequestForgeryQuery.qll b/actions/ql/lib/codeql/actions/security/RequestForgeryQuery.qll
index ca0ac267131f..fb89ebdc8baf 100644
--- a/actions/ql/lib/codeql/actions/security/RequestForgeryQuery.qll
+++ b/actions/ql/lib/codeql/actions/security/RequestForgeryQuery.qll
@@ -16,6 +16,8 @@ private module RequestForgeryConfig implements DataFlow::ConfigSig {
   predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
 
   predicate isSink(DataFlow::Node sink) { sink instanceof RequestForgerySink }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 /** Tracks flow of unsafe user input that is used to construct and evaluate a system command. */
diff --git a/actions/ql/lib/codeql/actions/security/SecretExfiltrationQuery.qll b/actions/ql/lib/codeql/actions/security/SecretExfiltrationQuery.qll
index 18a480b1cecc..b3d59210053c 100644
--- a/actions/ql/lib/codeql/actions/security/SecretExfiltrationQuery.qll
+++ b/actions/ql/lib/codeql/actions/security/SecretExfiltrationQuery.qll
@@ -15,6 +15,8 @@ private module SecretExfiltrationConfig implements DataFlow::ConfigSig {
   predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
 
   predicate isSink(DataFlow::Node sink) { sink instanceof SecretExfiltrationSink }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 /** Tracks flow of unsafe user input that is used in a context where it may lead to a secret exfiltration. */
diff --git a/actions/ql/src/Models/CompositeActionsSinks.ql b/actions/ql/src/Models/CompositeActionsSinks.ql
index b5ce78fe062a..82f0754f03e2 100644
--- a/actions/ql/src/Models/CompositeActionsSinks.ql
+++ b/actions/ql/src/Models/CompositeActionsSinks.ql
@@ -24,6 +24,8 @@ private module MyConfig implements DataFlow::ConfigSig {
   predicate isSink(DataFlow::Node sink) {
     sink instanceof CodeInjectionSink and not madSink(sink, "code-injection")
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;
diff --git a/actions/ql/src/Models/CompositeActionsSources.ql b/actions/ql/src/Models/CompositeActionsSources.ql
index 8e4275f27c7d..c9974cd73614 100644
--- a/actions/ql/src/Models/CompositeActionsSources.ql
+++ b/actions/ql/src/Models/CompositeActionsSources.ql
@@ -34,6 +34,8 @@ private module MyConfig implements DataFlow::ConfigSig {
     isSink(node) and
     set instanceof DataFlow::FieldContent
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;
diff --git a/actions/ql/src/Models/CompositeActionsSummaries.ql b/actions/ql/src/Models/CompositeActionsSummaries.ql
index 8b8b5af3c459..814498f639e0 100644
--- a/actions/ql/src/Models/CompositeActionsSummaries.ql
+++ b/actions/ql/src/Models/CompositeActionsSummaries.ql
@@ -25,6 +25,8 @@ private module MyConfig implements DataFlow::ConfigSig {
   predicate isSink(DataFlow::Node sink) {
     exists(CompositeAction c | c.getAnOutputExpr() = sink.asExpr())
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;
diff --git a/actions/ql/src/Models/ReusableWorkflowsSinks.ql b/actions/ql/src/Models/ReusableWorkflowsSinks.ql
index 05334a533ddf..8d02debbdb4a 100644
--- a/actions/ql/src/Models/ReusableWorkflowsSinks.ql
+++ b/actions/ql/src/Models/ReusableWorkflowsSinks.ql
@@ -24,6 +24,8 @@ private module MyConfig implements DataFlow::ConfigSig {
   predicate isSink(DataFlow::Node sink) {
     sink instanceof CodeInjectionSink and not madSink(sink, "code-injection")
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;
diff --git a/actions/ql/src/Models/ReusableWorkflowsSources.ql b/actions/ql/src/Models/ReusableWorkflowsSources.ql
index e5612d063432..a7112bf37584 100644
--- a/actions/ql/src/Models/ReusableWorkflowsSources.ql
+++ b/actions/ql/src/Models/ReusableWorkflowsSources.ql
@@ -34,6 +34,8 @@ private module MyConfig implements DataFlow::ConfigSig {
     isSink(node) and
     set instanceof DataFlow::FieldContent
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;
diff --git a/actions/ql/src/Models/ReusableWorkflowsSummaries.ql b/actions/ql/src/Models/ReusableWorkflowsSummaries.ql
index 444ce028954e..a05bec744f84 100644
--- a/actions/ql/src/Models/ReusableWorkflowsSummaries.ql
+++ b/actions/ql/src/Models/ReusableWorkflowsSummaries.ql
@@ -25,6 +25,8 @@ private module MyConfig implements DataFlow::ConfigSig {
   predicate isSink(DataFlow::Node sink) {
     exists(ReusableWorkflow w | w.getAnOutputExpr() = sink.asExpr())
   }
+
+  predicate observeDiffInformedIncrementalMode() { any() }
 }
 
 module MyFlow = TaintTracking::Global<MyConfig>;