diff --git a/packages/@aws-cdk/core/lib/annotations.ts b/packages/@aws-cdk/core/lib/annotations.ts
index 1a6f900f4799a..4907f0b7987b0 100644
--- a/packages/@aws-cdk/core/lib/annotations.ts
+++ b/packages/@aws-cdk/core/lib/annotations.ts
@@ -1,8 +1,6 @@
 import * as cxschema from '@aws-cdk/cloud-assembly-schema';
 import * as cxapi from '@aws-cdk/cx-api';
-import { IConstruct, Node } from 'constructs';
-
-const DEPRECATIONS_SYMBOL = Symbol.for('@aws-cdk/core.deprecations');
+import { IConstruct } from 'constructs';
 
 /**
  * Includes API for attaching annotations such as warning messages to constructs.
@@ -77,38 +75,23 @@ export class Annotations {
 
     // throw if CDK_BLOCK_DEPRECATIONS is set
     if (process.env.CDK_BLOCK_DEPRECATIONS) {
-      throw new Error(`${Node.of(this.scope).path}: ${text}`);
-    }
-
-    // de-dup based on api key
-    const set = this.deprecationsReported;
-    if (set.has(api)) {
-      return;
+      throw new Error(`${this.scope.node.path}: ${text}`);
     }
 
     this.addWarning(text);
-    set.add(api);
   }
 
   /**
    * Adds a message metadata entry to the construct node, to be displayed by the CDK CLI.
+   *
+   * Records the message once per construct.
    * @param level The message level
    * @param message The message itself
    */
   private addMessage(level: string, message: string) {
-    Node.of(this.scope).addMetadata(level, message, { stackTrace: this.stackTraces });
-  }
-
-  /**
-   * Returns the set of deprecations reported on this construct.
-   */
-  private get deprecationsReported() {
-    let set = (this.scope as any)[DEPRECATIONS_SYMBOL];
-    if (!set) {
-      set = new Set();
-      Object.defineProperty(this.scope, DEPRECATIONS_SYMBOL, { value: set });
+    const isNew = !this.scope.node.metadata.find((x) => x.data === message);
+    if (isNew) {
+      this.scope.node.addMetadata(level, message, { stackTrace: this.stackTraces });
     }
-
-    return set;
   }
 }
diff --git a/packages/@aws-cdk/core/test/annotations.test.ts b/packages/@aws-cdk/core/test/annotations.test.ts
index 2f8fd0eef12a1..fc5c7430d22a8 100644
--- a/packages/@aws-cdk/core/test/annotations.test.ts
+++ b/packages/@aws-cdk/core/test/annotations.test.ts
@@ -1,7 +1,7 @@
 import { Construct } from 'constructs';
+import { getWarnings } from './util';
 import { App, Stack } from '../lib';
 import { Annotations } from '../lib/annotations';
-import { getWarnings } from './util';
 
 const restore = process.env.CDK_BLOCK_DEPRECATIONS;
 
@@ -74,4 +74,23 @@ describe('annotations', () => {
     process.env.CDK_BLOCK_DEPRECATIONS = '1';
     expect(() => Annotations.of(c1).addDeprecation('foo', 'bar')).toThrow(/MyStack\/Hello: The API foo is deprecated: bar\. This API will be removed in the next major release/);
   });
+
+  test('addMessage deduplicates the message on the node level', () => {
+    const app = new App();
+    const stack = new Stack(app, 'S1');
+    const c1 = new Construct(stack, 'C1');
+    Annotations.of(c1).addWarning('You should know this!');
+    Annotations.of(c1).addWarning('You should know this!');
+    Annotations.of(c1).addWarning('You should know this!');
+    Annotations.of(c1).addWarning('You should know this, too!');
+    expect(getWarnings(app.synth())).toEqual([{
+      path: '/S1/C1',
+      message: 'You should know this!',
+    },
+    {
+      path: '/S1/C1',
+      message: 'You should know this, too!',
+    }],
+    );
+  });
 });
diff --git a/packages/@aws-cdk/pipelines/lib/codepipeline/codepipeline.ts b/packages/@aws-cdk/pipelines/lib/codepipeline/codepipeline.ts
index ef94a85989f73..0f6997e392b18 100644
--- a/packages/@aws-cdk/pipelines/lib/codepipeline/codepipeline.ts
+++ b/packages/@aws-cdk/pipelines/lib/codepipeline/codepipeline.ts
@@ -320,6 +320,7 @@ export class CodePipeline extends PipelineBase {
   private _pipeline?: cp.Pipeline;
   private artifacts = new ArtifactMap();
   private _synthProject?: cb.IProject;
+  private _selfMutationProject?: cb.IProject;
   private readonly selfMutation: boolean;
   private readonly useChangeSets: boolean;
   private _myCxAsmRoot?: string;
@@ -365,6 +366,22 @@ export class CodePipeline extends PipelineBase {
     return this._synthProject;
   }
 
+  /**
+   * The CodeBuild project that performs the SelfMutation
+   *
+   * Will throw an error if this is accessed before `buildPipeline()`
+   * is called.
+   *
+   * May return no value if `selfMutation` was set to `false` when
+   * the `CodePipeline` was defined.
+   */
+  public get selfMutationProject(): cb.IProject | undefined {
+    if (!this._pipeline) {
+      throw new Error('Call pipeline.buildPipeline() before reading this property');
+    }
+    return this._selfMutationProject;
+  }
+
   /**
    * The CodePipeline pipeline that deploys the CDK app
    *
@@ -527,6 +544,9 @@ export class CodePipeline extends PipelineBase {
       if (nodeType === CodeBuildProjectType.SYNTH) {
         this._synthProject = result.project;
       }
+      if (nodeType === CodeBuildProjectType.SELF_MUTATE) {
+        this._selfMutationProject = result.project;
+      }
     }
 
     if (node.data?.type === 'step' && node.data.step.primaryOutput?.primaryOutput && !this._fallbackArtifact) {
diff --git a/packages/@aws-cdk/pipelines/test/codepipeline/codepipeline.test.ts b/packages/@aws-cdk/pipelines/test/codepipeline/codepipeline.test.ts
index eb1fe053ef201..a0ea38fe6f264 100644
--- a/packages/@aws-cdk/pipelines/test/codepipeline/codepipeline.test.ts
+++ b/packages/@aws-cdk/pipelines/test/codepipeline/codepipeline.test.ts
@@ -8,7 +8,7 @@ import { Stack } from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import * as cdkp from '../../lib';
 import { CodePipeline } from '../../lib';
-import { PIPELINE_ENV, TestApp, ModernTestGitHubNpmPipeline, FileAssetApp, TwoStackApp } from '../testhelpers';
+import { PIPELINE_ENV, TestApp, ModernTestGitHubNpmPipeline, FileAssetApp, TwoStackApp, StageWithStackOutput } from '../testhelpers';
 
 let app: TestApp;
 
@@ -426,6 +426,34 @@ test('synths with change set approvers', () => {
   });
 });
 
+test('selfMutationProject can be accessed after buildPipeline', () => {
+  // GIVEN
+  const pipelineStack = new cdk.Stack(app, 'PipelineStack', { env: PIPELINE_ENV });
+  const pipeline = new ModernTestGitHubNpmPipeline(pipelineStack, 'Cdk');
+  pipeline.addStage(new StageWithStackOutput(pipelineStack, 'Stage'));
+
+  // WHEN
+  pipeline.buildPipeline();
+
+  // THEN
+  expect(pipeline.selfMutationProject).toBeTruthy();
+});
+
+test('selfMutationProject is undefined if switched off', () => {
+  // GIVEN
+  const pipelineStack = new cdk.Stack(app, 'PipelineStack', { env: PIPELINE_ENV });
+  const pipeline = new ModernTestGitHubNpmPipeline(pipelineStack, 'Cdk', {
+    selfMutation: false,
+  });
+  pipeline.addStage(new StageWithStackOutput(pipelineStack, 'Stage'));
+
+  // WHEN
+  pipeline.buildPipeline();
+
+  // THEN
+  expect(pipeline.selfMutationProject).toBeUndefined();
+});
+
 interface ReuseCodePipelineStackProps extends cdk.StackProps {
   reuseCrossRegionSupportStacks?: boolean;
 }