diff --git a/CHANGELOG.md b/CHANGELOG.md
index fab75b6..c25bd98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- BREAKING CHANGE: Add `testRunStartedId` to `TestPlanIngredients` ([#3](https://github.com/cucumber/javascript-core/pull/3))
 
 ## [0.1.0] - 2025-07-24
 ### Added
diff --git a/cucumber-core.api.md b/cucumber-core.api.md
index fa0f08b..1f477b2 100644
--- a/cucumber-core.api.md
+++ b/cucumber-core.api.md
@@ -170,6 +170,7 @@ export interface TestPlanIngredients {
     gherkinDocument: GherkinDocument;
     pickles: ReadonlyArray<Pickle>;
     supportCodeLibrary: SupportCodeLibrary;
+    testRunStartedId: string;
 }
 
 // @public
diff --git a/src/makeTestPlan.spec.ts b/src/makeTestPlan.spec.ts
index 83e3085..62e8cd7 100644
--- a/src/makeTestPlan.spec.ts
+++ b/src/makeTestPlan.spec.ts
@@ -37,7 +37,7 @@ function parseGherkin(
 
 describe('makeTestPlan', () => {
   class FakeWorld {}
-
+  const testRunStartedId = 'run-id'
   let newId: () => string
 
   beforeEach(() => {
@@ -51,6 +51,7 @@ describe('makeTestPlan', () => {
 
       const result = makeTestPlan(
         {
+          testRunStartedId,
           gherkinDocument,
           pickles,
           supportCodeLibrary,
@@ -69,6 +70,7 @@ describe('makeTestPlan', () => {
 
       const result = makeTestPlan(
         {
+          testRunStartedId,
           gherkinDocument,
           pickles,
           supportCodeLibrary,
@@ -86,11 +88,7 @@ describe('makeTestPlan', () => {
       const supportCodeLibrary = buildSupportCode({ newId }).build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -111,11 +109,7 @@ describe('makeTestPlan', () => {
       const supportCodeLibrary = buildSupportCode({ newId }).build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
           strategy: {
@@ -154,11 +148,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -172,11 +162,7 @@ describe('makeTestPlan', () => {
       const supportCodeLibrary = buildSupportCode({ newId }).build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -201,11 +187,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -235,11 +217,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -269,11 +247,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -308,11 +282,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -359,11 +329,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -414,11 +380,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -484,11 +446,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -528,11 +486,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -566,11 +520,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -605,11 +555,7 @@ describe('makeTestPlan', () => {
         .build()
 
       const result = makeTestPlan(
-        {
-          gherkinDocument,
-          pickles,
-          supportCodeLibrary,
-        },
+        { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary },
         {
           newId,
         }
@@ -657,6 +603,7 @@ describe('makeTestPlan', () => {
                 id: '10',
               },
             ],
+            testRunStartedId,
           },
         },
       ])
diff --git a/src/makeTestPlan.ts b/src/makeTestPlan.ts
index 6a8fc9a..7a81da2 100644
--- a/src/makeTestPlan.ts
+++ b/src/makeTestPlan.ts
@@ -34,7 +34,7 @@ export function makeTestPlan(
   ingredients: TestPlanIngredients,
   options: TestPlanOptions = {}
 ): AssembledTestPlan {
-  const { gherkinDocument, pickles, supportCodeLibrary } = ingredients
+  const { testRunStartedId, gherkinDocument, pickles, supportCodeLibrary } = ingredients
   const {
     newId = IdGenerator.uuid(),
     strategy = namingStrategy(
@@ -61,6 +61,7 @@ export function makeTestPlan(
             id: this.id,
             pickleId: pickle.id,
             testSteps: this.steps.map((step) => step.toMessage()),
+            testRunStartedId,
           }
         },
       }
diff --git a/src/types.ts b/src/types.ts
index 12e983f..977a35d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -295,6 +295,10 @@ export type MatchedStep = {
  * @public
  */
 export interface TestPlanIngredients {
+  /**
+   * Identifier for the test run within which this plan will be executed
+   */
+  testRunStartedId: string
   /**
    * The Gherkin document that has been processed
    */