diff --git a/scripts/test-projects.test-support.mjs b/scripts/test-projects.test-support.mjs
index 8854cf3b908..55e51cfc4ee 100644
--- a/scripts/test-projects.test-support.mjs
+++ b/scripts/test-projects.test-support.mjs
@@ -364,6 +364,14 @@ const SOURCE_TEST_TARGETS = new Map([
     "src/secrets/provider-env-vars.ts",
     ["src/secrets/provider-env-vars.dynamic.test.ts", "src/secrets/provider-env-vars.test.ts"],
   ],
+  [
+    "src/agents/model-fallback-observation.ts",
+    ["src/agents/model-fallback.test.ts", "src/agents/model-fallback.probe.test.ts"],
+  ],
+  [
+    "src/config/sessions/transcript-append.ts",
+    ["src/config/sessions/transcript.test.ts", "src/agents/subagent-registry.persistence.test.ts"],
+  ],
   [
     "src/memory-host-sdk/host/embedding-defaults.ts",
     ["packages/memory-host-sdk/src/host/embeddings.test.ts"],
diff --git a/test/scripts/test-projects.test.ts b/test/scripts/test-projects.test.ts
index e156f6c2279..102ba05d1f0 100644
--- a/test/scripts/test-projects.test.ts
+++ b/test/scripts/test-projects.test.ts
@@ -213,6 +213,23 @@ describe("scripts/test-projects changed-target routing", () => {
     });
   });
 
+  it("routes model fallback observation changes through fallback regressions", () => {
+    expect(resolveChangedTestTargetPlan(["src/agents/model-fallback-observation.ts"])).toEqual({
+      mode: "targets",
+      targets: ["src/agents/model-fallback.test.ts", "src/agents/model-fallback.probe.test.ts"],
+    });
+  });
+
+  it("routes transcript append changes through transcript and persistence regressions", () => {
+    expect(resolveChangedTestTargetPlan(["src/config/sessions/transcript-append.ts"])).toEqual({
+      mode: "targets",
+      targets: [
+        "src/config/sessions/transcript.test.ts",
+        "src/agents/subagent-registry.persistence.test.ts",
+      ],
+    });
+  });
+
   it("keeps extension batch runner edits on extension script tests", () => {
     expect(resolveChangedTestTargetPlan(["scripts/test-extension-batch.mjs"])).toEqual({
       mode: "targets",