diff --git a/eslint-factory/eslint.config.cjs b/eslint-factory/eslint.config.cjs
index dbc9db60ce9..37bb5436a62 100644
--- a/eslint-factory/eslint.config.cjs
+++ b/eslint-factory/eslint.config.cjs
@@ -25,6 +25,7 @@ module.exports = [
       "gh-aw-custom/require-fs-sync-try-catch": "warn",
       "gh-aw-custom/require-json-parse-try-catch": "warn",
       "gh-aw-custom/require-parseInt-radix": "warn",
+      "gh-aw-custom/require-return-after-core-setfailed": "warn",
     },
   },
   {
diff --git a/eslint-factory/src/index.ts b/eslint-factory/src/index.ts
index 3f1c1405733..1159fcd2268 100644
--- a/eslint-factory/src/index.ts
+++ b/eslint-factory/src/index.ts
@@ -11,6 +11,7 @@ import { requireFsSyncTryCatchRule } from "./rules/require-fs-sync-try-catch";
 import { requireJsonParseTryCatchRule } from "./rules/require-json-parse-try-catch";
 import { requireErrorCauseInRethrowRule } from "./rules/require-error-cause-in-rethrow";
 import { requireParseIntRadixRule } from "./rules/require-parseInt-radix";
+import { requireReturnAfterCoreSetFailedRule } from "./rules/require-return-after-core-setfailed";
 
 const plugin = {
   meta: {
@@ -31,6 +32,7 @@ const plugin = {
     "require-fs-sync-try-catch": requireFsSyncTryCatchRule,
     "require-json-parse-try-catch": requireJsonParseTryCatchRule,
     "require-parseInt-radix": requireParseIntRadixRule,
+    "require-return-after-core-setfailed": requireReturnAfterCoreSetFailedRule,
   },
 };
 
diff --git a/eslint-factory/src/rules/require-return-after-core-setfailed.test.ts b/eslint-factory/src/rules/require-return-after-core-setfailed.test.ts
new file mode 100644
index 00000000000..9b7a6a22a20
--- /dev/null
+++ b/eslint-factory/src/rules/require-return-after-core-setfailed.test.ts
@@ -0,0 +1,101 @@
+import { RuleTester } from "eslint";
+import { describe, expect, it } from "vitest";
+import { requireReturnAfterCoreSetFailedRule } from "./require-return-after-core-setfailed";
+
+const ruleTester = new RuleTester({
+  languageOptions: {
+    ecmaVersion: 2022,
+    sourceType: "commonjs",
+  },
+});
+
+describe("require-return-after-core-setfailed", () => {
+  it("uses the correct docs URL", () => {
+    expect(requireReturnAfterCoreSetFailedRule.meta.docs.url).toBe("https://github.com/github/gh-aw/tree/main/eslint-factory#require-return-after-core-setfailed");
+  });
+
+  it("valid: core.setFailed followed by return", () => {
+    ruleTester.run("require-return-after-core-setfailed", requireReturnAfterCoreSetFailedRule, {
+      valid: [
+        `function f() { core.setFailed("bad"); return; }`,
+        `function f() { core.setFailed("bad"); return null; }`,
+        `function f() { if (x) { core.setFailed("bad"); return; } }`,
+        `function f() { core.setFailed("bad"); throw new Error("bad"); }`,
+        `function f() { core.setFailed("bad"); process.exit(1); }`,
+        `function f() { for (;;) { core.setFailed("bad"); break; } }`,
+        `switch (x) { case "a": core.setFailed("bad"); break; }`,
+        // setFailed is the last statement in the block — no next statement to check
+        `function f() { core.setFailed("bad"); }`,
+        `function f() { if (x) { core.setFailed("bad"); } }`,
+      ],
+      invalid: [],
+    });
+  });
+
+  it("valid: non-core.setFailed calls are ignored", () => {
+    ruleTester.run("require-return-after-core-setfailed", requireReturnAfterCoreSetFailedRule, {
+      valid: [`function f() { other.setFailed("bad"); doMore(); }`, `function f() { core.setOutput("x", 1); doMore(); }`, `function f() { setFailed("bad"); doMore(); }`],
+      invalid: [],
+    });
+  });
+
+  it("invalid: core.setFailed followed by non-control-transfer statement", () => {
+    ruleTester.run("require-return-after-core-setfailed", requireReturnAfterCoreSetFailedRule, {
+      valid: [],
+      invalid: [
+        {
+          code: `function f() { core.setFailed("bad"); doMore(); }`,
+          errors: [{ messageId: "missingReturnAfterSetFailed", suggestions: [{ messageId: "addReturn", output: `function f() { core.setFailed("bad"); return; doMore(); }` }] }],
+        },
+        {
+          code: `function f() { if (x) { core.setFailed("bad"); doMore(); } }`,
+          errors: [{ messageId: "missingReturnAfterSetFailed", suggestions: [{ messageId: "addReturn", output: `function f() { if (x) { core.setFailed("bad"); return; doMore(); } }` }] }],
+        },
+        {
+          code: `function f() {
+  if (x) {
+    core.setFailed("bad"); // keep with setFailed
+    doMore();
+  }
+}`,
+          errors: [
+            {
+              messageId: "missingReturnAfterSetFailed",
+              suggestions: [
+                {
+                  messageId: "addReturn",
+                  output: `function f() {
+  if (x) {
+    core.setFailed("bad"); // keep with setFailed
+    return;
+    doMore();
+  }
+}`,
+                },
+              ],
+            },
+          ],
+        },
+        {
+          code: `switch (x) { case "a": core.setFailed("bad"); doMore(); break; }`,
+          errors: [{ messageId: "missingReturnAfterSetFailed" }],
+        },
+        {
+          code: `core.setFailed("bad");
+doMore();`,
+          errors: [{ messageId: "missingReturnAfterSetFailed", suggestions: undefined }],
+        },
+      ],
+    });
+  });
+
+  it("valid: core.setFailed last in if-block is not flagged (outer block continues)", () => {
+    ruleTester.run("require-return-after-core-setfailed", requireReturnAfterCoreSetFailedRule, {
+      valid: [
+        // setFailed is the last statement in the if-block; no sibling in the same block follows it
+        `function f() { if (!ok) { core.setFailed("msg"); } doMore(); }`,
+      ],
+      invalid: [],
+    });
+  });
+});
diff --git a/eslint-factory/src/rules/require-return-after-core-setfailed.ts b/eslint-factory/src/rules/require-return-after-core-setfailed.ts
new file mode 100644
index 00000000000..89a8bd91568
--- /dev/null
+++ b/eslint-factory/src/rules/require-return-after-core-setfailed.ts
@@ -0,0 +1,141 @@
+import { AST_NODE_TYPES, ESLintUtils, TSESTree } from "@typescript-eslint/utils";
+
+const createRule = ESLintUtils.RuleCreator(name => `https://github.com/github/gh-aw/tree/main/eslint-factory#${name}`);
+
+/**
+ * Returns true when the statement is a call to `core.setFailed(...)`.
+ */
+function isCoreSetFailedStatement(node: TSESTree.Statement): node is TSESTree.ExpressionStatement {
+  if (node.type !== AST_NODE_TYPES.ExpressionStatement) return false;
+  const expr = node.expression;
+  if (expr.type !== AST_NODE_TYPES.CallExpression) return false;
+  const callee = expr.callee;
+  if (callee.type !== AST_NODE_TYPES.MemberExpression || callee.computed) return false;
+  const obj = callee.object;
+  const prop = callee.property;
+  return obj.type === AST_NODE_TYPES.Identifier && obj.name === "core" && prop.type === AST_NODE_TYPES.Identifier && prop.name === "setFailed";
+}
+
+/**
+ * Returns true when the statement unconditionally transfers control out of the
+ * current block: `return`, `throw`, `break`, `continue`, or `process.exit(...)`.
+ */
+function isControlTransfer(node: TSESTree.Statement): boolean {
+  const matchesControlTransferType = node.type === AST_NODE_TYPES.ReturnStatement || node.type === AST_NODE_TYPES.ThrowStatement || node.type === AST_NODE_TYPES.BreakStatement || node.type === AST_NODE_TYPES.ContinueStatement;
+  if (matchesControlTransferType) {
+    return true;
+  }
+  // process.exit(...)
+  if (node.type === AST_NODE_TYPES.ExpressionStatement && node.expression.type === AST_NODE_TYPES.CallExpression) {
+    const callee = node.expression.callee;
+    if (
+      callee.type === AST_NODE_TYPES.MemberExpression &&
+      !callee.computed &&
+      callee.object.type === AST_NODE_TYPES.Identifier &&
+      callee.object.name === "process" &&
+      callee.property.type === AST_NODE_TYPES.Identifier &&
+      callee.property.name === "exit"
+    ) {
+      return true;
+    }
+  }
+  return false;
+}
+
+/**
+ * Checks a list of sequential statements for `core.setFailed(...)` calls that
+ * are not immediately followed by a control-transfer statement.
+ */
+function checkStatementList(stmts: TSESTree.Statement[], report: (node: TSESTree.Statement, next: TSESTree.Statement) => void): void {
+  for (let i = 0; i < stmts.length; i++) {
+    const stmt = stmts[i];
+    if (!isCoreSetFailedStatement(stmt)) continue;
+    const next = stmts[i + 1];
+    if (next && !isControlTransfer(next)) {
+      report(stmt, next);
+    }
+  }
+}
+
+function isExecutableStatement(node: TSESTree.ProgramStatement): node is TSESTree.Statement {
+  return (
+    node.type !== AST_NODE_TYPES.ImportDeclaration &&
+    node.type !== AST_NODE_TYPES.ExportAllDeclaration &&
+    node.type !== AST_NODE_TYPES.ExportDefaultDeclaration &&
+    node.type !== AST_NODE_TYPES.ExportNamedDeclaration &&
+    node.type !== AST_NODE_TYPES.TSModuleDeclaration
+  );
+}
+
+export const requireReturnAfterCoreSetFailedRule = createRule({
+  name: "require-return-after-core-setfailed",
+  meta: {
+    type: "problem",
+    hasSuggestions: true,
+    docs: {
+      description:
+        "Require a return, throw, break, continue, or process.exit() statement immediately after core.setFailed() to prevent execution from continuing after a failure is declared. " +
+        "core.setFailed() only marks the action as failed at the end; it does not stop execution.",
+    },
+    schema: [],
+    messages: {
+      missingReturnAfterSetFailed:
+        "core.setFailed() does not stop execution — add a control-transfer statement (for example: return, throw, break, continue, or process.exit(...)) immediately after to prevent the action from continuing in a failed state.",
+      addReturn: "Add 'return;' after core.setFailed() to stop execution.",
+    },
+  },
+  defaultOptions: [],
+  create(context) {
+    const sourceCode = context.sourceCode;
+
+    function isInsideFunctionLike(node: TSESTree.Node): boolean {
+      const ancestors = sourceCode.getAncestors(node);
+      for (let i = ancestors.length - 1; i >= 0; i--) {
+        const ancestor = ancestors[i];
+        const isFunctionLike = ancestor.type === AST_NODE_TYPES.FunctionDeclaration || ancestor.type === AST_NODE_TYPES.FunctionExpression || ancestor.type === AST_NODE_TYPES.ArrowFunctionExpression;
+        if (isFunctionLike) {
+          return true;
+        }
+      }
+      return false;
+    }
+
+    function report(node: TSESTree.Statement, next: TSESTree.Statement): void {
+      context.report({
+        node,
+        messageId: "missingReturnAfterSetFailed",
+        suggest: isInsideFunctionLike(node)
+          ? [
+              {
+                messageId: "addReturn",
+                fix(fixer) {
+                  const isOnSameLine = next.loc.start.line === node.loc.end.line;
+                  if (isOnSameLine) {
+                    return fixer.insertTextBefore(next, "return; ");
+                  }
+                  const line = sourceCode.lines[next.loc.start.line - 1] ?? "";
+                  const indent = /^(\s*)/.exec(line)?.[1] ?? "";
+                  return fixer.insertTextBefore(next, `return;\n${indent}`);
+                },
+              },
+            ]
+          : undefined,
+      });
+    }
+
+    return {
+      // Check statement blocks: if body, else body, while body, function body, etc.
+      BlockStatement(node: TSESTree.BlockStatement) {
+        checkStatementList(node.body, report);
+      },
+      // Handle single-statement arrow functions (no braces) — rare but safe to skip
+      // The main case is BlockStatement above.
+      SwitchCase(node: TSESTree.SwitchCase) {
+        checkStatementList(node.consequent, report);
+      },
+      Program(node: TSESTree.Program) {
+        checkStatementList(node.body.filter(isExecutableStatement), report);
+      },
+    };
+  },
+});