diff --git a/packages/core-eslint/rules/no-undeclared-event-publish.js b/packages/core-eslint/rules/no-undeclared-event-publish.js
new file mode 100644
index 0000000..bc44a5a
--- /dev/null
+++ b/packages/core-eslint/rules/no-undeclared-event-publish.js
@@ -0,0 +1,56 @@
+import { parseManifestUseCases } from "./_manifest-ast.js";
+import { useCaseNameFromFile } from "./_usecase-name.js";
+import { manifestPathForFeature, featureRootForFile } from "./_manifest-source.js";
+
+/** @type {import("eslint").Rule.RuleModule} */
+export default {
+  meta: {
+    type: "problem",
+    docs: {
+      description:
+        "bus.publish(\"X\") inside a use-case factory must declare X in manifest.useCases[name].publishes.",
+    },
+    schema: [
+      {
+        type: "object",
+        properties: { repoRoot: { type: "string" } },
+        additionalProperties: false,
+      },
+    ],
+    messages: {
+      undeclared:
+        "{{useCase}} calls bus.publish(\"{{event}}\") but {{event}} is not declared in manifest.useCases.{{useCase}}.publishes. Add it to the manifest or remove the call.",
+    },
+  },
+  create(context) {
+    const opts = context.options[0] ?? {};
+    const repoRoot = opts.repoRoot ?? context.cwd ?? process.cwd();
+    const filename = context.filename;
+    const useCaseName = useCaseNameFromFile(filename);
+    if (!useCaseName) return {};
+    const featureRoot = featureRootForFile(filename, repoRoot);
+    if (!featureRoot) return {};
+    const manifest = parseManifestUseCases(manifestPathForFeature(featureRoot));
+    if (!manifest || !manifest[useCaseName]) return {};
+    const declared = new Set(manifest[useCaseName].publishes);
+    return {
+      CallExpression(node) {
+        if (
+          node.callee.type === "MemberExpression" &&
+          node.callee.object.type === "Identifier" &&
+          node.callee.object.name === "bus" &&
+          node.callee.property.type === "Identifier" &&
+          node.callee.property.name === "publish" &&
+          node.arguments.length > 0 &&
+          node.arguments[0].type === "Literal" &&
+          typeof node.arguments[0].value === "string"
+        ) {
+          const event = node.arguments[0].value;
+          if (!declared.has(event)) {
+            context.report({ node, messageId: "undeclared", data: { event, useCase: useCaseName } });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/packages/core-eslint/rules/no-undeclared-event-publish.test.js b/packages/core-eslint/rules/no-undeclared-event-publish.test.js
new file mode 100644
index 0000000..5a8b880
--- /dev/null
+++ b/packages/core-eslint/rules/no-undeclared-event-publish.test.js
@@ -0,0 +1,80 @@
+import { describe, it } from "vitest";
+import { RuleTester } from "eslint";
+import path from "node:path";
+import os from "node:os";
+import fs from "node:fs";
+import rule from "./no-undeclared-event-publish.js";
+
+function makeFixture({ manifestUseCases, useCaseBody }) {
+  const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuep-"));
+  const featureDir = path.join(repoRoot, "packages", "demo");
+  fs.mkdirSync(path.join(featureDir, "src", "application", "use-cases"), { recursive: true });
+  const useCasesObj = Object.entries(manifestUseCases)
+    .map(([name, uc]) =>
+      `    ${name}: { mutates: ${uc.mutates}, audits: [${uc.audits.map((a) => `"${a}"`).join(", ")}], publishes: [${uc.publishes.map((p) => `"${p}"`).join(", ")}], consumes: [] },`,
+    )
+    .join("\n");
+  fs.writeFileSync(
+    path.join(featureDir, "src", "feature.manifest.ts"),
+    `export const demoManifest = defineFeature({
+  name: "demo",
+  requiredCores: [],
+  useCases: {
+${useCasesObj}
+  },
+  realtimeChannels: [],
+  jobs: [],
+} as const);`,
+  );
+  const useCaseFile = path.join(featureDir, "src", "application", "use-cases", "sign-up.use-case.ts");
+  fs.writeFileSync(useCaseFile, useCaseBody);
+  return { repoRoot, useCaseFile };
+}
+
+const tester = new RuleTester({
+  languageOptions: {
+    parser: await import("@typescript-eslint/parser"),
+    ecmaVersion: "latest",
+    sourceType: "module",
+  },
+});
+
+describe("no-undeclared-event-publish", () => {
+  it("passes when bus.publish event name matches manifest publishes[]", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: ["demo.signed-up"] } },
+      useCaseBody: `export const signUpUseCase = (bus) => async () => { bus.publish("demo.signed-up", {}); };`,
+    });
+    tester.run("no-undeclared-event-publish", rule, {
+      valid: [{ filename: useCaseFile, code: fs.readFileSync(useCaseFile, "utf8"), options: [{ repoRoot }] }],
+      invalid: [],
+    });
+  });
+
+  it("fires when bus.publish event name is not in manifest", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: [] } },
+      useCaseBody: `export const signUpUseCase = (bus) => async () => { bus.publish("demo.signed-up", {}); };`,
+    });
+    tester.run("no-undeclared-event-publish", rule, {
+      valid: [],
+      invalid: [{
+        filename: useCaseFile,
+        code: fs.readFileSync(useCaseFile, "utf8"),
+        options: [{ repoRoot }],
+        errors: [{ messageId: "undeclared", data: { event: "demo.signed-up", useCase: "signUp" } }],
+      }],
+    });
+  });
+
+  it("is a no-op when bus.publish is called with a non-literal argument", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: [] } },
+      useCaseBody: `export const signUpUseCase = (bus, name) => async () => { bus.publish(name, {}); };`,
+    });
+    tester.run("no-undeclared-event-publish", rule, {
+      valid: [{ filename: useCaseFile, code: fs.readFileSync(useCaseFile, "utf8"), options: [{ repoRoot }] }],
+      invalid: [],
+    });
+  });
+});