diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82142429e04..4751cbe93af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -67,6 +67,7 @@ Docs: https://docs.openclaw.ai
 - Gateway: keep active reply runs visible to stuck-session diagnostics and clear no-active-work recovery state, preventing stale queued lanes after compaction or tool failures. Fixes #80677. (#81302)
 - Codex app-server: rotate incompatible context-engine-managed native threads so Lossless-managed sessions do not resume stale hidden Codex history. (#81223) Thanks @jalehman.
 - Codex cron: execute scheduled command-style automation payloads before workspace bootstrap or memory review, preserving existing isolated cron jobs after Codex harness migration. (#81510) Thanks @jalehman.
+- Plugin LLM completions: honor Codex agent-runtime policy for canonical OpenAI model refs, so context-engine summarizers can use Codex OAuth instead of requiring direct `OPENAI_API_KEY` auth. (#81511) Thanks @jalehman.
 - Gateway/OpenAI HTTP: return OpenAI-compatible 400 errors for invalid sampling params and provider validation failures instead of collapsing them to 500s. (#81275) Thanks @Lellansin.
 - Telegram: publish plugin and skill command description localizations to native command menus while filtering unsupported locale codes and preserving Telegram command limits. (#81351) Thanks @jzakirov.
 - Limit hook CLI tool authority [AI]. (#81065) Thanks @pgondhi987.
diff --git a/scripts/lib/config-boundary-guard.mjs b/scripts/lib/config-boundary-guard.mjs
index 80b4d23ce51..c79a20a8195 100644
--- a/scripts/lib/config-boundary-guard.mjs
+++ b/scripts/lib/config-boundary-guard.mjs
@@ -13,6 +13,8 @@ const COMPAT_CONFIG_API_FILES = new Set([
   "src/plugin-sdk/config-runtime.ts",
   "src/plugin-sdk/memory-core-host-runtime-core.ts",
   "src/plugins/compat/registry.ts",
+  "src/plugins/registry.runtime-config.test.ts",
+  "src/plugins/registry.ts",
   "src/plugins/contracts/config-boundary-guard.test.ts",
   "src/plugins/contracts/deprecated-internal-config-api.test.ts",
   "src/plugins/registry.runtime-config.test.ts",
diff --git a/src/agents/simple-completion-runtime.selection.test.ts b/src/agents/simple-completion-runtime.selection.test.ts
index 39096b307a3..a3c2bedf66c 100644
--- a/src/agents/simple-completion-runtime.selection.test.ts
+++ b/src/agents/simple-completion-runtime.selection.test.ts
@@ -74,6 +74,26 @@ describe("resolveSimpleCompletionSelectionForAgent", () => {
     expect(selection.profileId).toBe("work");
   });
 
+  it("uses Codex execution provider for OpenAI model refs with Codex runtime policy", () => {
+    const cfg = {
+      agents: {
+        defaults: {
+          model: "openai/gpt-5.4-mini",
+          models: {
+            "openai/gpt-5.4-mini": { agentRuntime: { id: "codex" } },
+          },
+        },
+      },
+    } as OpenClawConfig;
+
+    const selection = requireSelection(
+      resolveSimpleCompletionSelectionForAgent({ cfg, agentId: "main" }),
+    );
+    expect(selection.provider).toBe("openai");
+    expect(selection.modelId).toBe("gpt-5.4-mini");
+    expect(selection.runtimeProvider).toBe("openai-codex");
+  });
+
   it("falls back to runtime default model when no explicit model is configured", () => {
     const cfg = {} as OpenClawConfig;
 
diff --git a/src/agents/simple-completion-runtime.test.ts b/src/agents/simple-completion-runtime.test.ts
index f9c13bd031c..ead14d53e13 100644
--- a/src/agents/simple-completion-runtime.test.ts
+++ b/src/agents/simple-completion-runtime.test.ts
@@ -1,5 +1,6 @@
 import type { Model } from "@earendil-works/pi-ai";
 import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../config/types.openclaw.js";
 
 const hoisted = vi.hoisted(() => ({
   resolveModelMock: vi.fn(),
@@ -41,10 +42,14 @@ vi.mock("../plugins/provider-runtime.runtime.js", () => ({
 
 let completeWithPreparedSimpleCompletionModel: typeof import("./simple-completion-runtime.js").completeWithPreparedSimpleCompletionModel;
 let prepareSimpleCompletionModel: typeof import("./simple-completion-runtime.js").prepareSimpleCompletionModel;
+let prepareSimpleCompletionModelForAgent: typeof import("./simple-completion-runtime.js").prepareSimpleCompletionModelForAgent;
 
 beforeAll(async () => {
-  ({ completeWithPreparedSimpleCompletionModel, prepareSimpleCompletionModel } =
-    await import("./simple-completion-runtime.js"));
+  ({
+    completeWithPreparedSimpleCompletionModel,
+    prepareSimpleCompletionModel,
+    prepareSimpleCompletionModelForAgent,
+  } = await import("./simple-completion-runtime.js"));
 });
 
 beforeEach(() => {
@@ -500,6 +505,50 @@ describe("prepareSimpleCompletionModel", () => {
   });
 });
 
+describe("prepareSimpleCompletionModelForAgent", () => {
+  it("uses Codex auth provider for OpenAI model refs with Codex runtime policy", async () => {
+    const cfg = {
+      agents: {
+        defaults: {
+          model: "openai/gpt-5.4-mini",
+          models: {
+            "openai/gpt-5.4-mini": { agentRuntime: { id: "codex" } },
+          },
+        },
+      },
+    } as OpenClawConfig;
+    hoisted.resolveModelMock.mockReturnValueOnce({
+      model: {
+        provider: "openai-codex",
+        id: "gpt-5.4-mini",
+      },
+      authStorage: {
+        setRuntimeApiKey: hoisted.setRuntimeApiKeyMock,
+      },
+      modelRegistry: {},
+    });
+
+    const result = await prepareSimpleCompletionModelForAgent({
+      cfg,
+      agentId: "main",
+    });
+
+    expectPreparedModelResult(result);
+    expect(result.selection.provider).toBe("openai");
+    expect(result.selection.modelId).toBe("gpt-5.4-mini");
+    expect(result.selection.runtimeProvider).toBe("openai-codex");
+    expect(hoisted.resolveModelMock).toHaveBeenCalledWith(
+      "openai-codex",
+      "gpt-5.4-mini",
+      expect.any(String),
+      cfg,
+    );
+    expect(
+      (callArg(hoisted.getApiKeyForModelMock) as { model?: { provider?: string } }).model?.provider,
+    ).toBe("openai-codex");
+  });
+});
+
 describe("completeWithPreparedSimpleCompletionModel", () => {
   it("prepares provider-owned stream APIs before running a completion", async () => {
     const model = {
diff --git a/src/agents/simple-completion-runtime.ts b/src/agents/simple-completion-runtime.ts
index fcece086efc..af6f83a1655 100644
--- a/src/agents/simple-completion-runtime.ts
+++ b/src/agents/simple-completion-runtime.ts
@@ -10,6 +10,7 @@ import { formatErrorMessage } from "../infra/errors.js";
 import { prepareProviderRuntimeAuth } from "../plugins/provider-runtime.runtime.js";
 import { resolveAgentDir, resolveAgentEffectiveModelPrimary } from "./agent-scope.js";
 import { DEFAULT_PROVIDER } from "./defaults.js";
+import { resolveAgentHarnessPolicy } from "./harness/policy.js";
 import {
   applyLocalNoAuthHeaderOverride,
   getApiKeyForModel,
@@ -21,6 +22,7 @@ import {
   resolveDefaultModelForAgent,
   resolveModelRefFromString,
 } from "./model-selection.js";
+import { OPENAI_CODEX_PROVIDER_ID, isOpenAIProvider } from "./openai-codex-routing.js";
 import { resolveModel, resolveModelAsync } from "./pi-embedded-runner/model.js";
 import { prepareModelForSimpleCompletion } from "./simple-completion-transport.js";
 
@@ -55,6 +57,8 @@ export type PreparedSimpleCompletionModel =
 export type AgentSimpleCompletionSelection = {
   provider: string;
   modelId: string;
+  /** Provider used for auth/transport when runtime policy redirects the logical model ref. */
+  runtimeProvider?: string;
   profileId?: string;
   agentDir: string;
 };
@@ -102,11 +106,35 @@ export function resolveSimpleCompletionSelectionForAgent(params: {
   return {
     provider,
     modelId,
+    ...resolveSimpleCompletionRuntimeProvider({
+      cfg: params.cfg,
+      agentId: params.agentId,
+      provider,
+      modelId,
+    }),
     profileId: split?.profile || undefined,
     agentDir: resolveAgentDir(params.cfg, params.agentId),
   };
 }
 
+function resolveSimpleCompletionRuntimeProvider(params: {
+  cfg: OpenClawConfig;
+  agentId: string;
+  provider: string;
+  modelId: string;
+}): Pick<AgentSimpleCompletionSelection, "runtimeProvider"> {
+  if (!isOpenAIProvider(params.provider)) {
+    return {};
+  }
+  const policy = resolveAgentHarnessPolicy({
+    provider: params.provider,
+    modelId: params.modelId,
+    config: params.cfg,
+    agentId: params.agentId,
+  });
+  return policy.runtime === "codex" ? { runtimeProvider: OPENAI_CODEX_PROVIDER_ID } : {};
+}
+
 async function setRuntimeApiKeyForCompletion(params: {
   authStorage: SimpleCompletionAuthStorage;
   model: Model<Api>;
@@ -266,7 +294,7 @@ export async function prepareSimpleCompletionModelForAgent(params: {
   }
   const prepared = await prepareSimpleCompletionModel({
     cfg: params.cfg,
-    provider: selection.provider,
+    provider: selection.runtimeProvider ?? selection.provider,
     modelId: selection.modelId,
     agentDir: selection.agentDir,
     profileId: selection.profileId,