diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a5cf7658db..c46aec3a7e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Docs: https://docs.openclaw.ai
 
 ### Changes
 
+- Agents/runtime: memoize transcript replay-policy resolution for stable config and process-env runs while preserving custom-env provider hook behavior. Thanks @DmitryPogodaev.
 - Infra/path-guards: add a fast path for canonical absolute POSIX containment checks, avoiding repeated `path.resolve` and `path.relative` work in hot filesystem walkers. Refs #75895, #75575, and #68782. Thanks @Enderfga.
 - Tools: add a platform-level tool descriptor planner for descriptor-first visibility, generic availability checks, and executor references. Thanks @shakkernerd.
 - Docs/Codex: clarify that ChatGPT/Codex subscription setups should use `openai/gpt-*` with `agentRuntime.id: "codex"` for native Codex runtime, while `openai-codex/*` remains the PI OAuth route. Thanks @pashpashpash.
diff --git a/src/agents/transcript-policy.test.ts b/src/agents/transcript-policy.test.ts
index 5d97a3fb802..10b3cc437d3 100644
--- a/src/agents/transcript-policy.test.ts
+++ b/src/agents/transcript-policy.test.ts
@@ -1,4 +1,6 @@
 import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../config/types.openclaw.js";
+import { resolveProviderRuntimePlugin } from "../plugins/provider-hook-runtime.js";
 
 vi.mock("../plugins/provider-hook-runtime.js", async () => {
   const replayHelpers = await vi.importActual<
@@ -13,6 +15,7 @@ vi.mock("../plugins/provider-hook-runtime.js", async () => {
           "anthropic",
           "google",
           "github-copilot",
+          "env-sensitive",
           "kilocode",
           "kimi",
           "kimi-code",
@@ -38,9 +41,20 @@ vi.mock("../plugins/provider-hook-runtime.js", async () => {
         return {};
       }
       return {
-        buildReplayPolicy: (context?: { modelId?: string; modelApi?: string }) => {
+        buildReplayPolicy: (context?: {
+          modelId?: string;
+          modelApi?: string;
+          env?: NodeJS.ProcessEnv;
+        }) => {
           const modelId = context?.modelId?.toLowerCase() ?? "";
           switch (provider) {
+            case "env-sensitive":
+              return {
+                sanitizeToolCallIds: context?.env?.OPENCLAW_TEST_TRANSCRIPT_POLICY === "strict",
+                ...(context?.env?.OPENCLAW_TEST_TRANSCRIPT_POLICY === "strict"
+                  ? { toolCallIdMode: "strict" as const }
+                  : {}),
+              };
             case "amazon-bedrock":
             case "anthropic":
               return {
@@ -190,6 +204,7 @@ vi.mock("../plugins/provider-hook-runtime.js", async () => {
 
 let resolveTranscriptPolicy: typeof import("./transcript-policy.js").resolveTranscriptPolicy;
 let shouldAllowProviderOwnedThinkingReplay: typeof import("./transcript-policy.js").shouldAllowProviderOwnedThinkingReplay;
+const mockResolveProviderRuntimePlugin = vi.mocked(resolveProviderRuntimePlugin);
 
 describe("resolveTranscriptPolicy", () => {
   beforeAll(async () => {
@@ -225,6 +240,56 @@ describe("resolveTranscriptPolicy", () => {
     expect(policy.toolCallIdMode).toBe("strict");
   });
 
+  it("memoizes replay policy resolution for the same config and process env", () => {
+    const config = {} as OpenClawConfig;
+
+    resolveTranscriptPolicy({
+      provider: "mistral",
+      modelId: "mistral-large-latest",
+      config,
+      env: process.env,
+    });
+    resolveTranscriptPolicy({
+      provider: "mistral",
+      modelId: "mistral-large-latest",
+      config,
+      env: process.env,
+    });
+
+    expect(mockResolveProviderRuntimePlugin).toHaveBeenCalledTimes(1);
+  });
+
+  it("does not reuse cached replay policies across custom env objects", () => {
+    const config = {} as OpenClawConfig;
+    const strictEnv = {
+      ...process.env,
+      OPENCLAW_TEST_TRANSCRIPT_POLICY: "strict",
+    };
+    const looseEnv = {
+      ...process.env,
+      OPENCLAW_TEST_TRANSCRIPT_POLICY: "loose",
+    };
+
+    const strictPolicy = resolveTranscriptPolicy({
+      provider: "env-sensitive",
+      modelId: "env-demo",
+      config,
+      env: strictEnv,
+    });
+    const loosePolicy = resolveTranscriptPolicy({
+      provider: "env-sensitive",
+      modelId: "env-demo",
+      config,
+      env: looseEnv,
+    });
+
+    expect(strictPolicy.sanitizeToolCallIds).toBe(true);
+    expect(strictPolicy.toolCallIdMode).toBe("strict");
+    expect(loosePolicy.sanitizeToolCallIds).toBe(false);
+    expect(loosePolicy.toolCallIdMode).toBeUndefined();
+    expect(mockResolveProviderRuntimePlugin).toHaveBeenCalledTimes(2);
+  });
+
   it("enables sanitizeToolCallIds for Google provider", () => {
     const policy = resolveTranscriptPolicy({
       provider: "google",
diff --git a/src/agents/transcript-policy.ts b/src/agents/transcript-policy.ts
index ea02a45263e..f686ae4a916 100644
--- a/src/agents/transcript-policy.ts
+++ b/src/agents/transcript-policy.ts
@@ -1,4 +1,5 @@
 import type { OpenClawConfig } from "../config/types.openclaw.js";
+import { resolvePluginControlPlaneFingerprint } from "../plugins/plugin-control-plane-context.js";
 import { resolveProviderRuntimePlugin } from "../plugins/provider-hook-runtime.js";
 import { shouldPreserveThinkingBlocks } from "../plugins/provider-replay-helpers.js";
 import type { ProviderRuntimeModel } from "../plugins/provider-runtime-model.types.js";
@@ -177,6 +178,39 @@ function mergeTranscriptPolicy(
   };
 }
 
+const transcriptPolicyCache = new WeakMap<OpenClawConfig, Map<string, TranscriptPolicy>>();
+
+function canCacheTranscriptPolicy(params: {
+  config?: OpenClawConfig;
+  env?: NodeJS.ProcessEnv;
+}): params is { config: OpenClawConfig; env?: NodeJS.ProcessEnv } {
+  if (!params.config) {
+    return false;
+  }
+  return !params.env || params.env === process.env;
+}
+
+function resolveTranscriptPolicyCacheKey(params: {
+  modelApi?: string | null;
+  provider: string;
+  modelId?: string | null;
+  config: OpenClawConfig;
+  workspaceDir?: string;
+  env?: NodeJS.ProcessEnv;
+}): string {
+  return JSON.stringify({
+    provider: params.provider,
+    modelApi: params.modelApi ?? "",
+    modelId: params.modelId ?? "",
+    workspaceDir: params.workspaceDir ?? "",
+    pluginControlPlane: resolvePluginControlPlaneFingerprint({
+      config: params.config,
+      workspaceDir: params.workspaceDir,
+      env: params.env,
+    }),
+  });
+}
+
 export function resolveTranscriptPolicy(params: {
   modelApi?: string | null;
   provider?: string | null;
@@ -187,6 +221,15 @@ export function resolveTranscriptPolicy(params: {
   model?: ProviderRuntimeModel;
 }): TranscriptPolicy {
   const provider = normalizeProviderId(params.provider ?? "");
+  const cacheKey = canCacheTranscriptPolicy(params)
+    ? resolveTranscriptPolicyCacheKey({ ...params, provider, config: params.config })
+    : undefined;
+  if (cacheKey) {
+    const cached = transcriptPolicyCache.get(params.config)?.get(cacheKey);
+    if (cached) {
+      return cached;
+    }
+  }
   const runtimePlugin = provider
     ? resolveProviderRuntimePlugin({
         provider,
@@ -208,15 +251,21 @@ export function resolveTranscriptPolicy(params: {
   // Once a provider adopts the replay-policy hook, replay policy should come
   // from the plugin, not from transport-family defaults in core.
   const buildReplayPolicy = runtimePlugin?.buildReplayPolicy;
-  if (buildReplayPolicy) {
-    const pluginPolicy = buildReplayPolicy(context);
-    return mergeTranscriptPolicy(pluginPolicy ?? undefined);
+  const policy = buildReplayPolicy
+    ? mergeTranscriptPolicy(buildReplayPolicy(context) ?? undefined)
+    : mergeTranscriptPolicy(
+        buildUnownedProviderTransportReplayFallback({
+          modelApi: params.modelApi,
+          modelId: params.modelId,
+        }),
+      );
+  if (cacheKey) {
+    let configCache = transcriptPolicyCache.get(params.config);
+    if (!configCache) {
+      configCache = new Map();
+      transcriptPolicyCache.set(params.config, configCache);
+    }
+    configCache.set(cacheKey, policy);
   }
-
-  return mergeTranscriptPolicy(
-    buildUnownedProviderTransportReplayFallback({
-      modelApi: params.modelApi,
-      modelId: params.modelId,
-    }),
-  );
+  return policy;
 }