diff --git a/extensions/anthropic/api.ts b/extensions/anthropic/api.ts
index f45884dc9d7..6fcd8f8e147 100644
--- a/extensions/anthropic/api.ts
+++ b/extensions/anthropic/api.ts
@@ -6,4 +6,5 @@ export {
   resolveAnthropicBetas,
   resolveAnthropicFastMode,
   resolveAnthropicServiceTier,
+  wrapAnthropicProviderStream,
 } from "./stream-wrappers.js";
diff --git a/extensions/anthropic/contract-api.ts b/extensions/anthropic/contract-api.ts
index 4878de5c363..34f998720bf 100644
--- a/extensions/anthropic/contract-api.ts
+++ b/extensions/anthropic/contract-api.ts
@@ -5,4 +5,5 @@ export {
   resolveAnthropicBetas,
   resolveAnthropicFastMode,
   resolveAnthropicServiceTier,
+  wrapAnthropicProviderStream,
 } from "./stream-wrappers.js";
diff --git a/extensions/anthropic/register.runtime.ts b/extensions/anthropic/register.runtime.ts
index 3f560bf9ff8..d0be287114b 100644
--- a/extensions/anthropic/register.runtime.ts
+++ b/extensions/anthropic/register.runtime.ts
@@ -18,7 +18,6 @@ import {
 } from "openclaw/plugin-sdk/provider-auth";
 import { createProviderApiKeyAuthMethod } from "openclaw/plugin-sdk/provider-auth-api-key";
 import { cloneFirstTemplateModel } from "openclaw/plugin-sdk/provider-model-shared";
-import { composeProviderStreamWrappers } from "openclaw/plugin-sdk/provider-stream";
 import { fetchClaudeUsage } from "openclaw/plugin-sdk/provider-usage";
 import { buildAnthropicCliBackend } from "./cli-backend.js";
 import { buildAnthropicCliMigrationResult, hasClaudeCliAuth } from "./cli-migration.js";
@@ -29,12 +28,7 @@ import {
 import { anthropicMediaUnderstandingProvider } from "./media-understanding-provider.js";
 import { buildAnthropicReplayPolicy } from "./replay-policy.js";
 import {
-  createAnthropicBetaHeadersWrapper,
-  createAnthropicFastModeWrapper,
-  createAnthropicServiceTierWrapper,
-  resolveAnthropicBetas,
-  resolveAnthropicFastMode,
-  resolveAnthropicServiceTier,
+  wrapAnthropicProviderStream,
 } from "./stream-wrappers.js";
 
 const PROVIDER_ID = "anthropic";
@@ -281,23 +275,7 @@ export async function registerAnthropicPlugin(api: OpenClawPluginApi): Promise<v
     buildReplayPolicy: (ctx) => buildAnthropicReplayPolicy(ctx),
     isModernModelRef: ({ modelId }) => matchesAnthropicModernModel(modelId),
     resolveReasoningOutputMode: () => "native",
-    wrapStreamFn: (ctx) => {
-      const anthropicBetas = resolveAnthropicBetas(ctx.extraParams, ctx.modelId);
-      const serviceTier = resolveAnthropicServiceTier(ctx.extraParams);
-      const fastMode = resolveAnthropicFastMode(ctx.extraParams);
-      return composeProviderStreamWrappers(
-        ctx.streamFn,
-        anthropicBetas?.length
-          ? (streamFn) => createAnthropicBetaHeadersWrapper(streamFn, anthropicBetas)
-          : undefined,
-        serviceTier
-          ? (streamFn) => createAnthropicServiceTierWrapper(streamFn, serviceTier)
-          : undefined,
-        fastMode !== undefined
-          ? (streamFn) => createAnthropicFastModeWrapper(streamFn, fastMode)
-          : undefined,
-      );
-    },
+    wrapStreamFn: (ctx) => wrapAnthropicProviderStream(ctx),
     resolveDefaultThinkingLevel: ({ modelId }) =>
       matchesAnthropicModernModel(modelId) &&
       (modelId.toLowerCase().startsWith(ANTHROPIC_OPUS_46_MODEL_ID) ||
diff --git a/extensions/anthropic/stream-wrappers.test.ts b/extensions/anthropic/stream-wrappers.test.ts
index 4cde2e2bd23..3ea20c14ce6 100644
--- a/extensions/anthropic/stream-wrappers.test.ts
+++ b/extensions/anthropic/stream-wrappers.test.ts
@@ -1,6 +1,10 @@
 import type { StreamFn } from "@mariozechner/pi-agent-core";
 import { afterEach, describe, expect, it, vi } from "vitest";
-import { __testing, createAnthropicBetaHeadersWrapper } from "./stream-wrappers.js";
+import {
+  __testing,
+  createAnthropicBetaHeadersWrapper,
+  wrapAnthropicProviderStream,
+} from "./stream-wrappers.js";
 
 const CONTEXT_1M_BETA = "context-1m-2025-08-07";
 const OAUTH_BETA = "oauth-2025-04-20";
@@ -41,4 +45,30 @@ describe("anthropic stream wrappers", () => {
     expect(headers?.["anthropic-beta"]).toContain(CONTEXT_1M_BETA);
     expect(warn).not.toHaveBeenCalled();
   });
+
+  it("composes the anthropic provider stream chain from extra params", () => {
+    const captured: { headers?: Record<string, string>; payload?: Record<string, unknown> } = {};
+    const base: StreamFn = (model, _context, options) => {
+      captured.headers = options?.headers;
+      const payload = {} as Record<string, unknown>;
+      options?.onPayload?.(payload as never, model as never);
+      captured.payload = payload;
+      return {} as never;
+    };
+
+    const wrapped = wrapAnthropicProviderStream({
+      streamFn: base,
+      modelId: "claude-sonnet-4-6",
+      extraParams: { context1m: true, serviceTier: "auto" },
+    } as never);
+
+    wrapped?.(
+      { provider: "anthropic", api: "anthropic-messages", id: "claude-sonnet-4-6" } as never,
+      {} as never,
+      { apiKey: "sk-ant-api-123" } as never,
+    );
+
+    expect(captured.headers?.["anthropic-beta"]).toContain(CONTEXT_1M_BETA);
+    expect(captured.payload).toMatchObject({ service_tier: "auto" });
+  });
 });
diff --git a/extensions/anthropic/stream-wrappers.ts b/extensions/anthropic/stream-wrappers.ts
index 9e929986577..b70451b4e6d 100644
--- a/extensions/anthropic/stream-wrappers.ts
+++ b/extensions/anthropic/stream-wrappers.ts
@@ -1,7 +1,9 @@
 import type { StreamFn } from "@mariozechner/pi-agent-core";
 import { streamSimple } from "@mariozechner/pi-ai";
+import type { ProviderWrapStreamFnContext } from "openclaw/plugin-sdk/plugin-entry";
 import {
   applyAnthropicPayloadPolicyToParams,
+  composeProviderStreamWrappers,
   resolveAnthropicPayloadPolicy,
   streamWithPayloadPatch,
 } from "openclaw/plugin-sdk/provider-stream";
@@ -208,4 +210,22 @@ export function resolveAnthropicServiceTier(
   return normalized;
 }
 
+export function wrapAnthropicProviderStream(ctx: ProviderWrapStreamFnContext): StreamFn | undefined {
+  const anthropicBetas = resolveAnthropicBetas(ctx.extraParams, ctx.modelId);
+  const serviceTier = resolveAnthropicServiceTier(ctx.extraParams);
+  const fastMode = resolveAnthropicFastMode(ctx.extraParams);
+  return composeProviderStreamWrappers(
+    ctx.streamFn,
+    anthropicBetas?.length
+      ? (streamFn) => createAnthropicBetaHeadersWrapper(streamFn, anthropicBetas)
+      : undefined,
+    serviceTier
+      ? (streamFn) => createAnthropicServiceTierWrapper(streamFn, serviceTier)
+      : undefined,
+    fastMode !== undefined
+      ? (streamFn) => createAnthropicFastModeWrapper(streamFn, fastMode)
+      : undefined,
+  );
+}
+
 export const __testing = { log };