diff --git a/src/config/schema.ts b/src/config/schema.ts
index 936c96a8..3b70a31f 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -101,6 +101,7 @@ export const HookNameSchema = z.enum([
   "stop-continuation-guard",
   "tasks-todowrite-disabler",
   "write-existing-file-guard",
+  "anthropic-effort",
 ])
 
 export const BuiltinCommandNameSchema = z.enum([
diff --git a/src/index.ts b/src/index.ts
index f1750aee..ee210e66 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -40,6 +40,7 @@ import {
   createTasksTodowriteDisablerHook,
   createWriteExistingFileGuardHook,
 } from "./hooks";
+import { createAnthropicEffortHook } from "./hooks/anthropic-effort";
 import {
   contextCollector,
   createContextInjectorMessagesTransformHook,
@@ -294,6 +295,10 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
 
   const taskResumeInfo = createTaskResumeInfoHook();
 
+  const anthropicEffort = isHookEnabled("anthropic-effort")
+    ? createAnthropicEffortHook()
+    : null;
+
   const tmuxSessionManager = new TmuxSessionManager(ctx, tmuxConfig);
 
   const backgroundManager = new BackgroundManager(
@@ -550,6 +555,29 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
   return {
     tool: filteredTools,
 
+    "chat.params": async (
+      input: {
+        sessionID: string
+        agent: string
+        model: Record<string, unknown>
+        provider: Record<string, unknown>
+        message: Record<string, unknown>
+      },
+      output: {
+        temperature: number
+        topP: number
+        topK: number
+        options: Record<string, unknown>
+      },
+    ) => {
+      const model = input.model as { providerID: string; modelID: string }
+      const message = input.message as { variant?: string }
+      await anthropicEffort?.["chat.params"]?.(
+        { ...input, agent: { name: input.agent }, model, provider: input.provider as { id: string }, message },
+        output,
+      );
+    },
+
     "chat.message": async (input, output) => {
       if (input.agent) {
         setSessionAgent(input.sessionID, input.agent);