docs: add API usage guide with multi-language code examples

curl, Python(Anthropic/OpenAI SDK), Node.js(Anthropic/OpenAI SDK),
Claude Code CLI 등 다양한 호출 방법 정리

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

API_USAGE.md

@@ -0,0 +1,343 @@
+# CLIProxyAPI 호출 가이드
+
+## 접속 정보
+
+| 항목 | 값 |
+|------|-----|
+| 외부 URL | `https://cliproxy.gru.farm` |
+| 내부 URL | `http://192.168.0.17:8317` |
+| API 키 | `Jinie4eva!` |
+| 인증 방식 | `Authorization: Bearer <API키>` |
+
+## 엔드포인트
+
+| 용도 | 경로 |
+|------|------|
+| Claude 네이티브 (권장) | `/api/provider/claude/v1/messages` |
+| OpenAI 호환 | `/v1/chat/completions` |
+| 모델 목록 | `/v1/models` |
+
+## 사용 가능한 모델
+
+| 모델 ID | 설명 |
+|---------|------|
+| `claude-sonnet-4-6` | Claude Sonnet 4.6 (최신, 권장) |
+| `claude-opus-4-6` | Claude Opus 4.6 (최고 성능) |
+| `claude-sonnet-4-5-20250929` | Claude Sonnet 4.5 |
+| `claude-opus-4-5-20251101` | Claude Opus 4.5 |
+| `claude-haiku-4-5-20251001` | Claude Haiku 4.5 (경량/빠름) |
+| `claude-sonnet-4-20250514` | Claude Sonnet 4 |
+| `claude-opus-4-20250514` | Claude Opus 4 |
+| `claude-3-7-sonnet-20250219` | Claude 3.7 Sonnet |
+| `claude-3-5-haiku-20241022` | Claude 3.5 Haiku |
+
+---
+
+## 1. curl
+
+### 기본 호출
+
+```bash
+curl -X POST https://cliproxy.gru.farm/api/provider/claude/v1/messages \
+  -H "Authorization: Bearer Jinie4eva!" \
+  -H "anthropic-version: 2023-06-01" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "claude-sonnet-4-6",
+    "max_tokens": 1024,
+    "messages": [
+      {"role": "user", "content": "안녕! 간단히 소개해줘"}
+    ]
+  }'
+```
+
+### 스트리밍
+
+```bash
+curl -X POST https://cliproxy.gru.farm/api/provider/claude/v1/messages \
+  -H "Authorization: Bearer Jinie4eva!" \
+  -H "anthropic-version: 2023-06-01" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "claude-sonnet-4-6",
+    "max_tokens": 1024,
+    "stream": true,
+    "messages": [
+      {"role": "user", "content": "안녕!"}
+    ]
+  }'
+```
+
+### 모델 목록 조회
+
+```bash
+curl https://cliproxy.gru.farm/v1/models \
+  -H "Authorization: Bearer Jinie4eva!"
+```
+
+---
+
+## 2. Python — Anthropic SDK
+
+### 설치
+
+```bash
+pip install anthropic
+```
+
+### 기본 호출
+
+```python
+from anthropic import Anthropic
+
+client = Anthropic(
+    base_url="https://cliproxy.gru.farm/api/provider/claude",
+    api_key="Jinie4eva!"
+)
+
+response = client.messages.create(
+    model="claude-sonnet-4-6",
+    max_tokens=1024,
+    messages=[
+        {"role": "user", "content": "안녕! 간단히 소개해줘"}
+    ]
+)
+
+print(response.content[0].text)
+```
+
+### 스트리밍
+
+```python
+from anthropic import Anthropic
+
+client = Anthropic(
+    base_url="https://cliproxy.gru.farm/api/provider/claude",
+    api_key="Jinie4eva!"
+)
+
+with client.messages.stream(
+    model="claude-sonnet-4-6",
+    max_tokens=1024,
+    messages=[
+        {"role": "user", "content": "안녕! 간단히 소개해줘"}
+    ]
+) as stream:
+    for text in stream.text_stream:
+        print(text, end="", flush=True)
+```
+
+### 시스템 프롬프트 + 멀티턴
+
+```python
+from anthropic import Anthropic
+
+client = Anthropic(
+    base_url="https://cliproxy.gru.farm/api/provider/claude",
+    api_key="Jinie4eva!"
+)
+
+response = client.messages.create(
+    model="claude-sonnet-4-6",
+    max_tokens=1024,
+    system="당신은 친절한 한국어 AI 어시스턴트입니다.",
+    messages=[
+        {"role": "user", "content": "파이썬이 뭐야?"},
+        {"role": "assistant", "content": "파이썬은 프로그래밍 언어입니다."},
+        {"role": "user", "content": "그럼 자바스크립트는?"}
+    ]
+)
+
+print(response.content[0].text)
+```
+
+---
+
+## 3. Python — OpenAI SDK (호환 모드)
+
+### 설치
+
+```bash
+pip install openai
+```
+
+### 기본 호출
+
+```python
+from openai import OpenAI
+
+client = OpenAI(
+    base_url="https://cliproxy.gru.farm/v1",
+    api_key="Jinie4eva!"
+)
+
+response = client.chat.completions.create(
+    model="claude-sonnet-4-6",
+    messages=[
+        {"role": "user", "content": "안녕!"}
+    ]
+)
+
+print(response.choices[0].message.content)
+```
+
+### 스트리밍
+
+```python
+from openai import OpenAI
+
+client = OpenAI(
+    base_url="https://cliproxy.gru.farm/v1",
+    api_key="Jinie4eva!"
+)
+
+stream = client.chat.completions.create(
+    model="claude-sonnet-4-6",
+    messages=[{"role": "user", "content": "안녕!"}],
+    stream=True
+)
+
+for chunk in stream:
+    if chunk.choices[0].delta.content:
+        print(chunk.choices[0].delta.content, end="", flush=True)
+```
+
+---
+
+## 4. Node.js — Anthropic SDK
+
+### 설치
+
+```bash
+npm install @anthropic-ai/sdk
+```
+
+### 기본 호출
+
+```javascript
+import Anthropic from "@anthropic-ai/sdk";
+
+const client = new Anthropic({
+  baseURL: "https://cliproxy.gru.farm/api/provider/claude",
+  apiKey: "Jinie4eva!",
+});
+
+const response = await client.messages.create({
+  model: "claude-sonnet-4-6",
+  max_tokens: 1024,
+  messages: [{ role: "user", content: "안녕!" }],
+});
+
+console.log(response.content[0].text);
+```
+
+### 스트리밍
+
+```javascript
+import Anthropic from "@anthropic-ai/sdk";
+
+const client = new Anthropic({
+  baseURL: "https://cliproxy.gru.farm/api/provider/claude",
+  apiKey: "Jinie4eva!",
+});
+
+const stream = client.messages.stream({
+  model: "claude-sonnet-4-6",
+  max_tokens: 1024,
+  messages: [{ role: "user", content: "안녕!" }],
+});
+
+for await (const chunk of stream) {
+  if (
+    chunk.type === "content_block_delta" &&
+    chunk.delta.type === "text_delta"
+  ) {
+    process.stdout.write(chunk.delta.text);
+  }
+}
+```
+
+---
+
+## 5. Node.js — OpenAI SDK (호환 모드)
+
+### 설치
+
+```bash
+npm install openai
+```
+
+### 기본 호출
+
+```javascript
+import OpenAI from "openai";
+
+const client = new OpenAI({
+  baseURL: "https://cliproxy.gru.farm/v1",
+  apiKey: "Jinie4eva!",
+});
+
+const response = await client.chat.completions.create({
+  model: "claude-sonnet-4-6",
+  messages: [{ role: "user", content: "안녕!" }],
+});
+
+console.log(response.choices[0].message.content);
+```
+
+---
+
+## 6. Claude Code CLI
+
+```bash
+export ANTHROPIC_BASE_URL=https://cliproxy.gru.farm/api/provider/claude
+export ANTHROPIC_API_KEY=Jinie4eva!
+
+claude
+```
+
+영구 적용 (`~/.zshrc` 또는 `~/.bashrc`):
+
+```bash
+echo 'export ANTHROPIC_BASE_URL=https://cliproxy.gru.farm/api/provider/claude' >> ~/.zshrc
+echo 'export ANTHROPIC_API_KEY=Jinie4eva!' >> ~/.zshrc
+source ~/.zshrc
+```
+
+---
+
+## 7. 환경변수로 관리
+
+`.env` 파일:
+
+```env
+ANTHROPIC_BASE_URL=https://cliproxy.gru.farm/api/provider/claude
+ANTHROPIC_API_KEY=Jinie4eva!
+```
+
+Python에서 `.env` 사용:
+
+```python
+from dotenv import load_dotenv
+from anthropic import Anthropic
+
+load_dotenv()
+
+# base_url, api_key 자동으로 환경변수에서 읽음
+client = Anthropic()
+
+response = client.messages.create(
+    model="claude-sonnet-4-6",
+    max_tokens=1024,
+    messages=[{"role": "user", "content": "안녕!"}]
+)
+print(response.content[0].text)
+```
+
+---
+
+## 주의사항
+
+- **내부망 접근 시** URL을 `http://192.168.0.17:8317`로 변경
+- **OpenAI 호환 모드**는 `/v1/chat/completions`를 사용하지만, Claude 네이티브 기능(extended thinking 등)은 `/api/provider/claude/v1/messages` 사용 권장
+- **타임아웃** 설정: 긴 응답의 경우 클라이언트 타임아웃을 600초 이상으로 설정

DOCKER_DEPLOY.md

@@ -0,0 +1,212 @@
+# CLIProxyAPI Docker 배포 가이드
+
+NAS(nas.gru.farm)에 Docker로 CLIProxyAPI를 배포하는 방법을 정리합니다.
+
+## 사전 조건
+
+| 항목 | 내용 |
+|------|------|
+| NAS 접속 | `ssh airkjw@nas.gru.farm -p 22` |
+| Docker | `sudo /usr/local/bin/docker` (NOPASSWD) |
+| Docker Compose | `sudo /usr/local/bin/docker compose` |
+| NAS 내부 IP | 192.168.0.17 |
+
+## 1. 배포 디렉토리 준비
+
+```bash
+ssh airkjw@nas.gru.farm
+
+# 배포 디렉토리 생성
+mkdir -p ~/docker/cli-proxy-api
+cd ~/docker/cli-proxy-api
+```
+
+## 2. 필요 파일 구성
+
+NAS에 아래 파일들이 필요합니다:
+
+```
+~/docker/cli-proxy-api/
+├── docker-compose.yml    # 컨테이너 설정
+├── config.yaml           # 서비스 설정 (API 키, 포트 등)
+├── auths/                # OAuth 인증 데이터 (자동 생성)
+└── logs/                 # 로그 디렉토리 (자동 생성)
+```
+
+## 3. docker-compose.yml
+
+로컬 빌드 방식 (소스에서 직접 빌드):
+
+```yaml
+services:
+  cli-proxy-api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: cli-proxy-api
+    ports:
+      - "8317:8317"       # 메인 API 포트
+      # 필요시 추가 포트 오픈
+      # - "8085:8085"
+    volumes:
+      - ./config.yaml:/CLIProxyAPI/config.yaml
+      - ./auths:/root/.cli-proxy-api
+      - ./logs:/CLIProxyAPI/logs
+    environment:
+      - TZ=Asia/Seoul
+    restart: unless-stopped
+```
+
+또는 공식 이미지 사용:
+
+```yaml
+services:
+  cli-proxy-api:
+    image: eceasy/cli-proxy-api:latest
+    container_name: cli-proxy-api
+    ports:
+      - "8317:8317"
+    volumes:
+      - ./config.yaml:/CLIProxyAPI/config.yaml
+      - ./auths:/root/.cli-proxy-api
+      - ./logs:/CLIProxyAPI/logs
+    environment:
+      - TZ=Asia/Seoul
+    restart: unless-stopped
+```
+
+## 4. config.yaml 설정
+
+`config.example.yaml`을 기반으로 작성합니다.
+
+### 최소 설정 예시
+
+```yaml
+# 서버 바인딩
+host: ""
+port: 8317
+
+# API 키 (클라이언트 인증용, 원하는 값으로 설정)
+api-keys:
+  - "my-secret-api-key-1"
+
+# 디버그 (초기 설정 시 true 권장, 안정화 후 false)
+debug: false
+
+# 로그를 파일로 기록
+logging-to-file: true
+logs-max-total-size-mb: 100
+
+# 재시도 설정
+request-retry: 3
+```
+
+### Claude API 키 사용 시 추가
+
+```yaml
+claude-api-key:
+  - api-key: "sk-ant-xxxxx"
+    # base-url: "https://api.anthropic.com"  # 기본값이므로 생략 가능
+```
+
+### Gemini API 키 사용 시 추가
+
+```yaml
+gemini-api-key:
+  - api-key: "AIzaSy..."
+```
+
+### Management UI 활성화 (웹 관리 패널)
+
+```yaml
+remote-management:
+  allow-remote: true
+  secret-key: "my-management-password"
+  disable-control-panel: false
+```
+
+## 5. 배포 실행
+
+```bash
+cd ~/docker/cli-proxy-api
+
+# 공식 이미지 사용 시
+sudo /usr/local/bin/docker compose up -d
+
+# 소스 빌드 시 (Gitea에서 소스 가져와서)
+git clone http://nas.gru.farm:3001/airkjw/CLIProxyAPI.git src
+sudo /usr/local/bin/docker compose -f src/docker-compose.yml up -d --build
+```
+
+## 6. 확인
+
+```bash
+# 컨테이너 상태 확인
+sudo /usr/local/bin/docker ps | grep cli-proxy-api
+
+# 로그 확인
+sudo /usr/local/bin/docker logs cli-proxy-api
+
+# API 응답 테스트
+curl http://localhost:8317/
+curl http://192.168.0.17:8317/
+
+# 모델 목록 확인 (API 키 인증)
+curl -H "Authorization: Bearer my-secret-api-key-1" http://localhost:8317/v1/models
+```
+
+## 7. 클라이언트 연결
+
+CLIProxyAPI가 실행되면 각 AI CLI 도구에서 프록시 주소로 연결합니다.
+
+### Claude Code에서 사용
+
+```bash
+# 환경변수 설정
+export ANTHROPIC_BASE_URL=http://192.168.0.17:8317
+export ANTHROPIC_API_KEY=my-secret-api-key-1
+```
+
+### OpenAI 호환 클라이언트에서 사용
+
+```bash
+export OPENAI_BASE_URL=http://192.168.0.17:8317/v1
+export OPENAI_API_KEY=my-secret-api-key-1
+```
+
+## 8. 관리 & 운영
+
+```bash
+# 컨테이너 중지
+sudo /usr/local/bin/docker compose down
+
+# 설정 변경 후 재시작
+sudo /usr/local/bin/docker compose restart
+
+# 이미지 업데이트 (공식 이미지 사용 시)
+sudo /usr/local/bin/docker compose pull
+sudo /usr/local/bin/docker compose up -d
+
+# 로그 실시간 모니터링
+sudo /usr/local/bin/docker logs -f cli-proxy-api
+```
+
+## 포트 목록
+
+| 포트 | 용도 | 필수 여부 |
+|------|------|-----------|
+| 8317 | 메인 API | 필수 |
+| 8085 | 추가 API | 선택 |
+| 1455 | 추가 서비스 | 선택 |
+| 54545 | 추가 서비스 | 선택 |
+| 51121 | 추가 서비스 | 선택 |
+| 11451 | 추가 서비스 | 선택 |
+
+> 기본적으로 8317 포트만 열면 됩니다. 나머지는 특정 기능 사용 시 필요합니다.
+
+## 주의사항
+
+- `config.yaml`은 `.gitignore`에 포함되어 있어 Git에 커밋되지 않음 (API 키 보호)
+- OAuth 인증(Claude, Gemini 등)은 최초 1회 브라우저 로그인 필요
+- `auths/` 디렉토리를 볼륨으로 마운트하면 컨테이너 재생성 시에도 인증 유지
+- NAS 외부 접근 시 방화벽/포트포워딩 설정 필요

README.md

@@ -126,10 +126,6 @@ Browser-based tool to translate SRT subtitles using your Gemini subscription via
 
 CLI wrapper for instant switching between multiple Claude accounts and alternative models (Gemini, Codex, Antigravity) via CLIProxyAPI OAuth - no API keys needed
 
-### [ProxyPal](https://github.com/heyhuynhgiabuu/proxypal)
-
-Native macOS GUI for managing CLIProxyAPI: configure providers, model mappings, and endpoints via OAuth - no API keys needed.
-
 ### [Quotio](https://github.com/nguyenphutrong/quotio)
 
 Native macOS menu bar app that unifies Claude, Gemini, OpenAI, Qwen, and Antigravity subscriptions with real-time quota tracking and smart auto-failover for AI coding tools like Claude Code, OpenCode, and Droid - no API keys needed.

README_CN.md

@@ -125,10 +125,6 @@ CLIProxyAPI 已内置对 [Amp CLI](https://ampcode.com) 和 Amp IDE 扩展的支
 
 CLI 封装器，用于通过 CLIProxyAPI OAuth 即时切换多个 Claude 账户和替代模型（Gemini, Codex, Antigravity），无需 API 密钥。
 
-### [ProxyPal](https://github.com/heyhuynhgiabuu/proxypal)
-
-基于 macOS 平台的原生 CLIProxyAPI GUI：配置供应商、模型映射以及OAuth端点，无需 API 密钥。
-
 ### [Quotio](https://github.com/nguyenphutrong/quotio)
 
 原生 macOS 菜单栏应用，统一管理 Claude、Gemini、OpenAI、Qwen 和 Antigravity 订阅，提供实时配额追踪和智能自动故障转移，支持 Claude Code、OpenCode 和 Droid 等 AI 编程工具，无需 API 密钥。

README_JA.md

@@ -126,10 +126,6 @@ CLIProxyAPI経由でGeminiサブスクリプションを使用してSRT字幕を
 
 CLIProxyAPI OAuthを使用して複数のClaudeアカウントや代替モデル（Gemini、Codex、Antigravity）を即座に切り替えるCLIラッパー - APIキー不要
 
-### [ProxyPal](https://github.com/heyhuynhgiabuu/proxypal)
-
-CLIProxyAPI管理用のmacOSネイティブGUI：OAuth経由でプロバイダー、モデルマッピング、エンドポイントを設定 - APIキー不要
-
 ### [Quotio](https://github.com/nguyenphutrong/quotio)
 
 Claude、Gemini、OpenAI、Qwen、Antigravityのサブスクリプションを統合し、リアルタイムのクォータ追跡とスマート自動フェイルオーバーを備えたmacOSネイティブのメニューバーアプリ。Claude Code、OpenCode、Droidなどのコーディングツール向け - APIキー不要

REVERSE_PROXY_SETUP.md

@@ -0,0 +1,104 @@
+# CLIProxyAPI 역방향 프록시 & HTTPS 설정 가이드
+
+외부에서 `https://cliproxy.gru.farm`으로 CLIProxyAPI에 접근하기 위한 설정입니다.
+
+## 1단계: DNS 레코드 추가
+
+hostcocoa.com DNS 관리에서 A 레코드를 추가합니다.
+
+| 타입 | 호스트 | 값 |
+|------|--------|-----|
+| A | cliproxy | 125.188.185.74 |
+
+> 기존 `nas.gru.farm`, `haesol.gru.farm` 등과 같은 IP입니다.
+
+## 2단계: Synology DSM 역방향 프록시 설정
+
+1. DSM 웹 UI 접속 (보통 `https://nas.gru.farm:5001`)
+2. **제어판** → **로그인 포털** → **고급** 탭 → **역방향 프록시** 클릭
+3. **생성** 버튼 클릭
+4. 아래와 같이 입력:
+
+### 일반 설정
+
+| 항목 | 값 |
+|------|-----|
+| 설명 | `CLIProxyAPI` |
+| **소스 (프론트엔드)** | |
+| 프로토콜 | `HTTPS` |
+| 호스트 이름 | `cliproxy.gru.farm` |
+| 포트 | `443` |
+| HSTS | 비활성화 |
+| **대상 (백엔드)** | |
+| 프로토콜 | `HTTP` |
+| 호스트 이름 | `localhost` |
+| 포트 | `8317` |
+
+### 사용자 지정 헤더 (선택)
+
+필요 시 WebSocket 지원을 위해 사용자 지정 헤더 추가:
+- `Upgrade` → `$http_upgrade`
+- `Connection` → `$connection_upgrade`
+
+### 타임아웃 설정
+
+AI 요청은 응답이 오래 걸릴 수 있으므로 타임아웃을 늘려주세요:
+- 연결 타임아웃: `600`
+- 전송 타임아웃: `600`
+- 수신 타임아웃: `600`
+
+5. **저장** 클릭
+
+## 3단계: SSL 인증서 설정
+
+Synology DSM에서 `cliproxy.gru.farm` 용 SSL 인증서를 설정합니다.
+
+### Let's Encrypt 인증서 발급 (권장)
+
+1. **제어판** → **보안** → **인증서** 탭
+2. **추가** → **새 인증서 추가** → **Let's Encrypt에서 인증서 가져오기**
+3. 도메인: `cliproxy.gru.farm`
+4. 이메일: 본인 이메일
+5. 발급 완료 후, **설정** 버튼 클릭
+6. `cliproxy.gru.farm` 역방향 프록시 항목에 방금 발급한 인증서 선택
+
+### 기존 와일드카드 인증서가 있는 경우
+
+`*.gru.farm` 와일드카드 인증서가 있다면 별도 발급 없이 해당 인증서를 선택하면 됩니다.
+
+## 4단계: 공유기 포트 포워딩
+
+공유기에서 443 포트가 NAS(192.168.0.17)로 포워딩되어 있는지 확인합니다.
+
+> 기존 `haesol.gru.farm` 등이 HTTPS로 동작 중이라면 이미 설정되어 있을 가능성이 높습니다.
+
+| 외부 포트 | 내부 IP | 내부 포트 | 프로토콜 |
+|-----------|---------|-----------|----------|
+| 443 | 192.168.0.17 | 443 | TCP |
+
+## 5단계: 확인
+
+```bash
+# DNS 전파 확인
+dig +short cliproxy.gru.farm
+# 125.188.185.74 가 나오면 성공
+
+# HTTPS 접속 테스트
+curl https://cliproxy.gru.farm/
+# {"endpoints":[...],"message":"CLI Proxy API Server"}
+
+# 모델 목록 확인
+curl -H "Authorization: Bearer Jinie4eva!" https://cliproxy.gru.farm/v1/models
+```
+
+## 클라이언트 연결 (외부)
+
+```bash
+# Claude Code
+export ANTHROPIC_BASE_URL=https://cliproxy.gru.farm
+export ANTHROPIC_API_KEY=Jinie4eva!
+
+# OpenAI 호환
+export OPENAI_BASE_URL=https://cliproxy.gru.farm/v1
+export OPENAI_API_KEY=Jinie4eva!
+```

internal/api/modules/amp/fallback_handlers.go

@@ -123,6 +123,10 @@ func (fh *FallbackHandler) WrapHandler(handler gin.HandlerFunc) gin.HandlerFunc
 			return
 		}
 
+		// Sanitize request body: remove thinking blocks with invalid signatures
+		// to prevent upstream API 400 errors
+		bodyBytes = SanitizeAmpRequestBody(bodyBytes)
+
 		// Restore the body for the handler to read
 		c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))
 
@@ -259,10 +263,16 @@ func (fh *FallbackHandler) WrapHandler(handler gin.HandlerFunc) gin.HandlerFunc
 		} else if len(providers) > 0 {
 			// Log: Using local provider (free)
 			logAmpRouting(RouteTypeLocalProvider, modelName, resolvedModel, providerName, requestPath)
+			// Wrap with ResponseRewriter for local providers too, because upstream
+			// proxies (e.g. NewAPI) may return a different model name and lack
+			// Amp-required fields like thinking.signature.
+			rewriter := NewResponseRewriter(c.Writer, modelName)
+			c.Writer = rewriter
 			// Filter Anthropic-Beta header only for local handling paths
 			filterAntropicBetaHeader(c)
 			c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))
 			handler(c)
+			rewriter.Flush()
 		} else {
 			// No provider, no mapping, no proxy: fall back to the wrapped handler so it can return an error response
 			c.Request.Body = io.NopCloser(bytes.NewReader(bodyBytes))

internal/api/modules/amp/response_rewriter.go

@@ -2,6 +2,7 @@ package amp
 
 import (
 	"bytes"
+	"fmt"
 	"net/http"
 	"strings"
 
@@ -12,32 +13,83 @@ import (
 )
 
 // ResponseRewriter wraps a gin.ResponseWriter to intercept and modify the response body
-// It's used to rewrite model names in responses when model mapping is used
+// It is used to rewrite model names in responses when model mapping is used
+// and to keep Amp-compatible response shapes.
 type ResponseRewriter struct {
 	gin.ResponseWriter
 	body                   *bytes.Buffer
 	originalModel          string
 	isStreaming            bool
+	suppressedContentBlock map[int]struct{}
 }
 
-// NewResponseRewriter creates a new response rewriter for model name substitution
+// NewResponseRewriter creates a new response rewriter for model name substitution.
 func NewResponseRewriter(w gin.ResponseWriter, originalModel string) *ResponseRewriter {
 	return &ResponseRewriter{
 		ResponseWriter:         w,
 		body:                   &bytes.Buffer{},
 		originalModel:          originalModel,
+		suppressedContentBlock: make(map[int]struct{}),
 	}
 }
 
-// Write intercepts response writes and buffers them for model name replacement
+const maxBufferedResponseBytes = 2 * 1024 * 1024 // 2MB safety cap
+
+func looksLikeSSEChunk(data []byte) bool {
+	for _, line := range bytes.Split(data, []byte("\n")) {
+		trimmed := bytes.TrimSpace(line)
+		if bytes.HasPrefix(trimmed, []byte("data:")) ||
+			bytes.HasPrefix(trimmed, []byte("event:")) {
+			return true
+		}
+	}
+	return false
+}
+
+func (rw *ResponseRewriter) enableStreaming(reason string) error {
+	if rw.isStreaming {
+		return nil
+	}
+	rw.isStreaming = true
+
+	if rw.body != nil && rw.body.Len() > 0 {
+		buf := rw.body.Bytes()
+		toFlush := make([]byte, len(buf))
+		copy(toFlush, buf)
+		rw.body.Reset()
+
+		if _, err := rw.ResponseWriter.Write(rw.rewriteStreamChunk(toFlush)); err != nil {
+			return err
+		}
+		if flusher, ok := rw.ResponseWriter.(http.Flusher); ok {
+			flusher.Flush()
+		}
+	}
+
+	log.Debugf("amp response rewriter: switched to streaming (%s)", reason)
+	return nil
+}
+
 func (rw *ResponseRewriter) Write(data []byte) (int, error) {
-	// Detect streaming on first write
+	if !rw.isStreaming && rw.body.Len() == 0 {
-	if rw.body.Len() == 0 && !rw.isStreaming {
 		contentType := rw.Header().Get("Content-Type")
 		rw.isStreaming = strings.Contains(contentType, "text/event-stream") ||
 			strings.Contains(contentType, "stream")
 	}
 
+	if !rw.isStreaming {
+		if looksLikeSSEChunk(data) {
+			if err := rw.enableStreaming("sse heuristic"); err != nil {
+				return 0, err
+			}
+		} else if rw.body.Len()+len(data) > maxBufferedResponseBytes {
+			log.Warnf("amp response rewriter: buffer exceeded %d bytes, switching to streaming", maxBufferedResponseBytes)
+			if err := rw.enableStreaming("buffer limit"); err != nil {
+				return 0, err
+			}
+		}
+	}
+
 	if rw.isStreaming {
 		n, err := rw.ResponseWriter.Write(rw.rewriteStreamChunk(data))
 		if err == nil {
@@ -50,7 +102,6 @@ func (rw *ResponseRewriter) Write(data []byte) (int, error) {
 	return rw.body.Write(data)
 }
 
-// Flush writes the buffered response with model names rewritten
 func (rw *ResponseRewriter) Flush() {
 	if rw.isStreaming {
 		if flusher, ok := rw.ResponseWriter.(http.Flusher); ok {
@@ -59,26 +110,68 @@ func (rw *ResponseRewriter) Flush() {
 		return
 	}
 	if rw.body.Len() > 0 {
-		if _, err := rw.ResponseWriter.Write(rw.rewriteModelInResponse(rw.body.Bytes())); err != nil {
+		rewritten := rw.rewriteModelInResponse(rw.body.Bytes())
+		// Update Content-Length to match the rewritten body size, since
+		// signature injection and model name changes alter the payload length.
+		rw.ResponseWriter.Header().Set("Content-Length", fmt.Sprintf("%d", len(rewritten)))
+		if _, err := rw.ResponseWriter.Write(rewritten); err != nil {
 			log.Warnf("amp response rewriter: failed to write rewritten response: %v", err)
 		}
 	}
 }
 
-// modelFieldPaths lists all JSON paths where model name may appear
 var modelFieldPaths = []string{"message.model", "model", "modelVersion", "response.model", "response.modelVersion"}
 
-// rewriteModelInResponse replaces all occurrences of the mapped model with the original model in JSON
+// ensureAmpSignature injects empty signature fields into tool_use/thinking blocks
-// It also suppresses "thinking" blocks if "tool_use" is present to ensure Amp client compatibility
+// in API responses so that the Amp TUI does not crash on P.signature.length.
-func (rw *ResponseRewriter) rewriteModelInResponse(data []byte) []byte {
+func ensureAmpSignature(data []byte) []byte {
-	// 1. Amp Compatibility: Suppress thinking blocks if tool use is detected
+	for index, block := range gjson.GetBytes(data, "content").Array() {
-	// The Amp client struggles when both thinking and tool_use blocks are present
+		blockType := block.Get("type").String()
+		if blockType != "tool_use" && blockType != "thinking" {
+			continue
+		}
+		signaturePath := fmt.Sprintf("content.%d.signature", index)
+		if gjson.GetBytes(data, signaturePath).Exists() {
+			continue
+		}
+		var err error
+		data, err = sjson.SetBytes(data, signaturePath, "")
+		if err != nil {
+			log.Warnf("Amp ResponseRewriter: failed to add empty signature to %s block: %v", blockType, err)
+			break
+		}
+	}
+
+	contentBlockType := gjson.GetBytes(data, "content_block.type").String()
+	if (contentBlockType == "tool_use" || contentBlockType == "thinking") && !gjson.GetBytes(data, "content_block.signature").Exists() {
+		var err error
+		data, err = sjson.SetBytes(data, "content_block.signature", "")
+		if err != nil {
+			log.Warnf("Amp ResponseRewriter: failed to add empty signature to streaming %s block: %v", contentBlockType, err)
+		}
+	}
+
+	return data
+}
+
+func (rw *ResponseRewriter) markSuppressedContentBlock(index int) {
+	if rw.suppressedContentBlock == nil {
+		rw.suppressedContentBlock = make(map[int]struct{})
+	}
+	rw.suppressedContentBlock[index] = struct{}{}
+}
+
+func (rw *ResponseRewriter) isSuppressedContentBlock(index int) bool {
+	_, ok := rw.suppressedContentBlock[index]
+	return ok
+}
+
+func (rw *ResponseRewriter) suppressAmpThinking(data []byte) []byte {
 	if gjson.GetBytes(data, `content.#(type=="tool_use")`).Exists() {
 		filtered := gjson.GetBytes(data, `content.#(type!="thinking")#`)
 		if filtered.Exists() {
 			originalCount := gjson.GetBytes(data, "content.#").Int()
 			filteredCount := filtered.Get("#").Int()
-
 			if originalCount > filteredCount {
 				var err error
 				data, err = sjson.SetBytes(data, "content", filtered.Value())
@@ -86,13 +179,41 @@ func (rw *ResponseRewriter) rewriteModelInResponse(data []byte) []byte {
 					log.Warnf("Amp ResponseRewriter: failed to suppress thinking blocks: %v", err)
 				} else {
 					log.Debugf("Amp ResponseRewriter: Suppressed %d thinking blocks due to tool usage", originalCount-filteredCount)
-					// Log the result for verification
-					log.Debugf("Amp ResponseRewriter: Resulting content: %s", gjson.GetBytes(data, "content").String())
 				}
 			}
 		}
 	}
 
+	eventType := gjson.GetBytes(data, "type").String()
+	indexResult := gjson.GetBytes(data, "index")
+	if eventType == "content_block_start" && gjson.GetBytes(data, "content_block.type").String() == "thinking" && indexResult.Exists() {
+		rw.markSuppressedContentBlock(int(indexResult.Int()))
+		return nil
+	}
+	if gjson.GetBytes(data, "delta.type").String() == "thinking_delta" {
+		if indexResult.Exists() {
+			rw.markSuppressedContentBlock(int(indexResult.Int()))
+		}
+		return nil
+	}
+	if eventType == "content_block_stop" && indexResult.Exists() {
+		index := int(indexResult.Int())
+		if rw.isSuppressedContentBlock(index) {
+			delete(rw.suppressedContentBlock, index)
+			return nil
+		}
+	}
+
+	return data
+}
+
+func (rw *ResponseRewriter) rewriteModelInResponse(data []byte) []byte {
+	data = ensureAmpSignature(data)
+	data = rw.suppressAmpThinking(data)
+	if len(data) == 0 {
+		return data
+	}
+
 	if rw.originalModel == "" {
 		return data
 	}
@@ -104,24 +225,158 @@ func (rw *ResponseRewriter) rewriteModelInResponse(data []byte) []byte {
 	return data
 }
 
-// rewriteStreamChunk rewrites model names in SSE stream chunks
 func (rw *ResponseRewriter) rewriteStreamChunk(chunk []byte) []byte {
-	if rw.originalModel == "" {
-		return chunk
-	}
-
-	// SSE format: "data: {json}\n\n"
 	lines := bytes.Split(chunk, []byte("\n"))
-	for i, line := range lines {
+	var out [][]byte
-		if bytes.HasPrefix(line, []byte("data: ")) {
+
-			jsonData := bytes.TrimPrefix(line, []byte("data: "))
+	i := 0
+	for i < len(lines) {
+		line := lines[i]
+		trimmed := bytes.TrimSpace(line)
+
+		// Case 1: "event:" line - look ahead for its "data:" line
+		if bytes.HasPrefix(trimmed, []byte("event: ")) {
+			// Scan forward past blank lines to find the data: line
+			dataIdx := -1
+			for j := i + 1; j < len(lines); j++ {
+				t := bytes.TrimSpace(lines[j])
+				if len(t) == 0 {
+					continue
+				}
+				if bytes.HasPrefix(t, []byte("data: ")) {
+					dataIdx = j
+				}
+				break
+			}
+
+			if dataIdx >= 0 {
+				// Found event+data pair - process through rewriter
+				jsonData := bytes.TrimPrefix(bytes.TrimSpace(lines[dataIdx]), []byte("data: "))
 				if len(jsonData) > 0 && jsonData[0] == '{' {
-				// Rewrite JSON in the data line
+					rewritten := rw.rewriteStreamEvent(jsonData)
-				rewritten := rw.rewriteModelInResponse(jsonData)
+					if rewritten == nil {
-				lines[i] = append([]byte("data: "), rewritten...)
+						// Event suppressed (e.g. thinking block), skip event+data pair
+						i = dataIdx + 1
+						continue
+					}
+					// Emit event line
+					out = append(out, line)
+					// Emit blank lines between event and data
+					for k := i + 1; k < dataIdx; k++ {
+						out = append(out, lines[k])
+					}
+					// Emit rewritten data
+					out = append(out, append([]byte("data: "), rewritten...))
+					i = dataIdx + 1
+					continue
+				}
+			}
+
+			// No data line found (orphan event from cross-chunk split)
+			// Pass it through as-is - the data will arrive in the next chunk
+			out = append(out, line)
+			i++
+			continue
+		}
+
+		// Case 2: standalone "data:" line (no preceding event: in this chunk)
+		if bytes.HasPrefix(trimmed, []byte("data: ")) {
+			jsonData := bytes.TrimPrefix(trimmed, []byte("data: "))
+			if len(jsonData) > 0 && jsonData[0] == '{' {
+				rewritten := rw.rewriteStreamEvent(jsonData)
+				if rewritten != nil {
+					out = append(out, append([]byte("data: "), rewritten...))
+				}
+				i++
+				continue
+			}
+		}
+
+		// Case 3: everything else
+		out = append(out, line)
+		i++
+	}
+
+	return bytes.Join(out, []byte("\n"))
+}
+
+// rewriteStreamEvent processes a single JSON event in the SSE stream.
+// It rewrites model names and ensures signature fields exist.
+func (rw *ResponseRewriter) rewriteStreamEvent(data []byte) []byte {
+	// Suppress thinking blocks before any other processing.
+	data = rw.suppressAmpThinking(data)
+	if len(data) == 0 {
+		return nil
+	}
+
+	// Inject empty signature where needed
+	data = ensureAmpSignature(data)
+
+	// Rewrite model name
+	if rw.originalModel != "" {
+		for _, path := range modelFieldPaths {
+			if gjson.GetBytes(data, path).Exists() {
+				data, _ = sjson.SetBytes(data, path, rw.originalModel)
 			}
 		}
 	}
 
-	return bytes.Join(lines, []byte("\n"))
+	return data
+}
+
+// SanitizeAmpRequestBody removes thinking blocks with empty/missing/invalid signatures
+// from the messages array in a request body before forwarding to the upstream API.
+// This prevents 400 errors from the API which requires valid signatures on thinking blocks.
+func SanitizeAmpRequestBody(body []byte) []byte {
+	messages := gjson.GetBytes(body, "messages")
+	if !messages.Exists() || !messages.IsArray() {
+		return body
+	}
+
+	modified := false
+	for msgIdx, msg := range messages.Array() {
+		if msg.Get("role").String() != "assistant" {
+			continue
+		}
+		content := msg.Get("content")
+		if !content.Exists() || !content.IsArray() {
+			continue
+		}
+
+		var keepBlocks []interface{}
+		removedCount := 0
+
+		for _, block := range content.Array() {
+			blockType := block.Get("type").String()
+			if blockType == "thinking" {
+				sig := block.Get("signature")
+				if !sig.Exists() || sig.Type != gjson.String || strings.TrimSpace(sig.String()) == "" {
+					removedCount++
+					continue
+				}
+			}
+			keepBlocks = append(keepBlocks, block.Value())
+		}
+
+		if removedCount > 0 {
+			contentPath := fmt.Sprintf("messages.%d.content", msgIdx)
+			var err error
+			if len(keepBlocks) == 0 {
+				body, err = sjson.SetBytes(body, contentPath, []interface{}{})
+			} else {
+				body, err = sjson.SetBytes(body, contentPath, keepBlocks)
+			}
+			if err != nil {
+				log.Warnf("Amp RequestSanitizer: failed to remove thinking blocks from message %d: %v", msgIdx, err)
+				continue
+			}
+			modified = true
+			log.Debugf("Amp RequestSanitizer: removed %d thinking blocks with invalid signatures from message %d", removedCount, msgIdx)
+		}
+	}
+
+	if modified {
+		log.Debugf("Amp RequestSanitizer: sanitized request body")
+	}
+	return body
 }

internal/api/modules/amp/response_rewriter_test.go

@@ -100,6 +100,44 @@ func TestRewriteStreamChunk_MessageModel(t *testing.T) {
 	}
 }
 
+func TestRewriteStreamChunk_SuppressesThinkingContentBlockFrames(t *testing.T) {
+	rw := &ResponseRewriter{suppressedContentBlock: make(map[int]struct{})}
+
+	chunk := []byte("event: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"thinking\",\"thinking\":\"\"}}\n\nevent: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"thinking_delta\",\"thinking\":\"abc\"}}\n\nevent: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\nevent: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":1,\"content_block\":{\"type\":\"tool_use\",\"name\":\"bash\",\"input\":{}}}\n\n")
+	result := rw.rewriteStreamChunk(chunk)
+
+	if contains(result, []byte("\"thinking\"")) || contains(result, []byte("\"thinking_delta\"")) {
+		t.Fatalf("expected thinking content_block frames to be suppressed, got %s", string(result))
+	}
+	if contains(result, []byte("content_block_stop")) {
+		t.Fatalf("expected suppressed thinking content_block_stop to be removed, got %s", string(result))
+	}
+	if !contains(result, []byte("\"tool_use\"")) {
+		t.Fatalf("expected tool_use content_block frame to remain, got %s", string(result))
+	}
+	if !contains(result, []byte("\"signature\":\"\"")) {
+		t.Fatalf("expected tool_use content_block signature injection, got %s", string(result))
+	}
+}
+
+func TestSanitizeAmpRequestBody_RemovesWhitespaceAndNonStringSignatures(t *testing.T) {
+	input := []byte(`{"messages":[{"role":"assistant","content":[{"type":"thinking","thinking":"drop-whitespace","signature":"   "},{"type":"thinking","thinking":"drop-number","signature":123},{"type":"thinking","thinking":"keep-valid","signature":"valid-signature"},{"type":"text","text":"keep-text"}]}]}`)
+	result := SanitizeAmpRequestBody(input)
+
+	if contains(result, []byte("drop-whitespace")) {
+		t.Fatalf("expected whitespace-only signature block to be removed, got %s", string(result))
+	}
+	if contains(result, []byte("drop-number")) {
+		t.Fatalf("expected non-string signature block to be removed, got %s", string(result))
+	}
+	if !contains(result, []byte("keep-valid")) {
+		t.Fatalf("expected valid thinking block to remain, got %s", string(result))
+	}
+	if !contains(result, []byte("keep-text")) {
+		t.Fatalf("expected non-thinking content to remain, got %s", string(result))
+	}
+}
+
 func contains(data, substr []byte) bool {
 	for i := 0; i <= len(data)-len(substr); i++ {
 		if string(data[i:i+len(substr)]) == string(substr) {

internal/translator/antigravity/claude/antigravity_claude_request.go

@@ -330,35 +330,48 @@ func ConvertClaudeRequestToAntigravity(modelName string, inputRawJSON []byte, _
 					}
 				}
 
-				// Reorder parts for 'model' role to ensure thinking block is first
+				// Reorder parts for 'model' role:
+				// 1. Thinking parts first (Antigravity API requirement)
+				// 2. Regular parts (text, inlineData, etc.)
+				// 3. FunctionCall parts last
+				//
+				// Moving functionCall parts to the end prevents tool_use↔tool_result
+				// pairing breakage: the Antigravity API internally splits model messages
+				// at functionCall boundaries. If a text part follows a functionCall, the
+				// split creates an extra assistant turn between tool_use and tool_result,
+				// which Claude rejects with "tool_use ids were found without tool_result
+				// blocks immediately after".
 				if role == "model" {
 					partsResult := gjson.GetBytes(clientContentJSON, "parts")
 					if partsResult.IsArray() {
 						parts := partsResult.Array()
+						if len(parts) > 1 {
 							var thinkingParts []gjson.Result
-						var otherParts []gjson.Result
+							var regularParts []gjson.Result
+							var functionCallParts []gjson.Result
 							for _, part := range parts {
 								if part.Get("thought").Bool() {
 									thinkingParts = append(thinkingParts, part)
+								} else if part.Get("functionCall").Exists() {
+									functionCallParts = append(functionCallParts, part)
 								} else {
-								otherParts = append(otherParts, part)
+									regularParts = append(regularParts, part)
 								}
 							}
-						if len(thinkingParts) > 0 {
-							firstPartIsThinking := parts[0].Get("thought").Bool()
-							if !firstPartIsThinking || len(thinkingParts) > 1 {
 							var newParts []interface{}
 							for _, p := range thinkingParts {
 								newParts = append(newParts, p.Value())
 							}
-								for _, p := range otherParts {
+							for _, p := range regularParts {
+								newParts = append(newParts, p.Value())
+							}
+							for _, p := range functionCallParts {
 								newParts = append(newParts, p.Value())
 							}
 							clientContentJSON, _ = sjson.SetBytes(clientContentJSON, "parts", newParts)
 						}
 					}
 				}
-				}
 
 				// Skip messages with empty parts array to avoid Gemini API error:
 				// "required oneof field 'data' must have one initialized field"

internal/translator/antigravity/claude/antigravity_claude_request_test.go

@@ -361,6 +361,167 @@ func TestConvertClaudeRequestToAntigravity_ReorderThinking(t *testing.T) {
 	}
 }
 
+func TestConvertClaudeRequestToAntigravity_ReorderTextAfterFunctionCall(t *testing.T) {
+	// Bug: text part after tool_use in an assistant message causes Antigravity
+	// to split at functionCall boundary, creating an extra assistant turn that
+	// breaks tool_use↔tool_result adjacency (upstream issue #989).
+	// Fix: reorder parts so functionCall comes last.
+	inputJSON := []byte(`{
+		"model": "claude-sonnet-4-5",
+		"messages": [
+			{
+				"role": "assistant",
+				"content": [
+					{"type": "text", "text": "Let me check..."},
+					{
+						"type": "tool_use",
+						"id": "call_abc",
+						"name": "Read",
+						"input": {"file": "test.go"}
+					},
+					{"type": "text", "text": "Reading the file now"}
+				]
+			},
+			{
+				"role": "user",
+				"content": [
+					{
+						"type": "tool_result",
+						"tool_use_id": "call_abc",
+						"content": "file content"
+					}
+				]
+			}
+		]
+	}`)
+
+	output := ConvertClaudeRequestToAntigravity("claude-sonnet-4-5", inputJSON, false)
+	outputStr := string(output)
+
+	parts := gjson.Get(outputStr, "request.contents.0.parts").Array()
+	if len(parts) != 3 {
+		t.Fatalf("Expected 3 parts, got %d", len(parts))
+	}
+
+	// Text parts should come before functionCall
+	if parts[0].Get("text").String() != "Let me check..." {
+		t.Errorf("Expected first text part first, got %s", parts[0].Raw)
+	}
+	if parts[1].Get("text").String() != "Reading the file now" {
+		t.Errorf("Expected second text part second, got %s", parts[1].Raw)
+	}
+	if !parts[2].Get("functionCall").Exists() {
+		t.Errorf("Expected functionCall last, got %s", parts[2].Raw)
+	}
+	if parts[2].Get("functionCall.name").String() != "Read" {
+		t.Errorf("Expected functionCall name 'Read', got '%s'", parts[2].Get("functionCall.name").String())
+	}
+}
+
+func TestConvertClaudeRequestToAntigravity_ReorderParallelFunctionCalls(t *testing.T) {
+	inputJSON := []byte(`{
+		"model": "claude-sonnet-4-5",
+		"messages": [
+			{
+				"role": "assistant",
+				"content": [
+					{"type": "text", "text": "Reading both files."},
+					{
+						"type": "tool_use",
+						"id": "call_1",
+						"name": "Read",
+						"input": {"file": "a.go"}
+					},
+					{"type": "text", "text": "And this one too."},
+					{
+						"type": "tool_use",
+						"id": "call_2",
+						"name": "Read",
+						"input": {"file": "b.go"}
+					}
+				]
+			}
+		]
+	}`)
+
+	output := ConvertClaudeRequestToAntigravity("claude-sonnet-4-5", inputJSON, false)
+	outputStr := string(output)
+
+	parts := gjson.Get(outputStr, "request.contents.0.parts").Array()
+	if len(parts) != 4 {
+		t.Fatalf("Expected 4 parts, got %d", len(parts))
+	}
+
+	if parts[0].Get("text").String() != "Reading both files." {
+		t.Errorf("Expected first text, got %s", parts[0].Raw)
+	}
+	if parts[1].Get("text").String() != "And this one too." {
+		t.Errorf("Expected second text, got %s", parts[1].Raw)
+	}
+	if parts[2].Get("functionCall.name").String() != "Read" || parts[2].Get("functionCall.id").String() != "call_1" {
+		t.Errorf("Expected fc1 third, got %s", parts[2].Raw)
+	}
+	if parts[3].Get("functionCall.name").String() != "Read" || parts[3].Get("functionCall.id").String() != "call_2" {
+		t.Errorf("Expected fc2 fourth, got %s", parts[3].Raw)
+	}
+}
+
+func TestConvertClaudeRequestToAntigravity_ReorderThinkingAndTextBeforeFunctionCall(t *testing.T) {
+	cache.ClearSignatureCache("")
+
+	validSignature := "abc123validSignature1234567890123456789012345678901234567890"
+	thinkingText := "Let me think about this..."
+
+	inputJSON := []byte(`{
+		"model": "claude-sonnet-4-5-thinking",
+		"messages": [
+			{
+				"role": "user",
+				"content": [{"type": "text", "text": "Hello"}]
+			},
+			{
+				"role": "assistant",
+				"content": [
+					{"type": "text", "text": "Before thinking"},
+					{"type": "thinking", "thinking": "` + thinkingText + `", "signature": "` + validSignature + `"},
+					{
+						"type": "tool_use",
+						"id": "call_xyz",
+						"name": "Bash",
+						"input": {"command": "ls"}
+					},
+					{"type": "text", "text": "After tool call"}
+				]
+			}
+		]
+	}`)
+
+	cache.CacheSignature("claude-sonnet-4-5-thinking", thinkingText, validSignature)
+
+	output := ConvertClaudeRequestToAntigravity("claude-sonnet-4-5-thinking", inputJSON, false)
+	outputStr := string(output)
+
+	// contents.1 = assistant message (contents.0 = user)
+	parts := gjson.Get(outputStr, "request.contents.1.parts").Array()
+	if len(parts) != 4 {
+		t.Fatalf("Expected 4 parts, got %d", len(parts))
+	}
+
+	// Order: thinking → text → text → functionCall
+	if !parts[0].Get("thought").Bool() {
+		t.Error("First part should be thinking")
+	}
+	if parts[1].Get("functionCall").Exists() || parts[1].Get("thought").Bool() {
+		t.Errorf("Second part should be text, got %s", parts[1].Raw)
+	}
+	if parts[2].Get("functionCall").Exists() || parts[2].Get("thought").Bool() {
+		t.Errorf("Third part should be text, got %s", parts[2].Raw)
+	}
+	if !parts[3].Get("functionCall").Exists() {
+		t.Errorf("Last part should be functionCall, got %s", parts[3].Raw)
+	}
+}
+
 func TestConvertClaudeRequestToAntigravity_ToolResult(t *testing.T) {
 	inputJSON := []byte(`{
 		"model": "claude-3-5-sonnet-20240620",

sdk/cliproxy/auth/conductor.go

@@ -1734,6 +1734,7 @@ func (m *Manager) MarkResult(ctx context.Context, result Result) {
 			}
 		} else {
 			if result.Model != "" {
+				if !isRequestScopedNotFoundResultError(result.Error) {
 					state := ensureModelState(auth, result.Model)
 					state.Unavailable = true
 					state.Status = StatusError
@@ -1805,6 +1806,7 @@ func (m *Manager) MarkResult(ctx context.Context, result Result) {
 					auth.Status = StatusError
 					auth.UpdatedAt = now
 					updateAggregatedAvailability(auth, now)
+				}
 			} else {
 				applyAuthFailureState(auth, result.Error, result.RetryAfter, now)
 			}
@@ -2056,11 +2058,29 @@ func isModelSupportResultError(err *Error) bool {
 	return isModelSupportErrorMessage(err.Message)
 }
 
+func isRequestScopedNotFoundMessage(message string) bool {
+	if message == "" {
+		return false
+	}
+	lower := strings.ToLower(message)
+	return strings.Contains(lower, "item with id") &&
+		strings.Contains(lower, "not found") &&
+		strings.Contains(lower, "items are not persisted when `store` is set to false")
+}
+
+func isRequestScopedNotFoundResultError(err *Error) bool {
+	if err == nil || statusCodeFromResult(err) != http.StatusNotFound {
+		return false
+	}
+	return isRequestScopedNotFoundMessage(err.Message)
+}
+
 // isRequestInvalidError returns true if the error represents a client request
 // error that should not be retried. Specifically, it treats 400 responses with
-// "invalid_request_error" and all 422 responses as request-shape failures,
+// "invalid_request_error", request-scoped 404 item misses caused by `store=false`,
-// where switching auths or pooled upstream models will not help. Model-support
+// and all 422 responses as request-shape failures, where switching auths or
-// errors are excluded so routing can fall through to another auth or upstream.
+// pooled upstream models will not help. Model-support errors are excluded so
+// routing can fall through to another auth or upstream.
 func isRequestInvalidError(err error) bool {
 	if err == nil {
 		return false
@@ -2072,6 +2092,8 @@ func isRequestInvalidError(err error) bool {
 	switch status {
 	case http.StatusBadRequest:
 		return strings.Contains(err.Error(), "invalid_request_error")
+	case http.StatusNotFound:
+		return isRequestScopedNotFoundMessage(err.Error())
 	case http.StatusUnprocessableEntity:
 		return true
 	default:
@@ -2083,6 +2105,9 @@ func applyAuthFailureState(auth *Auth, resultErr *Error, retryAfter *time.Durati
 	if auth == nil {
 		return
 	}
+	if isRequestScopedNotFoundResultError(resultErr) {
+		return
+	}
 	auth.Unavailable = true
 	auth.Status = StatusError
 	auth.UpdatedAt = now

sdk/cliproxy/auth/conductor_overrides_test.go

@@ -12,6 +12,8 @@ import (
 	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"
 )
 
+const requestScopedNotFoundMessage = "Item with id 'rs_0b5f3eb6f51f175c0169ca74e4a85881998539920821603a74' not found. Items are not persisted when `store` is set to false. Try again with `store` set to true, or remove this item from your input."
+
 func TestManager_ShouldRetryAfterError_RespectsAuthRequestRetryOverride(t *testing.T) {
 	m := NewManager(nil, nil, nil)
 	m.SetRetryConfig(3, 30*time.Second, 0)
@@ -447,3 +449,114 @@ func TestManager_MarkResult_RespectsAuthDisableCoolingOverride(t *testing.T) {
 		t.Fatalf("expected NextRetryAfter to be zero when disable_cooling=true, got %v", state.NextRetryAfter)
 	}
 }
+
+func TestManager_MarkResult_RequestScopedNotFoundDoesNotCooldownAuth(t *testing.T) {
+	m := NewManager(nil, nil, nil)
+
+	auth := &Auth{
+		ID:       "auth-1",
+		Provider: "openai",
+	}
+	if _, errRegister := m.Register(context.Background(), auth); errRegister != nil {
+		t.Fatalf("register auth: %v", errRegister)
+	}
+
+	model := "gpt-4.1"
+	m.MarkResult(context.Background(), Result{
+		AuthID:   auth.ID,
+		Provider: auth.Provider,
+		Model:    model,
+		Success:  false,
+		Error: &Error{
+			HTTPStatus: http.StatusNotFound,
+			Message:    requestScopedNotFoundMessage,
+		},
+	})
+
+	updated, ok := m.GetByID(auth.ID)
+	if !ok || updated == nil {
+		t.Fatalf("expected auth to be present")
+	}
+	if updated.Unavailable {
+		t.Fatalf("expected request-scoped 404 to keep auth available")
+	}
+	if !updated.NextRetryAfter.IsZero() {
+		t.Fatalf("expected request-scoped 404 to keep auth cooldown unset, got %v", updated.NextRetryAfter)
+	}
+	if state := updated.ModelStates[model]; state != nil {
+		t.Fatalf("expected request-scoped 404 to avoid model cooldown state, got %#v", state)
+	}
+}
+
+func TestManager_RequestScopedNotFoundStopsRetryWithoutSuspendingAuth(t *testing.T) {
+	m := NewManager(nil, nil, nil)
+	executor := &authFallbackExecutor{
+		id: "openai",
+		executeErrors: map[string]error{
+			"aa-bad-auth": &Error{
+				HTTPStatus: http.StatusNotFound,
+				Message:    requestScopedNotFoundMessage,
+			},
+		},
+	}
+	m.RegisterExecutor(executor)
+
+	model := "gpt-4.1"
+	badAuth := &Auth{ID: "aa-bad-auth", Provider: "openai"}
+	goodAuth := &Auth{ID: "bb-good-auth", Provider: "openai"}
+
+	reg := registry.GetGlobalRegistry()
+	reg.RegisterClient(badAuth.ID, "openai", []*registry.ModelInfo{{ID: model}})
+	reg.RegisterClient(goodAuth.ID, "openai", []*registry.ModelInfo{{ID: model}})
+	t.Cleanup(func() {
+		reg.UnregisterClient(badAuth.ID)
+		reg.UnregisterClient(goodAuth.ID)
+	})
+
+	if _, errRegister := m.Register(context.Background(), badAuth); errRegister != nil {
+		t.Fatalf("register bad auth: %v", errRegister)
+	}
+	if _, errRegister := m.Register(context.Background(), goodAuth); errRegister != nil {
+		t.Fatalf("register good auth: %v", errRegister)
+	}
+
+	_, errExecute := m.Execute(context.Background(), []string{"openai"}, cliproxyexecutor.Request{Model: model}, cliproxyexecutor.Options{})
+	if errExecute == nil {
+		t.Fatal("expected request-scoped not-found error")
+	}
+	errResult, ok := errExecute.(*Error)
+	if !ok {
+		t.Fatalf("expected *Error, got %T", errExecute)
+	}
+	if errResult.HTTPStatus != http.StatusNotFound {
+		t.Fatalf("status = %d, want %d", errResult.HTTPStatus, http.StatusNotFound)
+	}
+	if errResult.Message != requestScopedNotFoundMessage {
+		t.Fatalf("message = %q, want %q", errResult.Message, requestScopedNotFoundMessage)
+	}
+
+	got := executor.ExecuteCalls()
+	want := []string{badAuth.ID}
+	if len(got) != len(want) {
+		t.Fatalf("execute calls = %v, want %v", got, want)
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("execute call %d auth = %q, want %q", i, got[i], want[i])
+		}
+	}
+
+	updatedBad, ok := m.GetByID(badAuth.ID)
+	if !ok || updatedBad == nil {
+		t.Fatalf("expected bad auth to remain registered")
+	}
+	if updatedBad.Unavailable {
+		t.Fatalf("expected request-scoped 404 to keep bad auth available")
+	}
+	if !updatedBad.NextRetryAfter.IsZero() {
+		t.Fatalf("expected request-scoped 404 to keep bad auth cooldown unset, got %v", updatedBad.NextRetryAfter)
+	}
+	if state := updatedBad.ModelStates[model]; state != nil {
+		t.Fatalf("expected request-scoped 404 to avoid bad auth model cooldown state, got %#v", state)
+	}
+}