diff --git a/apps/admin-web/src/api/adminApiTypes.ts b/apps/admin-web/src/api/adminApiTypes.ts
index c3a9e7256..1f7ffeec2 100644
--- a/apps/admin-web/src/api/adminApiTypes.ts
+++ b/apps/admin-web/src/api/adminApiTypes.ts
@@ -1075,7 +1075,11 @@ export interface AdminRechargeRefundActionResponse {
 export interface AdminWalletRestrictionResponse {
   wallet: AdminProfileWalletPayload;
 }
-export type AdminAgcAgentMode = 'codex' | 'cc' | 'anthropic';
+export type AdminAgcAgentMode = 'codex' | 'cc';
+export type AdminAgcModelProtocol =
+  | 'openai_responses'
+  | 'openai_chat'
+  | 'anthropic';
 
 export interface AdminAgcModel {
   id: string;
@@ -1083,6 +1087,8 @@ export interface AdminAgcModel {
   modelId: string;
   enabled: boolean;
   agentMode: AdminAgcAgentMode;
+  /** 上游线协议，与执行器正交。 */
+  protocol?: AdminAgcModelProtocol;
 }
 
 export interface AdminAgcModelCatalog {
diff --git a/apps/admin-web/src/pages/AdminAgcModelsPage.test.tsx b/apps/admin-web/src/pages/AdminAgcModelsPage.test.tsx
index 77b9262bb..612d21826 100644
--- a/apps/admin-web/src/pages/AdminAgcModelsPage.test.tsx
+++ b/apps/admin-web/src/pages/AdminAgcModelsPage.test.tsx
@@ -104,3 +104,49 @@ test('new models default to Codex and save the selected Agent mode', async () =>
     });
   });
 });
+
+test('协议与 Agent 模式是独立字段，可按模型单独选择', async () => {
+  const catalog = {
+    revision: 3,
+    defaultModelId: 'quality',
+    models: [
+      {
+        id: 'quality',
+        alias: '高质量',
+        modelId: 'claude-opus-5-5',
+        enabled: true,
+        agentMode: 'cc' as const,
+        protocol: 'anthropic' as const,
+      },
+    ],
+  };
+  vi.mocked(getAgcModelCatalog).mockResolvedValue(catalog);
+  vi.mocked(saveAgcModelCatalog).mockImplementation(async (_, input) => ({
+    ...input,
+    revision: 4,
+  }));
+  render(<AdminAgcModelsPage token="test" onUnauthorized={vi.fn()} />);
+  await screen.findByDisplayValue('claude-opus-5-5');
+
+  const agentMode = screen.getByLabelText('模型 1 Agent 模式') as HTMLSelectElement;
+  const protocol = screen.getByLabelText('模型 1 协议') as HTMLSelectElement;
+  expect(agentMode.value).toBe('cc');
+  expect(protocol.value).toBe('anthropic');
+  // 执行器下拉里不再混入协议取值。
+  expect(
+    Array.from(agentMode.options).map((option) => option.value),
+  ).toEqual(['codex', 'cc']);
+
+  fireEvent.change(agentMode, { target: { value: 'codex' } });
+  fireEvent.change(protocol, { target: { value: 'openai_chat' } });
+  fireEvent.click(screen.getByRole('button', { name: '保存' }));
+
+  await waitFor(() => {
+    const calls = vi.mocked(saveAgcModelCatalog).mock.calls;
+    const payload = calls[calls.length - 1]?.[1];
+    expect(payload?.models[0]).toMatchObject({
+      agentMode: 'codex',
+      protocol: 'openai_chat',
+    });
+  });
+});
diff --git a/apps/admin-web/src/pages/AdminAgcModelsPage.tsx b/apps/admin-web/src/pages/AdminAgcModelsPage.tsx
index cab805cf7..b009aa222 100644
--- a/apps/admin-web/src/pages/AdminAgcModelsPage.tsx
+++ b/apps/admin-web/src/pages/AdminAgcModelsPage.tsx
@@ -117,6 +117,7 @@ export function AdminAgcModelsPage({
           { key: 'alias', label: '别名' },
           { key: 'modelId', label: '实际模型名' },
           { key: 'agentMode', label: 'Agent 模式' },
+          { key: 'protocol', label: '协议' },
           { key: 'enabled', label: '启用' },
           { key: 'default', label: '默认' },
           { key: 'actions', label: '操作' },
@@ -157,6 +158,7 @@ export function AdminAgcModelsPage({
                             modelId: '',
                             enabled: true,
                             agentMode: 'codex',
+                            protocol: 'openai_responses',
                           },
                         ],
                       },
@@ -226,7 +228,22 @@ export function AdminAgcModelsPage({
                 >
                   <option value="codex">Codex</option>
                   <option value="cc">Claude Code</option>
-                  <option value="anthropic">Anthropic 协议</option>
+                </select>
+              </td>
+              <td>
+                <select
+                  aria-label={`模型 ${index + 1} 协议`}
+                  value={model.protocol ?? 'openai_responses'}
+                  disabled={busy}
+                  onChange={(e) =>
+                    update(model.id, {
+                      protocol: e.target.value as AdminAgcModel['protocol'],
+                    })
+                  }
+                >
+                  <option value="openai_responses">OpenAI Responses</option>
+                  <option value="openai_chat">OpenAI Chat Completions</option>
+                  <option value="anthropic">Anthropic Messages</option>
                 </select>
               </td>
               <td>
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/mod.rs
index d81e102aa..3abf9ef84 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server/mod.rs
@@ -1971,6 +1971,28 @@ fn configure_game_creator_codex_app_server_command(
     )
 }
 
+/// Codex 的 `wire_api` 取自所选模型的线协议。
+///
+/// 单测不读全局配置：用例里没有真实的模型选择，读它会引入环境依赖，所以测试态固定
+/// `responses`，真实构建按 `selected_model_protocol` 在 `responses` / `chat` 间切换。
+fn game_creator_codex_provider_wire_api() -> &'static str {
+    #[cfg(test)]
+    {
+        "responses"
+    }
+    #[cfg(not(test))]
+    {
+        match crate::config::load_game_creator_app_config()
+            .ok()
+            .and_then(|config| config.selected_model_protocol)
+            .as_deref()
+        {
+            Some("openai_chat") => "chat",
+            _ => "responses",
+        }
+    }
+}
+
 fn configure_game_creator_codex_app_server_command_for_mode(
     command: &mut tokio::process::Command,
     llm: &GameCreatorLlmConfig,
@@ -2127,6 +2149,9 @@ fn configure_game_creator_codex_app_server_command_for_mode(
         let provider_token = provider_proxy
             .map(CodexProviderProxy::downstream_bearer_token)
             .unwrap_or(legacy_api_key);
+        // 线协议由所选模型的 `protocol` 决定：openai_chat 走 /chat/completions，
+        // 其余走 /responses。测试里不读全局配置，避免用例依赖运行环境。
+        let wire_api = game_creator_codex_provider_wire_api();
         command
             .arg("-c")
             .arg(format!(
@@ -2151,7 +2176,7 @@ fn configure_game_creator_codex_app_server_command_for_mode(
             .arg("-c")
             .arg(format!(
                 "model_providers.{GAME_CREATOR_CODEX_APP_SERVER_PROVIDER_ID}.wire_api={}",
-                quoted_toml_string("responses")?
+                quoted_toml_string(wire_api)?
             ))
             .env(GAME_CREATOR_CODEX_APP_SERVER_API_KEY_ENV, provider_token);
     }
diff --git a/apps/ai-game-creator-shell/src-tauri/src/commands.rs b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
index 9be6df9bb..565de0461 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/commands.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
@@ -1078,6 +1078,7 @@ fn select_game_creator_model_inner(
     model_id: String,
     is_default: bool,
     catalog_agent_mode: Option<String>,
+    catalog_protocol: Option<String>,
 ) -> Result<GameCreatorAppConfigView, String> {
     let _guard = GAME_CREATOR_CONFIG_WRITE_LOCK
         .lock()
@@ -1098,13 +1099,34 @@ fn select_game_creator_model_inner(
     if let Some(agent_mode) = catalog_agent_mode {
         config.agent_mode = match agent_mode.trim() {
             "codex" => GAME_CREATOR_AGENT_MODE_CODEX_APP_SERVER.to_string(),
-            // `cc` 是 Claude 执行器的历史别名，`anthropic` 是同一执行器的显式协议值。
-            "cc" | "anthropic" => GAME_CREATOR_AGENT_MODE_CLAUDE_CODE_CLI.to_string(),
+            "cc" => GAME_CREATOR_AGENT_MODE_CLAUDE_CODE_CLI.to_string(),
             value => return Err(format!("模型 Agent 模式无效：{value}")),
         };
     }
+    // 协议与执行器正交，但合法组合是封闭的；缺省按执行器推导。
+    let protocol = match catalog_protocol.as_deref().map(str::trim) {
+        Some("openai_responses") => "openai_responses",
+        Some("openai_chat") => "openai_chat",
+        Some("anthropic") => "anthropic",
+        Some("") | None => {
+            if config.agent_mode == GAME_CREATOR_AGENT_MODE_CLAUDE_CODE_CLI {
+                "anthropic"
+            } else {
+                "openai_responses"
+            }
+        }
+        Some(value) => return Err(format!("模型协议无效：{value}")),
+    };
+    let claude = config.agent_mode == GAME_CREATOR_AGENT_MODE_CLAUDE_CODE_CLI;
+    if claude != (protocol == "anthropic") {
+        return Err(format!(
+            "执行器与协议组合无效：{} 不支持 {protocol}",
+            config.agent_mode
+        ));
+    }
     config.selected_model_id = model_id;
     config.selected_model_is_default = is_default;
+    config.selected_model_protocol = Some(protocol.to_string());
     persist_game_creator_app_config(config, overlays, true)
 }
 
@@ -1113,8 +1135,9 @@ pub(crate) fn select_game_creator_model(
     model_id: String,
     is_default: bool,
     agent_mode: Option<String>,
+    protocol: Option<String>,
 ) -> Result<GameCreatorAppConfigView, String> {
-    select_game_creator_model_inner(model_id, is_default, agent_mode)
+    select_game_creator_model_inner(model_id, is_default, agent_mode, protocol)
 }
 
 fn persist_game_creator_app_config(
diff --git a/apps/ai-game-creator-shell/src-tauri/src/config.rs b/apps/ai-game-creator-shell/src-tauri/src/config.rs
index 6eb153861..2eaf16112 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/config.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/config.rs
@@ -4037,6 +4037,9 @@ fn merge_game_creator_config_content(
     if let Some(selected_model_is_default) = file_config.selected_model_is_default {
         config.selected_model_is_default = selected_model_is_default;
     }
+    if let Some(selected_model_protocol) = file_config.selected_model_protocol {
+        config.selected_model_protocol = Some(selected_model_protocol);
+    }
     Ok(())
 }
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs b/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
index 0944e4f9f..7e89cb64f 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/llm_catalog.rs
@@ -16,6 +16,10 @@ fn default_codex_agent_mode() -> String {
     "codex".to_string()
 }
 
+fn default_model_protocol() -> String {
+    "openai_responses".to_string()
+}
+
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct WireModelSummary {
@@ -23,6 +27,9 @@ struct WireModelSummary {
     display_name: String,
     #[serde(default = "default_codex_agent_mode")]
     agent_mode: String,
+    /// 线协议与执行器正交；旧服务端不下发时按 OpenAI Responses 兼容。
+    #[serde(default = "default_model_protocol")]
+    protocol: String,
 }
 
 #[derive(Debug, Deserialize)]
@@ -56,6 +63,7 @@ fn map_catalog(catalog: WireModelCatalog) -> LlmModelsResponse {
                 id: model.id,
                 display_name: model.display_name,
                 agent_mode: model.agent_mode,
+                protocol: model.protocol,
             })
             .collect(),
         revision: catalog.revision,
diff --git a/apps/ai-game-creator-shell/src-tauri/src/main.rs b/apps/ai-game-creator-shell/src-tauri/src/main.rs
index ea1b8dc56..befa993db 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/main.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/main.rs
@@ -812,6 +812,9 @@ struct GameCreatorAppConfigFile {
     selected_model_id: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     selected_model_is_default: Option<bool>,
+    /// 所选模型的上游线协议，与 `agent_mode`（执行器）正交。
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    selected_model_protocol: Option<String>,
 }
 
 #[derive(Clone, Debug, Default, Deserialize, Serialize)]
@@ -873,6 +876,9 @@ struct GameCreatorAppConfig {
     selected_model_id: String,
     #[serde(default)]
     selected_model_is_default: bool,
+    /// 所选模型的上游线协议；缺省按执行器推导。
+    #[serde(default)]
+    selected_model_protocol: Option<String>,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
@@ -1384,6 +1390,7 @@ impl Default for GameCreatorAppConfig {
             editor_api: GameCreatorEditorApiConfig::default(),
             selected_model_id: String::new(),
             selected_model_is_default: false,
+            selected_model_protocol: None,
         }
     }
 }
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
index b7b44234b..2bc9df75c 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
@@ -19,6 +19,22 @@ import {
   refreshLlmModelCatalog,
 } from '../../services/llmModelCatalog';
 
+/**
+ * 线协议与执行器正交；目录没下发时按执行器推导默认协议，保证发往后端的组合始终合法。
+ */
+function resolveModelProtocol(
+  model: { agentMode?: 'codex' | 'cc'; protocol?: string } | undefined,
+): 'openai_responses' | 'openai_chat' | 'anthropic' {
+  if (
+    model?.protocol === 'openai_responses' ||
+    model?.protocol === 'openai_chat' ||
+    model?.protocol === 'anthropic'
+  ) {
+    return model.protocol;
+  }
+  return model?.agentMode === 'cc' ? 'anthropic' : 'openai_responses';
+}
+
 export type ConversationModelSelectHandle = {
   /** 发送前校验：刷新目录，并在所选模型已停用/删除时回退默认模型。 */
   ensureUsable: () => Promise<boolean>;
@@ -174,6 +190,9 @@ export function ConversationModelSelect({
               agentMode:
                 catalog.models.find((model) => model.id === next)?.agentMode ??
                 'codex',
+              protocol: resolveModelProtocol(
+                catalog.models.find((model) => model.id === next),
+              ),
             }),
           );
         } catch {
@@ -341,11 +360,15 @@ export function ConversationModelSelect({
       if (!invoke) throw new Error('Native host unavailable');
       const agentMode =
         models.find((model) => model.id === id)?.agentMode ?? 'codex';
+      const protocol = resolveModelProtocol(
+        models.find((model) => model.id === id),
+      );
       const result = await queueConfigWrite(() =>
         invoke<GameCreatorAppConfigView>('select_game_creator_model', {
           modelId: id,
           isDefault: false,
           agentMode,
+          protocol,
         }),
       );
       if (result.config.selectedModelId !== id)
diff --git a/apps/ai-game-creator-shell/src/services/clientApi.ts b/apps/ai-game-creator-shell/src/services/clientApi.ts
index 2221e5cfd..5c1bff3cc 100644
--- a/apps/ai-game-creator-shell/src/services/clientApi.ts
+++ b/apps/ai-game-creator-shell/src/services/clientApi.ts
@@ -3,7 +3,10 @@ import { resolveTauriInvoke } from '../app/tauri';
 export type ClientLlmModel = {
   displayName: string;
   id: string;
-  agentMode: 'codex' | 'cc' | 'anthropic';
+  /** 执行器：codex 或 cc。线协议是与之正交的独立维度。 */
+  agentMode: 'codex' | 'cc';
+  /** 上游线协议；服务端未下发时按执行器的默认协议解释。 */
+  protocol?: 'openai_responses' | 'openai_chat' | 'anthropic';
 };
 
 export type ClientLlmModelCatalog = {
diff --git a/apps/ai-game-creator-shell/tests/appSurface/design-agent.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/design-agent.suite.ts
index 15ec5f80d..d96c09714 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/design-agent.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/design-agent.suite.ts
@@ -282,6 +282,7 @@ export function registerDesignAgentSurfaceTests() {
         modelId: 'fast',
         isDefault: false,
         agentMode: 'codex',
+        protocol: 'openai_responses',
       });
       expect(
         screen.getByRole('button', { name: '对话模型' }).textContent,
diff --git a/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
index 912be89a7..c0c9a5327 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
@@ -149,6 +149,7 @@ export function registerClientHomeTests() {
         modelId: 'fast',
         isDefault: false,
         agentMode: 'codex',
+        protocol: 'openai_responses',
       }),
     );
     expect(modelTrigger.textContent).toContain('快速');
diff --git a/apps/ai-game-creator-shell/tests/conversationModelSelect.test.tsx b/apps/ai-game-creator-shell/tests/conversationModelSelect.test.tsx
index 9208b832b..c2a5c252f 100644
--- a/apps/ai-game-creator-shell/tests/conversationModelSelect.test.tsx
+++ b/apps/ai-game-creator-shell/tests/conversationModelSelect.test.tsx
@@ -130,6 +130,7 @@ test('custom mode only shows checked endpoint model IDs and never requests the p
     modelId: 'vendor/fast:latest',
     isDefault: false,
     agentMode: 'codex',
+    protocol: 'openai_responses',
   });
 });
 
@@ -290,6 +291,7 @@ test('only displays aliases and persists selection through the native command',
       modelId: 'fast',
       isDefault: false,
       agentMode: 'cc',
+      protocol: 'anthropic',
     }),
   );
   await waitFor(() => expect(onReady).toHaveBeenLastCalledWith(true));
@@ -320,6 +322,7 @@ test('falls back to the default model when the saved selection was removed', asy
     modelId: 'quality',
     isDefault: true,
     agentMode: 'codex',
+    protocol: 'openai_responses',
   });
   expect(
     screen.getByRole('button', { name: '对话模型' }).textContent,
@@ -529,6 +532,7 @@ test('pre-send validation falls back when the selected model is disabled', async
     modelId: 'quality',
     isDefault: true,
     agentMode: 'codex',
+    protocol: 'openai_responses',
   });
 });
 
@@ -554,6 +558,7 @@ test('follows the new server default when the saved selection was the default',
     modelId: 'fast',
     isDefault: true,
     agentMode: 'cc',
+    protocol: 'anthropic',
   });
   expect(
     screen.getByRole('button', { name: '对话模型' }).textContent,
diff --git a/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md b/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
index 347575fbf..d14ae6087 100644
--- a/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
+++ b/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
@@ -55,8 +55,10 @@
 
 ## 模型绑定 Agent 执行模式
 
-- 后台 AGC 模型目录每项新增 `agentMode`，接受 `codex`、`cc` 与 `anthropic`；缺少该字段的历史目录按 `codex` 解释，后台新增模型默认 `codex`。`anthropic` 是 2026-10-01 新增的显式 Anthropic Messages 协议值，`cc` 保留为同一 Claude 执行器的历史别名（两者都映射到 `claude_code_cli`），新目录项应直接写 `anthropic`。
-- 2026-10-01 补充：`cc`/`anthropic` 一律经平台 LLM 网关的独立 Anthropic 路由 `POST /api/llm/anthropic/{*path}`，客户端 `ANTHROPIC_BASE_URL` 为 `{apiBaseUrl}/api/llm/anthropic`，不得再用配置里的 `llm.baseUrl`（那是 Router 地址，平台不会把账号 Router key 下发给客户端）。Claude Agent SDK 自己拼 `{base}/v1/messages` 并带 `authorization: bearer` 与 `anthropic-version`，网关据此转发上游 `{routerBase}/v1/messages`。
+- 后台 AGC 模型目录每项新增 `agentMode`，只接受 `codex` 与 `cc`；缺少该字段的历史目录按 `codex` 解释，后台新增模型默认 `codex`。
+- 2026-10-01 修正（原先误把协议塞进 `agentMode`）：**执行器与线协议是两个正交维度**。目录新增独立字段 `protocol`，取值 `openai_responses` / `openai_chat` / `anthropic`；`agentMode` 只表示客户端启动哪个执行器。合法组合是封闭的——`codex` 只能用 `openai_responses` 或 `openai_chat`，`cc` 只能用 `anthropic`，其余组合在后台保存与目录加载时都失败关闭。存量目录缺少 `protocol` 时按执行器推导（codex → `openai_responses`，cc → `anthropic`）；历史误写的 `agentMode: "anthropic"` 读取时归一到 `cc`。
+- 选路由协议决定：`openai_responses` → `/api/llm/v1/responses`，`openai_chat` → `/api/llm/v1/chat/completions`，`anthropic` → 独立路由 `/api/llm/anthropic/{*path}`。客户端把所选模型的协议与执行器一起持久化（`agentMode` + `selectedModelProtocol`），Codex 的 `wire_api` 按协议在 `responses` / `chat` 间切换。
+- 2026-10-01 补充：`cc` 一律经平台 LLM 网关的独立 Anthropic 路由，客户端 `ANTHROPIC_BASE_URL` 为 `{apiBaseUrl}/api/llm/anthropic`，不得再用配置里的 `llm.baseUrl`（那是 Router 地址，平台不会把账号 Router key 下发给客户端）。Claude Agent SDK 自己拼 `{base}/v1/messages` 并带 `authorization: bearer` 与 `anthropic-version`，网关据此转发上游 `{routerBase}/v1/messages`。
 - `codex` 仍表示现有 AGC Codex app-server 执行链路；`cc` 表示 AGC 客户端启动随包的 Claude Agent SDK sidecar，模型的 `modelId` 原样作为 Claude Agent SDK 的模型标识，不把 Claude 协议伪装成 OpenAI Responses。sidecar 随 AGC 安装包携带 SDK 及匹配平台的 Claude Code runtime，用户不需要预先安装 `claude` 命令。
 - `/api/llm/models` 的启用模型摘要返回 `agentMode`，后台完整目录、管理 DTO 和客户端目录保持同一绑定快照。客户端在选择模型时同时持久化模型 ID 与执行模式；默认模型变化、模型被停用或目录刷新回退时一并更新执行模式。
 - 客户端设置保存不得把后台模型绑定覆盖回 Codex。旧客户端配置缺少执行模式时继续按 Codex 运行；旧后台响应缺少 `agentMode` 时客户端按 Codex 兼容。
diff --git a/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md b/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
index fb31bb682..94f2a7a51 100644
--- a/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
+++ b/docs/【后端架构】server-rs与SpacetimeDB数据契约-2026-05-15.md
@@ -536,7 +536,7 @@ Responses 的终态载荷既是工具调用的恢复源，也是正文的恢复
 - 私有单例表，主键 `id=0`，保存 `catalog_json`、`revision`、`updated_at`；不存凭据。
 - `read_agc_model_catalog` / `save_agc_model_catalog` 只接受已登记的 runtime service identity，保存使用 revision 乐观锁；缺行时读取返回 `AGC_MODEL_CATALOG_NOT_INITIALIZED`，不返回任何内置目录。
 - 目录初始值来自上游同步：api-server（API/All 角色）启动时若目录缺失、结构与当前定义不符或校验不通过，就用分组定价列表 `GET {Router 控制面}/api/pricing?group=taonier`（公开只读、不带凭据）的 `data[].model_name` 生成目录（`id` 为模型名 slug，`alias`/`modelId` 为上游原名），失败只记录 error、不写替代目录，由下一次启动重试；未初始化期间 AGC 目录与对话接口、后台目录接口都失败关闭（`503`）。
-- 后台 owner 通过 `GET/PUT /admin/api/agc-models` 管理稳定标识、必填别名、实际模型名、启用状态和默认项；客户端 `GET /api/llm/models` 仅返回启用项的稳定标识、别名和目录 `revision`（供条件刷新，不暴露实际模型名）。
+- 后台 owner 通过 `GET/PUT /admin/api/agc-models` 管理稳定标识、必填别名、实际模型名、启用状态、默认项，以及**执行器 `agentMode` 与线协议 `protocol` 两个正交维度**：`agentMode` 只取 `codex` / `cc`，`protocol` 只取 `openai_responses` / `openai_chat` / `anthropic`，合法组合封闭（codex ⇒ responses/chat，cc ⇒ anthropic），非法组合在保存与加载两侧都失败关闭；存量目录缺 `protocol` 时按执行器推导。客户端 `GET /api/llm/models` 返回启用项的稳定标识、别名、`agentMode`、解析后的 `protocol` 和目录 `revision`（供条件刷新，不暴露实际模型名）。
 - Responses / Chat 请求按目录解析模型；未知或停用项拒绝。AGC 的 `platform-default` 请求标识使用目录默认项。详细契约见 `technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md`。
 
 ### `error_report`
diff --git a/server-rs/crates/api-server/src/agc_models.rs b/server-rs/crates/api-server/src/agc_models.rs
index 391e32f5f..4875fec63 100644
--- a/server-rs/crates/api-server/src/agc_models.rs
+++ b/server-rs/crates/api-server/src/agc_models.rs
@@ -9,6 +9,7 @@ use axum::{
 };
 use module_runtime::{
     AGC_MODEL_CATALOG_CONFLICT, AGC_MODEL_CATALOG_NOT_INITIALIZED, AgcAgentMode, AgcModelCatalog,
+    AgcModelProtocol,
 };
 use shared_contracts::admin::{AdminAgcModel, AdminAgcModelCatalog};
 use spacetime_client::SpacetimeClientError;
@@ -235,12 +236,21 @@ pub async fn admin_save_agc_models(
             let agent_mode = AgcAgentMode::parse(&m.agent_mode).map_err(|message| {
                 AppError::from_status(StatusCode::BAD_REQUEST).with_message(message)
             })?;
+            let protocol = m
+                .protocol
+                .as_deref()
+                .map(AgcModelProtocol::parse)
+                .transpose()
+                .map_err(|message| {
+                    AppError::from_status(StatusCode::BAD_REQUEST).with_message(message)
+                })?;
             Ok(module_runtime::AgcModel {
                 id: m.id,
                 alias: m.alias,
                 model_id: m.model_id,
                 enabled: m.enabled,
                 agent_mode,
+                protocol,
             })
         })
         .collect::<Result<Vec<_>, AppError>>()?;
@@ -277,12 +287,17 @@ fn catalog_dto(catalog: AgcModelCatalog) -> AdminAgcModelCatalog {
         models: catalog
             .models
             .into_iter()
-            .map(|m| AdminAgcModel {
-                id: m.id,
-                alias: m.alias,
-                model_id: m.model_id,
-                enabled: m.enabled,
-                agent_mode: m.agent_mode.as_str().to_string(),
+            .map(|m| {
+                // 回读给出解析后的具体协议，后台不会看到空值。
+                let protocol = m.resolved_protocol().as_str().to_string();
+                AdminAgcModel {
+                    id: m.id,
+                    alias: m.alias,
+                    model_id: m.model_id,
+                    enabled: m.enabled,
+                    agent_mode: m.agent_mode.as_str().to_string(),
+                    protocol: Some(protocol),
+                }
             })
             .collect(),
     }
diff --git a/server-rs/crates/api-server/src/llm/mod.rs b/server-rs/crates/api-server/src/llm/mod.rs
index 3ff4dc75c..b97a8da5d 100644
--- a/server-rs/crates/api-server/src/llm/mod.rs
+++ b/server-rs/crates/api-server/src/llm/mod.rs
@@ -198,11 +198,15 @@ fn public_model_catalog(catalog: module_runtime::AgcModelCatalog) -> LlmModelsRe
             .models
             .into_iter()
             .filter(|model| model.enabled)
-            .map(|model| LlmModelSummary {
-                id: model.id,
-                // 初始目录里别名就是上游原始模型名（不再填“高质量/快速”这类人工别名）。
-                display_name: model.alias,
-                agent_mode: model.agent_mode.as_str().to_string(),
+            .map(|model| {
+                let protocol = model.resolved_protocol().as_str().to_string();
+                LlmModelSummary {
+                    id: model.id,
+                    // 初始目录里别名就是上游原始模型名（不再填“高质量/快速”这类人工别名）。
+                    display_name: model.alias,
+                    agent_mode: model.agent_mode.as_str().to_string(),
+                    protocol,
+                }
             })
             .collect(),
         revision: catalog.revision,
diff --git a/server-rs/crates/module-runtime/src/agc_models.rs b/server-rs/crates/module-runtime/src/agc_models.rs
index e4ff1c5fb..a6d406afc 100644
--- a/server-rs/crates/module-runtime/src/agc_models.rs
+++ b/server-rs/crates/module-runtime/src/agc_models.rs
@@ -16,10 +16,10 @@ pub const AGC_MODEL_CATALOG_MAX_MODELS: usize = 32;
 #[serde(rename_all = "lowercase")]
 pub enum AgcAgentMode {
     Codex,
+    /// `anthropic` 是早期把协议混进执行器时写下的历史取值，读取时归一到 `cc`；
+    /// 协议本身由 `AgcModel.protocol` 表达。
+    #[serde(alias = "anthropic")]
     Cc,
-    /// 显式 Anthropic Messages 协议。`cc` 是同一执行器的历史别名，
-    /// 新目录项应直接写 `anthropic`。
-    Anthropic,
 }
 
 impl Default for AgcAgentMode {
@@ -33,7 +33,6 @@ impl AgcAgentMode {
         match self {
             Self::Codex => "codex",
             Self::Cc => "cc",
-            Self::Anthropic => "anthropic",
         }
     }
 
@@ -41,8 +40,68 @@ impl AgcAgentMode {
         match value {
             "codex" => Ok(Self::Codex),
             "cc" => Ok(Self::Cc),
+            _ => Err("Agent 模式只允许 codex 或 cc".into()),
+        }
+    }
+
+    /// 该执行器允许的线协议。协议与执行器是正交维度，但合法组合是封闭的：
+    /// Codex 只能走 OpenAI Responses / Chat Completions，Claude Code 只能走
+    /// Anthropic Messages。
+    pub const fn supports(self, protocol: AgcModelProtocol) -> bool {
+        match self {
+            Self::Codex => matches!(
+                protocol,
+                AgcModelProtocol::OpenAiResponses | AgcModelProtocol::OpenAiChat
+            ),
+            Self::Cc => matches!(protocol, AgcModelProtocol::Anthropic),
+        }
+    }
+
+    /// 存量目录缺少协议字段时按执行器的默认线协议解释。
+    pub const fn default_protocol(self) -> AgcModelProtocol {
+        match self {
+            Self::Codex => AgcModelProtocol::OpenAiResponses,
+            Self::Cc => AgcModelProtocol::Anthropic,
+        }
+    }
+}
+
+/// 上游线协议，与执行器正交。
+///
+/// `openai_responses` / `openai_chat` 走 `/api/llm/v1/responses` 与
+/// `/api/llm/v1/chat/completions`；`anthropic` 走独立的
+/// `/api/llm/anthropic/{*path}`。
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum AgcModelProtocol {
+    #[serde(rename = "openai_responses")]
+    OpenAiResponses,
+    #[serde(rename = "openai_chat")]
+    OpenAiChat,
+    #[serde(rename = "anthropic")]
+    Anthropic,
+}
+
+impl Default for AgcModelProtocol {
+    fn default() -> Self {
+        Self::OpenAiResponses
+    }
+}
+
+impl AgcModelProtocol {
+    pub const fn as_str(self) -> &'static str {
+        match self {
+            Self::OpenAiResponses => "openai_responses",
+            Self::OpenAiChat => "openai_chat",
+            Self::Anthropic => "anthropic",
+        }
+    }
+
+    pub fn parse(value: &str) -> Result<Self, String> {
+        match value {
+            "openai_responses" => Ok(Self::OpenAiResponses),
+            "openai_chat" => Ok(Self::OpenAiChat),
             "anthropic" => Ok(Self::Anthropic),
-            _ => Err("Agent 模式只允许 codex、cc 或 anthropic".into()),
+            _ => Err("协议只允许 openai_responses、openai_chat 或 anthropic".into()),
         }
     }
 }
@@ -57,6 +116,18 @@ pub struct AgcModel {
     /// 绑定 AGC 客户端实际启动的 Agent，存量目录缺失时兼容为 Codex。
     #[serde(default)]
     pub agent_mode: AgcAgentMode,
+    /// 上游线协议。存量目录缺失时按 `agent_mode` 的默认协议解释；
+    /// 保存时必须与 `agent_mode` 组成合法组合。
+    #[serde(default)]
+    pub protocol: Option<AgcModelProtocol>,
+}
+
+impl AgcModel {
+    /// 显式协议优先，缺失时回退到执行器的默认协议。
+    pub fn resolved_protocol(&self) -> AgcModelProtocol {
+        self.protocol
+            .unwrap_or_else(|| self.agent_mode.default_protocol())
+    }
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -97,6 +168,7 @@ impl AgcModelCatalog {
                 model_id,
                 enabled: true,
                 agent_mode: AgcAgentMode::default(),
+                protocol: None,
             });
         }
         let default_model_id = entries
@@ -147,6 +219,14 @@ impl AgcModelCatalog {
             {
                 return Err("实际模型名不能为空，长度不能超过 200 字节".into());
             }
+            let protocol = model.resolved_protocol();
+            if !model.agent_mode.supports(protocol) {
+                return Err(format!(
+                    "Agent 模式 {} 不支持协议 {}：Codex 只能用 openai_responses / openai_chat，Claude Code 只能用 anthropic",
+                    model.agent_mode.as_str(),
+                    protocol.as_str()
+                ));
+            }
         }
         self.resolve(&self.default_model_id).map(|_| ())
     }
@@ -235,6 +315,7 @@ mod tests {
             model_id: model_id.into(),
             enabled: true,
             agent_mode: AgcAgentMode::default(),
+            protocol: None,
         }
     }
 
@@ -345,20 +426,13 @@ mod tests {
     }
 
     #[test]
-    fn catalog_agent_mode_accepts_codex_cc_and_anthropic_only() {
+    fn catalog_agent_mode_rejects_values_outside_codex_and_cc() {
         let mut catalog =
             AgcModelCatalog::from_upstream_models(upstream(&["model-a", "model-b"]), 0).unwrap();
         catalog.models[0].agent_mode = AgcAgentMode::Cc;
         assert!(catalog.validate().is_ok());
         assert_eq!(catalog.models[0].agent_mode.as_str(), "cc");
-
-        catalog.models[0].agent_mode = AgcAgentMode::Anthropic;
-        assert!(catalog.validate().is_ok());
-        assert_eq!(catalog.models[0].agent_mode.as_str(), "anthropic");
-        assert_eq!(
-            AgcAgentMode::parse("anthropic").unwrap(),
-            AgcAgentMode::Anthropic
-        );
+        assert!(AgcAgentMode::parse("anthropic").is_err());
 
         let invalid: Result<AgcModelCatalog, _> = serde_json::from_str(
             r#"{"revision":0,"defaultModelId":"model-a","models":[{"id":"model-a","alias":"model-a","modelId":"model-a","enabled":true,"agentMode":"provider"}]}"#,
@@ -366,6 +440,47 @@ mod tests {
         assert!(invalid.is_err());
     }
 
+    #[test]
+    fn protocol_is_orthogonal_to_agent_mode_and_pairs_are_closed() {
+        // 协议缺省按执行器推导：codex -> openai_responses，cc -> anthropic。
+        let mut catalog =
+            AgcModelCatalog::from_upstream_models(upstream(&["model-a", "model-b"]), 0).unwrap();
+        assert_eq!(
+            catalog.models[0].resolved_protocol(),
+            AgcModelProtocol::OpenAiResponses
+        );
+        catalog.models[0].agent_mode = AgcAgentMode::Cc;
+        assert_eq!(
+            catalog.models[0].resolved_protocol(),
+            AgcModelProtocol::Anthropic
+        );
+        assert_eq!(
+            AgcModelProtocol::parse("anthropic").unwrap().as_str(),
+            "anthropic"
+        );
+
+        // codex 支持两种 OpenAI 线协议。
+        catalog.models[0].agent_mode = AgcAgentMode::Codex;
+        catalog.models[0].protocol = Some(AgcModelProtocol::OpenAiChat);
+        assert!(catalog.validate().is_ok());
+        catalog.models[0].protocol = Some(AgcModelProtocol::OpenAiResponses);
+        assert!(catalog.validate().is_ok());
+
+        // 非法组合必须失败关闭：codex + anthropic。
+        catalog.models[0].protocol = Some(AgcModelProtocol::Anthropic);
+        let error = catalog
+            .validate()
+            .expect_err("codex must reject the anthropic protocol");
+        assert!(error.contains("不支持协议"), "{error}");
+
+        // cc 只支持 anthropic。
+        catalog.models[0].agent_mode = AgcAgentMode::Cc;
+        catalog.models[0].protocol = Some(AgcModelProtocol::OpenAiChat);
+        assert!(catalog.validate().is_err());
+        catalog.models[0].protocol = Some(AgcModelProtocol::Anthropic);
+        assert!(catalog.validate().is_ok());
+    }
+
     #[test]
     fn catalog_rejects_duplicate_aliases_and_ids() {
         let mut catalog =
diff --git a/server-rs/crates/shared-contracts/src/admin.rs b/server-rs/crates/shared-contracts/src/admin.rs
index 0309a831d..ad9d7af64 100644
--- a/server-rs/crates/shared-contracts/src/admin.rs
+++ b/server-rs/crates/shared-contracts/src/admin.rs
@@ -1663,6 +1663,10 @@ pub struct AdminAgcModel {
     /// 旧后台请求缺失时按 Codex 兼容。
     #[serde(default = "default_codex_agent_mode")]
     pub agent_mode: String,
+    /// 上游线协议，与 `agent_mode` 正交。缺省时按 `agent_mode` 的默认协议解释，
+    /// 服务端回读时始终给出解析后的具体值。
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub protocol: Option<String>,
 }
 
 #[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
diff --git a/server-rs/crates/shared-contracts/src/llm.rs b/server-rs/crates/shared-contracts/src/llm.rs
index 0b958f23f..a02708cf7 100644
--- a/server-rs/crates/shared-contracts/src/llm.rs
+++ b/server-rs/crates/shared-contracts/src/llm.rs
@@ -65,7 +65,10 @@ mod tests {
 pub struct LlmModelSummary {
     pub display_name: String,
     pub id: String,
+    /// 执行器：`codex` 或 `cc`。
     pub agent_mode: String,
+    /// 上游线协议，与执行器正交：`openai_responses` / `openai_chat` / `anthropic`。
+    pub protocol: String,
 }
 
 #[derive(Debug, serde::Serialize)]