feat(chat): expose model options config

src/chat/modelConfig.ts

@@ -0,0 +1,78 @@
+export type SupportedModel = string;
+export type AgentModelIcon = "bolt" | "sparkle";
+
+export type AgentModelOption = {
+  id: SupportedModel;
+  label: string;
+  description: string;
+  icon: AgentModelIcon;
+};
+
+export const defaultAgentModelOptions: AgentModelOption[] = [
+  {
+    id: "deepseek/deepseek-v4-flash",
+    label: "快速",
+    description: "快速回答和任务执行",
+    icon: "bolt",
+  },
+  {
+    id: "deepseek/deepseek-v4-pro",
+    label: "专家",
+    description: "探索、解决复杂任务",
+    icon: "sparkle",
+  },
+];
+
+export const defaultAgentModelOptionsJson = JSON.stringify(defaultAgentModelOptions);
+
+const isObjectRecord = (value: unknown): value is Record<string, unknown> =>
+  typeof value === "object" && value !== null && !Array.isArray(value);
+
+export const parseAgentModelOptions = (value: string): AgentModelOption[] => {
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(value);
+  } catch {
+    throw new Error("OPENCODE_MODEL_OPTIONS must be valid JSON");
+  }
+  if (!Array.isArray(parsed)) {
+    throw new Error("OPENCODE_MODEL_OPTIONS must be a JSON array");
+  }
+
+  const seen = new Set<string>();
+  return parsed.map((item, index) => {
+    if (!isObjectRecord(item)) {
+      throw new Error(`OPENCODE_MODEL_OPTIONS[${index}] must be an object`);
+    }
+    const id = typeof item.id === "string" ? item.id.trim() : "";
+    if (!id) {
+      throw new Error(`OPENCODE_MODEL_OPTIONS[${index}].id is required`);
+    }
+    if (seen.has(id)) {
+      throw new Error(`duplicate OPENCODE_MODEL_OPTIONS id: ${id}`);
+    }
+    seen.add(id);
+
+    const label =
+      typeof item.label === "string" && item.label.trim()
+        ? item.label.trim()
+        : id;
+    const description =
+      typeof item.description === "string" && item.description.trim()
+        ? item.description.trim()
+        : label;
+    const icon = item.icon === "bolt" || item.icon === "sparkle"
+      ? item.icon
+      : "sparkle";
+
+    return {
+      id,
+      label,
+      description,
+      icon,
+    };
+  });
+};
+
+export const getAgentModelIds = (options: AgentModelOption[]) =>
+  options.map((option) => option.id);

src/chat/models.ts

@@ -0,0 +1,28 @@
+import { config } from "../config.js";
+import {
+  getAgentModelIds,
+  parseAgentModelOptions,
+  type SupportedModel,
+} from "./modelConfig.js";
+
+export {
+  type AgentModelIcon,
+  type AgentModelOption,
+  type SupportedModel,
+} from "./modelConfig.js";
+
+export const agentModelOptions = parseAgentModelOptions(
+  config.OPENCODE_MODEL_OPTIONS,
+);
+
+export const supportedModels = getAgentModelIds(agentModelOptions);
+
+export const isSupportedModel = (model: string): model is SupportedModel =>
+  supportedModels.includes(model);
+
+export const resolveDefaultModel = (model: string): SupportedModel => {
+  if (!isSupportedModel(model)) {
+    throw new Error(`unsupported default agent model: ${model}`);
+  }
+  return model;
+};

src/config.ts

@@ -1,6 +1,12 @@
 import dotenv from "dotenv";
 import { z } from "zod";
 
+import {
+  defaultAgentModelOptionsJson,
+  getAgentModelIds,
+  parseAgentModelOptions,
+} from "./chat/modelConfig.js";
+
 // 本地开发可在项目根目录放 .local.env；已存在的系统环境变量优先级更高。
 dotenv.config({ path: ".local.env", override: false });
 
@@ -45,6 +51,8 @@ const envSchema = z
     OPENCODE_TIMEOUT_MS: z.coerce.number().int().positive().default(5000),
     // 默认使用的 opencode 模型标识。
     OPENCODE_MODEL: z.string().default("deepseek/deepseek-v4-flash"),
+    // 聊天 UI 和 /stream 允许选择的 opencode 模型完整配置，JSON 数组。
+    OPENCODE_MODEL_OPTIONS: z.string().default(defaultAgentModelOptionsJson),
     // opencode skills 树目录；会在运行时解析为绝对路径，避免工具 cwd 偏移。
     OPENCODE_SKILLS_ROOT_DIR: z.string().default("./.opencode/skills"),
     // client 模式下，目标 opencode server 的基础地址。
@@ -116,6 +124,32 @@ const envSchema = z
         message: "OPENCODE_CLIENT_BASE_URL is required when OPENCODE_MODE=client",
       });
     }
+    let modelOptions;
+    try {
+      modelOptions = parseAgentModelOptions(env.OPENCODE_MODEL_OPTIONS);
+    } catch (error) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL_OPTIONS"],
+        message: error instanceof Error ? error.message : String(error),
+      });
+      return;
+    }
+    const supportedModels = getAgentModelIds(modelOptions);
+    if (supportedModels.length === 0) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL_OPTIONS"],
+        message: "OPENCODE_MODEL_OPTIONS must include at least one model",
+      });
+    }
+    if (!supportedModels.includes(env.OPENCODE_MODEL)) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ["OPENCODE_MODEL"],
+        message: "OPENCODE_MODEL must be included in OPENCODE_MODEL_OPTIONS",
+      });
+    }
   });
 
 export type AppConfig = z.infer<typeof envSchema>;

src/learning/orchestrator.ts

@@ -1,6 +1,7 @@
 import { z } from "zod";
 
 import { writeLearningAuditLog } from "../audit/learningAudit.js";
+import { type SupportedModel } from "../chat/models.js";
 import { type ChatRequestContext } from "../chat/sessionBridge.js";
 import { config } from "../config.js";
 import { type SessionTurnRecord, SessionTranscriptStore } from "../sessions/transcriptStore.js";
@@ -64,8 +65,6 @@ const reviewResultSchema = z.object({
 type GateResult = z.infer<typeof gateResultSchema>;
 type ReviewResult = z.infer<typeof reviewResultSchema>;
 
-type SupportedModel = "deepseek/deepseek-v4-flash" | "deepseek/deepseek-v4-pro";
-
 type TurnReviewInput = {
   assistantMessage: string;
   model?: SupportedModel;

src/routes/chat.ts

@@ -1,6 +1,13 @@
 import { Router } from "express";
 import { z } from "zod";
 
+import {
+  agentModelOptions,
+  isSupportedModel,
+  resolveDefaultModel,
+  type SupportedModel,
+} from "../chat/models.js";
+import { config } from "../config.js";
 import { type LearningOrchestrator } from "../learning/orchestrator.js";
 import { type SessionTranscriptStore } from "../sessions/transcriptStore.js";
 import { logger } from "../logger.js";
@@ -28,8 +35,6 @@ import {
   type PermissionRequestPayload,
   type QuestionRequestPayload,
   streamPromptResponse,
-  supportedModels,
-  type SupportedModel,
   type TodoUpdatePayload,
 } from "./chatStream.js";
 import {
@@ -54,7 +59,9 @@ import {
 const payloadSchema = z.object({
   message: z.string().min(1).max(10000),
   session_id: z.string().max(128).optional(),
-  model: z.enum(supportedModels).optional(),
+  model: z.string().refine(isSupportedModel, {
+    message: "unsupported model",
+  }).optional(),
   approval_mode: z.enum(["request", "always"]).optional().default("request"),
 });
 
@@ -115,6 +122,13 @@ export const buildChatRouter = (
 ) => {
   const chatRouter = Router();
 
+  chatRouter.get("/models", (_req, res) => {
+    res.json({
+      default_model: resolveDefaultModel(config.OPENCODE_MODEL),
+      models: agentModelOptions,
+    });
+  });
+
   chatRouter.post("/session", async (req, res) => {
     const parsed = createSessionPayloadSchema.safeParse(req.body ?? {});
     if (!parsed.success) {

src/routes/chatStream.ts

@@ -1,6 +1,7 @@
 import type { Event as OpencodeEvent, Part } from "@opencode-ai/sdk/v2";
 
 import { writeLlmRequestAuditLog } from "../audit/llmRequestAudit.js";
+import { type SupportedModel } from "../chat/models.js";
 import { logger } from "../logger.js";
 import {
   type PermissionReply,
@@ -54,12 +55,6 @@ export {
   type TodoUpdatePayload,
 } from "./chatStreamEvents.js";
 
-export const supportedModels = [
-  "deepseek/deepseek-v4-flash",
-  "deepseek/deepseek-v4-pro",
-] as const;
-
-export type SupportedModel = (typeof supportedModels)[number];
 export type ApprovalMode = "request" | "always";
 
 type StreamPromptOptions = {