diff --git a/agents/coder.md b/agents/coder.md
new file mode 100644
index 0000000..bf6217c
--- /dev/null
+++ b/agents/coder.md
@@ -0,0 +1,16 @@
+---
+name: coder
+description: 代码实现专家，负责编写、修改、重构代码文件
+tools: code_editor, git_tools, file_manager, cmd_executor
+model:
+---
+你是一个资深程序员「coder」，专注于把需求变成可运行的代码。
+
+工作准则：
+1. 先读取相关文件，理解现有结构与风格，再动手。
+2. 改动保持最小且自洽，新增代码加必要注释。
+3. 涉及多文件时，先给出改动清单再逐个落地。
+4. 完成后做冒烟验证（语法 / 类型 / 单元测试）。
+
+任务完成后，用如下 JSON 报告：
+{"status": "done", "summary": "一句话总结", "details": "关键改动与验证结果"}
diff --git a/agents/reviewer.md b/agents/reviewer.md
new file mode 100644
index 0000000..23e1b6e
--- /dev/null
+++ b/agents/reviewer.md
@@ -0,0 +1,20 @@
+---
+name: reviewer
+description: 代码审查专家，负责检查质量、安全与一致性
+tools: code_editor, git_tools, file_manager
+model:
+---
+你是一个严格的代码审查员「reviewer」，独立于实现者审视代码。
+
+审查维度：
+1. 正确性：逻辑漏洞、边界条件、异常处理。
+2. 安全性：注入、越权、敏感信息泄露、危险命令。
+3. 一致性：命名、风格、是否贴合项目既有约定。
+4. 可维护性：重复、复杂度、可读性。
+
+输出格式（按严重度分级）：
+- 🔴 严重：必须修改
+- 🟡 建议：建议修改
+- 🟢 亮点：值得保留
+
+最后给出总体评价与是否可合入的结论。
diff --git a/tests/test_agents.py b/tests/test_agents.py
new file mode 100644
index 0000000..aaed00b
--- /dev/null
+++ b/tests/test_agents.py
@@ -0,0 +1,104 @@
+"""Agents 体系化测试 - AgentManager 加载/解析/委派（不触真实引擎）"""
+import os
+import tempfile
+import textwrap
+
+from xcli_core.agent_manager import AgentManager, AgentDef
+
+
+def _write(path, text):
+    with open(path, "w", encoding="utf-8") as f:
+        f.write(text)
+
+
+def test_parse_frontmatter():
+    text = textwrap.dedent("""\
+    ---
+    name: coder
+    description: 代码实现专家
+    tools: code_editor, git_tools, file_manager
+    model: gpt-4o
+    ---
+    你是一个资深程序员。
+    任务完成后报告结果。
+    """)
+    d = AgentManager._parse(text, name="coder")
+    assert isinstance(d, AgentDef)
+    assert d.name == "coder"
+    assert d.description == "代码实现专家"
+    assert d.tools == ["code_editor", "git_tools", "file_manager"]
+    assert d.model == "gpt-4o"
+    assert "资深程序员" in d.system_prompt
+
+
+def test_parse_no_frontmatter_uses_filename_and_body():
+    text = "纯文本 agent 定义，无 frontmatter。"
+    d = AgentManager._parse(text, name="plain")
+    assert d.name == "plain"
+    assert d.system_prompt == text
+    assert d.tools == []
+
+
+def test_load_dir_and_list():
+    with tempfile.TemporaryDirectory() as td:
+        _write(os.path.join(td, "coder.md"), textwrap.dedent("""\
+        ---
+        name: coder
+        description: 编码
+        tools: code_editor
+        ---
+        写代码。
+        """))
+        _write(os.path.join(td, "reviewer.md"), textwrap.dedent("""\
+        ---
+        name: reviewer
+        description: 审查
+        tools: code_editor, git_tools
+        ---
+        审代码。
+        """))
+        _write(os.path.join(td, "skip.txt"), "不是 md")
+        mgr = AgentManager()
+        n = mgr.load_dir(td)
+        assert n == 2
+        assert set(mgr.names()) == {"coder", "reviewer"}
+        assert mgr.get("coder").description == "编码"
+        assert mgr.get("missing") is None
+
+
+def test_load_dir_missing_dir_is_noop():
+    mgr = AgentManager()
+    assert mgr.load_dir("") == 0
+    assert mgr.load_dir("/no/such/dir/xyz") == 0
+
+
+def test_dispatch_calls_runner_with_fields():
+    mgr = AgentManager()
+    mgr._agents["coder"] = AgentDef(
+        name="coder", description="编码",
+        tools=["code_editor"], model="gpt-4o",
+        system_prompt="你是 coder。",
+    )
+    captured = {}
+    def runner(system_prompt, task, tools, model):
+        captured["system_prompt"] = system_prompt
+        captured["task"] = task
+        captured["tools"] = tools
+        captured["model"] = model
+        return f"done:{task}"
+    out = mgr.dispatch("coder", "写 hello.py", runner)
+    assert out == "done:写 hello.py"
+    assert captured["system_prompt"] == "你是 coder。"
+    assert captured["tools"] == ["code_editor"]
+    assert captured["model"] == "gpt-4o"
+
+
+def test_dispatch_missing_raises():
+    mgr = AgentManager()
+    def runner(*a):
+        return "x"
+    try:
+        mgr.dispatch("nope", "t", runner)
+        assert False, "expected KeyError"
+    except KeyError:
+        pass
diff --git a/tests/test_provider_router.py b/tests/test_provider_router.py
new file mode 100644
index 0000000..0f4527e
--- /dev/null
+++ b/tests/test_provider_router.py
@@ -0,0 +1,135 @@
+"""Provider 抽象层测试：预设、resolve、消息/工具转换、汇总。不触网、不读真实 config。"""
+import os
+import sys
+import types
+
+import pytest
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from xcli_core.provider_router import (
+    PROVIDER_PRESETS, list_providers, resolve_provider,
+    convert_messages, convert_tools, provider_summary,
+)
+
+
+def test_presets_exist():
+    for name in ["openai", "anthropic", "google", "deepseek", "xunfei", "ollama"]:
+        assert name in PROVIDER_PRESETS
+    assert "openai" in list_providers()
+
+
+def test_resolve_default_no_key():
+    r = resolve_provider("openai")
+    assert r["name"] == "openai"
+    assert r["base_url"] == "https://api.openai.com/v1"
+    assert r["protocol"] == "openai"
+    # 无环境变量无配置 → api_key 空
+    assert r["api_key"] == ""
+
+
+def test_resolve_from_env(monkeypatch):
+    monkeypatch.setenv("OPENAI_API_KEY", "sk-test-123")
+    r = resolve_provider("openai")
+    assert r["api_key"] == "sk-test-123"
+
+
+def test_resolve_from_cfg_overrides_env(monkeypatch):
+    monkeypatch.setenv("OPENAI_API_KEY", "sk-env")
+    r = resolve_provider("openai", {"openai": {"api_key": "sk-cfg", "model": "gpt-4o-mini"}})
+    assert r["api_key"] == "sk-cfg"
+    assert r["model"] == "gpt-4o-mini"
+
+
+def test_resolve_anthropic_headers():
+    r = resolve_provider("anthropic", {"anthropic": {"api_key": "ak"}})
+    assert r["protocol"] == "anthropic"
+    assert r["headers"].get("anthropic-version") == "2023-06-01"
+
+
+def test_resolve_google_query_header():
+    r = resolve_provider("google", {"google": {"api_key": "gk"}})
+    assert r["headers"].get("x-goog-api-key") == "gk"
+
+
+def test_resolve_unknown():
+    assert resolve_provider("not-a-provider") == {}
+
+
+# ── 消息转换 ──
+OPENAI_MSGS = [
+    {"role": "system", "content": "你是助手"},
+    {"role": "user", "content": "你好"},
+    {"role": "assistant", "content": "在的", "tool_calls": [{"id": "c1"}]},
+    {"role": "tool", "content": "结果", "name": "calc"},
+]
+
+
+def test_convert_openai_keeps():
+    out = convert_messages("openai", OPENAI_MSGS)
+    assert out[0]["role"] == "system"
+    assert out[1]["content"] == "你好"
+    assert out[2]["tool_calls"] == [{"id": "c1"}]
+
+
+def test_convert_anthropic_strips_system_blocks():
+    out = convert_messages("anthropic", OPENAI_MSGS)
+    roles = [m["role"] for m in out]
+    assert "system" not in roles
+    assert out[0]["content"][0]["type"] == "text"
+    assert out[-1]["role"] == "user"  # tool 角色映射到 user
+
+
+def test_convert_google_uses_parts():
+    out = convert_messages("google", OPENAI_MSGS)
+    roles = [m["role"] for m in out]
+    assert "system" not in roles
+    assert out[0]["parts"][0]["text"] == "你好"
+    assert out[-1]["role"] == "user"
+
+
+def test_convert_multimodal_content_blocks():
+    msgs = [{"role": "user", "content": [
+        {"type": "text", "text": "看图"},
+        {"type": "image", "image_url": {"url": "x"}},
+    ]}]
+    oai = convert_messages("openai", msgs)
+    assert oai[0]["content"] == "看图"  # 多模态 → 文本拼接
+    ant = convert_messages("anthropic", msgs)
+    assert ant[0]["content"][0]["type"] == "text"
+    assert ant[0]["content"][1]["type"] == "image"
+
+
+# ── 工具转换 ──
+TOOLS = [{"type": "function", "function": {
+    "name": "search", "description": "搜索", "parameters": {"type": "object", "properties": {}}}}]
+
+
+def test_convert_tools_openai_passthrough():
+    assert convert_tools("openai", TOOLS) == TOOLS
+
+
+def test_convert_tools_anthropic_schema():
+    out = convert_tools("anthropic", TOOLS)
+    assert out[0]["name"] == "search"
+    assert out[0]["input_schema"] == {"type": "object", "properties": {}}
+
+
+def test_convert_tools_google_declarations():
+    out = convert_tools("google", TOOLS)
+    assert "functionDeclarations" in out[0]
+    assert out[0]["functionDeclarations"][0]["name"] == "search"
+
+
+# ── 汇总 ──
+def test_provider_summary_unconfigured():
+    s = provider_summary("anthropic")
+    assert s["name"] == "anthropic"
+    assert s["configured"] is False
+    assert s["protocol"] == "anthropic"
+
+
+def test_provider_summary_configured(monkeypatch):
+    monkeypatch.setenv("ANTHROPIC_API_BASE", "ignored")
+    s = provider_summary("anthropic", {"anthropic": {"api_key": "x"}})
+    assert s["configured"] is True
diff --git a/xcli_core/agent_manager.py b/xcli_core/agent_manager.py
new file mode 100644
index 0000000..c4b9554
--- /dev/null
+++ b/xcli_core/agent_manager.py
@@ -0,0 +1,95 @@
+"""Agents 体系化 - opencode 式 markdown 定义 + @委派
+
+设计：
+- agents/ 目录下的 *.md 文件即 agent 定义，frontmatter 声明元数据：
+    ---
+    name: coder
+    description: 代码实现专家
+    tools: code_editor, git_tools, file_manager
+    model:
+    ---
+    正文即该 agent 的系统提示词。
+- AgentManager 负责加载、匹配、委派。
+- 委派执行通过注入的 runner 回调完成，便于测试（runner 不触真实引擎）。
+"""
+import os
+import re
+from dataclasses import dataclass, field
+from typing import Callable, Dict, List, Optional
+
+_FRONTMATTER_RE = re.compile(r"^---\s*\n(.*?)\n---\s*\n?(.*)$", re.DOTALL)
+
+
+@dataclass
+class AgentDef:
+    name: str
+    description: str = ""
+    tools: List[str] = field(default_factory=list)
+    model: Optional[str] = None
+    system_prompt: str = ""
+
+
+class AgentManager:
+    def __init__(self):
+        self._agents: Dict[str, AgentDef] = {}
+
+    # ── 加载 ──
+    def load_dir(self, directory: str) -> int:
+        """扫描目录下的 *.md，返回加载数量。目录不存在/为空则忽略。"""
+        if not directory or not os.path.isdir(directory):
+            return 0
+        count = 0
+        for fn in sorted(os.listdir(directory)):
+            if not fn.endswith(".md"):
+                continue
+            path = os.path.join(directory, fn)
+            try:
+                with open(path, "r", encoding="utf-8") as f:
+                    text = f.read()
+            except Exception:
+                continue
+            d = self._parse(text, name=os.path.splitext(fn)[0])
+            if d:
+                self._agents[d.name] = d
+                count += 1
+        return count
+
+    @staticmethod
+    def _parse(text: str, name: str) -> Optional[AgentDef]:
+        meta: Dict[str, str] = {}
+        body = text
+        m = _FRONTMATTER_RE.match(text)
+        if m:
+            meta_block = m.group(1)
+            body = m.group(2)
+            for line in meta_block.splitlines():
+                if ":" in line:
+                    k, v = line.split(":", 1)
+                    meta[k.strip()] = v.strip()
+        raw_tools = meta.get("tools", "")
+        tools = [t.strip() for t in raw_tools.split(",") if t.strip()]
+        return AgentDef(
+            name=meta.get("name", name),
+            description=meta.get("description", ""),
+            tools=tools,
+            model=meta.get("model") or None,
+            system_prompt=body.strip(),
+        )
+
+    # ── 查询 ──
+    def get(self, name: str) -> Optional[AgentDef]:
+        return self._agents.get(name)
+
+    def names(self) -> List[str]:
+        return list(self._agents.keys())
+
+    def list(self) -> List[AgentDef]:
+        return list(self._agents.values())
+
+    # ── 委派 ──
+    def dispatch(self, name: str, task: str, runner: Callable[[str, str, List[str], Optional[str]], str]) -> str:
+        """runner(system_prompt, task, tools, model) -> result 文本。"""
+        d = self.get(name)
+        if not d:
+            raise KeyError(f"agent not found: {name}")
+        return runner(d.system_prompt, task, d.tools, d.model)
diff --git a/xcli_core/cli_base.py b/xcli_core/cli_base.py
index be399c8..99d610a 100644
--- a/xcli_core/cli_base.py
+++ b/xcli_core/cli_base.py
@@ -102,6 +102,16 @@ class BaseAICLI:
         # Plan 模式状态（只读规划 → 审批 → 执行）
         self.plan_mode = False
         self.current_plan = ""
+        # Agents 管理器（opencode 式 @委派，加载 agents/ 目录下的 *.md）
+        self.agent_manager = None
+        try:
+            from .agent_manager import AgentManager
+            self.agent_manager = AgentManager()
+            agents_dir = os.path.join(project_dir, "agents")
+            os.makedirs(agents_dir, exist_ok=True)
+            self.agent_manager.load_dir(agents_dir)
+        except Exception:
+            self.agent_manager = None
 
         # 获取 skills 目录路径
         skills_dir = os.path.join(project_dir, "skills")
@@ -395,6 +405,47 @@ class BaseAICLI:
         self.current_model = name
         print(f"{Fore.GREEN}已添加并切换到模型: {name}{Style.RESET_ALL}")
 
+    # ── Provider 抽象层（opencode 式原生多 Provider）──
+    def handle_providers_command(self, args):
+        """处理 /providers 命令：列出已注册 Provider 与配置状态。
+
+        /providers           列出全部内置 Provider 及是否已配置 key
+        /providers <名称>    显示该 Provider 的连接参数（base_url / model / 协议）
+        """
+        from xcli_core.provider_router import (
+            list_providers, provider_summary, resolve_provider, PROVIDER_PRESETS,
+        )
+        try:
+            cfg = load_config() or {}
+        except Exception:
+            cfg = {}
+        providers_cfg = cfg.get("providers", {}) if isinstance(cfg, dict) else {}
+
+        if args:
+            name = args.split()[0]
+            preset = PROVIDER_PRESETS.get(name)
+            if not preset:
+                print(f"{Fore.RED}未知 Provider: {name}（/providers 查看可用）{Style.RESET_ALL}")
+                return
+            r = resolve_provider(name, providers_cfg)
+            print(f"{Fore.GREEN}Provider: {preset['label']} ({name}){Style.RESET_ALL}")
+            print(f"  协议族: {r['protocol']}")
+            print(f"  base_url: {r['base_url']}")
+            print(f"  默认模型: {r['model']}")
+            print(f"  已配置 key: {'是' if r['api_key'] else '否'}")
+            print(f"{Fore.CYAN}在 config.json 的 providers.{name} 填入 {{api_key, base_url, model}} 即可启用；"
+                  f"OpenAI 兼容族经现有 openai 引擎直接可用。{Style.RESET_ALL}")
+            return
+
+        print(f"{Fore.GREEN}已注册 Provider（opencode 式多 Provider）:{Style.RESET_ALL}")
+        for name in list_providers():
+            s = provider_summary(name, providers_cfg)
+            if not s:
+                continue
+            mark = f"{Fore.GREEN}✓ 已配置{Style.RESET_ALL}" if s["configured"] else f"{Fore.YELLOW}· 未配置{Style.RESET_ALL}"
+            print(f"  {s['name']:<10} {s['label']:<22} [{s['protocol']:<9}] {mark}")
+        print(f"{Fore.CYAN}/providers <名称> 查看连接参数 ｜ 在 config.json 的 providers 段填入 key 启用{Style.RESET_ALL}")
+
     # ── 引擎切换 ──
 
     def get_available_engines(self):
diff --git a/xcli_core/cli_core.py b/xcli_core/cli_core.py
index 4afee71..c8e125a 100644
--- a/xcli_core/cli_core.py
+++ b/xcli_core/cli_core.py
@@ -1062,6 +1062,44 @@ multi 操作支持一次修改多处：
                   f"完成后用 {Fore.WHITE}/build{Style.RESET_ALL} 批准执行，或 "
                   f"{Fore.WHITE}/plan off{Style.RESET_ALL} 取消。{Style.RESET_ALL}")
 
+    def handle_agent_command(self, arg: str):
+        """@<agent名> <任务> 委派给指定 agent 独立执行。"""
+        mgr = getattr(self, 'agent_manager', None)
+        if mgr is None:
+            print(f"{Fore.RED}Agents 管理器未初始化{Style.RESET_ALL}")
+            return
+        if not arg:
+            names = mgr.names()
+            if names:
+                print(f"{Fore.CYAN}可用 Agents: {', '.join(names)}{Style.RESET_ALL}")
+            else:
+                print(f"{Fore.YELLOW}暂无 agent 定义（在 agents/ 目录放置 *.md）{Style.RESET_ALL}")
+            return
+        parts = arg.split(maxsplit=1)
+        name = parts[0]
+        task = parts[1] if len(parts) > 1 else ""
+        agent = mgr.get(name)
+        if not agent:
+            print(f"{Fore.RED}未找到 agent: {name}{Style.RESET_ALL}")
+            return
+        print(f"{Fore.CYAN}委派给 agent「{agent.name}」: {task}{Style.RESET_ALL}")
+        try:
+            result = mgr.dispatch(name, task, self._agent_runner)
+        except Exception as e:
+            print(f"{Fore.RED}agent 执行失败: {e}{Style.RESET_ALL}")
+            return
+        print(f"{Fore.GREEN}{result}{Style.RESET_ALL}")
+
+    def _agent_runner(self, system_prompt, task, tools, model):
+        """agent 执行器：用当前引擎跑一轮独立上下文（不污染主会话）。"""
+        engine = getattr(self, 'current_engine', None) or getattr(self, 'engine', None)
+        if engine is None:
+            return "错误：当前无可用的 AI 引擎"
+        prompt = task
+        if system_prompt:
+            prompt = f"{system_prompt}\n\n---\n用户任务：\n{task}"
+        return engine.generate_response(prompt, system_prompt=system_prompt)
+
     def handle_build_command(self):
         """处理 /build 命令。从 PLAN 模式进入执行（用已批准计划驱动）。"""
         plan = getattr(self, 'current_plan', '') or ""
@@ -1203,6 +1241,11 @@ multi 操作支持一次修改多处：
                     print(f"{Fore.GREEN}再见!{Style.RESET_ALL}")
                     break
 
+                # @agent 委派（opencode 式 Agents 体系化）
+                if user_input.startswith('@'):
+                    self.handle_agent_command(user_input[1:].strip())
+                    continue
+
                 if user_input == '/help':
                     self.show_help()
                     continue
@@ -1235,6 +1278,11 @@ multi 操作支持一次修改多处：
                     self.handle_model_command(user_input[7:].strip())
                     continue
 
+                # /providers — opencode 式原生多 Provider 注册与状态一览
+                if user_input == '/providers' or user_input.startswith('/providers '):
+                    self.handle_providers_command(user_input[11:].strip())
+                    continue
+
                 # /plan 进入 PLAN 模式（只读规划 → 审批 → 执行）
                 if user_input == '/plan' or user_input.startswith('/plan '):
                     sub = user_input[6:].strip() if user_input.startswith('/plan ') else ''
diff --git a/xcli_core/provider_router.py b/xcli_core/provider_router.py
new file mode 100644
index 0000000..81fb6b8
--- /dev/null
+++ b/xcli_core/provider_router.py
@@ -0,0 +1,269 @@
+"""
+Provider 抽象层（opencode 式原生多 Provider 路由）
+
+小狸核心引擎是 OpenAI 兼容的 OpenaiAI（已支持 base_url，讯飞/xunfei 即借此接入）。
+本模块在此基础上提供：
+  - PROVIDER_PRESETS：主流 Provider 的默认 base_url / 模型前缀 / 协议族
+  - resolve_provider()：从 config["providers"] 解析出 {api_key, base_url, model, headers}
+  - convert_messages() / convert_tools()：OpenAI ↔ Anthropic ↔ Google 线缆格式互转（纯函数）
+  - list_providers()：给 /providers 命令用的汇总
+
+设计原则：纯函数 + 配置驱动，不触网、不强求真实 key，不改动现有 engine 行为。
+真实调用仍由 OpenaiAI 在用户填入 base_url/api_key 后完成（OpenAI 兼容族直接可用；
+非兼容族可借助 convert_* 在 engine 层二次适配，本模块只负责「翻译」与「注册」）。
+"""
+from __future__ import annotations
+
+import os
+from typing import Any, Dict, List, Optional
+
+# ───────────────────────── Provider 预设 ─────────────────────────
+# protocol: openai 兼容 | anthropic | google
+PROVIDER_PRESETS: Dict[str, Dict[str, Any]] = {
+    "openai": {
+        "label": "OpenAI",
+        "base_url": "https://api.openai.com/v1",
+        "protocol": "openai",
+        "models": ["gpt-4o", "gpt-4o-mini", "o1", "o3-mini"],
+        "env_key": "OPENAI_API_KEY",
+    },
+    "anthropic": {
+        "label": "Anthropic Claude",
+        "base_url": "https://api.anthropic.com/v1",
+        "protocol": "anthropic",
+        "models": ["claude-opus-4", "claude-sonnet-4", "claude-3-5-sonnet"],
+        "env_key": "ANTHROPIC_API_BASE",
+    },
+    "google": {
+        "label": "Google Gemini",
+        "base_url": "https://generativelanguage.googleapis.com/v1beta/openai",
+        "protocol": "google",
+        "models": ["gemini-2.0-pro", "gemini-2.0-flash", "gemini-1.5-pro"],
+        "env_key": "GEMINI_API_KEY",
+    },
+    "deepseek": {
+        "label": "DeepSeek",
+        "base_url": "https://api.deepseek.com/v1",
+        "protocol": "openai",
+        "models": ["deepseek-chat", "deepseek-reasoner"],
+        "env_key": "DEEPSEEK_API_KEY",
+    },
+    "moonshot": {
+        "label": "Moonshot (Kimi)",
+        "base_url": "https://api.moonshot.cn/v1",
+        "protocol": "openai",
+        "models": ["moonshot-v1-8k", "moonshot-v1-32k"],
+        "env_key": "MOONSHOT_API_KEY",
+    },
+    "qwen": {
+        "label": "阿里通义千问",
+        "base_url": "https://dashscope.aliyuncs.com/compatible-mode/v1",
+        "protocol": "openai",
+        "models": ["qwen-max", "qwen-plus", "qwen-turbo"],
+        "env_key": "DASHSCOPE_API_KEY",
+    },
+    "xunfei": {
+        "label": "讯飞开放平台",
+        "base_url": "https://spark-api-open.xf-yun.com/v1",
+        "protocol": "openai",
+        "models": ["generalv3.5", "generalv4"],
+        "env_key": "XUNFEI_API_KEY",
+    },
+    "ollama": {
+        "label": "Ollama (本地)",
+        "base_url": "http://localhost:11434/v1",
+        "protocol": "openai",
+        "models": ["qwen2.5", "llama3.1", "deepseek-r1"],
+        "env_key": "",
+    },
+}
+
+# 协议族 → 该族内「消息格式」标识（转换时使用）
+_PROTOCOL_FORMAT = {
+    "openai": "openai",
+    "anthropic": "anthropic",
+    "google": "google",
+}
+
+
+def get_provider_preset(name: str) -> Optional[Dict[str, Any]]:
+    return PROVIDER_PRESETS.get(name)
+
+
+def list_providers() -> List[str]:
+    return list(PROVIDER_PRESETS.keys())
+
+
+def resolve_provider(name: str, providers_cfg: Optional[Dict[str, Any]] = None,
+                     env: Optional[Dict[str, str]] = None) -> Dict[str, Any]:
+    """从 config["providers"][name] 解析出连接参数。
+
+    优先级：providers_cfg 显式字段 > 环境变量 > 预设默认值。
+    返回：{name, label, base_url, api_key, model, protocol, headers}
+    缺失 api_key 时 api_key 为空字符串（调用层据此判断是否配置完成）。
+    """
+    preset = PROVIDER_PRESETS.get(name)
+    if preset is None:
+        return {}
+    env = env if env is not None else dict(os.environ)
+    cfg = (providers_cfg or {}).get(name, {}) if providers_cfg else {}
+
+    api_key = cfg.get("api_key") or (env.get(preset["env_key"]) if preset["env_key"] else "")
+    base_url = cfg.get("base_url") or preset["base_url"]
+    model = cfg.get("model") or (preset["models"][0] if preset["models"] else "")
+    protocol = preset["protocol"]
+
+    headers: Dict[str, str] = {}
+    # Anthropic 需要 beta header与协议版本（即便走 OpenAI 代理也保留以便真实适配）
+    if protocol == "anthropic":
+        headers["anthropic-version"] = "2023-06-01"
+    # Google 的 Gemini OpenAI 兼容端点需要把 key 放 query/header，这里统一放 header
+    if protocol == "google" and api_key:
+        headers["x-goog-api-key"] = api_key
+
+    return {
+        "name": name,
+        "label": preset["label"],
+        "base_url": base_url,
+        "api_key": api_key or "",
+        "model": model,
+        "protocol": protocol,
+        "headers": headers,
+    }
+
+
+def _wire_format(protocol: str) -> str:
+    return _PROTOCOL_FORMAT.get(protocol, "openai")
+
+
+# ───────────────────────── 消息格式互转 ─────────────────────────
+def convert_messages(target: str, messages: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    """把小狸内部 OpenAI 风格 messages 转换为 target provider 的线缆格式。
+
+    target ∈ {"openai", "anthropic", "google"}
+    内部统一表示：[{"role": "system"|"user"|"assistant"|"tool", "content": ..., "tool_calls"?, "name"?}]
+    - anthropic：system 抽成顶层；user/assistant 交替，content 包装为 blocks
+    - google：system 抽成 systemInstruction；content 包装为 parts
+    纯转换，不调用网络。
+    """
+    fmt = _wire_format(target) if target in _PROTOCOL_FORMAT.values() else _wire_format(target)
+    if fmt == "openai":
+        return [_normalize_openai(m) for m in messages]
+    if fmt == "anthropic":
+        return _to_anthropic(messages)
+    if fmt == "google":
+        return _to_google(messages)
+    return [_normalize_openai(m) for m in messages]
+
+
+def _normalize_openai(m: Dict[str, Any]) -> Dict[str, Any]:
+    """确保 content 为字符串（统一线缆格式），保留 role/tool_calls/name。"""
+    out = {"role": m.get("role", "user")}
+    content = m.get("content")
+    if content is None:
+        content = ""
+    if isinstance(content, list):
+        # 多模态 blocks → 拼接文本
+        text = "".join(p.get("text", "") for p in content if isinstance(p, dict))
+        content = text
+    out["content"] = content
+    if "tool_calls" in m:
+        out["tool_calls"] = m["tool_calls"]
+    if "name" in m:
+        out["name"] = m["name"]
+    return out
+
+
+def _to_anthropic(messages: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    """Anthropic Messages API 格式：system 单独抽离，消息为 user/assistant 交替。"""
+    out: List[Dict[str, Any]] = []
+    for m in messages:
+        role = m.get("role")
+        if role == "system":
+            continue  # 顶层 system 由调用方单独处理
+        content = m.get("content", "")
+        blocks = []
+        if isinstance(content, list):
+            for p in content:
+                if isinstance(p, dict) and p.get("type") == "text":
+                    blocks.append({"type": "text", "text": p.get("text", "")})
+                elif isinstance(p, dict) and p.get("type") == "image":
+                    blocks.append(p)
+        else:
+            blocks.append({"type": "text", "text": str(content)})
+        out.append({"role": "user" if role in ("user", "tool") else "assistant",
+                    "content": blocks})
+    return out
+
+
+def _to_google(messages: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    """Google Gemini 格式：system 抽为 systemInstruction，消息为 content.parts。"""
+    out: List[Dict[str, Any]] = []
+    for m in messages:
+        role = m.get("role")
+        if role == "system":
+            continue
+        content = m.get("content", "")
+        parts = []
+        if isinstance(content, list):
+            for p in content:
+                if isinstance(p, dict) and p.get("type") == "text":
+                    parts.append({"text": p.get("text", "")})
+                elif isinstance(p, dict) and p.get("type") == "image":
+                    parts.append(p)
+        else:
+            parts.append({"text": str(content)})
+        out.append({"role": "user" if role in ("user", "tool") else "model",
+                    "parts": parts})
+    return out
+
+
+def convert_tools(target: str, tools: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
+    """把 OpenAI FC tools([{type, function:{name,description,parameters}}]) 转目标格式。
+
+    - openai：原样
+    - anthropic：tools=[{name, description, input_schema}]
+    - google：tools=[{functionDeclarations:[{name,description,parameters}]}]
+    """
+    fmt = _wire_format(target)
+    if fmt == "openai":
+        return tools
+    if fmt == "anthropic":
+        out = []
+        for t in tools:
+            fn = t.get("function", {})
+            out.append({
+                "name": fn.get("name", ""),
+                "description": fn.get("description", ""),
+                "input_schema": fn.get("parameters", {"type": "object", "properties": {}}),
+            })
+        return out
+    if fmt == "google":
+        decls = []
+        for t in tools:
+            fn = t.get("function", {})
+            decls.append({
+                "name": fn.get("name", ""),
+                "description": fn.get("description", ""),
+                "parameters": fn.get("parameters", {"type": "object", "properties": {}}),
+            })
+        return [{"functionDeclarations": decls}] if decls else []
+    return tools
+
+
+def provider_summary(name: str, providers_cfg: Optional[Dict[str, Any]] = None,
+                     env: Optional[Dict[str, str]] = None) -> Dict[str, Any]:
+    """给 /providers 命令用的单条汇总（是否配置、协议、模型数）。"""
+    preset = PROVIDER_PRESETS.get(name)
+    if not preset:
+        return {}
+    resolved = resolve_provider(name, providers_cfg, env)
+    configured = bool(resolved.get("api_key"))
+    return {
+        "name": name,
+        "label": preset["label"],
+        "protocol": preset["protocol"],
+        "configured": configured,
+        "model_count": len(preset["models"]),
+        "base_url": resolved.get("base_url", ""),
+    }