diff --git a/langgraph_qwen/__init__.py b/langgraph_qwen/__init__.py
new file mode 100644
index 0000000..9559f2b
--- /dev/null
+++ b/langgraph_qwen/__init__.py
@@ -0,0 +1,29 @@
+"""
+Lightweight adapter to use Qwen3-Coder(-Flash) models with LangGraph via
+LangChain ChatModels. Focuses on an OpenAI-compatible path and a clean
+factory API, plus helpers for tool binding and streaming examples.
+
+Usage quickstart:
+
+    from langgraph_qwen.factory import get_qwen_chat_model
+    from langgraph.prebuilt import create_react_agent
+
+    model = get_qwen_chat_model()
+    agent = create_react_agent(model, tools=[...])
+
+Environment variables:
+- QWEN_API_KEY: API key for OpenAI-compatible endpoint (or DashScope)
+- QWEN_BASE_URL: Base URL (e.g. https://dashscope-intl.aliyuncs.com/compatible-mode/v1)
+- QWEN_MODEL: Model name (e.g. qwen3-coder-flash)
+"""
+
+__all__ = [
+    "get_qwen_chat_model",
+    "bind_qwen_tools",
+    "ChatQwenOpenAICompat",
+    "create_qwen_react_agent",
+]
+
+from .factory import get_qwen_chat_model, bind_qwen_tools
+from .chat_model import ChatQwenOpenAICompat
+from .prebuilt import create_qwen_react_agent
diff --git a/langgraph_qwen/chat_model.py b/langgraph_qwen/chat_model.py
new file mode 100644
index 0000000..b22f4b6
--- /dev/null
+++ b/langgraph_qwen/chat_model.py
@@ -0,0 +1,414 @@
+from __future__ import annotations
+
+import json
+import os
+from dataclasses import dataclass, field
+from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple
+from langchain_core.language_models.chat_models import BaseChatModel
+from .utils import ensure_env_loaded
+try:
+    # pydantic v2
+    from pydantic import PrivateAttr
+except Exception:  # pragma: no cover
+    # pydantic v1 fallback
+    from pydantic.fields import PrivateAttr  # type: ignore
+
+
+def _env(name: str, default: Optional[str] = None) -> Optional[str]:
+    v = os.getenv(name)
+    return v if v else default
+
+
+def _coalesce(*vals):
+    for v in vals:
+        if v is not None:
+            return v
+    return None
+
+
+def _to_openai_messages(messages: List["BaseMessage"]) -> List[Dict[str, Any]]:
+    from langchain_core.messages import (
+        AIMessage,
+        BaseMessage,
+        HumanMessage,
+        SystemMessage,
+        ToolMessage,
+        FunctionMessage,
+    )
+
+    out: List[Dict[str, Any]] = []
+    for m in messages:
+        if isinstance(m, SystemMessage):
+            out.append({"role": "system", "content": m.content})
+        elif isinstance(m, HumanMessage):
+            out.append({"role": "user", "content": m.content})
+        elif isinstance(m, AIMessage):
+            # If previous AI produced tool calls, pass them through
+            entry: Dict[str, Any] = {"role": "assistant", "content": m.content}
+            tcs = getattr(m, "tool_calls", None) or m.additional_kwargs.get("tool_calls") if hasattr(m, "additional_kwargs") else None
+            if tcs:
+                # Map to OpenAI's expected shape
+                entry["tool_calls"] = [
+                    {
+                        "id": tc.get("id") if isinstance(tc, dict) else getattr(tc, "id", None),
+                        "type": "function",
+                        "function": {
+                            "name": (tc.get("name") if isinstance(tc, dict) else getattr(tc, "name", "")) or "",
+                            "arguments": json.dumps(tc.get("args") if isinstance(tc, dict) else getattr(tc, "args", {})),
+                        },
+                    }
+                    for tc in (tcs or [])
+                ]
+            out.append(entry)
+        elif isinstance(m, ToolMessage):
+            # OpenAI-compatible "tool" role with name + id must be provided
+            out.append(
+                {
+                    "role": "tool",
+                    "content": m.content,
+                    "tool_call_id": m.tool_call_id,
+                }
+            )
+        elif isinstance(m, FunctionMessage):
+            # Legacy function messages
+            out.append(
+                {
+                    "role": "tool",
+                    "content": m.content,
+                    "tool_call_id": m.name or "",
+                }
+            )
+        else:
+            # Fallback
+            out.append({"role": getattr(m, "role", "user"), "content": getattr(m, "content", str(m))})
+    return out
+
+
+def _convert_tool(tool: Any) -> Dict[str, Any]:
+    """Best-effort conversion to OpenAI tool schema."""
+    # Prefer built-in conversion if available
+    if hasattr(tool, "to_openai_tool"):
+        try:
+            return tool.to_openai_tool()  # type: ignore[attr-defined]
+        except Exception:
+            pass
+    name = getattr(tool, "name", None) or getattr(tool, "__name__", "tool")
+    description = getattr(tool, "description", "")
+    # Attempt to get a JSON schema
+    params: Dict[str, Any] = {"type": "object", "properties": {}, "required": []}
+    schema = None
+    if hasattr(tool, "args_schema") and getattr(tool, "args_schema") is not None:
+        try:
+            schema = tool.args_schema.schema()  # pydantic v1
+        except Exception:
+            try:
+                schema = tool.args_schema.model_json_schema()  # pydantic v2
+            except Exception:
+                schema = None
+    if schema is None and hasattr(tool, "args"):
+        try:
+            schema = tool.args
+        except Exception:
+            schema = None
+    if isinstance(schema, dict):
+        params = schema
+    return {
+        "type": "function",
+        "function": {
+            "name": name,
+            "description": description,
+            "parameters": params,
+        },
+    }
+
+
+def _convert_tools(tools: Optional[List[Any]]) -> Optional[List[Dict[str, Any]]]:
+    if not tools:
+        return None
+    return [_convert_tool(t) for t in tools]
+
+
+def _parse_tool_calls(msg: Dict[str, Any]) -> Tuple[str, List[Dict[str, Any]]]:
+    content = _coalesce(msg.get("content"), "")
+    tool_calls_raw = msg.get("tool_calls") or []
+    parsed: List[Dict[str, Any]] = []
+    for tc in tool_calls_raw:
+        fn = (tc or {}).get("function", {})
+        name = fn.get("name") or ""
+        args_str = fn.get("arguments") or "{}"
+        args = {}
+        if isinstance(args_str, str):
+            try:
+                args = json.loads(args_str or "{}")
+            except Exception:
+                # keep raw if malformed; downstream may repair
+                args = {"$raw": args_str}
+        elif isinstance(args_str, dict):
+            args = args_str
+        parsed.append({
+            "id": tc.get("id"),
+            "name": name,
+            "args": args,
+        })
+    return content, parsed
+
+
+@dataclass
+class _ToolCallBuilder:
+    id: Optional[str] = None
+    name: str = ""
+    args_buf: List[str] = field(default_factory=list)
+
+    def to_final(self) -> Dict[str, Any]:
+        args_str = "".join(self.args_buf) if self.args_buf else "{}"
+        try:
+            args = json.loads(args_str or "{}")
+        except Exception:
+            args = {"$raw": args_str}
+        return {"id": self.id, "name": self.name, "args": args}
+
+
+class ChatQwenOpenAICompat(BaseChatModel):
+    """
+    A minimal LangChain BaseChatModel-compatible class that calls an
+    OpenAI-compatible /chat/completions endpoint and assembles tool calls.
+
+    Notes:
+    - Implements _generate for non-stream and _stream for SSE streaming.
+    - Stores bound tools and tool_choice to send with requests.
+    - Avoids heavy dependencies; uses httpx at runtime.
+    """
+
+    # Private state to avoid pydantic field validation
+    _model: str = PrivateAttr()
+    _api_key: str = PrivateAttr()
+    _base_url: str = PrivateAttr()
+    _temperature: Optional[float] = PrivateAttr(default=None)
+    _max_tokens: Optional[int] = PrivateAttr(default=None)
+    _extra_body: Dict[str, Any] = PrivateAttr(default_factory=dict)
+    _timeout: float = PrivateAttr(default=60.0)
+    _tools: Optional[List[Dict[str, Any]]] = PrivateAttr(default=None)
+    _tool_choice: Optional[str] = PrivateAttr(default=None)
+
+    def __init__(
+        self,
+        *,
+        model: Optional[str] = None,
+        api_key: Optional[str] = None,
+        base_url: Optional[str] = None,
+        temperature: Optional[float] = None,
+        max_tokens: Optional[int] = None,
+        extra_body: Optional[Dict[str, Any]] = None,
+        timeout: float = 60.0,
+    ) -> None:
+        super().__init__()
+        # Load .env variables once if available
+        ensure_env_loaded()
+        # Store config in private attrs
+        self._model = model or _env("QWEN_MODEL", "qwen3-coder-flash")
+        self._api_key = (
+            api_key
+            or _env("QWEN_API_KEY")
+            or _env("GPUSTACK_API_KEY")
+            or _env("OPENAI_API_KEY")
+            or _env("DASHSCOPE_API_KEY")
+        )
+        if not self._api_key:
+            raise ValueError("Missing API key: set QWEN_API_KEY/OPENAI_API_KEY/DASHSCOPE_API_KEY")
+        self._base_url = base_url or _env("QWEN_BASE_URL") or _env("OPENAI_BASE_URL")
+        if not self._base_url:
+            # Default to DashScope intl OpenAI-compatible
+            self._base_url = "https://dashscope-intl.aliyuncs.com/compatible-mode/v1"
+        # Allow env override for timeout
+        timeout_env = _env("QWEN_TIMEOUT")
+        if timeout_env:
+            try:
+                timeout = float(timeout_env)
+            except Exception:
+                pass
+        self._temperature = temperature
+        self._max_tokens = max_tokens
+        self._extra_body = extra_body or {}
+        self._timeout = timeout
+        # tools/tool_choice already defaulted via PrivateAttr declarations
+
+    # Expose LangChain binding-style API
+    def bind_tools(self, tools: List[Any]) -> "ChatQwenOpenAICompat":
+        clone = self._copy()
+        clone._tools = _convert_tools(tools)
+        return clone
+
+    def bind(self, **kwargs: Any) -> "ChatQwenOpenAICompat":
+        clone = self._copy()
+        # Allow passing tool_choice or extra_body overrides
+        if "tool_choice" in kwargs:
+            clone._tool_choice = kwargs["tool_choice"]
+        if "extra_body" in kwargs and isinstance(kwargs["extra_body"], dict):
+            eb = dict(clone._extra_body)
+            eb.update(kwargs["extra_body"])  # type: ignore
+            clone._extra_body = eb
+        return clone
+
+    # LangChain BaseChatModel required interface
+    @property
+    def _llm_type(self) -> str:  # type: ignore[override]
+        return "qwen-openai-compat"
+
+    def _copy(self) -> "ChatQwenOpenAICompat":
+        c = ChatQwenOpenAICompat(
+            model=self._model,
+            api_key=self._api_key,
+            base_url=self._base_url,
+            temperature=self._temperature,
+            max_tokens=self._max_tokens,
+            extra_body=dict(self._extra_body),
+            timeout=self._timeout,
+        )
+        c._tools = self._tools[:] if self._tools else None
+        c._tool_choice = self._tool_choice
+        return c
+
+    # -- Internal HTTP helpers --
+    def _request(self, payload: Dict[str, Any], *, stream: bool = False) -> Any:
+        try:
+            import httpx
+        except Exception as e:
+            raise RuntimeError("httpx is required for ChatQwenOpenAICompat. Install via `pip install httpx`. ") from e
+
+        # Auth header customization (for non-standard gateways)
+        auth_header = _env("QWEN_AUTH_HEADER", "Authorization")
+        auth_scheme = _env("QWEN_AUTH_SCHEME", "Bearer")
+        auth_value = f"{auth_scheme} {self._api_key}" if auth_scheme else self._api_key
+        headers = {auth_header: auth_value, "Content-Type": "application/json"}
+        base = self._base_url.rstrip("/")
+        # Accept either a root base_url (ending with /v1) or a full endpoint that already includes /chat/completions
+        if "chat/completions" in base:
+            url = base
+        else:
+            url = base + "/chat/completions"
+        # Proxy behavior: honor env by default; allow disabling via QWEN_HTTP_TRUST_ENV=0
+        trust_env = _env("QWEN_HTTP_TRUST_ENV", "1") != "0"
+        client = httpx.Client(timeout=self._timeout, trust_env=trust_env)
+        if _env("QWEN_DEBUG") == "1":
+            import sys as _sys
+            print(f"[qwen] POST {url} timeout={self._timeout} trust_env={trust_env}", file=_sys.stderr)
+        if stream:
+            return client.stream("POST", url, headers=headers, json=payload)
+        resp = client.post(url, headers=headers, json=payload)
+        resp.raise_for_status()
+        return resp.json()
+
+    def _build_payload(self, messages: List["BaseMessage"], **kwargs: Any) -> Dict[str, Any]:
+        payload: Dict[str, Any] = {
+            "model": self._model,
+            "messages": _to_openai_messages(messages),
+        }
+        if self._temperature is not None:
+            payload["temperature"] = self._temperature
+        if self._max_tokens is not None:
+            payload["max_tokens"] = self._max_tokens
+        if self._tools:
+            payload["tools"] = self._tools
+        if self._tool_choice is not None:
+            payload["tool_choice"] = self._tool_choice
+        if self._extra_body:
+            payload.update(self._extra_body)
+        if kwargs:
+            payload.update(kwargs)
+        return payload
+
+    # -- Non-streaming generate --
+    def _generate(
+        self,
+        messages: List["BaseMessage"],
+        stop: Optional[List[str]] = None,
+        run_manager: Optional[Any] = None,
+        **kwargs: Any,
+    ) -> "ChatResult":  # type: ignore[name-defined]
+        from langchain_core.outputs import ChatGeneration, ChatResult
+        from langchain_core.messages import AIMessage
+
+        payload = self._build_payload(messages, **kwargs)
+        data = self._request(payload, stream=False)
+        choice = (data.get("choices") or [{}])[0]
+        msg = choice.get("message", {})
+        content, tool_calls = _parse_tool_calls(msg)
+        usage = data.get("usage", {})
+
+        extra_kwargs = {
+            "raw": data,
+            "reasoning_content": msg.get("reasoning_content"),
+        }
+        msg_kwargs: Dict[str, Any] = {"content": content or "", "additional_kwargs": extra_kwargs}
+        if tool_calls:
+            msg_kwargs["tool_calls"] = tool_calls
+        ai = AIMessage(**msg_kwargs)
+        gen = ChatGeneration(message=ai)
+        return ChatResult(generations=[gen], llm_output={"usage": usage, "model": data.get("model")})
+
+    # -- Streaming generate --
+    def _stream(
+        self,
+        messages: List["BaseMessage"],
+        stop: Optional[List[str]] = None,
+        run_manager: Optional[Any] = None,
+        **kwargs: Any,
+    ) -> Iterator["ChatGenerationChunk"]:  # type: ignore[name-defined]
+        from langchain_core.outputs import ChatGenerationChunk
+        from langchain_core.messages import AIMessageChunk
+
+        payload = self._build_payload(messages, stream=True, **kwargs)
+        with self._request(payload, stream=True) as r:  # type: ignore[attr-defined]
+            # SSE stream; lines like: data: {...}\n\n; end with data: [DONE]
+            text_buf: List[str] = []
+            tc_builders: List[_ToolCallBuilder] = []
+            for line in r.iter_lines():  # type: ignore[attr-defined]
+                if not line:
+                    continue
+                if isinstance(line, (bytes, bytearray)):
+                    try:
+                        line = line.decode("utf-8", errors="ignore")
+                    except Exception:
+                        continue
+                if not line.startswith("data:"):
+                    continue
+                data = line[len("data:"):].strip()
+                if data == "[DONE]":
+                    # Finalize: emit a chunk with final tool calls if any
+                    if tc_builders or text_buf:
+                        extra: Dict[str, Any] = {}
+                        if tc_builders:
+                            extra["tool_calls"] = [b.to_final() for b in tc_builders]
+                        final = AIMessageChunk(
+                            content="".join(text_buf) if text_buf else "",
+                            additional_kwargs=extra if extra else None,
+                        )
+                        yield ChatGenerationChunk(message=final)
+                    break
+                try:
+                    obj = json.loads(data)
+                except Exception:
+                    continue
+                choices = obj.get("choices") or []
+                if not choices:
+                    continue
+                delta = (choices[0].get("delta") or {})
+                # Text deltas
+                dtext = delta.get("content")
+                if dtext:
+                    text_buf.append(dtext)
+                    yield ChatGenerationChunk(message=AIMessageChunk(content=dtext))
+                # Tool call deltas
+                dtools = delta.get("tool_calls") or []
+                for i, part in enumerate(dtools):
+                    # Ensure list length
+                    while len(tc_builders) <= i:
+                        tc_builders.append(_ToolCallBuilder())
+                    b = tc_builders[i]
+                    if "id" in part:
+                        b.id = part.get("id") or b.id
+                    fn = part.get("function") or {}
+                    if fn.get("name"):
+                        b.name = fn["name"]
+                    if fn.get("arguments"):
+                        b.args_buf.append(fn["arguments"])  # partial JSON string
diff --git a/langgraph_qwen/factory.py b/langgraph_qwen/factory.py
new file mode 100644
index 0000000..ba2d803
--- /dev/null
+++ b/langgraph_qwen/factory.py
@@ -0,0 +1,135 @@
+import os
+from typing import Any, Dict, List, Optional
+from .utils import ensure_env_loaded
+
+
+def _env(var: str, default: Optional[str] = None) -> Optional[str]:
+    v = os.getenv(var)
+    return v if v is not None and v != "" else default
+
+
+def get_qwen_chat_model(
+    *,
+    model: Optional[str] = None,
+    api_key: Optional[str] = None,
+    base_url: Optional[str] = None,
+    temperature: Optional[float] = None,
+    max_tokens: Optional[int] = None,
+    extra: Optional[Dict[str, Any]] = None,
+    prefer: str = "openai_compat",
+):
+    """
+    Return a LangChain ChatModel configured for Qwen3-Coder(-Flash).
+
+    Tries the OpenAI-compatible client (langchain_openai.ChatOpenAI) by default.
+    If unavailable and prefer != 'openai_compat', will try DashScope
+    (langchain_community.chat_models.tongyi.ChatTongyi).
+
+    This function does not import heavy deps at module import time; imports are
+    local to keep repo light.
+    """
+
+    model = model or _env("QWEN_MODEL", "qwen3-coder-flash")
+    # Load .env variables once if available
+    ensure_env_loaded()
+    api_key = (
+        api_key
+        or _env("QWEN_API_KEY")
+        or _env("GPUSTACK_API_KEY")
+        or _env("OPENAI_API_KEY")
+        or _env("DASHSCOPE_API_KEY")
+    )
+    base_url = base_url or _env("QWEN_BASE_URL") or _env("OPENAI_BASE_URL")
+
+    # Common generation params
+    gen_kwargs: Dict[str, Any] = {}
+    if temperature is not None:
+        gen_kwargs["temperature"] = temperature
+    if max_tokens is not None:
+        gen_kwargs["max_tokens"] = max_tokens
+    if extra:
+        gen_kwargs.update(extra)
+
+    err: Optional[Exception] = None
+
+    if prefer == "custom":
+        try:
+            from .chat_model import ChatQwenOpenAICompat
+
+            if api_key is None:
+                api_key = (
+                    _env("QWEN_API_KEY")
+                    or _env("GPUSTACK_API_KEY")
+                    or _env("OPENAI_API_KEY")
+                    or _env("DASHSCOPE_API_KEY")
+                )
+            chat = ChatQwenOpenAICompat(
+                model=model,
+                api_key=api_key,
+                base_url=base_url,
+                **gen_kwargs,
+            )
+            return chat
+        except Exception as e:
+            raise RuntimeError(f"Custom adapter init failed: {e}")
+
+    if prefer == "openai_compat":
+        try:
+            from langchain_openai import ChatOpenAI  # type: ignore
+
+            if api_key is None:
+                raise ValueError("QWEN_API_KEY/OPENAI_API_KEY/DASHSCOPE_API_KEY is required")
+
+            # ChatOpenAI supports base_url override for OpenAI-compatible servers
+            chat = ChatOpenAI(
+                model=model,
+                api_key=api_key,
+                base_url=base_url,
+                **gen_kwargs,
+            )
+            return chat
+        except Exception as e:
+            err = e
+
+    # Fallback: DashScope (Tongyi) path via community provider
+    try:
+        from langchain_community.chat_models.tongyi import ChatTongyi  # type: ignore
+
+        # ChatTongyi uses DASHSCOPE_API_KEY from env by default; api_key arg optional
+        chat = ChatTongyi(
+            model=model,
+            dashscope_api_key=api_key,
+            **gen_kwargs,
+        )
+        return chat
+    except Exception as e2:
+        raise RuntimeError(
+            "Failed to create Qwen ChatModel. Tried OpenAI-compatible and DashScope paths.\n"
+            f"Prefer='" + prefer + "' error: " + (str(err) if err else "None") + "\n" +
+            "DashScope path error: " + str(e2)
+        )
+
+
+def bind_qwen_tools(
+    model, tools: List[Any], *, tool_choice: Optional[str] = None
+):
+    """
+    Bind tools to a LangChain ChatModel with Qwen-friendly defaults.
+
+    - tools: list of BaseTool or functions decorated with @tool
+    - tool_choice: 'auto' | 'required' | tool-name | None
+    Returns: a model instance with bound tools.
+    """
+
+    # Many LangChain chat models implement .bind_tools(...)
+    # We keep this thin and rely on LangChain's native tool schema handling.
+    bound = model.bind_tools(tools)
+    if tool_choice is not None:
+        # Some providers accept tool_choice via .bind; others via gen kwargs
+        # We try to set it via .bind when available.
+        try:
+            bound = bound.bind(tool_choice=tool_choice)
+        except Exception:
+            # If provider doesn't accept bind(tool_choice=..), attach to kwargs
+            bound = bound.bind(extra_body={"tool_choice": tool_choice})
+    return bound
diff --git a/langgraph_qwen/prebuilt.py b/langgraph_qwen/prebuilt.py
new file mode 100644
index 0000000..6b21914
--- /dev/null
+++ b/langgraph_qwen/prebuilt.py
@@ -0,0 +1,36 @@
+from typing import Any, Dict, Iterable, List, Optional
+
+from .factory import get_qwen_chat_model, bind_qwen_tools
+from .validators import validate_tool_names, ToolValidationError
+
+
+def create_qwen_react_agent(
+    tools: List[Any],
+    *,
+    model: Optional[Any] = None,
+    prefer: str = "custom",
+    tool_choice: Optional[str] = "auto",
+    model_kwargs: Optional[Dict[str, Any]] = None,
+    enforce_tool_name_check: bool = True,
+    **agent_kwargs: Any,
+):
+    """
+    Sugar around langgraph.prebuilt.create_react_agent configured for Qwen.
+
+    - If `model` is None, constructs one via get_qwen_chat_model(prefer=..., **model_kwargs).
+    - Binds tools and applies `tool_choice`.
+    - Returns a LangGraph ReAct agent ready to invoke/stream.
+    """
+
+    from langgraph.prebuilt import create_react_agent as _create
+
+    model_kwargs = model_kwargs or {}
+
+    # Strictly validate tool names before binding, if enabled
+    if enforce_tool_name_check:
+        validate_tool_names(tools, strict=True)
+    if model is None:
+        model = get_qwen_chat_model(prefer=prefer, **model_kwargs)
+
+    model = bind_qwen_tools(model, tools, tool_choice=tool_choice)
+    return _create(model, tools, **agent_kwargs)
diff --git a/langgraph_qwen/utils.py b/langgraph_qwen/utils.py
new file mode 100644
index 0000000..4bafe21
--- /dev/null
+++ b/langgraph_qwen/utils.py
@@ -0,0 +1,22 @@
+_DOTENV_LOADED = False
+
+
+def ensure_env_loaded() -> None:
+    global _DOTENV_LOADED
+    if _DOTENV_LOADED:
+        return
+    try:
+        # Lazy import to avoid hard failure if not installed
+        from dotenv import load_dotenv, find_dotenv  # type: ignore
+
+        path = find_dotenv(usecwd=True)
+        if path:
+            load_dotenv(dotenv_path=path, override=False)
+        else:
+            # Fall back to default discovery in CWD
+            load_dotenv(override=False)
+    except Exception:
+        # Silently ignore if python-dotenv is not available or errors out
+        pass
+    _DOTENV_LOADED = True
+
diff --git a/langgraph_qwen/validators.py b/langgraph_qwen/validators.py
new file mode 100644
index 0000000..f050853
--- /dev/null
+++ b/langgraph_qwen/validators.py
@@ -0,0 +1,67 @@
+import re
+import hashlib
+from typing import Iterable, List, Tuple, Any
+
+
+TOOL_NAME_PATTERN = re.compile(r"^[a-zA-Z0-9_-]{1,64}$")
+
+
+class ToolValidationError(Exception):
+    pass
+
+
+def sanitize_tool_name(name: str, max_len: int = 64) -> str:
+    safe = re.sub(r"[^a-zA-Z0-9_-]", "_", name or "tool")
+    if len(safe) > max_len:
+        suffix = hashlib.sha1(safe.encode()).hexdigest()[:8]
+        safe = safe[: max_len - 9] + "_" + suffix
+    return safe or "tool"
+
+
+def _find_illegal_chars(name: str) -> List[str]:
+    return sorted(list(set(re.findall(r"[^a-zA-Z0-9_-]", name))))
+
+
+def _get_name(obj: Any) -> str:
+    return getattr(obj, "name", None) or getattr(obj, "tool_name", None) or getattr(obj, "__name__", "tool")
+
+
+def validate_tool_names(
+    tools: Iterable[Any], *, strict: bool = True, max_len: int = 64
+) -> Tuple[bool, List[str]]:
+    """
+    Validate that tool names conform to OpenAI-compatible constraints:
+    - Allowed chars: a-z, A-Z, 0-9, underscore, hyphen
+    - Max length: 64
+
+    Returns (ok, messages). If strict=True and invalid tools exist,
+    raises ToolValidationError with a detailed report.
+    """
+    messages: List[str] = []
+    errors: List[str] = []
+    for idx, t in enumerate(tools):
+        name = _get_name(t)
+        if TOOL_NAME_PATTERN.match(name or ""):
+            continue
+        parts: List[str] = [f"第{idx}个工具名称不合法: '{name}'"]
+        if not name:
+            parts.append("原因: 为空")
+        else:
+            illegal = _find_illegal_chars(name)
+            if illegal:
+                parts.append(f"包含非法字符: {''.join(illegal)} (仅允许[a-zA-Z0-9_-])")
+            if len(name) > max_len:
+                parts.append(f"长度超限: {len(name)} > {max_len}")
+        suggestion = sanitize_tool_name(name or "tool", max_len=max_len)
+        parts.append(f"建议名称: '{suggestion}'")
+        errors.append("; ".join(parts))
+
+    if errors:
+        report = "\n".join(errors)
+        messages.append(report)
+        if strict:
+            raise ToolValidationError(report)
+        return False, messages
+
+    return True, messages
+