diff --git a/astrbot/core/agent/mcp_client.py b/astrbot/core/agent/mcp_client.py
index dad9e5be4e..9d179f5009 100644
--- a/astrbot/core/agent/mcp_client.py
+++ b/astrbot/core/agent/mcp_client.py
@@ -679,6 +679,30 @@ async def cleanup(self) -> None:
         self.running_event.set()
 
 
+
+def clean_tool_name(server_name: str, tool_name: str, max_length: int = 64) -> str:
+    """构建前缀化的 MCP 工具名，确保兼容 LLM API 的命名规范。
+
+    LLM API（OpenAI、Anthropic、Gemini 等）的工具名只允许
+    [a-zA-Z0-9_-] 字符，且通常限制 64 字符。
+
+    使用双下划线 __ 作为分隔符，并对非法字符做清洗而非报错，
+    让工具在多数场景下仍可正常工作。
+    """
+    safe_server = re.sub(r"[^a-zA-Z0-9_\-]", "_", server_name)
+    safe_tool = re.sub(r"[^a-zA-Z0-9_\-]", "_", tool_name)
+    prefixed = f"{safe_server}__{safe_tool}"
+    if len(prefixed) > max_length:
+        # 优先截断工具名部分
+        excess = len(prefixed) - max_length
+        if len(safe_tool) > excess + 3:
+            safe_tool = safe_tool[:len(safe_tool) - excess - 3] + "..."
+        else:
+            safe_tool = safe_tool[:max(3, len(safe_tool) - excess)]
+        prefixed = f"{safe_server}__{safe_tool}"
+    return prefixed
+
+
 class MCPTool(FunctionTool, Generic[TContext]):
     """A function tool that calls an MCP service."""
 
@@ -686,7 +710,7 @@ def __init__(
         self, mcp_tool: mcp.Tool, mcp_client: MCPClient, mcp_server_name: str, **kwargs
     ) -> None:
         super().__init__(
-            name=mcp_tool.name,
+            name=clean_tool_name(mcp_server_name, mcp_tool.name),
             description=mcp_tool.description or "",
             parameters=_normalize_mcp_input_schema(mcp_tool.inputSchema),
         )
diff --git a/astrbot/dashboard/services/tools_service.py b/astrbot/dashboard/services/tools_service.py
index efd487185d..a6aba04a62 100644
--- a/astrbot/dashboard/services/tools_service.py
+++ b/astrbot/dashboard/services/tools_service.py
@@ -4,7 +4,7 @@
 from typing import Any
 
 from astrbot.core import logger, sp
-from astrbot.core.agent.mcp_client import MCPTool, validate_mcp_stdio_config
+from astrbot.core.agent.mcp_client import MCPTool, clean_tool_name, validate_mcp_stdio_config
 from astrbot.core.core_lifecycle import AstrBotCoreLifecycle
 from astrbot.core.star import star_map
 from astrbot.core.tools.registry import get_builtin_tool_config_statuses
@@ -79,7 +79,10 @@ def get_mcp_servers(self) -> list[dict]:
                 for name_key, runtime in self.tool_mgr.mcp_server_runtime_view.items():
                     if name_key == name:
                         mcp_client = runtime.client
-                        server_info["tools"] = [tool.name for tool in mcp_client.tools]
+                        server_info["tools"] = [
+                            clean_tool_name(name, tool.name)
+                            for tool in mcp_client.tools
+                        ]
                         server_info["errlogs"] = mcp_client.server_errlogs
                         break
                 else: