Add local repository MCP server

labyricorn_mcp/errors.py

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+"""Structured errors safe to return to MCP clients."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass
+class LabyricornMcpError(Exception):
+    code: str
+    message: str
+    details: dict[str, Any] = field(default_factory=dict)
+
+    def __str__(self) -> str:
+        return self.message
+
+    def as_dict(self) -> dict[str, Any]:
+        result: dict[str, Any] = {"code": self.code, "message": self.message}
+        if self.details:
+            result["details"] = self.details
+        return result
+
+
+def require(condition: bool, code: str, message: str, **details: Any) -> None:
+    if not condition:
+        raise LabyricornMcpError(code, message, details)