python: deepseek-harness SDK and runtime carrier packages

python/sdk/src/deepseek_harness/errors.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+
+class HarnessError(Exception):
+    """Base exception for SDK and runtime failures."""
+
+
+class TransportClosedError(HarnessError):
+    """Raised when the runtime subprocess exits or closes stdout."""
+
+
+class JsonRpcError(HarnessError):
+    """Raised when the runtime returns a JSON-RPC error response."""
+
+    def __init__(self, code: int | None, message: str, data: object | None = None) -> None:
+        super().__init__(message)
+        self.code = code
+        self.message = message
+        self.data = data