add skyvern defined error code (#3366)

skyvern/errors/errors.py

@@ -0,0 +1,19 @@
+from pydantic import BaseModel
+
+
+class SkyvernDefinedError(BaseModel):
+    error_code: str
+    reasoning: str
+
+    def __repr__(self) -> str:
+        return f"{self.reasoning}(error_code={self.error_code})"
+
+
+class ReachMaxStepsError(SkyvernDefinedError):
+    error_code: str = "REACH_MAX_STEPS"
+    reasoning: str = "The agent has reached the maximum number of steps."
+
+
+class ReachMaxRetriesError(SkyvernDefinedError):
+    error_code: str = "REACH_MAX_RETRIES"
+    reasoning: str = "The agent has reached the maximum number of retries. It might be an issue with the agent. Please reach out to the Skyvern team for support."