ServiceNow MCP Server

Instructions

Implementation Reference

• src/servicenow_mcp/tools/change_tools.py:860-958 (handler)

  The reject_change function implements the core logic for rejecting a ServiceNow change request by updating the approval record to 'rejected' and setting the change request state to 'canceled'.
  def reject_change( auth_manager: AuthManager, server_config: ServerConfig, params: Dict[str, Any], ) -> Dict[str, Any]: """ Reject a change request in ServiceNow. Args: auth_manager: The authentication manager. server_config: The server configuration. params: The parameters for rejecting a change request. Returns: The result of the rejection. """ # Unwrap and validate parameters result = _unwrap_and_validate_params( params, RejectChangeParams, required_fields=["change_id", "rejection_reason"] ) if not result["success"]: return result validated_params = result["params"] # Get the instance URL instance_url = _get_instance_url(auth_manager, server_config) if not instance_url: return { "success": False, "message": "Cannot find instance_url in either server_config or auth_manager", } # Get the headers headers = _get_headers(auth_manager, server_config) if not headers: return { "success": False, "message": "Cannot find get_headers method in either auth_manager or server_config", } # First, find the approval record approval_query_url = f"{instance_url}/api/now/table/sysapproval_approver" query_params = { "sysparm_query": f"document_id={validated_params.change_id}", "sysparm_limit": 1, } try: approval_response = requests.get(approval_query_url, headers=headers, params=query_params) approval_response.raise_for_status() approval_result = approval_response.json() if not approval_result.get("result") or len(approval_result["result"]) == 0: return { "success": False, "message": "No approval record found for this change request", } approval_id = approval_result["result"][0]["sys_id"] # Now, update the approval record to rejected approval_update_url = f"{instance_url}/api/now/table/sysapproval_approver/{approval_id}" headers["Content-Type"] = "application/json" approval_data = { "state": "rejected", "comments": validated_params.rejection_reason, } approval_update_response = requests.patch(approval_update_url, json=approval_data, headers=headers) approval_update_response.raise_for_status() # Finally, update the change request state to "canceled" change_url = f"{instance_url}/api/now/table/change_request/{validated_params.change_id}" change_data = { "state": "canceled", # This may vary depending on ServiceNow configuration "work_notes": f"Change request rejected: {validated_params.rejection_reason}", } change_response = requests.patch(change_url, json=change_data, headers=headers) change_response.raise_for_status() return { "success": True, "message": "Change request rejected successfully", } except requests.exceptions.RequestException as e: logger.error(f"Error rejecting change: {e}") return { "success": False, "message": f"Error rejecting change: {str(e)}", }
• src/servicenow_mcp/tools/change_tools.py:99-105 (schema)

  Pydantic model defining the input parameters for the reject_change tool, including required change_id and rejection_reason.
  class RejectChangeParams(BaseModel): """Parameters for rejecting a change request.""" change_id: str = Field(..., description="Change request ID or sys_id") approver_id: Optional[str] = Field(None, description="ID of the approver") rejection_reason: str = Field(..., description="Reason for rejection")
• src/servicenow_mcp/utils/tool_utils.py:528-534 (registration)

  Registration of the reject_change tool in the get_tool_definitions dictionary, mapping the tool name to its handler, schema, description, and serialization method.
  "reject_change": ( reject_change_tool, RejectChangeParams, str, "Reject a change request", "str", # Tool returns simple message ),