First, navigate to the Admin console, and go to the Actions tab. Click the New Action button. Next, specify a OpenAPI 3.0 or OpenAPI 3.1 schema that defines the APIs that you want to make available as part of this action. Onyx provides dynamic context variables that can be utilized within your OpenAPI definition, enhancing the functionality and context-awareness of your custom actions. These variables are:
  • CHAT_SESSION_ID: Replaced with the chat session ID in your action call
  • CHAT_MESSAGE_ID: Replaced with the chat message ID in your action call
For example: /persona/CHAT_SESSION_ID/messages/CHAT_MESSAGE_ID with CHAT_SESSION_ID = 20 and CHAT_MESSAGE_ID = 10 would become /persona/20/messages/10 To improve performance:
  • Add descriptive summarys for each operation (API)
  • Give each operation a descriptive operationId
  • Add descriptions for parameter
For example, you could use the following to create an action that allows an assistant to fetch and create assistants with Onyx: 
{
   "openapi":"3.0.0",
   "info":{
      "version":"1.0.0",
      "title":"Assistants API",
      "description":"An API for managing assistants within Onyx"
   },
   "servers":[
      {
         "url":"http://localhost:8080"
      }
   ],
   "paths":{
      "/persona":{
         "get":{
            "summary":"Get a specific Assistant",
            "operationId":"getAssistant",
            "parameters":[
               {
                  "name":"assistant_id",
                  "in":"path",
                  "required":true,
                  "schema":{
                     "type":"string"
                  }
               }
            ]
         },
         "post":{
            "summary":"Create a new Assistant",
            "operationId":"createAssistant",
            "requestBody":{
               "required":true,
               "content":{
                  "application/json":{
                     "schema":{
                        "type":"object",
                        "properties":{
                           "name":{
                              "type":"string"
                           },
                           "description":{
                              "type":"string"
                           },
                           "num_chunks":{
                              "type":"number"
                           },
                           "llm_relevance_filter":{
                              "type":"boolean"
                           },
                           "is_public":{
                              "type":"boolean"
                           },
                           "llm_filter_extraction":{
                              "type":"boolean"
                           },
                           "recency_bias":{
                              "type":"string",
                              "enum":[
                                 "favor_recent",
                                 "base_decay",
                                 "no_decay",
                                 "auto"
                              ]
                           },
                           "prompt_ids":{
                              "type":"array",
                              "items":{
                                 "type":"integer"
                              }
                           },
                           "document_set_ids":{
                              "type":"array",
                              "items":{
                                 "type":"integer"
                              }
                           },
                           "tool_ids":{
                              "type":"array",
                              "items":{
                                 "type":"integer"
                              }
                           },
                           "llm_model_provider_override":{
                              "type":"string",
                              "nullable":true
                           },
                           "llm_model_version_override":{
                              "type":"string",
                              "nullable":true
                           },
                           "starter_messages":{
                              "type":"array",
                              "items":{
                                 "type":"object",
                                 "properties":{
                                    "role":{
                                       "type":"string"
                                    },
                                    "content":{
                                       "type":"string"
                                    }
                                 }
                              },
                              "nullable":true
                           },
                           "users":{
                              "type":"array",
                              "items":{
                                 "type":"string",
                                 "format":"uuid"
                              },
                              "nullable":true
                           },
                           "groups":{
                              "type":"array",
                              "items":{
                                 "type":"integer"
                              },
                              "nullable":true
                           }
                        },
                        "required":[
                           "name",
                           "description",
                           "num_chunks",
                           "llm_relevance_filter",
                           "is_public",
                           "llm_filter_extraction",
                           "recency_bias",
                           "prompt_ids",
                           "document_set_ids",
                           "tool_ids"
                        ]
                     }
                  }
               }
            }
         }
      }
   }
}