Chat, sessions, models, and file controls

Choose a conversation and model, give the assistant context, queue instructions, and navigate its replies.

9 min readUpdated Nov 1, 2026

Step-by-step guidance.

Before you start

Open the named screen in Rumata. Available controls may depend on your account, permissions, and resource state.

A session is a conversation with its own history. The assistant still works in the same factory.

Control	What it does
Main agent / session row	Open that conversation. The selected row is highlighted.
Sub-agent row	Inspect a child conversation created by the assistant. Its indentation identifies its parent.
New Session / Create session / plus	Open a dialog for a new conversation.
Session name / Create Session	Enter a name of up to 120 characters, then create the session. The name cannot be empty.
Rename session / Save Name	Rename a main session. Child sessions do not show the same rename action.
Cancel / dialog X	Close the create or rename dialog without applying the pending name.
Latest	Jump to the newest messages.
Previous user messages markers	Jump back to one of your earlier prompts.
Fork	Create a new session branching from that point in the conversation.

Describe the outcome you want in everyday language. Technical users can add exact files, interfaces, and acceptance criteria.

Control	What it does
Take screenshot	When supported by the browser, choose a display source and capture a PNG as a pending attachment. The capture stream stops afterward. Review the image for private data and send the prompt separately; capture alone does not submit it.
Message field / Enter / Shift+Enter	Write your request. Enter sends it; Shift+Enter inserts a new line.
Plan / Build / agent selector	Choose an available assistant mode. Plan develops an approach for review; Build carries out changes. Available choices depend on the factory’s agent runtime.
Model selector	Choose a model from the available provider groups. Connected providers appear first; the image icon identifies models with image input support.
Default / Current / Use runtime default label	Check which model is in use when you haven’t selected one explicitly. The label can reflect factory settings or the session’s current model.
Send	Submit the prompt, selected references, attachments, and command. While a response is running, a new message can enter the Up next queue.
Stop	Ask the assistant to stop its current response. It appears while work is running and the composer is empty. Changes already made are not rolled back.
Up next → Move back to composer	Remove that instruction from the pending queue and return it to the input for editing.
Up next → Steer	Send a queued instruction into the current response when the runtime supports steering.

A reference points the assistant to existing project context. A local attachment supplies a file from your computer.

Control	What it does
@ / Search skills or files…	Open and search the reference picker from the message field.
File or skill result	Add the selected reference to the pending prompt. Choosing a reference alone does not send the prompt.
Reference chip → X	Remove that reference from the pending prompt.
/ / Search commands…	Find commands available in the current agent runtime. Read the description before selecting one.
Command result / Arguments field	Select a command, then provide the arguments it expects. Send executes the selected command.
Command chip → X	Remove the selected command. If the command was typed directly in the message rather than picked, this action clears that typed prompt.
Add to chat → Upload from computer	Choose up to six local files for the prompt. Each prepared attachment must fit within 1 MiB; non-image files above that limit are rejected.
Attachment chip → X	Remove a file from the unsent prompt. Selecting files does not upload them into the factory’s storage bucket.

Expandable activity cards explain what the assistant attempted and what the tool returned.

Control	What it does
Copy below a message	Copy the message text.
Tool activity / reasoning / task-list disclosure	Expand or collapse details such as input, output, errors, reasoning text, or the assistant’s task list. Expanding does not rerun the tool.
Preview telemetry disclosure	Inspect preview network and console context attached to the conversation.
Image attachment	Open a larger image view. Close the dialog to return to the chat.
Other file attachment	Open its file link in a new tab.
Recognized workspace file link	Open that file in Code, at the supplied position when available. Code access depends on the plan and project setup state.
MCPs Connected	Inspect the services available to the assistant and whether each is connected, disabled, failed, or needs authentication or registration.