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Chat

The left chat panel is how you steer Mythex.

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What Mythex can do

Inside your private project workspace, Mythex can:

• Create and edit files
• Install packages
• Run commands in the terminal
• Inspect errors and iterate
• Use project tools exposed by the platform
• Look at images you attach (screenshots, mockups, error screens)

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Build, Plan, and Ask

In the workspace, choose a mode: Use Plan when the change is ambiguous or risky. Use Ask for explanations or “what does this do?” without changing files. Use Build when you want Mythex to execute. Everyone uses the same Standard coding agent. There is no Standard / Pro model picker in chat.

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Multiple chats (threads)

Each project can have more than one chat thread — useful for separate topics (e.g. “auth refactor” vs “marketing page”) without mixing history.

• New chat — + next to the tab bar starts a fresh thread in the same project (up to 10 open tabs)
• Switch threads — click a tab; close a tab with × (does not delete the thread)
• Chat history — clock icon opens past threads; open, rename, or delete a thread from there

Deleting a thread removes its messages permanently. All threads share the same project files and preview.

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Empty chat

On a new thread, starter chips (for example Portfolio site, SaaS landing page, To-do app) fill the composer — they do not send until you confirm. If no tabs are open, New chat or Open history starts or reopens a thread.

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Stop a run

While the agent is working, click Stop to cancel the current run. You can send a new message after it stops.

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Edit and resend

Hover an earlier user message to edit it. Confirming Discard & resend rewinds the project to before that turn (when a checkpoint exists) and sends the new prompt — useful when a turn went the wrong direction.

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Checkpoints / restore

After a successful agent turn, Mythex saves a git checkpoint. Use Restore on that assistant turn to roll the project files back to that point.

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Live progress

Runs stream live updates. Leave the tab open during a run so you can steer with follow-ups after it finishes.

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Follow-up queue

You can send another message while the agent is still working. It appears as N Queued above the composer. Expand the list to Edit, Send now, or Remove an item.

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Switch to Plan

If the agent wants to plan before editing, a Switch to Plan card appears. Switch (or ⌘/Ctrl+Enter) continues in Plan mode; Skip (Esc) stays in the current mode. The bar under the reason is a countdown: leave it alone and the turn switches to Plan by itself, so asking for a plan in Build mode still gets you one.

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Ask questions

Sometimes the agent needs a product choice. An Ask questions panel appears above the composer: pick an option, type a custom answer, then Continue. Use Previous / Next on multi-step questions, or Skip. Until you answer, the agent is waiting on you.

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Connection errors

If a turn fails to send, a helper banner may show Try again (⌘/Ctrl+Enter).

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Plan card

After a plan is ready, View Plan opens a read-only plan tab. Build starts implementing it. See Subagents. The plan tab shows the whole approach — sections, content and the step checklist — and carries its own Build button, so you can read it through and start from there.

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Attachments

Logged-in users can attach images and files from:

• The project workspace chat
• The home / dashboard composer (attachments carry into the first chat turn when you create a project)

Limits: up to 5 files per message, 10 MB each. Images show as thumbnails; other files as chips. Guests must sign in before attaching. Useful for “make it look like this” or sharing an error screenshot so the agent can see the UI.

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Commands

In the workspace chat, use Commands for common platform actions (you can also ask in plain language):

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Tips

• One clear goal per message beats a long wish list
• Point at what you see in Preview (“the hero button is cut off on phone”)
• Prefer small follow-ups over restarting the whole app
• Attach a screenshot when words alone are ambiguous

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Related

• Subagents
• Voice input
• Secrets in chat
• App Testing
• Effective prompts
• Iterate
• Workspace overview
• Database
• File storage
• Plans