Runcell releases

Release 0.1.22 / 0.1.23

release date: 2026-04-28

0.1.23 is a hotfix released within a few hours of 0.1.22, so the two releases are documented together here.

New features:

Parallel Agent conversations — The headline feature of 0.1.22. You can now run multiple Agent-mode conversations in parallel, so a second conversation can work on task B while the first one is still busy with task A. Running several Agents side by side meaningfully improves throughput when you have multiple things going on at once. A couple of practical notes:
- We recommend avoiding having multiple Agents operate on the same notebook at the same time.
- Agent conversations are isolated from each other to prevent cross-task conflicts.
Relaxed default Shell permissions — Once you've approved a permission, similar Shell calls will no longer keep asking for it. In practice this means far fewer interruptions when the AI uses Shell Execute frequently, especially for basic read-only commands, which are now open to the Agent by default.
Offline / detached Agent tasks — Once an Agent task has started, it will keep running even if the notebook is closed or refreshed. This prevents long-running tasks from being interrupted just because a tab was reloaded or closed.
URL fetch tool — You can now paste URLs directly into the conversation and the Agent will read and understand the page content. This is great for pointing the Agent at specific documentation pages or other reference websites.

Bug fixes:

Fixed high latency in several tool calls.
Fixed an issue where the Agent would occasionally insert cells at the wrong position.
Fixed missing "currently streaming" prompt indicators in the Chat UI in certain situations.
Fixed the model list not updating automatically.
(0.1.23) Fixed a chat-merging issue between parallel Agent conversations that could occur depending on the timing of when conversations were created.

release date: 2026-04-03

Added Compact for long-running conversations. When a model's context gets close to its limit, Runcell can now compress the conversation context to keep the session moving instead of forcing you to restart or lose momentum. We currently support both Manual Compact and Auto Compact, so you can either decide when to compress or let Runcell handle it automatically.
Added parallel tool calling. This significantly improves how fast the Agent can read and understand large, complex codebases by working across multiple tools at the same time, which makes deep repository analysis much more responsive in real-world engineering workflows.
Improved Agent mode performance, with better overall responsiveness, lower latency, and more stable network behavior during longer sessions.
Fixed missing History backup timing, making backups more reliable and reducing the chance of losing important session history.
Fixed a large-file write issue, so write-file operations are now more stable when working with bigger files.
Polished a number of UI details for a smoother overall experience.

release date: 2026-03-08

Fixed an issue where text content was being truncated when file editing and read/write tools processed excessively large files.
Resolved an "Authentication Error" (specifically occurring under certain unique conditions).
Added support for Shell Execute, providing finer-grained control over command-line tool instructions.
Added support for new models, including GPT-5.4 and GPT Codex 5.3.
Runcell now can read and understand images/visual content on local devices/in notebook.
Better Agent context and better tools for agent to understand notebook(.ipynb) content

release date: 2026-02-19

Fix compatibility with interactive charts libraries, like Plotly, Vega Altair or even ipywidgets.
Runcell Agent now can understand visual elements from plotly, vega altair and lots of ipywidgets instead of regarding them as html.
New upgrade tool, which allow user can one click to finish upgrade + restart jupyter
New model support - Sonnet 4.6, Gemini 3.1 Pro, GLM 5, MiniMax 2.5 are now available.
Fix credits remain display bug
Fix file system tools result with large content waste the context window of AI agent.

release date: 2026-02-10

Pause/Resume for agents — The agent can now be paused and resumed, which means it can handle long-running tools (model training, large database queries, scripts that take hours) without hitting timeout issues. This was a known bug in earlier versions.
Permission controls for tool calls — runcell now asks for your approval before executing actions like running code, bash commands, or installing dependencies. This gives you more control over what the agent does. It's fully configurable — you can choose between manual approval or letting it act directly.
New model support — Opus 4.6, Codex 5.2, and Kimi 2.5 are now available.

release date: 2026-01-12

release date: 2025-12-28