CowAgent Files

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This is a refinement release for the 2.1.8 multi-Agent version, building on it with a series of improvements and fixes across multi-Agent collaboration, model capabilities, and channel integration.

🤝 Multi-Agent Experience

Further polish around using multi-Agent teams:

• Multi-Agent session selection: the in-session multi-Agent selector adds a lead-Agent marker that clearly separates the lead Agent from members, while simplifying the view in single-Agent setups.
• Collaboration fix: fixed failures when delegating tasks from non-lead Agents in multi-Agent group chats, now correctly identifying member Agents.
• Member Agent image rendering: fixed images generated by non-default Agents failing to render on the Web console and desktop client.
• Group-chat entry: the desktop Team page adds a group-chat entry, so you can start a group session directly from an Agent team.

📡 Channel Integration Fixes

Fixed key issues along the console's channel start/stop path for more stable channel integration:

• Desktop channel integration fix: fixed channels failing to start in the desktop client.
• Channel stop fix: fixed a lost app_module lookup during the channel stop flow that caused disconnect errors (a regression introduced by [#3141]).
• QQ channel reconnection: fixed the QQ channel not reconnecting after a silent WebSocket disconnect; it now reconnects automatically.

🤖 Model Capabilities

• Model list configuration: model providers can now configure a model list, setting the model name, model type, context window, max output, and more. Thanks @alanyz106 (#3146)

• Multiple fallback models: when the primary model fails, CowAgent now tries an ordered fallback chain in turn, replacing the previous single fallback model. Thanks @alanyz106 (#3125)

• Fallback credential fix: fixed credential resolution during fallback, which now resolves credentials by the provider actually routed to rather than the global configuration. Thanks @alanyz106 (#3142)
• New image models: added gpt-image-2.5-flare and gpt-image-2.5-sunburst. Thanks @cowagent (#3140)

🛠 Improvements & Fixes

• Config file tolerance: tolerate a UTF-8 BOM in config.json, and stop the pre-login 401 polling to avoid invalid requests before sign-in.
• Image generation fixes:
• fixed Baidu Ernie IMAGE_CREATE crashing when unsupported, now returning an error message instead (Thanks @c020627 [#3144]).
• fixed Midjourney reply retries not recursing into the send logic correctly (Thanks @c020627 [#3151]).
• Voice fix: fixed silk voice transcoding by first decoding silk into a standalone wav and then re-encoding to mp3, avoiding overwriting the source file (Thanks @c020627 [#3149]).
• Media URL classification: determine media type from the resolved URL path, fixing misclassified media links (Thanks @c020627 [#3150]).
• Baidu Translate: fixed Baidu Translate not reporting the API error after all retries failed (Thanks @c020627 [#3147]).
• Background command detection: restrict run_in_background to long-running processes, preventing tasks from being marked complete too early.
• Tool output truncation: report the byte-based truncation reason correctly when kept lines are partially truncated (Thanks @c020627 [#3137]).
• Web mobile layout: improved the console layout on mobile.
• Desktop client: fixed the multi-Agent team menu not showing.

📦 How to Upgrade

• Source deployment: run cow update for a one-click upgrade, or pull the latest code and restart. See the upgrade guide.
• Desktop client: check for updates and update with one click inside the client, or get the latest version from the download page.

Release date: 2026.09.14 | Full Changelog