Agent Breaking Changes_

← Cline

Cline Desktop v0.0.40

2026-09-30 · official notes

Summary

• Custom providers added with Add Provider now work when you run a task. They showed up in the provider and model pickers but failed with Unknown or disabled provider
• New chats remember whether you last used Cloud or Local, and which Cloud model you picked, instead of always going back to Local. Switching a thread from Local to Cloud also opens on your remembered C
• Saving provider credentials no longer fails when the provider's model list can't be fetched, and the model list refreshes when you change a provider's API key or endpoint

Full notes

- Custom providers added with **Add Provider** now work when you run a task. They showed up in the provider and model pickers but failed with `Unknown or disabled provider`
- New chats remember whether you last used **Cloud** or **Local**, and which Cloud model you picked, instead of always going back to Local. Switching a thread from Local to Cloud also opens on your remembered Cloud model
- Saving provider credentials no longer fails when the provider's model list can't be fetched, and the model list refreshes when you change a provider's API key or endpoint
- MCP settings always use the same file. With `CLINE_MCP_SETTINGS_PATH`, `CLINE_DATA_DIR`, or `CLINE_DIR` set, reading and saving servers, MCP OAuth sign-in, and **Open MCP settings** now all use that path, where some could open a different file before
- Tool diffs now follow the app's font size setting instead of a fixed 13px
- When an MCP tool returns more output than fits in context, the agent can now read the rest. It gets a preview plus a link it can page through, so the output past the cutoff is no longer lost
- Refreshed the model catalog. The Cline recommended list adds GPT-6.1 Sol. Default models change for 302.AI (Claude Sonnet 5.5), NanoGPT (Ling 3.1 Flash), Vivgrid (GPT-6.1 Sol), and Vultr (MiMo V2.6 Flash RL). Vultr's model ids were renamed upstream, so a pinned Vultr model may need to be re-selected

**Full Changelog**: https://github.com/cline/cline/compare/desktop-v0.0.39...desktop-v0.0.40