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v2026.6.3

mui/base-uiv2026.6.3Jun 3, 2026by virattt

AI Summary

This release introduces sub-agent delegation and significantly enhances web fetching functionality.

Key Highlights

  • Added `spawn_subagent` for parallel task execution.
  • Enhanced CLI progress UI for sub-agents.
  • Improved `web_fetch` with HTML-to-markdown conversion and caching.

New Features

  • Sub-agent delegation system
  • CLI subagent progress UI
  • Enhanced web fetching (Readability/Turndown, Caching, Extraction)

Full Release Notes

### Changes

- Add `spawn_subagent` to delegate focused sub-tasks to isolated workers (`general-purpose`, `research`, `analysis`); emit multiple calls in one turn to run independent tasks in parallel
- Add CLI subagent progress UI with per-delegate status, tool-use counts, and rolled-up activity
- Improve `web_fetch` with Readability/Turndown HTML-to-markdown, HTTP caching, and fast-model extraction from fetched pages