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# v0.4.3 — Intelligent subagents, grep, shell tools, and more

Released February 20, 2026

## Highlights

* Subagents: The main AI can spin up parallel agents to research your codebase or execute complex tasks in the background. And big improvements to core tools.
* Grep tools: Fast code search across your project with ripgrep
* Shell tools: Run commands with user approval for full control
* Improved tool calling: Smarter edit flow, strReplace, glob, and unified diff preview
* Bulk asset import: Import villages, forests, or cities in one batch
* Import reliability: Assets appear immediately without tab switching

## Changes

Added
* Subagent architecture: Orchestrator delegates to specialized background agents
* Explore subagent: Rapid codebase discovery with ripgrep and file tools
* Grep tools for AI code search across the project
* Shell command execution with user approval
* strReplace for surgical edits, glob for file discovery
* importAssets and ImportFromUrlBatch for bulk asset imports

Improved
* Tool calling: AI chooses the right tool (strReplace vs replaceText vs writeFile)
* Unified edit preview with accept/reject controls
* ImportFromUrl uses scan\_changes so assets appear immediately
* Historical chats no longer re-run operations when browsing
* macOS installer: signed and notarized, export templates bundled

Fixed
* File reading reliability when working in another tab
* Import recursion and cache errors for new directories

Source: https://www.summerengine.com/changelog/0.4.3

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## Machine-readable resources

- Site index for agents: https://www.summerengine.com/llms.txt
- Full inlined content: https://www.summerengine.com/llms-full.txt
- Porting catalog: https://www.summerengine.com/llms-porting.txt
- Structured catalog: https://www.summerengine.com/agent-catalog.json
- Sitemap: https://www.summerengine.com/sitemap.xml
- Developer resources: https://www.summerengine.com/docs