v1.2.0

[Nikita Lipsky (pjBooms)]

Release Summary

Compose Hot Reload 1.2.0 is here 🎉.

This release introduces a Model Context Protocol (MCP) server that enables AI agents to interact with a running Compose application in real time.

Highlights

• 🤖 New MCP server for AI agent integration
• ☕ JBR 25 by default, with a configurable minimum version
• 🧯 Richer error reporting in the dev tools

MCP Server

The new hot-reload-mcp module exposes a Model Context Protocol server through the hotMcpServer Gradle task. The server connects to a running Compose app, waits for startup, detects shutdowns, and reconnects automatically. Any MCP-compatible AI agent can use it to inspect and control the application:

Tool	Description
status	View app and reload state, including details of the last error
reload / await_reload	Trigger a hot reload and wait for it to complete
restart / reset_ui	Restart the app or reset its running UI
take_screenshot	Capture a screenshot, optionally saving it to a specified path
list_windows / resize_window	Inspect and resize application windows
get_semantic_tree	Read the semantic tree, including Dialog, ModalBottomSheet, and Popup elements
get_ui_error / get_logs	Read the current UI error and application logs
click, type_text, scroll, …	Simulate user interactions

Dev Tools

• Reload failures now include detailed error information, shown in the notification overlay with the Copy and Copy path to file actions.
• Multi-window support: fixed the hot reload panel becoming non-interactive in multi-window mode.

JBR & Gradle

• The default runtime is now JBR 25. Use the compose.reload.jbr.min.version property to configure the minimum supported JBR version.
• Unsafe incremental compilation is now disabled by default for multiplatform projects. Opt in with compose.reload.gradle.build.optimize.unsafe=true.

Thanks to everyone who filed issues, tested pre-releases, and contributed to this release 🙏

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This discussion was created from the release v1.2.0.