The release adds session notices and context compaction for external agents using ACP. It also adds Gemini 4 Argon to the Google AI provider, plus GPT-6 Astra, Claude Fable 5.1, and Claude Opus 5.5 to the Amazon Bedrock provider.
The notes report binary-size reductions of about 33% on macOS, 28% on Windows, and 7% on Linux. They also describe faster SSH remote connections by detecting the remote shell, platform, and OS version in one command rather than three. Other changes include automatic unfolding when navigating to a code location and an option to apply inlay-hint text edits by double-clicking.
The release fixes a remote-project issue in which environment variables, including secrets, passed to external agents and MCP servers could appear in the local machine's process list. It also fixes cases where agent prompts were slow or failed to send because of unnecessary Git checkpoints. The source does not establish the vulnerability's severity, affected deployment scope, exploitability, or whether v1.25.0-pre is a general-availability release.