Versions 2.1.299 and 2.1.300, dated October 14, 2026, added prompt media and session identity functions for managed mods, prompt decorations, a prompt.change hook, and the ability for an agent.spawn hook to rewrite a workflow agent’s prompt and model.
Version 2.1.304, dated October 19, added a transcript entry when a plugin skips a mod hook. Its tool.check event gained decider: "person" and e.isReadOnly; the former limits approval to the permission dialog or a host callback. The release also changed settings.read hooks to receive individual settings layers and added mod rendering in the VS Code chat panel for Bedrock, Vertex AI, Foundry, LLM-gateway, and telemetry-disabled sessions.
Version 2.1.309 on October 22 fixed a failure in the mod turn.step hook when a model alias such as haiku was used. The current page also lists version 2.1.310, dated October 23. The changelog does not establish which third-party mods are compatible, secure, or generally available across every Claude Code deployment.