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Claude Code Mods let plugins reshape the agent, with an opt-in side agent to catch misses

Claude Code 2.1.287 adds Mods: JavaScript or TypeScript handlers that can add interface panes and commands or intercept session events. The release also adds You should know, an opt-in side agent for first-party sessions with telemetry enabled. Mods run with user privileges; the docs explicitly warn that they can reach secrets and approve tool calls. This is deeper customization, not a sandboxed prompt pack.

Published Updated 4 sources

Primary source

Anthropic GitHub · October 1, 2026

Read the original: Claude Code 2.1.287 release

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