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Claude Code 2.1.287: Mods in-process extensions; built-in You should know side agent; 1M context default on gateways

Anthropic shipped Claude Code 2.1.287 on 2026-10-01 (npm @anthropic-ai/[email protected]): Claude Mods let plugins run in-process JS/TS hooks that rewrite tool calls and UI; opt-in built-in You should know side agent; MCP URL elicitation; Opus 4.7+/Fable default to 1M context on Bedrock/Vertex/Foundry/apps gateway. Agent SDK TS 0.3.287 parity.

Key Takeaways

Release v2.1.287; npm 2.1.287; GitHub ~2026-10-01T18:00:22Z
Mods: in-process hooks for UI + tool.call rewrite; ≥2.1.287; docs https://code.claude.com/docs/en/plugins/mods/overview
You should know: /plugin enable cc-plugin-you-should-know@builtin (first-party + telemetry); off by default
1M context default for Opus 4.7+/Fable on Bedrock/Vertex/Foundry/apps gateway; disable via CLAUDE_CODE_DISABLE_1M_CONTEXT=1
Agent SDK TS 0.3.287; MCP URL elicitation / bareElicitationCapability

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Linked Models & Agents:

⚡ Claude Opus 5.5 ⚡ Claude Sonnet 5.5 ⚡ Claude Fable 5.1 🤖 Claude Code (Anthropic)🌐 Anthropic

#Claude Code#Mods#You should know#Plugins#MCP elicitation#1M context#Agent SDK#2.1.287

Boris Cherny@bcherny·Collected 52d ago

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Claude Mods are landing in Claude Code: community demos include Tetris-in-Claude; details on GitHub issue

Claude Code lead Boris Cherny (@bcherny) said Claude Mods are landing now. Community demos already include a Tetris-in-Claude mod; latest updates, technical details, and more demos are on anthropics/claude-code GitHub issue #91870.

Key Takeaways

Claude Mods are landing in Claude Code, announced by lead Boris Cherny.
Community demos already include Tetris-in-Claude.
Technical details and updates live on anthropics/claude-code issue #91870.

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Linked Models & Agents:

⚡ Anthropic Claude🤖 Claude Code (Anthropic)🌐 Anthropic

#Claude Mods#Claude Code#Anthropic#Mods#Extensibility