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

Direct Access
Direct access to official project resources and documentation
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Claude Code v2.1.287 release
github.com/anthropics/claude-code/releases/tag/v2.1.287
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Mods overview — Claude Code Docs
code.claude.com/docs/en/plugins/mods/overview
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Create a mod
code.claude.com/docs/en/plugins/mods/create
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Claude Code changelog
code.claude.com/docs/en/changelog
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npm @anthropic-ai/claude-code
www.npmjs.com/package/@anthropic-ai/claude-code
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Agent SDK TypeScript v0.3.287
github.com/anthropics/claude-agent-sdk-typescript/releases/tag/v0.3.287
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Manage mods for your organization
code.claude.com/docs/en/plugins/mods/admin
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In-Depth Technical Analysis

Core Background & Industry Pain Points

Claude Code plugins used to extend from the outside (skills, MCP, settings hooks). v2.1.287 (2026-10-01) ships Claude Mods: in-process JS/TS handlers that observe, rewrite, or answer events. Read the Mods overview and changelog.

Architecture Highlights & Internals

A mod is a plugin with a hooks module (register.js) for events like tool.call and ui.render: draw panes/bands, restyle tool rows/spinners, guard or reroute tool calls, or add instant /commands. Built-in opt-in You should know (/plugin enable cc-plugin-you-should-know@builtin) runs a side agent that surfaces missed risks on longer tasks (first-party + telemetry). Also: MCP 2025-11-25 URL elicitation; Opus 4.7+ / Fable default to 1M context on Bedrock/Vertex/Foundry/apps gateway (CLAUDE_CODE_DISABLE_1M_CONTEXT=1 keeps 200K).

Authoritative Benchmarks & Measured Scores

No official SWE-bench/TTFT numbers—do not invent scores. Anchors: GitHub v2.1.287 (~2026-10-01T18:00:22Z); Agent SDK TS v0.3.287; Mods need ≥2.1.287 (on by default). Mods run with your privileges—validate with claude plugin validate before install.

Developer Hands-on Guide

Upgrade to 2.1.287; check /plugin for active mods; enable You should know if desired; follow Create-a-mod docs; org admins use managed mods settings; fix MCP auth disconnects with elicitation / bareElicitationCapability.

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