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docs: Claude Code v2.1.318 - Bash hooks now fire on Monitor commands, subagents fail instead of silently swapping models, SDK reloadPlugins() - #1439

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docs/claude-code-v2.1.318-20261106-0731
Nov 6, 2026
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docs/claude-code-v2.1.318-20261106-0731

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Night shift report

WHY THIS MATTERS: The version is still 2.1.318, but its docs caught up with behavior changes that affect existing setups. A PreToolUse/PermissionRequest hook with a Bash matcher now also runs on Monitor tool commands, but it can only deny or ask, never allow or rewrite. If your hook auto-approves Bash, it silently does nothing for Monitor unless you add Bash|Monitor. Since v2.1.318, a subagent that hits a flagged request now fails under "Ask each time" instead of quietly re-running on the fallback model. Also since v2.1.318, starting claude in an IDE terminal no longer installs the extension. If you've built tooling around hooks, subagents, or IDE setup, read this.

HIGHLIGHTS:

  • Hooks: new "Match Monitor commands" section (hooks.md, agent-sdk/hooks.md, v2.1.314+). A Bash matcher catches Monitor calls with deny/ask only. Use Bash|Monitor or .* and Monitor(tail *) in if to allow or rewrite them.
  • Hooks: PreCompact stdout is now documented as instructions for the compaction summary (10,000-character cap per hook). There's also a new auth_storage_failure notification matcher (v2.1.288+).
  • Subagent model fallback behavior change (v2.1.318) (model-config.md). Under "Ask each time", subagents now fail with Agent terminated early due to an API error. Before, they re-ran on the fallback model.
  • IDE extension is no longer auto-installed on claude startup (v2.1.318). Only /ide installs it now (autoInstallIdeExtension, CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL).
  • Agent SDK:
    • TypeScript Query.reloadPlugins() reloads plugins mid-session. Python users send /reload-plugins as a prompt instead.
    • New SDKMessageOrigin docs: human, peer, unclassified, scheduled-trigger task notifications, and fromMode for cross-session peers. The SDK must set origin: {kind: "human"} for the ultracode keyword check to accept the prompt.
    • New sandbox option ignoreViolations in both SDKs.
  • Permissions gotcha documented. Write(path), Glob(path) and Grep(path) rules are accepted but never match. A Grep(docs/**) deny does not stop Grep, so use Edit/Read rules instead.
  • Code Review: subdirectory REVIEW.md files. They're honored on protected branches, share a 150KB budget, and are ignored under test/example/vendor/generated directory names.
  • Errors: the single "didn't send your claude.ai login" message (before v2.1.315) is now three distinct messages, each with admin troubleshooting steps.
  • Fast mode: fastModePerSessionOptIn and saved-preference semantics are clarified. Only Opus 5.5 / 5 / 4.8 support it, and running /fast on another model switches you to Opus.
  • Self-hosted environments: you can now pin a permission mode (for example, auto) and pre-approve tools from your wrapper script. Claude Apps Gateway docs add a load_test_mode and Claude Desktop admin UI for spend limits.
  • Claude Projects: an "Auto-continue when usage limits reset" setting, on by default, means threads resume and spend your next usage window.
  • Admin/Analytics API:
    • New chat_cowork_unified product surface, plus per-surface DAU/WAU/MAU and skill/connector/plugin counts for Chat and Cowork unified.
    • The user sign-out endpoint docs are fleshed out with SDK/CLI examples (anthropic-beta: admin-user-sign-out-2026-10-08).
    • Rate Limits and User Management pages are reworked (cursor vs ID pagination, rlg_ group IDs).
  • New official plugins in claude-plugins-official: champion-kit (adoption plays, hackathon and office-hours skills for Claude Code champions) and receipts (a personal Claude Code impact report from your session transcripts). The LSP plugins also gained .claude-plugin/ manifests.
  • Noise: about 330 API SDK reference pages (Ruby, Java, Go, etc.) churned from regeneration, mostly re-rendered enabled/defer_loading tool fields and advisor table reflow. Government and third-party desktop docs and about 20 support articles were refreshed.
  • No deletions. tombstones.json and discovery.json only changed their timestamps, so no new deaths, resurrections, or sources.

Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning

… subagents fail instead of silently swapping models, SDK reloadPlugins()

Co-Authored-By: claude-yolo[bot] <claude-yolo@lroole.com>
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claude-yolo Bot merged commit 9919ae3 into main Nov 6, 2026
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claude-yolo Bot deleted the docs/claude-code-v2.1.318-20261106-0731 branch November 6, 2026 07:33
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