explainx / blog
Claude Code CLI 2.1.191 adds /rewind to resume before /clear, permanent background agent stops, 37% lower streaming CPU, MCP OAuth retries, hook matcher fixes, and 20 CLI changes — full changelog.
Jul 13, 2026
@Saboo_Shubham_ reposted OpenAI's official Codex plugin for Claude Code — 28k+ GitHub stars, months old, not a surprise drop. explainx.ai maps /codex:review, /codex:rescue, transfer flows, and why Claude→Codex works but not the reverse.
Jul 12, 2026
@ClaudeDevs ships Claude Code desktop browser — read, click, debug URLs sandboxed. Version 1.2581.0 July 10. explainx.ai setup, shortcuts, and developer reactions.
Jul 7, 2026
On July 7, 2026, @ClaudeDevs published the definitive Claude Code loops guide by @delba_oliveira — how the team categorizes loops by trigger, stop criteria, and primitive. explainx.ai maps each type to real commands, skills, and the loop-engineering corpus you already have on-site.
TL;DR: Claude Code 2.1.191 dropped June 25, 2026 (@ClaudeCodeLog / @marc_krenn). Headline features: /rewind resumes context from before /clear, background agent stops are permanent, ~37% lower CPU during streaming (100ms coalescing), comma-separated hook matchers fixed, and a pile of MCP reliability improvements. Twenty CLI changes total.
| Change | Why it matters |
|---|---|
/rewind after /clear | Undo an accidental clear without losing the thread |
| Background agents stay stopped | Kills from tasks panel no longer resurrect |
| Streaming coalescing (100ms) | ~37% CPU reduction; smoother long sessions |
| Hook matcher fix | "Bash,PowerShell" matchers actually fire now |
| MCP retries + OAuth | Transient network errors backoff; headless OAuth skips browser popup |
| Sandbox network memory | "Yes" on host allow persists for the session |
| Permissions UI fix | Recently-denied approvals persist on close |
/rewind: recover from /clearThe biggest workflow fix in 2.1.191:
Added
/rewindsupport for resuming a conversation from before/clearwas run.
Before: /clear (aliases /reset, /new) wiped context. If you cleared too aggressively, you relied on /resume for a saved session — not the in-flight thread.
After: /rewind rolls back to a checkpoint before the clear, restoring prior context so the session continues.
This sits alongside existing rollback tools:
| Mechanism | Trigger | Scope |
|---|---|---|
| ESC × 2 | Keyboard | Code and/or conversation checkpoints |
/rewind | Slash command | Checkpoints + pre-/clear restore (2.1.191+) |
/resume | Slash command | Saved named sessions |
/branch | Slash command | Fork conversation at a point |
Deep dive: Claude Code commands reference · Checkpoint restore guide.
Fix: Background agents stopped from the tasks panel no longer restart — stopping is permanent.
If you run parallel work via /fork, /agents, or /tasks, a stop that silently undid itself was dangerous (duplicate edits, double bash). 2.1.191 closes that hole.
Related: claude agents no longer sends builtin slash commands like /usage to background sessions as raw prompt text — you get a hint instead.
Two related improvements:
For developers running sound and traffic-light hooks on long agent sessions, lower CPU and stable scroll make unattended monitoring less painful.
Bug: Hooks with matchers like "Bash,PowerShell" silently never fired.
Fix in 2.1.191: Multi-tool matchers parse correctly.
If you copied hook recipes from forums and wondered why nothing ran, update first, then audit ~/.claude/settings.json:
{
"hooks": {
"PreToolUse": [
{
"matcher": "Bash,PowerShell",
"hooks": [{ "type": "command", "command": "echo triggered" }]
}
]
}
}
| Area | Change |
|---|---|
| Capability discovery | tools/list, prompts/list, resources/list retry transient errors with backoff |
| OAuth | Discovery/token requests retry once; headless skips browser popup → paste URL prompt |
| Errors | HTTP 404 shows URL + pointer to MCP config |
| Reliability | Fewer flaky server dropouts on slow networks |
Connect tools: Claude Code MCP guide.
/permissions Recently-denied tab — approving a denial now persists on close (was silently discarded)/voice — when disabled by org policy, message explains the restriction (not generic "not available")forceRemoteSettingsRefresh works via MDM/file policy; fetch sends Cache-Control: no-cache/login URL — no longer truncated when wrapped in Windows Terminal[Image #N] not full filesystem paths/ search — hints how to reach slash commands from NORMAL modePer @ClaudeCodeLog extended thread, 2.1.191 also adds:
Environment variables: BUF_BIGINT_DISABLE, CLAUDE_CODE_DD_ERROR_TRACKING_FLUSH_INTERVAL_MS, NODE_USE_ENV_PROXY, MINIMATCH_TESTING_PLATFORM
Model aliases (internal/flags): claude-bg-, claude-code-error-tracking, o5-qn, o5-u:, opus-on-pro-near-limit
Treat model slug additions as feature-flag plumbing unless documented on code.claude.com.
# If installed via npm/homebrew — follow your usual upgrade path
claude --version # confirm 2.1.191+
# Or use Claude Code's built-in update mechanism per official docs
Changelog source: @ClaudeCodeLog (unofficial, tolerated bot) · full history in linked GitHub repo.
Changelog items sourced from @ClaudeCodeLog posts on June 25, 2026. Verify behavior on your installed version — patch details may vary by platform.