2.1.117

Forked subagents can now be enabled on external builds by setting CLAUDE_CODE_FORK_SUBAGENT=1

Agent frontmatter mcpServers are now loaded for main-thread agent sessions via --agent

Improved /model: selections now persist across restarts even when the project pins a different model, and the startup header shows when the active model comes from a project or managed-settings pin

The /resume command now offers to summarize stale, large sessions before re-reading them, matching the existing --resume behavior

Faster startup when both local and claude.ai MCP servers are configured (concurrent connect now default)

plugin install on an already-installed plugin now installs any missing dependencies instead of stopping at "already installed"

Plugin dependency errors now say "not installed" with an install hint, and claude plugin marketplace add now auto-resolves missing dependencies from configured marketplaces

Managed-settings blockedMarketplaces and strictKnownMarketplaces are now enforced on plugin install, update, refresh, and autoupdate

Advisor Tool (experimental): dialog now carries an "experimental" label, learn-more link, and startup notification when enabled; sessions no longer get stuck with "Advisor tool result content could not be processed" errors on every prompt and /compact

The cleanupPeriodDays retention sweep now also covers ~/.claude/tasks/, ~/.claude/shell-snapshots/, and ~/.claude/backups/

OpenTelemetry: user_prompt events now include command_name and command_source for slash commands; cost.usage, token.usage, api_request, and api_error now include an effort attribute when the model supports effort levels. Custom/MCP command names are redacted unless OTEL_LOG_TOOL_DETAILS=1 is set

Native builds on macOS and Linux: the Glob and Grep tools are replaced by embedded bfs and ugrep available through the Bash tool — faster searches without a separate tool round-trip (Windows and npm-installed builds unchanged)

Windows: cached where.exe executable lookups per process for faster subprocess launches

Default effort for Pro/Max subscribers on Opus 4.6 and Sonnet 4.6 is now high (was medium)

Fixed Plain-CLI OAuth sessions dying with "Please run /login" when the access token expires mid-session — the token is now refreshed reactively on 401

Fixed WebFetch hanging on very large HTML pages by truncating input before HTML-to-markdown conversion

Fixed a crash when a proxy returns HTTP 204 No Content — now surfaces a clear error instead of a TypeError

Fixed /login having no effect when launched with CLAUDE_CODE_OAUTH_TOKEN env var and that token expires

Fixed prompt-input undo (Ctrl+_) doing nothing immediately after typing, and skipping a state on each undo step

Fixed NO_PROXY not being respected for remote API requests when running under Bun

Fixed rare spurious escape/return triggers when key names arrive as coalesced text over slow connections

Fixed SDK reload_plugins reconnecting all user MCP servers serially

Fixed Bedrock application-inference-profile requests failing with 400 when backed by Opus 4.7 with thinking disabled

Fixed MCP elicitation/create requests auto-cancelling in print/SDK mode when the server finishes connecting mid-turn

Fixed subagents running a different model than the main agent incorrectly flagging file reads with a malware warning

Fixed idle re-render loop when background tasks are present, reducing memory growth on Linux

[VSCode] Fixed "Manage Plugins" panel breaking when multiple large marketplaces are configured

Fixed Opus 4.7 sessions showing inflated /context percentages and autocompacting too early — Claude Code was computing against a 200K context window instead of Opus 4.7's native 1M