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What's changed
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)