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Claude Code — LLM Tracker
CLAUDE · LLM TRACKER ·
How to use Claude Code in 2026, Claude Code, MCP, and the Anthropic API — version-pinned and re-verified as releases ship. Every guide is version-pinned and re-verified as new releases ship — so stale advice flags itself instead of quietly misleading you.
NEW TO CLAUDE CODE The best setup for 2026 Skip the feature tour. Shortest path from empty directory to a Claude Code setup that behaves well for real work — native installer, settings.json, skills, and the two MCP servers worth the context tax.
ALREADY A POWER USER Tips worth 10 minutes Ultrareview, forked subagents, skills vs. commands — the things that changed in the last quarter.
BUILDING WITH THE API Claude Code releases & SDKs Version ladder from npm, CHANGELOG, and the GitHub releases of every language SDK — deduped into one timeline.
CONTEXT ENGINEERING Long sessions, sharper Layered CLAUDE.md, auto-memory, compaction. The discipline that makes 1M tokens feel like 100K.
TOP MCP SERVERS
The short list worth your context budget auto-refreshed every 2h
Secure file operations with configurable access controls — lets Claude read, write, and list files on the local machine.
npx -y @modelcontextprotocol/server-filesystemreference
Tools to read, search, and manipulate Git repositories without shelling out.
uvx mcp-server-gitreference
ESSENTIAL COMMANDS & FLAGS
Claude Code reference Slash commands · 25 /dataviz — Skill. Design guidance for charts, graphs, and dashboards. Claude picks the chart form for the data, assigns color by role, validates the palette for colorblind safety and contrast with a bundled script, and applies mark, interaction, and accessibility rules. Uses a brand-neutral placeholder palette that you replace with your own. Requires Claude Code v2.1.198 or later /design-sync — Skill. Convert your repo’s React design system and upload it to Claude Design, so designs it produces use your real components. Optionally name the design system, for example /design-sync Acme DS. A first-time sync verifies every component and can take a few hours on a large repo. Available on the Anthropic API; on Amazon Bedrock, Google Cloud’s Agent Platform, and Microsoft Foundry the underlying tool can’t reach claude.ai, so the command is unavailable /design-login — Authorize design-system access for /design-sync with your claude.ai account /advisor — Enable or disable the advisor tool, which consults a second model for guidance at key moments during a task. Accepts opus, sonnet, fable (v2.1.170+), or a full model ID. Without an argument, opens a picker. Requires Claude Code v2.1.98 or later /cd — Move this session to a new working directory. The conversation’s prompt cache is preserved: the new directory’s CLAUDE.md is appended as a message instead of rebuilding the system prompt. The session is relocated to the new directory’s project storage, so --resume and --continue find it from there. Prompts you to trust the directory if you haven’t worked in it before. To grant access to an extra directory without moving the session, use /add-dir. Restrict or disable /cd targets with Cd permission rules. Requires Claude Code v2.1.169 or later; earlier versions report Unknown command: /cd
LATEST GUIDES
Version-pinned, staleness-aware TRACKER FRESHNESS PROOF
The pollers behind this page Web content fetching and conversion for efficient LLM usage.
Knowledge-graph-based persistent memory across sessions.
npx -y @modelcontextprotocol/server-memoryreference
Structured step-by-step reasoning scratch-pad with revision and branching.
npx -y @modelcontextprotocol/server-sequentialthinkingreference
Reference / test server exercising every MCP feature (prompts, resources, tools) — the canonical learning-by-example server.
npx -y @modelcontextprotocol/server-everythingreference
Time and timezone conversion utilities.
uvx mcp-server-timereference
/fork — Spawn a forked subagent: a background subagent that inherits the full conversation and works on the directive while you keep going. Its result returns to your conversation when it finishes. To switch into a copy of the conversation yourself, use /branch. Before v2.1.161, /fork is an alias for /branch
/deep-research — Workflow. Fan out web searches on a question, fetch and cross-check sources, and synthesize a cited report
/workflows — Open the workflow progress view to watch, pause, resume, or save running and completed workflows
/reload-skills — Re-scan skill and command directories so skills added or changed on disk during the session become available without restarting. Reports how many skills are available and how many were added or removed. Added in v2.1.152
/code-review — Skill. Review the current diff for correctness bugs and for reuse, simplification, and efficiency cleanups. Pass --fix to apply findings to your working tree, --comment to post them as inline GitHub PR comments, or ultra to run a deep cloud review. From v2.1.154, /simplify runs a separate cleanup-only review that applies fixes without hunting for bugs. See Review a diff locally for effort levels and targeting
/run-skill-generator — Skill. Teach /run and /verify how to build, launch, and drive your project’s app from a clean environment by writing a per-project skill. Requires Claude Code v2.1.145 or later
/run — Skill. Launch and drive your project’s app to see a change working, not only passing tests. See Run and verify your app. Requires Claude Code v2.1.145 or later
/verify — Skill. Confirm a code change does what it should by building your project’s app, running it, and observing the result, rather than relying on tests or type checks. See Run and verify your app. Requires Claude Code v2.1.145 or later
/usage-credits — Configure usage credits to keep working when you hit a limit. Opens the usage-credits billing page in your browser. When no browser can open, for example over SSH, the command prints the URL to visit instead; this requires Claude Code v2.1.205 or later, and earlier versions showed nothing in that case. Previously /extra-usage
/scroll-speed — Adjust mouse wheel scroll speed interactively, with a ruler you can scroll while the dialog is open to preview the change. Available in fullscreen rendering only and not in the JetBrains IDE terminal
/goal — Set a goal: Claude keeps working across turns until the condition is met. With no argument, shows the current or most recently achieved goal. clear, stop, off, reset, none, or cancel removes an active goal early
/background — Detach the current session to run as a background agent and free this terminal. Pass a prompt to send one more instruction before detaching. Monitor the session with claude agents. Alias: /bg
/stop — Stop the current background session. Only available while attached to a background session; the transcript and any worktree are kept. To detach without stopping, use /exit or press ←
/radio — Open Claude FM lo-fi radio in your browser. Prints the stream URL when no browser is available. Not available on Amazon Bedrock, Google Cloud’s Agent Platform, or Microsoft Foundry
/chrome — Configure Claude in Chrome settings
/mobile — Show QR code to download the Claude mobile app. Aliases: /ios, /android
/cost — Alias for /usage
/privacy-settings — View and update your privacy settings. Only available for Pro and Max plan subscribers
/focus — Toggle the focus view, which shows only your last prompt, a one-line tool-call summary with edit diffstats, and the final response. As of v2.1.198, the tool-call summary also counts the subagents launched in the turn and collapses completed background-task notifications into a single count. The selection persists across sessions; set viewMode in settings to override it. Only available in fullscreen rendering
/agents — As of v2.1.198, running /agents prints a reminder to ask Claude to create or manage subagents, or to edit .claude/agents/ or ~/.claude/agents/ directly. On v2.1.197 and earlier, opens an interactive interface for creating and managing subagent configurations
Flags · 9 --append-subagent-system-prompt — Append custom text to the end of every subagent’s system prompt, including nested subagents. Only applies in non-interactive mode with -p. Requires Claude Code v2.1.205 or later --cloud — Create a new web session on claude.ai with the provided task description --ax-screen-reader — Render screen-reader friendly output: flat text without decorative borders or animations. Forces the classic renderer, so the tui setting has no effect for the session. Takes precedence over CLAUDE_AX_SCREEN_READER and the axScreenReader setting. Requires Claude Code v2.1.181 or later --advisor — Enable the server-side advisor tool for this session with a model alias: opus, sonnet, or fable (v2.1.170+), or a full model ID. Takes precedence over the advisorModel setting for the session. Requires Claude Code v2.1.98 or later --safe-mode — Start with all customizations disabled to troubleshoot a broken configuration: CLAUDE.md, skills, plugins, hooks, MCP servers, custom commands and agents, output styles, workflows, custom themes, custom keybindings, status line and file-suggestion commands, LSP servers, and auto-memory do not load. Authentication, model selection, built-in tools, and permissions work normally, which differs from --bare. Managed settings policy still applies, including policy-configured hooks, status line, and file-suggestion commands; managed plugins, managed skills, managed CLAUDE.md, and policy-configured MCP servers do not. Useful for checking whether a customization is what triggers automatic fallback from Fable 5. Sets CLAUDE_CODE_SAFE_MODE --prompt-suggestions — Emit a prompt_suggestion message after each turn with a predicted next user prompt. Requires --print, --output-format stream-json, and --verbose. See Prompt suggestions --exec — Run a shell command as a PTY-backed background job instead of starting a Claude session. Use with --bg to launch from the shell --bg — Start the session as a background agent and return immediately. Prints the session ID and management commands. Combine with --exec to run a shell command as a background job instead of a Claude session, or with --agent to run a specific subagent. Cannot be combined with -p/--print; see the error reference --plugin-url — Fetch a plugin .zip archive from a URL for this session only. Repeat the flag for multiple plugins, or pass space-separated URLs in a single quoted value
CLI subcommands · 12 claude gateway — Start the self-hosted Claude apps gateway server, for administrators deploying SSO and policy in front of Claude Code on Amazon Bedrock, Google Cloud’s Agent Platform, or Microsoft Foundry. Requires --config pointing at a gateway.yaml. Available in Claude Code v2.1.195 and later. claude mcp login <name> — Run a configured MCP server’s OAuth flow without opening the interactive /mcp panel. Works for HTTP, SSE, and claude.ai connector servers. Add --no-browser over SSH to print the authorization URL instead of opening a browser, then paste the redirect URL back at the prompt. Requires Claude Code v2.1.186 or later. See Authenticate from the command line claude mcp logout <name> — Clear stored OAuth credentials for an MCP server. Requires Claude Code v2.1.186 or later claude daemon stop --any — Stop the background-session supervisor and the sessions it hosts. Pass --keep-workers to leave background sessions running so the next supervisor reconnects to them. --any confirms stopping an on-demand supervisor, which is the default. Use this to recover from an unresponsive supervisor claude daemon status — Print the background-session supervisor’s state, version, socket directory, and worker count for diagnostics. Exits 1 if the supervisor isn’t running claude logs <id> — Print recent output from a background session claude stop <id> — Stop a background session. Also accepts claude kill claude rm <id> — Remove a background session from the list. The conversation transcript stays on your local machine, available through claude --resume claude respawn <id> — Restart a background session, running or stopped, with its conversation intact. Use --all to restart every running session, e.g. to pick up an updated Claude Code binary claude attach <id> — Attach to a background session in this terminal claude project purge [path] — Delete all local Claude Code state for a project: transcripts, task lists, debug logs, file-edit history, prompt history lines, and the project’s entry in ~/.claude.json. Omit [path] to pick from an interactive list. Flags: --dry-run to preview, -y/--yes to skip confirmation, -i/--interactive to confirm each item, --all for every project. See Clear local data claude ultrareview [target] — Run ultrareview non-interactively. Prints findings to stdout and exits 0 on success or 1 on failure. Use --json for the raw payload and --timeout <minutes> to override the 30-minute default
Hook events · 2 MessageDisplay Setup