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Centralized note store across AI clients: Claude, ChatGPT, Cursor, Codex, Windsurf. Save in one client, access in another instantly. Across devices — phone, desktop, everywhere. Cross-session context: 'catch me up' surfaces plans and findings from any prior session. AES-256-GCM encryption at rest, per-user key isolation. Soft delete with 30-day recovery window. Pin notes to exempt from cleanup and prioritize. Tag notes for categorization and filtering ('tag: auth'). Your mctx account is your identity — instant access from any AI tool.

Personal todo list that persists across sessions. Create, update, complete, reorder, and delete todos. Todos are private to your mctx account. Call status first in every new session to see what's pending.

Play a legendary text adventure by talking to your AI — no commands to memorize. The Hidden Empire puts a full underground world of puzzles, treasures, and trolls inside your conversation. Speak naturally: say 'head north,' 'grab the lantern,' or 'what am I carrying?' and your AI handles the rest. Execute multi-move plans in one shot, undo mistakes instantly, and save up to 20 named playthroughs you can resume from any session. Based on the MIT-licensed Zork I source, rebuilt from the ground up for AI-native play.

Study the Bible in its original languages, trace themes across both testaments, and compare five translations — all in one conversation. Ask any question about what Scripture says and get grounded, cited answers: What does the Bible say about suffering? Topical search surfaces Job as the Bible's principal witness on suffering (with explanations of why it matters and suggested starting passages), Psalms on lament, Romans on justification — whole books and narratives alongside individual verses. What is the Hebrew word behind lovingkindness in Psalm 23? Compare how KJV and WEB translate John 3:16. Trace the word grace through Paul's letters. Covers 155,510 verses across KJV, WEB, ASV, YLT, and Darby with 606,140 cross-references, 17,543 Strong's entries, BDB and Thayer lexicon definitions, and Nave's 5,319 topical categories.

Build complete Apps with our framework — study or fork this reference implementation. Covers all @mctx-ai/app patterns: tool types (sync string, object return, generators, LLM sampling), resource URIs (static, dynamic templates), prompt formats (single-message, multi-message), tool annotations (readOnly, destructive, openWorld, idempotent), structured logging, environment variables, and test coverage. The whoami tool demonstrates user identity via ctx.userId. Includes setup.sh for quick template generation.