MeOS — Membrane OS

Markdown⊕ — Markdown, plus.

MeOS speaks Markdown⊕: plain Markdown, extended with membranes (the ⊕). A membrane is just a comment — so a Markdown⊕ document stays 100% valid Markdown, and the very same notation works in code. Markdown gave you formatting; Markdown⊕ adds structure, navigation, and bookmarks that bring you back — without touching your data.

A new world — where comments become commands.

It never stains your code or your manuscript — not by a millimeter.

The lightest OS. Warp anywhere and jump both ways with the Hyper TOC.

Your code undergoes cleavage (卵割) and becomes a single living organism.

The ultimate environment for creation!!!

And the future is in view: every membrane on Earth, connected.

I, My, MeOS 🐣

Ai, Mai, MeOS 🐥

You(AI) & I(LAI) 🐔

_{The whole picture. Editor = strata of membranes · right = the Me Dock cockpit.}

_{Line 4 → 13,957. 13,956 lines inside a single membrane — generated by AI, in one file.}

_{The cockpit. Hyper TOC · Current Me · bookmarks · 📊 access counter.}

_{Soft delete. Struck-through text is excluded from the count — see what you cut before you cut it.}

_{One file, a whole life. From line 1 to line 46,997 — all inside one membrane.}

MeOS for VSCm — Fold Membrane, Warp Anywhere

Part of MeOS™ for anywhere — the universal membrane notation.
Abbreviated as μOS (read: mu-OS / mi-OS / me-OS).
"micro-OS" on the surface — membraneOS at the root.

VSCm = VSCodium folded. The middle odiu is collapsed (just as MeOS folds membrane content), leaving the final m — the same m that begins membrane. The host editor renamed by its own guest notation: self-referential, compact, and symbolic.

The VSCm implementation of MeOS. MeOS notation itself is editor-independent; future implementations may target Joplin, Cursor, Obsidian, or any editor that supports comments.

The Crux of Membrane Notation

A membrane is a comment — so it leaves your original data as it is.
That is the crux of Membrane notation.
More than a boundary, a membrane has its own functions — comments (semantic metadata) create structure, like a cell membrane.

VSCodium meets Me.

It becomes MeOS — the Brain Editor.

Beyond Hyperlink — Navigate by Name, Return by Bookmark

Membrane names are proper nouns. Type a name in a TOC or a checklist — or search your whole workspace for it — and jump straight to that membrane.

🔖 Bookmarks bring you home. Drop up to three "place" bookmarks; one click flies you to your Front Anchor — the very line you're writing now. With two bookmarks, it becomes a bidirectional jump: leap there, and back, again and again.

Me (Membrane) transforms VSCodium into a Brain Editor for writers, developers, researchers, and AI.

Membrane structure introduces named, foldable, navigable thought architecture into code and text:

• Fold beyond headings
• Jump instantly by membrane name — from TOCs, checklists, or workspace search
• Return anywhere with bookmarks — three place markers and a one-click Front Anchor
• Use membrane names as proper nouns for workspace-wide discovery
• Build AI-readable and human-readable structured memory
• Transform notes, code, and knowledge into MeOS

This extension itself was co-created with AI trained to use membrane notation.

Once experienced, VSCodium can evolve from a code editor into a note system, thought system, and Brain Editor.

MeOS imagines a future where editors, note apps, and even operating systems become membrane-native.

Core Formula

MeOS := VSCodiuM = VSCodium + Membrane

Hyperlink connected pages.
Membranes connect meaning — by name, from anywhere.

MeOS for anywhere  ← the universal notation (parent brand)
MeOS for VSCodium  := μVSCodium      (this implementation, folded form)
MeOS for Mac       := μMac           (future)
MeOS for Phone     := μPhone         (future)
MeOS for Pad       := μPad           (future)
MeOS for OS        := μOS            (the OS layer, where the abbreviation folds into itself)

MeOS is the legal/registered name. μOS is the abbreviation / stylized form, used for logos, titles, and folded forms (μVSCodium, μMac, μPhone). Both refer to the same notation; the choice is visual.

Read the prefix μ as "μ" (mu), "mi", or "me" — your call. The Greek letter is the folded form (written, compact). The spoken word is the unfolded form (mePhone, miPhone, μPhone). The meaning is 「私の」 — mine, one with me.

μ is simply the Greek letter that corresponds to English m. Both descend from Phoenician mem (𐤌, "water" — the sound of waves). The shift m → μ is not a substitution to a foreign symbol; it is the same letter, traced back to its foundational form. Latin m, Greek μ, Cyrillic м — all carry the same sound across scripts.

Apple's i prefix marked devices for the individual. The μ prefix marks devices structurally aligned with the self. Where i pointed outward at "the individual customer", μ points inward at "the self that has folded into the device".

μ is also the SI symbol for micro — the smallest meaningful unit, the most compact carrier of meaning. A perfect membrane.

And μ is the first letter of Greek μέμβρανα (membrana, "membrane") itself. The glyph structurally encodes its own meaning — μOS reads as "micro-OS" on the surface, but unfolds to membraneOS at its root.

License & Trademark

Notation — Public Domain

The MeOS notation specification (membrane syntax, cross-reference ⇄, Me notation ⇒, badge format, depth markers, etc.) is dedicated to the public domain. The notation is intended to become a universal technical convention, in the spirit of open scientific terms like iPS, DNA, JSON, and YAML.

Anyone may implement, document, teach, fork, or extend the MeOS notation in any editor, language, framework, or system without permission, attribution, or fee. Derivative notations are welcome.

Software — MIT License

This VSCodium extension's source code is released under the MIT License. See LICENSE in the repository root. The extension is freely available for use, study, modification, and redistribution.

Trademark — Common-Law ™ (Unregistered)

MeOS™ and μOS™ are unregistered common-law trademarks asserted by 川嶋俊克 (Toshikatsu Kawashima) as of 2026.05.16, with prior art established via this repository's GitHub commit history.

The following name variants are also asserted as part of the MeOS™ family, primarily as defensive prior-art declarations against squatting in first-to-file jurisdictions (notably China):

Implementation naming pattern: MeOS for [target] (e.g., MeOS for VSCodium, MeOS for Mac, MeOS for Phone).

No formal trademark registration is currently pursued. The intent mirrors the iPS / JSON / Markdown model: the term is open, the implementation is free, the brand is identifiable.

You are explicitly permitted to:

• Use the names MeOS and μOS to refer to the notation and its compatible implementations (e.g., "MeOS for Vim", "a μOS extension", "MeOS notation").
• Build, distribute, and sell compatible implementations under derived names such as "MeOS for [your target]".
• Teach, write about, demonstrate, and discuss the notation freely.

You are asked not to:

• Apply the name MeOS or μOS to products that are incompatible with the published notation specification — use a different name in that case.
• Imply official endorsement or affiliation when none exists.

Formal trademark registration may be pursued in the future only for defensive purposes (preventing third-party squatting, e.g., in first-to-file jurisdictions). Such registration, if it happens, will not restrict legitimate free use described above.

Acknowledgments — Conceptual Lineage

MeOS stands on the shoulders of:

• Gheorghe Păun (1998) — Membrane Computing / P systems. The first formal use of "membrane" as a computational primitive. MeOS approaches the same word from a different direction: not as a model of computation, but as a model of human and AI thought structure.
• Shinya Yamanaka (2006) — iPSC. The lowercase i, consciously inspired by Apple's naming, became a universal scientific term without trademark restriction. MeOS adopts the same open-term model.
• Steve Jobs / Apple (1998) — the i prefix. The precedent for a single-letter folded brand carrier that becomes its own era. MeOS's μ continues this lineage, traced back through Latin m to Phoenician mem (𐤌, "water").

Features

• Membranes — comment-based structure that leaves your source untouched (decoration-only). Fold a huge file into a clean skeleton in one keystroke.
• Hyper TOC (H-TOC) — jump anywhere from an outline panel. One structure: read by AI (in-source, grep-able) and navigated by you (the panel).
• Current Me — always know which membrane the cursor is in; 3-point jump (open ⇔ close ⇔ cursor).
• Zoom Me! — focus into a sub-region, then return.
• Writer formatting — highlight / strikethrough / headings with text & background colors and //comments (editor⇄author notes), via one-tap buttons.
• 🔖 Bookmarks — leap there, and back — up to 3 "place" bookmarks with a one-click Front Anchor (the line you're writing right now). Two bookmarks make a bidirectional jump: there, and back, again and again. A safety net so you never lose your home.
• Raw view (👁 button or type kakaka) — toggle all rendering off to read the plain markup, or for a distraction-free editor. Cast the spell again to restore MeOS. (CJK input is already smooth — decorations live in the gutter — so you rarely need this.)

⚙️ Recommended setting: "editor.wrappingIndent": "none" Keeps wrapped lines flush, so they sit cleanly next to the gutter membrane lanes.

📌 Membrane lanes & wrapped lines — a quirk with an upside. Membrane lanes are drawn in the gutter (glyph margin), which keeps the text area completely untouched — most importantly, CJK / IME input stays perfectly smooth (no caret wedging). One side effect: the current editor API renders a gutter decoration only on the first visual row of a wrapped line, so the lane shows a small break wherever a line wraps. Many find this useful rather than annoying: the break quietly marks two things at a glance — the start of each membrane, and any unusually long paragraph (the rare line that wraps). In prose, most lines fit on one row, so a break stands out exactly where the text is dense. Like the rest of MeOS, the shape stays constant; only the signal changes. Prefer a perfectly continuous lane? Set "laiMembrane.gutterLanes": false to draw it inside the text instead — at the cost of some IME friction (so the gutter is the default). A note for VSCodium / VS Code maintainers: an API to let glyph-margin / gutter decorations span all visual rows of a wrapped line (as breakpoints and folding controls already do internally) would let MeOS offer both a perfectly continuous lane and clean IME input. We'd love to see it. 🙏

Markdown⊕ — Welcome to the New World

Markdown⊕ — the lightness of Markdown, with usability that leaves WYSIWYG far behind.

Your notes stop scattering. One file: a one-month diary, or a ten-year one. Goodbye to the sea of endlessly fragmented files. At last, a file becomes truly your own.

Wherever your data lives, warp to it in an instant through one entrance — the Hyper TOC. With three "anywhere bookmarks," flip between three jobs at full speed. Stride through gigantic data, stress-free.

The tool that always seemed like it should exist — yet never did. Step in once, and no one goes back to the old world. The old friction vanishes as if it had never existed — a comfortable lifelog life awaits.

And this is a fact: one AI wrote this membrane-structured code, and another AI took over and carried on without ever getting lost.… Put that structure to work as AI training data, and it could raise AI performance dramatically — that possibility, too, is here.

— One last thing. This extension — a single file of over 10,000 lines — was generated almost entirely by AI.… With no spec and no design document, I produced it in just one month.

— A collaboration between You(AI) & I(LAI).

Markdown⊕ ― 新世界へようこそ（日本語）

Markdown⊕ ― Markdown の軽快さはそのままに、WYSIWYG をはるかに凌ぐ快適さを。

ノートは、もう散らばらない。1ファイルで、1ヶ月日記も、10年日記も。 無数に分割されたファイルの海に、グッバイ。やっと、ファイルが"自分の所有物"になる。

データがどこにあっても、Hyper TOC という入口から一瞬でワープ。**3つの「どこでも栞」**で、3つの作業を高速に行き来する。巨大なデータの中を、ノーストレスで闊歩する。

ありそうで、手に入らなかったツール。一度足を踏み入れたら、もう旧世界には戻れない。あの不自由が、まるで嘘のように――快適なライフログ生活を。

そして、1つのAIが膜構造で書いたコードを別のAIが迷うことなく引き継ぐことができた。これは事実です。…この構造を AI の学習データに活かせば、AIの性能を飛躍的に引き上げることができる――そんな可能性も秘めている。

― 最後にひとつ。1ファイル1万行を超えるこの拡張機能は、ほぼすべて AI が生成した。…私は仕様も設計書も書かずに、わずか1ヶ月でプロデュースした成果です。

― AIと私(LAI)の共作。

🥷 魔法の呪文『かかか』(kakaka)

かかか（kakaka でも可）と打つ。それだけで Raw モード ―― 素のエディタに切り替わる。打った文字は自ら消える。

生のマークアップを覗きたいとき、あるいは装飾を消して集中したいときに。呪文をもう一度唱えれば、MeOS の全機能が戻ってくる。

そして ―― かな漢字変換は、Raw モードにするまでもなく快適だ。 装飾はすべてガター（行番号の脇）に描かれ、本文に指一本触れない。東アジア圏（CJK）の積年の悩みは、もう終わっている。

ボタンも、メニューも、ショートカットもいらない。ストレスフリー！

Type kakaka for a plain editor — to read the raw markup, or to focus with all decorations off. Cast it again to bring MeOS back. (CJK input is already smooth without it: decorations live in the gutter, never touching your text.)

Changelog

Full version history: see CHANGELOG.md.