Workflow Atlas

Two tools for thinking and communicating about software, in one tiny app:

1. Workflows — hand-laid visual maps of a process, styled like technical drawings.
2. Algorithm storyboards — step-by-step animations of how an algorithm

behaves, with editable parameters and per-step comments, so an idea lands as a moving picture instead of a wall of prose.

https://github.com/user-attachments/assets/6e9e2f50-b197-46b7-b3cf-c809759a2912

A zero-dependency local server serves the app and gives any AI assistant — over MCP, so it's not tied to one provider — an authoring surface: it can create and edit the algorithm storyboards, the workflow maps, and even the CSS/HTML styling, so when the assistant proposes an algorithm it can show you a moving picture instead of a wall of prose. One install serves many projects and parallel sessions: each project's content lives in a home directory, and the server routes each session to its own project automatically (see Projects).

Open source under the MIT License (see LICENSE). No build step, no npm install, no framework — plain HTML/CSS/JS and Node built-ins.

A fully AI-driven project — by AI, for AI. Every line of code, every storyboard, and these docs were authored by AI assistants through the very MCP surface described below; humans only steer and review. The app exists to give an AI a place to show its thinking, not just describe it. Expect the quirks that come with that, and read the code before you trust it.

New projects start empty, so demos never mix with real work. To populate a fresh project with the bundled demo content (the authoring-loop and boot & serve maps, plus binary search / bubble sort / Euclid's GCD storyboards), run the server once with WORKFLOW_ATLAS_SEED=1.

Run

Zero install (Node ≥ 20). From this folder:

npm start                  # → http://localhost:5174/   (or: node server/server.mjs)

Works with any MCP client. With Claude Code you don't start it yourself — a project .mcp.json registers the server so the client spawns and manages it (one-time: approve it when prompted). Any other MCP client can launch node server/server.mjs over stdio just the same. The one process serves the app and exposes the MCP tools.

The open tab live-reloads when content changes — author a spec or workflow (this session or another) and the page refreshes itself (review autosaves are excluded, so typing a comment never reloads under you). A server is required: the app fetches project data from /api, and that data lives in your home dir, not in the served folder.

When the assistant authors a workflow or storyboard (save_workflows / save_algorithm) and no tab is open yet, the server opens the app in your default browser so the result is in front of you; if a tab is already open it just live-reloads instead. Disable the auto-open with ATLAS_NO_OPEN=1.

If the port (default 5174, override with PORT) is busy, the server adapts: if another workflow-atlas instance already holds it, this process reuses that UI and runs as an MCP/stdio worker (the shared file watcher still live-reloads your edits); if something unrelated holds it, the server steps to the next free port.

Local-only by design. The server binds to 127.0.0.1 and its write surface (the MCP tools and review autosave) rejects any request that isn't same-machine, same-origin — so a website you visit or another host on your network can't drive it. It is unauthenticated tooling meant for your own machine; only set ATLAS_HOST to expose it on another interface if you understand the risk.

Projects

Every project's content (algorithms, workflow maps, review overlays) is stored under a home directory — ~/.workflow-atlas/projects/<project>/ by default, override the base with $WORKFLOW_ATLAS_HOME. So one install serves many projects, and parallel sessions stay isolated.

• Routing. Each server process is bound to one project: by default the

directory it was launched in (so an MCP client opened in repo acme authors the acme project automatically). Set $WORKFLOW_ATLAS_PROJECT to pick one explicitly. The UI has a project switcher (top-left) to view any project, and the active project shows in the browser tab title.

• Isolation & concurrency. Different-project sessions never contend; writes are

atomic (temp-file + rename) so a torn write or two same-project sessions can't corrupt a file. The destructive save_workflows (replace-all) snapshots the prior file to workflows.json.bak first.

• Seeding. New projects start empty; WORKFLOW_ATLAS_SEED=1 copies the bundled

demos into a fresh project.

The infinite-nested canvas

A workflow map is a list of sheets; each sheet is an infinite-zoom board — a free-laid set of nodes connected by edges. The defining idea: any node can itself contain a board (node.board), so a chart can hold a chart can hold a chart, to unbounded depth.

• Semantic zoom (level-of-detail). A node renders at the detail its on-screen

size warrants: a status dot when tiny → a card (title · status · markers) → a frame that mounts its child board in place once it's large enough. Only what is both visible and big enough is in the DOM, so a deep tree stays cheap.

• Seamless re-rooting — why it's truly infinite. Zoom into a node until it fills

the viewport and the renderer re-roots onto that node's child board, rebasing the camera so cam.zoom returns to ~1. Because the zoom resets at every level, the scale chain never underflows floating point — so nesting depth has no practical limit (the e2e test dives 25 levels with the camera scale staying O(1)). Zoom back out and it pops one level. A breadcrumb (top-left) shows the path, and the URL hash mirrors it (#<sheet>/<nodeId>/<nodeId>…) so a nested view is deep-linkable, survives reload, and Back/Forward walk the nesting.

• Edges live within one board. An edge connects two nodes in the same board;

a cross-level relationship is expressed by containment (nest the node inside the other's board), never by an edge — that keystone invariant is what lets a board be rendered, dived into, and validated at any depth. Drag a connection from any of a node's four sides and the edge leaves that side toward the target.

• Direct manipulation. Turn on Edit to drag nodes, double-click empty canvas

to drop one, double-click a node to dive in, inline-edit a title, and right-click for a context menu — all over the same plain JSON.

Data shapes

A sheet is { id, code, name, title, sub, schema: 2, board }:

• board — { nodes: [], edges: [], view: { x, y, zoom } }.
• node — { id, x, y, w, h, title, status, sub?, detail?, algorithm?, board? }.

status ∈ done · partial · todo; detail is { in[], out[], note, open[] } (shown in the inspector); algorithm: '<id>' links a storyboard; and `board` nests a child chart — the same { nodes, edges } shape, recursively.

• edge — { id, from, to, kind, label?, fromSide? }. from/to are **node ids

in this same board**; kind ∈ flow · loop · dep; fromSide ∈ top · right · bottom · left is the side it leaves.

The validator rejects an edge whose endpoints aren't both in its board, a self-edge, and a board that nests one of its own ancestors (an infinite-recursion cycle) — depth itself is unbounded.

Legacy shorthand. A sheet may instead carry a flat stations: [...] spine (each { title, sub, status, detail }, with loop: { to, label } for a feedback arc and fan: { tracks: [...] } for parallel branches). It's auto-migrated into the board model on load — fan → a nested child board, loop → a loop edge — and the server commits the v2 board on the first write. New work should author board directly; reach for stations only for a quick linear spine.

Edit

All content is JSON — no diagram syntax, no code — stored per project under $WORKFLOW_ATLAS_HOME (see Projects) and edited through the MCP tools (the assistant authors it; changes show on reload). For workflows, prefer the per-sheet tools (save_sheet, delete_sheet, reorder_sheets) over the replace-all save_workflows — they edit one piece without resending the rest. save_sheet takes a whole sheet including its nested board (see the data shapes above); set_station / delete_station upsert one station in the legacy spine shorthand.

save_sheet / save_workflows reject a non-slug id, a code that isn't a short string, a bad status, and non-string detail.open/in/out (and save_workflows also rejects duplicate sheet ids); the response echoes non-fatal lint warnings (overlong badge, a sheet with no stations, a loop.to title with no matching station, an open question whose exact text repeats within a sheet). Deleting a sheet keeps its recorded decisions, so re-creating the same id later recovers them. The destructive save_workflows (replace-all) snapshots the prior file to the project's workflows.json.bak first, so an accidental reset is recoverable until the next replace-all.

Algorithm storyboards

A second view (top-left Workflows / Algorithms switch, or open algorithms.html) animates an algorithm step by step instead of describing it in prose. The stage shows the data (an array of value cells, or a worksheet), the pseudocode highlights the active line, and the narration explains each step — synced to a play / step / scrub transport (← → to step, space to play).

Each storyboard is a JSON spec (authored with save_algorithm, auto-discovered — no registration step). A spec is:

{
  "id": "binary-search", "tag": "ALG-01", "name": "Binary search",
  "sub": "…", "kind": "array",            // "array" (value cells) or "calc" (worksheet)
  "code": ["pseudocode", "lines"],         // highlighted as it runs
  "params": [ { "key": "target", "value": 33, "min": 1, "max": 99, "step": 1 } ],
  "steps": [ /* explicit frames — the simple, fully-authorable path */ ]
}

A frame (kind: "array") is { array[], cls{index:state}, ptr{label:index}, note, line, verdict{ok?,text}, question? }, where state is one of idle·active·compare·lo·hi·mid·eliminated·found·sorted. A row (kind: "calc") is { label, result?, unit?, expr?, sub?, kind?(input|result), bad?, line, note, question? }.

Instead of steps, a spec may set "builtin": "<name>" + "data" to be driven live by a built-in generator in shared/generators.js (the bundled binary search, bubble sort, and Euclid demos use this — change a param and the whole walk re-runs). Authored storyboards just use steps. Add one with the save_algorithm MCP tool.

Tuned params, comments & decisions — the review overlay

Your layer over a storyboard — tuned params, per-step comments, and recorded decisions — lives beside the spec in the project's reviews/<id>.json. With the server running the app autosaves to it as you edit and reloads it as the baseline next time. (Offline, edits stay in the browser only.)

Open questions → decisions

A trace step can pose an open design question (question: '…'). The storyboard shows it on that step with a box to record the decision (answer + who + when); resolved questions show settled, and the timeline marks open (hollow) vs decided (green). The decision is stored alongside the rest in the review file (decisions[step]). The point: addressing a question is one durable action, and the assistant can read/resolve it too. Best practice — when you decide, also let it drive a real change (a param default, the logic, a step's status) so the artifact and the decision can't drift apart.

Server + MCP — so the assistant shares the same data

server/server.mjs is one zero-dependency process that serves the app, persists reviews over REST, and speaks MCP — over stdio (how an MCP client like Claude Code launches it) and at /mcp over HTTP (for manual testing). Every tool acts on the session's project. Tools:

• Read — list_algorithms, get_algorithm, get_workflows, get_sheet,

get_review, get_workflow_review, list_open_questions

• Author algorithms — save_algorithm, delete_algorithm
• Author workflows — save_sheet / delete_sheet / reorder_sheets and

set_station / delete_station (per-piece upserts; preferred), or save_workflows (replace-all)

• Review / decisions — set_param, set_comment, set_decision,

reopen_question (algorithms); set_workflow_decision, reopen_workflow_question (workflow open questions)

• The look — list_files, get_file, set_file → read/overwrite raw app

files (CSS / HTML / JS / JSON / SVG / MD / TXT) to style the app (project data is edited with the content tools)

So the loop is: the assistant proposes an algorithm → it builds the storyboard with save_algorithm → you watch it run and leave a comment or decision → the assistant reads that over MCP and revises. Showing, not just telling. (The server also advertises this in its MCP instructions, so when you say you've answered, the assistant knows to call list_open_questions and read your decisions back.)

Optional: auto-pickup hook

scripts/atlas-review-hook.mjs is a Claude Code UserPromptSubmit hook: once you've answered every open question on a sheet/storyboard, your next message carries those decisions automatically (so the assistant revises without being told to re-read). It fires per unit — answering one sheet doesn't wait on the others, and the bundled demo questions never block it — and only once per answered state.

Wire it in your user settings with the absolute path to the script. It reads the same project the server bound to — derived from the directory Claude Code is open in, under $WORKFLOW_ATLAS_HOME — so it works from any repo:

{ "hooks": { "UserPromptSubmit": [ { "hooks": [
  { "type": "command", "command": "node \"/abs/path/to/workflow-atlas/scripts/atlas-review-hook.mjs\"" }
] } ] } }

ATLAS_HOOK_DEBUG=1 prints why it did/didn't fire (and which project) to stderr; ATLAS_CONTENT_DIR overrides the project path. It never blocks your prompt.

If your client is Claude Code, a project .mcp.json runs the server as a stdio MCP server, so it's spawned every session — you never start it by hand. One-time: reload the session (so .mcp.json is read) and approve the server when prompted. Other MCP clients register node server/server.mjs however they spawn stdio servers.

Files

workflow-atlas/
  index.html             workflows shell (title block · sheet · callout)
  algorithms.html        storyboard shell (stage · pseudocode · narration)
  styles.css             design system — palette, type, nodes/edges, stage
  app.js                 workflow app shell — sheet index, inspector, autosave, URL↔focus sync
  canvas.js              the infinite-nested canvas engine: semantic zoom (dot/card/frame),
                         focus-stack re-rooting, in-browser editing, four-side connections
  storyboard.js          algorithm player (loads specs, replay, transport)
  shared/board.js        the node/edge/board MODEL — geometry, ids, recursive (cycle-guarded) validation
  shared/migrate.js      legacy stations-spine → v2 board (nodes/edges); runs in browser AND server
  shared/generators.js   built-in algorithm generators (browser + server)
  shared/project.js      active-project resolution + switcher (browser)
  scripts/
    atlas-review-hook.mjs  optional Claude Code UserPromptSubmit hook
  content/               bundled demo seed (copied into a project on WORKFLOW_ATLAS_SEED=1)
  server/server.mjs      zero-dep Node server: static + REST + MCP (stdio + /mcp)
  package.json           npm start, metadata (zero dependencies)
  .mcp.json              registers the server for Claude Code
  LICENSE                MIT

~/.workflow-atlas/       project DATA (override with $WORKFLOW_ATLAS_HOME)
  projects/<project>/
    workflows.json       workflow maps
    algorithms/*.json    algorithm storyboards
    index.json           discovery manifest (server rewrites on save/delete)
    reviews/*.json       tuned params + comments + decisions (server writes)

.mcp.json registers the server (Claude Code's format; any MCP client can spawn node server/server.mjs over stdio):

{ "mcpServers": { "workflow-atlas": { "command": "node", "args": ["server/server.mjs"] } } }

(Another project can point its own .mcp.json here via a relative path such as ../workflow-atlas/server/server.mjs, so the tool stays usable from that session too.)