Design workflows with an LLM

LLM graph engineering assistant

Turn LangGraph, Markdown, skills, rules, code, or plain prose into a reviewable workflow graph. Inspect every node and edge, revise it by conversation, and hand off canonical WorkflowSpec JSON to any coding agent so the flow can be converted to LangGraph or used as a skill.

Example request: “SceneBoard, draw this as a workflow graph.”

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Canonical WorkflowSpec JSON

Select the complete JSON and attach it with the source to your coding request.

{"edges":[{"condition":null,"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"fromNodeId":"node_review","id":"edge_review_end","kind":"normal","label":null,"priority":null,"stateKeys":[],"toNodeId":"node_end"},{"condition":null,"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"fromNodeId":"node_start","id":"edge_start_review","kind":"normal","label":null,"priority":null,"stateKeys":[],"toNodeId":"node_review"}],"entryNodeIds":["node_start"],"exitNodeIds":["node_end"],"nodes":[{"control":null,"errorPolicy":null,"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"id":"node_end","instructions":[],"kind":"end","label":"Complete","purpose":null,"retryPolicy":null,"skills":[],"stateInputs":[],"stateOutputs":[],"subflowId":null,"tools":[]},{"control":null,"errorPolicy":null,"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"id":"node_review","instructions":["Review the draft against the acceptance criteria."],"kind":"action","label":"Review draft","purpose":"Check the draft against acceptance criteria.","retryPolicy":null,"skills":[],"stateInputs":[],"stateOutputs":[],"subflowId":null,"tools":[]},{"control":null,"errorPolicy":null,"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"id":"node_start","instructions":[],"kind":"start","label":"Start","purpose":null,"retryPolicy":null,"skills":[],"stateInputs":[],"stateOutputs":[],"subflowId":null,"tools":[]}],"schemaVersion":"1.0","sources":[{"digest":null,"id":"source_conversation","kind":"prose","label":"Design conversation"}],"subflows":[],"unresolvedQuestions":[],"warnings":[],"workflow":{"evidence":{"basis":"explicit","confidence":1,"sourceRefs":[{"endLine":null,"locator":null,"sourceId":"source_conversation","startLine":null}]},"id":"workflow_graph_review","summary":"A framework-neutral workflow designed through conversation.","title":"Conversational graph review"}}

WorkflowSpec v13 nodes · 2 edges

node_startStart

node_reviewReview draft

node_endComplete

Start → Review draft

Review draft → Complete

From LLM output to a presentation

Share an LLM-generated deck
with one link—and present it instantly.

Public URL sharing · Browser presentation · PDF/PPTX download

View presentation sample ↗Create an account

Open source · Apache-2.0 · Created by LeeCat

SceneBoard1 / 6

LLM deck · ready to share

From generated result to a shareable presentation

Join a live presentation from the same URLPresent in the browserDownload PDF or PPTX

Join a live presentation from the same URL

Everyone in the same live session sees page changes and pen drawings in real time.

Present in the browser

Move through pages, go full screen, and annotate with the presentation pen.

Download PDF or PPTX

Keep a portable copy for meetings, review, and handoff.

Visual Human-in-the-Loop

Consent needs context, not a tiny approval prompt.

Long requests expand into a focused workspace. The explanation can grow and scroll while the decision title and response action stay accessible.

Why the decision is needed now
What changes—and what cannot change
Evidence, uncertainty, limits, and safeguards
The consequence of every available option

Decision workspaceReversible planning choice

Choose the first checkout risk to verify

This choice changes the order of verification. It cannot deploy code, modify customer data, or authorize a payment.

Inventory reservation before paymentVerify that an unavailable item can never be charged.

Duplicate order preventionVerify that retries cannot create a second order.

A visual communication surface for Codex

The whiteboard Codex can operate freely.

Codex builds the work. SceneBoard turns it into a presentation-ready explanation, gives people a deliberate place to decide, and preserves every visual revision.

Live sceneRevision 6

What Codex receivedImplement retries per D1, D2, ADR-014.Compressed working language

What the reviewer seesCheckout reliability—explained for a human

Reserve inventory before payment. A retry returns the original result and can never create a second order.

Rule · reason · consequence

Three-minute product story

Codex builds. SceneBoard explains. Humans decide.

See compressed project context become a visual briefing, a human decision, and a response-driven plan.

The film demonstrates context expansion, an informed Human-in-the-Loop choice, response-driven planning, revision history, 2D Canvas, interactive UI, data visualization, and Three.js/WebGL.

Why SceneBoard

A second surface for AI work

Terminal output is excellent for execution. SceneBoard is built for understanding, review, and human direction.

Context becomes understandable

Codex expands internal shorthand, contracts, architecture decisions, and implementation details into one self-contained briefing.

Human decisions get enough room

Human-in-the-Loop requests become decision workspaces with evidence, limits, risks, reversibility, and meaningful consequences.

The reasoning stays reviewable

Every visual state is preserved as a revision, so people can inspect how the explanation and the decision evolved.

One workspace, many visual languages

Codex chooses the medium that explains the work best.

Document

Clear briefings and implementation reports

Diagram

Architecture, dependencies, and recovery paths

Canvas

2D drawing and animated visual explanation

Prototype

Interactive application concepts and flows

WebGL

Three-dimensional, spatial experiences

Built in the open

A whiteboard developers can extend with Codex.

SceneBoard is an Apache-2.0 open-source project created by LeeCat. Extend its skills, renderers, integrations, and visual vocabulary for your own workflows.

View on GitHub

Give Codex a surface made for human understanding.

Build the work, explain the reasoning, and keep people in control.

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