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1Install this skill: https://github.com/caru-ini/stack-diagram/tree/HEAD/skills/stack-diagram
Create cloud-architecture-style diagrams of tech stacks, system architectures, infra layouts, and service topologies — with real brand logos, grouped containers, and clean orthogonal arrows — delivered as self-contained HTML, a PNG image, a React/TSX component, or a live artifact. Use this skill whenever the user asks for an architecture / system / stack / infra diagram, a tech-stack overview, a service topology, a cloud-vendor-style diagram, or wants tech logos arranged into a picture of how their services connect — in any language, even if they don't name an output format, and even if the tools involved aren't cloud services.
license
MIT (see LICENSE); bundled fonts are SIL OFL 1.1
compatibility
Python 3.9+ and network access to fetch logos; PNG output also needs Playwright with Chromium
stack-diagram
Produces engineering-drawing-style architecture diagrams: real logos on white tiles, labeled group boxes (like cloud-vendor VPC diagrams), orthogonal arrows with monospace labels, on a cool graph-paper background. One self-contained HTML file is the source of truth; PNG / TSX / artifact are derived from it.
Requirements
Python 3.9+ (standard library only for fetch_icons.py, build.py and share.py)
Network access to the icon sources (svgl.app, raw.githubusercontent.com, cdn.jsdelivr.net, aws.amazon.com and d1.awsstatic.com for AWS icons, services.google.com for Google Cloud icons, learn.microsoft.com and arch-center.azureedge.net for Azure icons, plus the brand's own site or repo for name=URL) when fetching icons
Build the HTML from assets/template.html — scripts/build.py
Render a PNG and look at it before delivering
Deliver in the requested format(s)
Optionally share it to the public gallery
Step 1 — Content
From the user's list of technologies/services, decide:
Nodes: each tech = one node (name + a short lowercase role like http server, sqlite db)
Groups: draw a box around things that share a runtime, vendor, or repo (e.g. a cloud provider box containing a runtime box; a monorepo box for tooling). Nesting one level deep is fine; deeper gets noisy. Write group labels in the brand's own casing (GitHub, npm); the template shows them as written.
If the user gave only a flat list of tools, infer sensible groups and flows from what the tools are — only ask when a tool is ambiguous enough that the diagram would be wrong either way.
Spec forms: name (name used as slug), name:slug (different slug), name=URL (explicit URL), name:aws/<Name> (official AWS icon), name:gcp/<Product> (official Google Cloud icon), name:azure/<Name> (official Azure icon). The script tries, in order: svgl → devicon → gilbarbara/logos, writes files plus manifest.json, and flags icons whose fill is white. svgl (svgl.app) is first because it carries current official marks for modern dev brands (TanStack, Better Auth, Hono...). When a logo has light/dark versions, the light one becomes <name> (tiles are white in both themes) and the dark one is saved as <name>_dark for group labels. svgl is matched by exact title only, so a miss just falls through. Its API also exposes wordmark variants — occasionally useful for a wide group-label, never for tiles.
Rules that matter more than the mechanics:
Never recolor a logo. Users notice. If a logo is white or too light for a white tile, put it on a dark tile (tile dark class) instead of touching its fill. The manifest's white_fill flag is a heuristic — a white fill can be an inner detail on a colored mark (tRPC, Ubuntu), so glance at the SVG before reaching for the dark tile.
Official marks only. simple-icons is deliberately not a source: its glyphs are monochrome redraws, and users call them wrong on sight. When every source misses (FAIL), find the official file and pass it as name=URL — look in the project's repo (root logo*.svg, docs/, assets/, public/) and on its site (/logo.svg, /favicon.svg, /images/logo.svg). Some marks live only in the repo (Lefthook's is logo_sign.svg at the root of evilmartians/lefthook).
Abstract concepts get pictograms, not text. A node like "dev environment", "cron", "queue", "cache", or "webhook receiver" has no brand — reach for a Lucide line icon via name:lucide/<icon> (e.g. devenv:lucide/terminal, cron:lucide/clock; browse lucide.dev/icons). No text-in-a-tile, no emoji.
Vendor sub-products (Cloudflare D1/R2/KV...) usually have no distinct logo: just reuse the vendor logo on the tile and let the node name carry the distinction ("Cloudflare D1" / "sqlite db").
AWS uses AWS's own icons. Each service has one: fetch it with name:aws/<Name>, read from AWS's official icon package at run time (e.g. lambda:aws/lambda, aws:aws/AWS-Cloud-logo, s3:aws/s3). The AWS- / Amazon- prefix is optional, common acronyms work (s3, sqs, sns, ses, ecs, eks, ecr, elb, alb, nlb, iam, kms, msk, vpc), and a miss prints every name. The slugs aws, amazonwebservices and aws-* go to the same package, and what it doesn't carry FAILs instead of falling back to a third-party copy. Always write the aws/ prefix for a service: a bare dynamodb still goes through the third-party chain. Keep the package and loose icon files out of repos: AWS allows the icons in diagrams, and redistribution is unconfirmed.
Step 3 — Layout
Read references/geometry.md for the coordinate system, spacing constants, and — most importantly — the edge anchoring rules that prevent arrows from running through label text. The one-line version: a node is its tile plus the text under it; vertical arrows connect node-box boundaries, never tile-to-tile through text.
Step 4 — Build
Copy assets/template.html, replace the sample GROUPS / EDGES / NODES / header sections with yours (the template's markup doubles as format documentation), then inline the assets. Set lang on <html> to the language of the diagram's labels (en by default; use ja for Japanese so browsers pick Japanese glyph variants). Two options the template already carries: a dark variant (set data-theme="dark" on <html>; tiles stay white so logos survive, group-label icons follow the Step 2 rule, and arrowheads and legend swatches follow the tokens automatically), and a "deploy to platform X" edge where X is a group, not a node — point the arrow at the most representative node inside the group and label the edge (deploy), which reads correctly.
Icons are referenced in markup as %%ICON_<name>%%; fonts as %%FONT_DISPLAY%% (Geist) / %%FONT_JBM%% (JetBrains Mono). The build fails loudly on unresolved tokens. Keep every color and font behind the CSS custom properties already in the template — tweak the tokens, not scattered values.
If the diagram contains Japanese text, the render host needs a Japanese font, or CJK characters silently come out in Chinese glyph variants (users notice immediately). The script warns and prints a fix; the template's font stack already names the Noto JP faces.
Checklist while looking at it:
No arrow crosses label text; no arrowhead lands inside text
Edge labels readable (they have a paper-colored halo — confirm it's working)
Every icon visible (white-on-white is the classic failure → dark tile), including group-label icons in the dark render
Group labels sit in their group's top-left corner, clear of nodes and edges; each group's left and right padding match
Nothing sticks out of its group box; nothing clipped at canvas edge
Fix and re-render until clean. This loop is cheap; shipping a diagram with overlapping text is not.
Step 6 — Deliver
HTML (default): the built file itself. Self-contained, works offline.
PNG: always produced by screenshotting the built HTML with headless Chromium (render_png.py, --scale 2 for crisp text) — never by drawing a separate image with matplotlib/PIL/standalone SVG rasterizers; the HTML is the single source of truth and the browser's text/SVG rendering is what makes it look right. By default the script emits BOTH themes (out.png light + out-dark.png) with square corners (radius is stripped for the screenshot only) — deliver both unless the user asked for one; --single captures the document as-authored. Target .canvas for just the diagram, --full-page for the whole page.
TSX: convert per references/tsx.md (self-contained React component, no deps).
Artifact (where the environment offers an artifact or page-publishing tool): publish the built HTML with the environment's artifact tool. Everything is already inlined as data URIs, so the artifact's blocked-network sandbox is a non-issue. Prefer this when the user will iterate on the diagram in conversation; pair it with a PNG when they need something to paste elsewhere.
If several formats are requested, build the HTML once and derive the rest from it.
In the footer, credit the icon sources actually used — the source field of each entry in the icons dir's manifest.json (e.g. icons: svgl / devicon / Lucide; source aws reads AWS Architecture Icons, source gcp reads Google Cloud product icons, source azure reads Azure Public Service Icons). Brand logos remain the trademarks of their owners. Keep the template's "made with stack-diagram" link after the credits unless the user asks to remove it; a default PNG captures only the canvas, so the link stays out of it.
Step 7 — Share to the gallery (optional)
Offer this only where you can run shell commands with network access; otherwise skip the step. After delivering, add one line in the user's language offering to share it, with the gallery link so they can look first. For example: "If you'd like to share this diagram, I can post it to the public gallery: https://stacks.caru.moe". Say it once per conversation and never raise it again; never submit without the user's explicit yes.
On a yes, ask for a display name (don't fill it in from gh or git) and whether to add a GitHub login. The login is optional and never shown publicly; it only lets them delete the post later by signing in to the gallery with that account. If gh is signed in, offer the result of gh api user -q .login; include it only if they agree.
Then show exactly what will be sent before sending anything:
the light and dark PNGs — the .canvas pair render_png.py writes (out.png / out-dark.png) — with their paths and every label in them
a title, in plain English even when the conversation isn't. It describes the diagram, not the request. The diagram's own labels stay as they are.
the stack: the technologies in the diagram, by their official names
the display name
the GitHub login, if any, marked as not public
Point out anything that looks internal — hostnames, IPs, customer or company names, internal service names — and suggest re-rendering without it first. Ask them to confirm it is their own system or one they may show publicly, and send only after a second explicit yes on that exact content.
--stack lists the technologies, comma-separated, by their official names. Write Name=key to show a technology's logo beside it in the gallery: key is its entry in the icons dir's manifest.json, and --icons takes that dir (<icons-dir> from Step 2). A name without = goes without a logo, for example --stack "Next.js=nextjs,Hono=hono,Neon" --icons <icons-dir>. The gallery shows only logos from svgl, gilbarbara/logos and devicon; AWS, Google Cloud and Azure product icons, Lucide and logos from a brand's own site or repo go without one.
If share.py rejects a PNG as too large, re-render with a lower --scale and show the new pair before sending.
Tell the user the URL, that a held post appears only after a manual review, and the path where share.py says it saved the delete key. To delete later: python3 scripts/share.py delete <id> (list shows saved posts). If the gallery could confirm the GitHub login they gave, signing in with that account on the gallery deletes it too.
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Create cloud-architecture-style diagrams of tech stacks, system architectures, infra layouts, and service topologies — with real brand logos, grouped containers, and clean orthogonal arrows — delivere
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Über stack-diagram
Create cloud-architecture-style diagrams of tech stacks, system architectures, infra layouts, and service topologies — with real brand logos, grouped containers, and clean orthogonal arrows — delivered as self-contained HTML, a PNG image, a React/TSX component, or a live artifact. Use this skill whenever the user asks for an architecture / system / stack / infra diagram, a tech-stack overview, a service topology, a cloud-vendor-style diagram, or wants tech logos arranged into a picture of how their services connect — in any language, even if they don't name an output format, and even if the tools involved aren't cloud services.
FAQ
Fragen
Wie installiere ich stack-diagram?
Laden Sie skills/stack-diagram/SKILL.md vom Herausgeber herunter oder kopieren Sie den Pfad und öffnen Sie das Repository. PlugMCP listet den Skill und hostet die Datei nicht.
Wo liegt stack-diagram?
Der Herausgeber pflegt es unter https://github.com/caru-ini/stack-diagram.
Welche Agenten können stack-diagram nutzen?
Claude, Cursor, Codex und Grok Build können eine SKILL.md lesen, die Sie aus dem Repository des Herausgebers hinzufügen. Grok Bot installiert sie, wenn Sie den Link zum GitHub-Ordner des Skills in einem Chat senden.
The AWS area follows AWS's own drawing rules. Service icons carry their own square and work on light and dark grounds, so use tile bare: a white tile only doubles the frame. People and generic nodes inside it use AWS's general icons (user:aws/General-User; also General-Users, General-Client, General-Internet, General-Server) in tile bare res with the template's lt/dk pair. Groups use the template's group aws for AWS Cloud (with aws:aws/AWS-Cloud-logo in the label), plus region, az, vpc, private or public for the rest: square corners, outline only, label in ink, no vendor tint, and a 30px icon flush in the corner instead of the 14px one. Inside a VPC, show public and private subnets when you know or can safely infer the split (an internet-facing load balancer in public; app servers and databases in private): a flat VPC is the first thing AWS people notice. Edges inside it use one color and an open arrowhead: <path class="aws" ... marker-end="url(#open)"/>, aws dash for dev/deploy, plain .el labels, and no legend for them. Name nodes Amazon S3 / AWS Fargate, not a bare S3 / Fargate; a short form like ALB goes in the role line, under the full name (Elastic Load Balancing). Names may take two lines, but Amazon / AWS must stay on the first word's line: if it would wrap right after the prefix, widen that node (left:<centerX-76>px; width:152px).
Google Cloud uses Google's own icons. Fetch them with name:gcp/<Product>, read from Google's official packages at run time (e.g. run:gcp/cloud-run, lb:gcp/load-balancing, memorystore:gcp/memorystore). Only core products have their own icon (Cloud Run, Cloud SQL, Cloud Storage, BigQuery, GKE, Compute Engine, Vertex AI...). Every other product uses its category's icon, as Google's guide specifies: Cloud Load Balancing and Cloud CDN both get Networking; Memorystore and Firestore both get Databases. Write the product's name and the script picks the icon. The Cloud / Google prefix is optional, some short forms work (vpc, iam, kms, iap, gce, gcs), and a miss prints every name. gcp/storage is the Storage category; Cloud Storage is gcp/cloud-storage. The slugs gcp-* and google-cloud-* go to the same packages, and what they don't carry FAILs instead of falling back to a third-party copy: those copies are the retired hexagon icons, which Google says not to use. Always write the gcp/ prefix for a product: a bare bigquery still goes through the third-party chain. gcp:google-cloud is the Google Cloud mark for the group label. Gemini and Firebase aren't in the packages: use the bare gemini and firebase. Keep the packages and loose icon files out of repos: Google offers the icons for diagrams and documentation, and redistribution is unconfirmed.
Google Cloud diagrams keep the normal style, with Google's groups. Google's own diagrams (solid blue panel, horizontal cards) are deliberately not copied: icons go on the normal white tile, and edges and the legend stay as usual. Groups use the template's group gcp for Google Cloud (with gcp:google-cloud in the label), plus vpc, region, subnet or zone. A VPC is global and a subnet is regional, so put the region inside the VPC, never the VPC inside a region. Global and serverless services (an external load balancer, Cloud Storage, Cloud Run) stay outside the VPC. Because icons are shared, always write the product's full name (Cloud Load Balancing, not LB), and widen a node whose name would wrap (left:<centerX-76>px; width:152px).
Azure uses Microsoft's own icons. Each service has one: fetch it with name:azure/<Name>, read from Microsoft's official package at run time (e.g. app:azure/app-service, azure:azure/Azure-A, vault:azure/key-vault). The Azure- / Microsoft- prefix and a plural s are optional, common short forms work (aks, vm, vnet, nsg, waf, blob, cosmos, redis, postgres, functions, front-door, apim, ai-search), and a miss prints every name. The slugs azure, microsoft-azure and azure-* go to the same package, and what it doesn't carry FAILs instead of falling back to a third-party copy. Always write the azure/ prefix for a service: a bare cosmos still goes through the third-party chain. Microsoft Entra ID has a separate icon set: pass its official file as name=URL. Microsoft allows these icons in architecture diagrams, training materials and documentation only. Never crop, flip, rotate or reshape one, use it only for the Microsoft service it stands for, and keep the package and loose icon files out of repos.
Azure diagrams keep the normal style, with Microsoft's group colors. Microsoft's own diagrams are deliberately not copied: icons go on the normal white tile, and edges and the legend stay as usual. Groups use the template's group azure for Azure (with azure:azure/Azure-A in the label), plus rg, region, vnet, subnet or zone, and a vnet or subnet label carries its icon (vnet:azure/vnet, subnet:azure/subnet). A VNet belongs to one region, so it goes inside the region. Global services like Front Door stay outside the region. App Service sits outside the VNet unless it runs in an App Service Environment, and a PaaS service reached through a private endpoint can sit inside it with private endpoint as its role. Microsoft asks for the service's full name beside each icon (Azure SQL Database, not SQL), so widen a node whose name would wrap (left:<centerX-76>px; width:152px).
A vendor's rules cover only its own area. The AWS, Google Cloud and Azure rules apply only inside that vendor's group, even when the diagram shows nothing else. Everything outside it, such as a user beside it or an edge that crosses into it, keeps the normal tiles, groups, edges and legend.
Non-brand nodes (user, browser, internet, devices, bare-metal server): copy a glyph from assets/generic/ into the icons dir under the node's name, or use name:lucide/<icon> — don't use emoji. These aren't brand logos, so tinting them to the diagram's ink color is fine (the fetch script does it for Lucide automatically).
Group-label icons render at 14px — they need a square glyph mark. Wordmarks and wide lockups turn to mud at that size; if the main icon is a wordmark, fetch the brand's square icon separately for the label (svgl usually has it; otherwise the project's own icon or favicon file).
Group labels sit on the group's tint, not on a white tile, so in the dark theme a mark with black parts vanishes there. If fetch_icons.py saved <name>_dark, use the template's lt/dk pair in the label; if there is no dark variant and the mark has black parts, add class plate to the label's <img> (white backing, dark theme only).
Raster logos (png/webp) are fine; the build script embeds everything as data URIs, so nothing is loaded at view time.
