Visual Architecture

Create architecture artifacts with the bundled Python renderer instead of hand-writing SVG. v1.6 adds language-aware repo extraction, confidence-scored evidence, deterministic auto-layout, PR delta concern extraction, artifact bundles, quality fail gates, and evidence drilldown in the gallery.

Use this when the user needs a trustworthy system map, agent workflow, sequence, data-flow, lifecycle/state diagram, repo-evidence diagram, or PR delta review sketch that should stay local, deterministic, and reviewable.

Workflow

1. Either extract a language-aware starter spec from a repo or create a JSON file with mode, title, nodes, and edges.
   • Supported modes: architecture, workflow, sequence, dataflow, lifecycle, pr-delta.
   • Supported themes: classic for documentation, showcase for README/release proof images.
2. Snap intended node positions to the renderer grid mentally before writing them:
   • horizontal grid: 120px
   • vertical grid: 80px
3. For repo-aware drafts, extract and layout first:

python3 skills/visual-architecture/scripts/render_architecture.py extract-repo . --output repo-map.json --title "Generated Repo Map"
python3 skills/visual-architecture/scripts/render_architecture.py layout repo-map.json repo-map.layout.json --mode architecture

4. Validate first:

python3 skills/visual-architecture/scripts/render_architecture.py validate input.json --json

5. Deliver the final artifact with a receipt:

python3 skills/visual-architecture/scripts/render_architecture.py deliver input.json output.html --json

Use .svg for a static docs artifact or .html for a self-contained presentation artifact.

For PR delta review, either extract a PR concern map from git refs or compare two specs:

python3 skills/visual-architecture/scripts/render_architecture.py extract-pr --base origin/master --head HEAD --output pr-delta.json
python3 skills/visual-architecture/scripts/render_architecture.py compare base.json head.json pr-delta.html --spec pr-delta.json --json

6. If rsvg-convert is available and you need a bitmap preview, run:

rsvg-convert -o output.png output.svg

JSON Input Structure

{
  "title": "Service Map",
  "mode": "architecture",
  "theme": "classic",
  "summary": "One local request path with async work and model access.",
  "nodes": [
    {
      "id": "web",
      "label": "Web App",
      "subtitle": "User interface",
      "kind": "service",
      "x": 120,
      "y": 160
    },
    {
      "id": "api",
      "label": "API",
      "subtitle": "Business logic",
      "kind": "service",
      "x": 360,
      "y": 160
    }
  ],
  "edges": [
    {
      "from": "web",
      "to": "api",
      "kind": "primary-data",
      "label": "HTTP"
    }
  ]
}

Node Kinds

• service: rounded rectangle
• llm: double-border rounded rectangle
• agent: hexagon
• memory: cylinder

Each node requires:

• id: unique string
• label: primary title
• kind: one of the node kinds above
• x, y: grid-aligned center coordinates

Optional:

• subtitle: smaller secondary label
• show_grid: set true to display the editing grid in the exported SVG
• theme: set showcase on the top-level spec for dark public-facing artifacts
• evidence: object or list with source, optional line/lines, commit, confidence, and note

Edge Kinds

• primary-data: blue solid arrow
• memory-write: green dashed arrow
• control: slate dashed arrow

Each edge requires:

• from: source node id
• to: target node id

Optional:

• label: rendered on the route with a shielding background rect
• source_side, target_side: force edge anchors (left, right, top, bottom)
• via: array of orthogonal turn points, each with x and y
• label_segment: zero-based segment index to place the label on
• label_offset: [dx, dy] shift for fine label placement

Renderer Guarantees

• Validate rejects unsupported node/edge kinds and unknown edge endpoints before rendering
• Deliver writes the artifact atomically and emits a JSON receipt with SHA-256 hashes
• Validation receipts include a quality score for spacing, density, route crossings, and visual overlap
• extract-repo, layout, extract-pr, and bundle turn repo evidence into checked artifacts without hand-placing every node
• --min-quality can fail delivery or bundle export when the artifact is not presentation-grade
• The generated gallery can load spec/receipt JSON and show story steps plus source evidence
• Evidence badges render as SRC n on nodes with source-backed evidence
• PR delta compare writes added/removed node and edge facts into the receipt
• Route arrows orthogonally only
• Render in this order: background, arrows, nodes, labels
• Keep label shields behind arrow text for readability
• Stay restrained: clean strokes, no decorative effects, and hide the editing grid unless explicitly requested

Usage Notes

• Prefer this skill when the user wants architecture diagrams, routing maps, or system relationship visuals.
• Choose semantic kinds first, then place nodes on the grid, then add only the edges needed to explain flow.
• Keep diagrams sparse. If a diagram feels crowded, split it into two files instead of forcing a dense composite.
• Prefer deliver for handoff. A passing render without a receipt is a draft.
• Do not claim repository evidence unless the spec names source files, commits, or confidence explicitly.

Example

Use examples/service-map.json as a generic architecture starting point. Use examples/agent-runtime.json, examples/sequence-cache-miss.json, examples/dataflow-analytics.json, and examples/lifecycle-agent-task.json for the non-architecture modes. Use examples/repo-evidence-map.json for source-pinned evidence, and examples/pr-delta-before.json plus examples/pr-delta-head.json for generated PR deltas.