figure-spec

name	figure-spec
description	Generate deterministic publication-quality architecture, workflow, and pipeline diagrams from structured JSON (FigureSpec) into editable SVG. Use when user says "架构图", "workflow 图", "pipeline 图", "确定性矢量图", "figure spec", "draw architecture", or needs precise, editable, publication-ready vector diagrams. Preferred over AI illustration for formal architecture/workflow figures.
argument-hint	["description-of-diagram"]
allowed-tools	Bash(*), Read, Write, Edit

FigureSpec: Deterministic JSON → SVG Figure Generation

Generate publication-quality architecture diagrams, workflow pipelines, audit cascades, and system topology figures as editable SVG vector graphics using a deterministic JSON → SVG renderer.

When to Use This Skill

Use figure-spec for:

• System architecture diagrams (layered, hub-and-spoke, multi-plane)
• Workflow / pipeline figures
• Audit cascade / flow-control diagrams
• Any structured diagram where node positions, connections, and groupings are semantically important
• Figures that need to be edited/tweaked later (SVG is plain text)
• Figures where determinism matters (same spec → same SVG)

Do NOT use for:

• Data plots (bar/line/scatter) — use /paper-figure
• Natural/qualitative illustrations — use /paper-illustration
• Quick state-machine / flowchart — use /mermaid-diagram (lighter syntax)

Core Properties

• Deterministic: identical FigureSpec JSON always produces identical SVG output (for a fixed renderer version + fonts)
• Editable: SVG output is plain-text, can be post-edited by hand or programmatically
• Validated: renderer enforces schema, rejects malformed specs with clear error messages
• Shape-aware: edge clipping works correctly for rect/rounded/circle/ellipse/diamond
• CJK support: multi-line labels with proper Chinese character width estimation
• No external API: runs fully local, no network, no API keys

Tool Location

Phase 3.1 (Arch C) move: the canonical implementation now lives at skills/figure-spec/scripts/figure_renderer.py. tools/figure_renderer.py is kept as a backwards-compatible os.execv shim so legacy layers continue to resolve. Codex-side install layouts that previously copied the canonical into ~/.codex/skills/figure-spec/figure_renderer.py must now place it at ~/.codex/skills/figure-spec/scripts/figure_renderer.py to match the new layout (re-run install_aris_codex.sh to pick up the new symlink target).

Resolve $FIGURE_RENDERER via the Codex-side hybrid chain (layer 0 preferred for self-contained owner SKILL; layers 1-4 are legacy shared-runtime compatibility):

# Layer 0: self-contained at the new canonical location (Phase 3.1).
FIGURE_RENDERER=""
if [ -z "${ARIS_REPO:-}" ] && [ -f .aris/installed-skills-codex.txt ]; then
    ARIS_REPO=$(awk -F'\t' '$1=="repo_root"{print $2; exit}' .aris/installed-skills-codex.txt 2>/dev/null) || true
fi
[ -n "${ARIS_REPO:-}" ] && [ -f "$ARIS_REPO/skills/figure-spec/scripts/figure_renderer.py" ] && FIGURE_RENDERER="$ARIS_REPO/skills/figure-spec/scripts/figure_renderer.py"

# Layers 1-3: legacy shared-runtime chain via shim at tools/figure_renderer.py.
[ -z "$FIGURE_RENDERER" ] && [ -n "${ARIS_REPO:-}" ] && [ -f "$ARIS_REPO/tools/figure_renderer.py" ] && FIGURE_RENDERER="$ARIS_REPO/tools/figure_renderer.py"
[ -z "$FIGURE_RENDERER" ] && [ -f tools/figure_renderer.py ] && FIGURE_RENDERER="tools/figure_renderer.py"

# Layer 4: Codex-side skill-local install (`install_aris_codex.sh` may place it here).
[ -z "$FIGURE_RENDERER" ] && [ -f ~/.codex/skills/figure-spec/scripts/figure_renderer.py ] && FIGURE_RENDERER="$HOME/.codex/skills/figure-spec/scripts/figure_renderer.py"
[ -z "$FIGURE_RENDERER" ] && [ -f ~/.codex/skills/figure-spec/figure_renderer.py ] && FIGURE_RENDERER="$HOME/.codex/skills/figure-spec/figure_renderer.py"  # pre-Phase-3.1 layout

[ -n "$FIGURE_RENDERER" ] || {
  echo "ERROR: figure_renderer.py not found at any of: \$ARIS_REPO/skills/figure-spec/scripts/, \$ARIS_REPO/tools/, tools/, ~/.codex/skills/figure-spec/scripts/, ~/.codex/skills/figure-spec/. Set ARIS_REPO, rerun install_aris_codex.sh, or copy the canonical \$ARIS_REPO/skills/figure-spec/scripts/figure_renderer.py next to this skill." >&2
  exit 1
}

python3 "$FIGURE_RENDERER" render <spec.json> --output <out.svg>
python3 "$FIGURE_RENDERER" validate <spec.json>
python3 "$FIGURE_RENDERER" schema

Workflow

Step 1: Understand the Diagram Goal

From $ARGUMENTS (description or path to PAPER_PLAN.md / NARRATIVE_REPORT.md), identify:

• Purpose: architecture, workflow, pipeline, audit cascade, topology?
• Main entities: what are the boxes?
• Relationships: how do they connect? (uses, produces, calls, verifies, chains)
• Grouping: do entities cluster into named regions?
• Hierarchy vs network: stacked layers, left-to-right flow, or central hub?

Step 2: Draft the FigureSpec JSON

Canvas sizing guide:

• Single-column figure: ~500×350 px
• Two-column (full-width): ~900×500 px
• Tall topology: ~700×700 px

Start from a template based on the diagram type:

Architecture (stacked rows):

{
  "canvas": {"width": 900, "height": 520},
  "nodes": [
    {"id": "layer1_label", "label": "Layer 1", "x": 450, "y": 60, ...},
    {"id": "node_a", "label": "A", "x": 180, "y": 120, ...},
    {"id": "node_b", "label": "B", "x": 350, "y": 120, ...}
  ],
  "edges": [...],
  "groups": [
    {"label": "Layer 1", "node_ids": ["node_a", "node_b"], "fill": "#F0F9FF", "stroke": "#BAE6FD"}
  ]
}

Workflow (left-to-right chain):

{
  "canvas": {"width": 900, "height": 300},
  "nodes": [
    {"id": "step1", "label": "Step 1", "x": 100, "y": 150, "shape": "rounded"},
    {"id": "step2", "label": "Step 2", "x": 280, "y": 150, "shape": "rounded"}
  ],
  "edges": [
    {"from": "step1", "to": "step2", "label": "produces"}
  ]
}

Decision diamond:

{"id": "check", "label": "Passes?", "shape": "diamond", "x": 450, "y": 200}

Step 3: Render and Validate

# Validate first
python3 "$FIGURE_RENDERER" validate /tmp/spec.json

# Render to SVG
python3 "$FIGURE_RENDERER" render /tmp/spec.json --output figures/fig_arch.svg

# Convert to PDF for LaTeX inclusion
rsvg-convert -f pdf figures/fig_arch.svg -o figures/fig_arch.pdf

If validation fails, inspect the error (missing field, duplicate ID, overlap warning, invalid hex color) and fix the JSON.

Step 4: Visual Review

Open the SVG/PDF and check:

• No overlaps: nodes don't collide with each other or group boundaries
• Readability: font sizes are consistent, labels aren't clipped
• Edge clarity: arrows hit nodes at clean angles, labels near edges are legible
• Group alignment: background rectangles frame their members cleanly
• Color distinction: categories are visually distinct in both color and grayscale

If issues found, edit the JSON spec (never the generated SVG) and re-render.

Step 5: Iterate with Codex Review (Optional, for High-Stakes Figures)

For paper architecture figures, invoke cross-model review:

spawn_agent:
  model: gpt-5.5
  reasoning_effort: xhigh
  message: |
    Review this SVG figure for a technical paper (architecture / workflow diagram).

    Spec file: /path/to/spec.json
    Rendered: /path/to/fig.svg

    Evaluate:
    1. Clarity (C): can a reader understand the system from this figure alone?
    2. Readability (R): font sizes, label placement, visual hierarchy
    3. Semantic accuracy (S): do relationships match the described system?

    Score each axis 1-10 and list specific issues to fix.

Iterate until all three axes ≥ 7/10. The ARIS tech report figures went through 5 rounds of this loop to reach C:7/R:7/S:8.

Schema Quick Reference

Run python3 "$FIGURE_RENDERER" schema for the authoritative schema.

Nodes

Field	Required	Default	Notes
id	✓	—	Unique
label	✓	—	\n for multi-line
x, y	✓	—	Center coordinates
width, height		120, 50
shape		rounded	rect / rounded / circle / ellipse / diamond
fill, stroke		auto from palette	#RRGGBB
text_color		#333333
font_size		14	Override style default

Edges

Field	Default	Notes
from, to	required	Same = self-loop
label	—	Short edge label
style	solid	solid / dashed / dotted
color	#555555
curve	false	Curved path

Groups

Rectangular background regions framing a set of nodes:

{"label": "Layer Name", "node_ids": ["a", "b", "c"], "fill": "#EFF6FF", "stroke": "#BFDBFE"}

Design Patterns

Pattern 1: Layered Architecture

Stack rows of related nodes, each row is a group, add inter-layer arrows with semantic labels (uses↓, produces↑, checks↓).

Pattern 2: Hub-and-Spoke

Central node (e.g., Executor), peripheral nodes (skills, tools), solid arrows for primary relations, dashed for feedback.

Pattern 3: Pipeline with Feedback

Left-to-right main flow, feedback arrows curve below with curve: true.

Pattern 4: Audit Cascade

Three-stage horizontal cascade with inputs feeding in from top, outputs exiting right, each stage in its own group.

Anti-Patterns

• Don't use groups as hierarchy: groups frame peer nodes, not containment
• Don't nest groups: renderer draws them as background rectangles; nested groups look like Russian dolls
• Don't cross-draw long diagonals: if an arrow crosses 3+ rows, rethink the layout
• Don't mix font sizes for same role: keep one size per node category

Output Contract

• SVG file in figures/ (vector, editable, hand-tweakable)
• Source FigureSpec JSON saved in figures/specs/ for reproducibility
• PDF version via rsvg-convert for LaTeX inclusion

Integration with Other Skills

• /paper-writing (Workflow 3): when illustration: figurespec (default for architecture figures), this skill handles Phase 2b
• /paper-figure: handles data plots; they complement each other (data + architecture = complete figure set)
• /paper-illustration: fallback for figures that need natural/qualitative style (method illustrations with photos, qualitative result grids)
• /mermaid-diagram: lighter alternative for simple flowcharts

Review Tracing

After each reviewer agent call, save the trace following shared-references/review-tracing.md (Policy C — forensic; never silently skip). Use save_trace.sh (resolved per the chain in shared-references/integration-contract.md §2) or write files directly to .aris/traces/<skill>/<date>_run<NN>/. Respect the --- trace: parameter (default: full).