concept-diagrams

name concept-diagrams description Generate flat, minimal educational SVG visuals as HTML. version 0.1.0 author v1k22 (original PR), ported into hermes-agent license MIT dependencies [] platforms ["linux","macos","windows"] metadata {"hermes":{"tags":["diagrams","svg","visualization","education","physics","chemistry","engineering"],"related_skills":["architecture-diagram","excalidraw"]}} Concept Diagrams Generate production-quality SVG diagrams with a unified flat, minimal design system. Output is a single self-contained HTML file that renders identically in any modern browser, with automatic light/dark mode. Scope Best suited for: Physics setups, chemistry mechanisms, math curves, biology Physical objects (aircraft, turbines, smartphones, mechanical watches, cells) Anatomy, cross-sections, exploded layer views Floor plans, architectural conversions Narrative journeys (lifecycle of X, process of Y) Hub-spoke system integrations (smart city, IoT networks, electricity grids) Educational / textbook-style visuals in any domain Quantitative charts (grouped bars, energy profiles) Look elsewhere first for: Dedicated software / cloud infrastructure architecture with a dark tech aesthetic (consider architecture-diagram if available) Hand-drawn whiteboard sketches (consider excalidraw if available) Animated explainers or video output (consider an animation skill) If a more specialized skill is available for the subject, prefer that. If none fits, this skill can serve as a general-purpose SVG diagram fallback — the output will carry the clean educational aesthetic described below, which is a reasonable default for almost any subject. Workflow Decide on the diagram type (see Diagram Types below). Lay out components using the Design System rules. Write the full HTML page using templates/template.html as the wrapper — paste your SVG where the template says <!-- PASTE SVG HERE --> . Save as a standalone .html file (for example ~/my-diagram.html or ./my-diagram.html ). User opens it directly in a browser — no server, no dependencies. Optional: if the user wants a browsable gallery of multiple diagrams, see "Local Preview Server" at the bottom. Load the HTML template: skill_view(name="concept-diagrams", file_path="templates/template.html") The template embeds the full CSS design system ( c-* color classes, text classes, light/dark variables, arrow marker styles). The SVG you generate relies on these classes being present on the hosting page. Design System Philosophy Flat : no gradients, drop shadows, blur, glow, or neon effects. Minimal : show the essential. No decorative icons inside boxes. Consistent : same colors, spacing, typography, and stroke widths across every diagram. Dark-mode ready : all colors auto-adapt via CSS classes — no per-mode SVG. Color Palette 9 color ramps, each with 7 stops. Put the class name on a <g> or shape element; the template CSS handles both modes. Class 50 (lightest) 100 200 400 600 800 900 (darkest) c-purple #EEEDFE #CECBF6 #AFA9EC #7F77DD #534AB7 #3C3489 #26215C c-teal #E1F5EE #9FE1CB #5DCAA5 #1D9E75 #0F6E56 #085041 #04342C c-coral #FAECE7 #F5C4B3 #F0997B #D85A30 #993C1D #712B13 #4A1B0C c-pink #FBEAF0 #F4C0D1 #ED93B1 #D4537E #993556 #72243E #4B1528 c-gray #F1EFE8 #D3D1C7 #B4B2A9 #888780 #5F5E5A #444441 #2C2C2A c-blue #E6F1FB #B5D4F4 #85B7EB #378ADD #185FA5 #0C447C #042C53 c-green #EAF3DE #C0DD97 #97C459 #639922 #3B6D11 #27500A #173404 c-amber #FAEEDA #FAC775 #EF9F27 #BA7517 #854F0B #633806 #412402 c-red #FCEBEB #F7C1C1 #F09595 #E24B4A #A32D2D #791F1F #501313 Color Assignment Rules Color encodes meaning , not sequence. Never cycle through colors like a rainbow. Group nodes by category — all nodes of the same type share one color. Use c-gray for neutral/structural nodes (start, end, generic steps, users). Use 2-3 colors per diagram , not 6+. Prefer c-purple , c-teal , c-coral , c-pink for general categories. Reserve c-blue , c-green , c-amber , c-red for semantic meaning (info, success, warning, error). Light/dark stop mapping (handled by the template CSS — just use the class): Light mode: 50 fill + 600 stroke + 800 title / 600 subtitle Dark mode: 800 fill + 200 stroke + 100 title / 200 subtitle Typography Only two font sizes. No exceptions. Class Size Weight Use th 14px 500 Node titles, region labels ts 12px 400 Subtitles, descriptions, arrow labels t 14px 400 General text Sentence case always. Never Title Case, never ALL CAPS. Every <text> MUST carry a class ( t , ts , or th ). No unclassed text. dominant-baseline="central" on all text inside boxes. text-anchor="middle" for centered text in boxes. Width estimation (approx): 14px weight 500: ~8px per character 12px weight 400: ~6.5px per character Always verify: box_width >= (char_count × px_per_char) + 48 (24px padding each side) Spacing & Layout ViewBox : viewBox="0 0 680 H" where H = content height + 40px buffer. Safe area : x=40 to x=640, y=40 to y=(H-40). Between boxes : 60px minimum gap. Inside boxes : 24px horizontal padding, 12px vertical padding. Arrowhead gap : 10px between arrowhead and box edge. Single-line box : 44px height. Two-line box : 56px height, 18px between title and subtitle baselines. Container padding : 20px minimum inside every container. Max nesting : 2-3 levels deep. Deeper gets unreadable at 680px width. Stroke & Shape Stroke width : 0.5px on all node borders. Not 1px, not 2px. Rect rounding : rx="8" for nodes, rx="12" for inner containers, rx="16" to rx="20" for outer containers. Connector paths : MUST have fill="none" . SVG defaults to fill: black otherwise. Arrow Marker Include this <defs> block at the start of every SVG: < defs > < marker id = "arrow" viewBox = "0 0 10 10" refX = "8" refY = "5" markerWidth = "6" markerHeight = "6" orient = "auto-start-reverse" > < path d = "M2 1L8 5L2 9" fill = "none" stroke = "context-stroke" stroke-width = "1.5" stroke-linecap = "round" stroke-linejoin = "round" /> </ marker > </ defs > Use marker-end="url(#arrow)" on lines. The arrowhead inherits the line color via context-stroke . CSS Classes (Provided by the Template) The template page provides: Text: .t , .ts , .th Neutral: .box , .arr , .leader , .node Color ramps: .c-purple , .c-teal , .c-coral , .c-pink , .c-gray , .c-blue , .c-green , .c-amber , .c-red (all with automatic light/dark mode) You do not need to redefine these — just apply them in your SVG. The template file contains the full CSS definitions. SVG Boilerplate Every SVG inside the template page starts with this exact structure: < svg width = "100%" viewBox = "0 0 680 {HEIGHT}" xmlns = "http://www.w3.org/2000/svg" > < defs > < marker id = "arrow" viewBox = "0 0 10 10" refX = "8" refY = "5" markerWidth = "6" markerHeight = "6" orient = "auto-start-reverse" > < path d = "M2 1L8 5L2 9" fill = "none" stroke = "context-stroke" stroke-width = "1.5" stroke-linecap = "round" stroke-linejoin = "round" /> </ marker > </ defs > <!-- Diagram content here --> </ svg > Replace {HEIGHT} with the actual computed height (last element bottom + 40px). Node Patterns Single-line node (44px): < g class = "node c-blue" > < rect x = "100" y = "20" width = "180" height = "44" rx = "8" stroke-width = "0.5" /> < text class = "th" x = "190" y = "42" text-anchor = "middle" dominant-baseline = "central" > Service name </ text > </ g > Two-line node (56px): < g class = "node c-teal" > < rect x = "100" y = "20" width = "200" height = "56" rx = "8" stroke-width = "0.5" /> < text class = "th" x = "200" y = "38" text-anchor = "middle" dominant-baseline = "central" > Service name </ text > < text class = "ts" x = "200" y = "56" text-anchor = "middle" dominant-baseline = "central" > Short description </ text > </ g > Connector (no label): < line x1 = "200" y1 = "76" x2 = "200" y2 = "120" class = "arr" marker-end = "url(#arrow)" /> Container (dashed or solid): < g class = "c-purple" > < rect x = "40" y = "92" width = "600" height = "300" rx = "16" stroke-width = "0.5" /> < text class = "th" x = "66" y = "116" > Container label </ text > < text class = "ts" x = "66" y = "134" > Subtitle info </ text > </ g > Diagram Types Choose the layout that fits the subject: Flowchart — CI/CD pipelines, request lifecycles, approval workflows, data processing. Single-direction flow (top-down or left-right). Max 4-5 nodes per row. Structural / Containment — Cloud infrastructure nesting, system architecture with layers. Large outer containers with inner regions. Dashed rects for logical groupings. API / Endpoint Map — REST routes, GraphQL schemas. Tree from root, branching to resource groups, each containing endpoint nodes. Microservice Topology — Service mesh, event-driven systems. Services as nodes, arrows for communication patterns, message queues between. Data Flow — ETL pipelines, streaming architectures. Left-to-right flow from sources through processing to sinks. Physical / Structural — Vehicles, buildings, hardware, anatomy. Use shapes that match the physical form — <path> for curved bodies, <polygon> for tapered shapes, <ellipse> / <circle> for cylindrical parts, nested <rect> for compartments. See references/physical-shape-cookbook.md . Infrastructure / Systems Integration — Smart cities, IoT networks, multi-domain systems. Hub-spoke layout with central platform connecting subsystems. Semantic line styles ( .data-line , .power-line , .water-pipe , .road ). See references/infrastructure-patterns.md . UI / Dashboard Mockups — Admin panels, monitoring dashboards. Screen frame with nested chart/gauge/indicator elements. See references/dashboard-patterns.md . For physical, infrastructure, and dashboard diagrams, load the matching reference file before generating — each one provides ready-made CSS classes and shape primitives. Validation Checklist Before finalizing any SVG, verify ALL of the following: Every <text> has class t , ts , or th . Every <text> inside a box has dominant-baseline="central" . Every connector <path> or <line> used as arrow has fill="none" . No arrow line crosses through an unrelated box. box_width >= (longest_label_chars × 8) + 48 for 14px text. box_width >= (longest_label_chars × 6.5) + 48 for 12px text. ViewBox height = bottom-most element + 40px. All content stays within x=40 to x=640. Color classes ( c-* ) are on <g> or shape elements, never on <path> connectors. Arrow <defs> block is present. No gradients, shadows, blur, or glow effects. Stroke width is 0.5px on all node borders. Output & Preview Default: standalone HTML file Write a single .html file the user can open directly. No server, no dependencies, works offline. Pattern: # 1. Load the template template = skill_view( "concept-diagrams" , "templates/template.html" )