B — Some risk signals Graded October 16, 2026Minor concerns worth a quick check.Based on public adoption and transparency signals as of October 16, 2026. Our opinion, not a code audit or security guarantee.
AI agent skill · Developer tools, Design & media
diagram-design
Editorial diagram design for Claude Code, Codex, GitHub Copilot, Cursor, Factory Droid, and Pi. 44 diagram types. Self-contained HTML + SVG. No shadows. No Mermaid slop.
Bottom line: Signal-based grade (4/7 points): very widely starred on GitHub, public source code. This reflects adoption and transparency, not a code audit.
- Popularity score
- 52/100
- Rank
- #80 of 500
- GitHub stars
- 56.2k
What it does
Diagram-design provides a curated collection of 44 diagram types rendered as self-contained HTML + SVG suitable for AI code assistants (Claude, Copilot, Cursor, etc.) to generate programmatically. It eliminates rendering bloat and Mermaid dependencies, enabling clean editorial diagrams directly in agent outputs.
Who it’s for
Engineering leaders, product teams, and builders integrating diagram generation into AI-assisted development workflows who need lightweight, agent-friendly diagram primitives. Teams prioritizing clean rendering over feature maximalism in code documentation and design systems.
Copy-paste setup
Check these steps against the project’s own instructions before running anything.
This is a reference/template library rather than an installable package. Verify against the repo README at https://github.com/cathrynlavery/diagram-design (opens external site) for integration patterns. Most likely use: copy SVG templates into agent prompts or as system context, or reference the HTML examples to teach Claude/Copilot diagram generation. No npm install evident from signals (0 weekly downloads).
Risks
- Prompt injection via diagram content: User-supplied diagram labels/data rendered into SVG could execute scripts if validation is weak; review HTML generation carefully.
- Supply chain via copying: Integrating diagrams directly into agent context means diagram code changes require manual updates across deployments.
- No cryptographic signing: Cannot verify diagram templates haven't been tampered with in transit or storage.
- Maintenance uncertainty: 56k stars but unclear active maintenance cadence; stale templates could contain accessibility or rendering regressions.
- Data in diagram markup: SVG/HTML may be logged by AI providers; sensitive labels should be generalized in prompts.
How to stay secure
Least-privilege permissions
- Restrict diagram-design agent to read-only template access; do not grant write permissions to diagram libraries or storage buckets.
- Sandbox SVG/HTML generation in an isolated execution context; disable script tags and event handlers at the parser level before rendering.
- Limit agent scope to diagram types and layout parameters only; prevent direct HTML/SVG code injection by users through strict input allowlisting.
Network isolation
- Host diagram templates on a private, versioned registry separate from user input channels; never pull templates dynamically from user-controlled URLs.
- Block outbound network calls from the diagram generation process; all templates must be pre-cached and immutable within the agent environment.
- Route all diagram output through content security filters before delivery; strip or escape SVG event attributes (onclick, onload, onerror).
Monitoring
- Log all diagram generation requests with user identity, template type, and label content; flag requests containing SQL, script tags, or command-like syntax.
- Alert on template version mismatches or missing checksums; audit any manual updates to cached diagram libraries against source control.
- Track diagram rendering latency and size; spike detection for oversized markup may indicate attempted payload embedding.
Red flags to watch for
- User labels containing
<script>,javascript:,on*=, or shell metacharacters—reject and require sanitization before retry. - Diagram requests for unlisted types or with raw SVG/HTML injection attempts in the parameters; enforce strict schema validation.
- Supply chain changes: new template dependencies, unsigned updates, or maintenance gaps >6 months without patch releases.
Alternatives
- Mermaid – More feature-rich, widely supported, but heavier and generates some visual cruft; agent-friendly but vendor-dependent rendering.
- PlantUML – Mature diagramming with Java backend; better for complex architectures but requires external service/binary.
- D3.js / Visx – Programmatic and lightweight; overkill for editorial diagrams, higher learning curve for prompt-based generation.
- Excalidraw API – Sketch-style diagrams with JSON export; good for whiteboard-like outputs but not optimized for agent text generation.