excalidraw-diagram
Create Excalidraw diagram JSON files that make visual arguments. Use when the user wants to visualize workflows, architectures, or concepts.
59
68%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Advisory
Suggest reviewing before use
Optimize this skill with Tessl
npx tessl skill review --optimize ./SKILL.mdSecurity
2 findings — 2 medium severity. This skill can be installed but you should review these findings before use.
W011: Third-party content exposure detected (indirect prompt injection risk)
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
Third-party content exposure detected (high risk: 0.80). The skill's SKILL.md Research Mandate explicitly requires the agent to "look up the actual JSON/data formats" and "find the real event names, method names, or API endpoints" (i.e., fetch public specs/webpages) — and the rendering template also pulls a module from https://esm.sh — meaning the agent is expected to ingest open/public third‑party content that can materially influence its generation and subsequent actions.
W012: Unverifiable external dependency detected (runtime URL that controls agent)
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
Potentially malicious external URL detected (high risk: 0.90). The render_template.html used at runtime by references/render_excalidraw.py performs a dynamic import from https://esm.sh/@excalidraw/excalidraw?bundle which causes the agent's renderer to fetch and execute remote JavaScript during rendering, and the skill requires that import to render diagrams.
- Repository
- coleam00/excalidraw-diagram-skill
- Commit
8646fcc
- Audited
- Security analysis
Is this your skill?
If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.