Install Playwright MCP server for browser automation in Claude Code
63
52%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Advisory
Suggest reviewing before use
Optimize this skill with Tessl
npx tessl skill review --optimize ./plugins/claude-code-dev/skills/install-playwright-mcp/SKILL.mdSecurity
2 findings — 2 medium severity. This skill can be installed but you should review these findings before use.
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.
Third-party content exposure detected (high risk: 0.90). This skill installs a Playwright MCP server and explicitly exposes browser automation tools (e.g., "browser_navigate", "browser_click", "browser_snapshot") and even instructs testing with "Navigate to google.com and take a snapshot" in SKILL.md, which means the agent can fetch and read arbitrary public web pages (untrusted third‑party content) that can influence its subsequent actions.
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.
Potentially malicious external URL detected (high risk: 1.00). The skill installs and runs remote code at runtime via the command "npx @playwright/mcp@latest", which downloads and executes an external package required for the MCP server, so this is a runtime fetch that executes remote code (flagged: npx @playwright/mcp@latest).
0ebe7ae
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.