Model Context Protocol server management and tool integration
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Low
Low-risk findings worth noting
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tessl review fix ./src/skills/bundled/mcp/SKILL.mdLow
Low-risk findings.
2 low severity findings. Worth noting, but not necessarily harmful.
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 explicitly supports connecting to external MCP servers (e.g., "brave-search" and "puppeteer" listed in SKILL.md) and its API/CLI (index.ts and the TypeScript examples like listPrompts/getPrompt and callTool/readResource) fetches and returns arbitrary third-party/web content which the agent reads and could materially influence subsequent tool calls or behavior.
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: 0.90). The skill's runtime configuration and examples launch npx to install and run remote packages such as "@modelcontextprotocol/server-filesystem" (e.g., `npx -y @modelcontextprotocol/server-filesystem`) and related @modelcontextprotocol servers, which fetch and execute remote code at runtime and can provide prompts/resources back to the agent, so this is a required external dependency that can execute code and influence agent instructions.
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