Grammarly MCP Server (BjornMelin/grammarly-mcp) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.
Automates Grammarly's web interface to check AI detection and plagiarism scores, then uses Claude to iteratively rewrite text until it meets target thresholds for humanized content.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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BjornMelin
Source: Glama
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Vercel’s AI SDK's filetype whitelists can be bypassed when uploading files
ANTHROPIC_API_KEYNo\ Anthropic API key. Required when using direct Anthropic provider.CLAUDE_API_KEYNo Claude API key. If not set, uses claude login CLI authGOOGLE_GENERATIVE_AI_API_KEYNo\ Google API key for Gemini models. Also accepts GEMINI_API_KEYIGNORE_SYSTEM_ENVNo false When true, ignores shell env vars and uses only .env file. Prevents IDE-inherited env pollution.OPENAI_API_KEYNo\ OpenAI API key. Required when using OpenAI provider.Tool inputs are validated
Only 0/1 tool handlers declare input schemas (0%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool test coverage
Only 0/1 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 2 high severity in production deps — @modelcontextprotocol/sdk@1.24.3 (high), @modelcontextprotocol/sdk@1.24.3 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
1 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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