Grades MCP servers on agent usability (A–F) — description quality, schema design, tool naming and token cost, the properties that decide whether a model picks the right tool. Benchmarked across 36 popular servers; a third scored D or F.
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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TengByte
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
undici vulnerable to cross-user information disclosure and parse-time crash via degenerate private cache directives
undici vulnerable to downstream response desynchronization via retry interceptor
undici vulnerable to cross-user information disclosure via whitespace around equals in Cache-Control directives
undici vulnerable to CRLF Injection via blob-like body 'type' property
ANTHROPIC_API_KEYMCPGRADE_HEADERS(repeatable), or set ="Authorization: Bearer …; X-Tenant: acme":MCPLINT_EVAL_API_KEYOPENAI_API_KEYTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
3/3 tools missing one or more hints — grade_mcp_server (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); explain_rule (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_grading_rules (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint). OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Secrets not logged
2 secret values sent to console.log
Redact or omit secret values from log output.
Production dependencies are patched
0 critical, 1 high severity in production deps — undici@8.7.0 (high), undici@8.7.0 (low)
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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[](https://m8ven.ai/mcp/tengbyte-mcpgrade-1jpntm)?variant=verified from the URL.Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.
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