Echo MCP
A lightweight server that enables AI agents to emit and validate structured messages through MCP tool call returns. It facilitates reliable programmatic consumption of agent outputs by echoing validated payloads against predefined schemas.
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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ZenlixAI
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
React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE
React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets
React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
React Router: Unauthenticated Denial of Service via Inefficient Route Matching
BUILTIN_SCHEMAS_CONFIGMCP_URLPORTAll four hints declared on every tool
3/3 tools missing one or more hints — list_schemas (missing: idempotentHint); get_schema (missing: idempotentHint); echo (missing: idempotentHint). 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.
Tool test coverage
1/3 tools referenced in tests (33%)
Write tests that reference each tool by name so every tool has at least one test.
No arbitrary install scripts
Has postinstall/preinstall script — runs arbitrary code on npm install
Remove postinstall/preinstall hooks unless they’re essential.
Production dependencies are patched
0 critical, 6 high severity in production deps — react-router@7.13.0 (high), react-router@7.13.0 (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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