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MCP App Workers Template

A production-ready template for building MCP servers on Cloudflare Workers that expose tools with interactive React-based UI widgets, demonstrating anime search functionality using the Jikan API.

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// key findings
⚠️
Known vulnerabilities in dependencies: 11 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
// known CVEs in dependencies11 high5 medium20 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.23.0GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.23.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.23.0GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

highhono@4.10.7GHSA-3vhc-576x-3qv4

Hono JWK Auth Middleware has JWT algorithm confusion when JWK lacks "alg" (untrusted header.alg fallback)

highhono@4.10.7GHSA-88fw-hqm2-52qc

hono: CORS Middleware reflects any Origin with credentials when `origin` defaults to the wildcard

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// required environment variables
This server reads these from process.env. You'll be asked to provide them before it can run.
configINPUTTo build a specific widget, set the environment variable:
// full audit trail
The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.
// improvement guidance — verified publishers only
We have 6 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/khandrew1-mcp-app-doom-3clhgg)](https://m8ven.ai/mcp/khandrew1-mcp-app-doom-3clhgg)
commit: 4e17cdb6bd6678f24fceb4f8e42b145a9a702b66
code hash: bcebf5afeb149072bc8426c09f2dd1671043c7bf75f5e5480b86e1ae9c73ab28
verified: 6/26/2026, 9:48:33 AM
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