deno-mcp-template
A template for building production-ready MCP servers in TypeScript with Deno, providing both STDIO and HTTP transports, middleware (rate limiting/CORS/security headers/timeouts), persistent state via Deno KV, session resumability, sandboxed execution utilities, example MCP tools/resources/prompts, and CI/CD plus multiple distribution formats (JSR, native binary, DXT, Deno Deploy).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Template includes HTTPS/TLS options, bearer token or x-api-key auth for /mcp, CORS restrictions (no wildcard), DNS rebinding/host allow-list guidance for non-loopback exposure, and rate limiting with proxy-aware behavior. It also provides sandboxed execution utilities and fetch-website-info URL allowlisting to reduce SSRF risk. Scope granularity appears coarse (single token for access rather than fine-grained scopes). Dependency hygiene cannot be verified from the provided README alone.
⚡ Reliability
Best When
You want a reusable Deno-based codebase scaffold that already wires together MCP transports, state, and safety-related middleware, and you plan to customize the provided example tools/resources/prompts.
Avoid When
You cannot enforce HTTPS/auth at the deployment layer or you lack the operational ability to configure allowed hosts/origins, reverse proxy behavior, and Deno permissions appropriately.
Use Cases
- • Bootstrapping a new MCP server quickly (STDIO for desktop clients, HTTP for remote clients)
- • Building tool/resource/prompt based integrations with persistent KV-backed state
- • Adding sandboxed tool execution for untrusted code paths
- • Providing URL-mode and session-based flows for interactive elicitation (browser pages via HTTP paths)
- • Packaging and deploying the same server across JSR, binaries, DXT, and Deno Deploy
Not For
- • A drop-in managed hosted MCP API (this is an application/template you run/deploy)
- • Production use without configuring security settings (auth, allowed origins/hosts, and transport exposure)
- • Systems needing strong enterprise compliance guarantees out-of-the-box (template includes guidance but not evidence of audits)
Interface
Authentication
HTTP auth is optional by configuration; template includes a startup failure mode when MCP_REQUIRE_HTTP_AUTH=true is set and no token is provided. It also intentionally skips bearer auth for /mcp-elicitation/* routes.
Pricing
No pricing model is described for the template itself; costs depend on how you deploy and run the resulting server (local/VM/Deploy).
Agent Metadata
Known Gotchas
- ⚠ HTTP auth may be required in production via MCP_REQUIRE_HTTP_AUTH; agents should ensure headers/tokens are configured.
- ⚠ Requests to /mcp-elicitation/* may intentionally bypass bearer auth, which can be a security consideration for exposing the service broadly.
- ⚠ If binding to non-loopback interfaces, additional DNS rebinding/host allow-list settings are required (MCP_ALLOWED_HOSTS/MCP_DNS_REBINDING).
- ⚠ Outbound/in-tool networking may require explicit Deno permissions; the README warns about moving from -A to explicit permissions.
Alternatives
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Scores are editorial opinions as of 2026-03-30.