Five concrete outcomes
- Tool schemas LLMs invoke correctly the first time. Naming, parameter clarity, schema precision rules end the "the model called it wrong" loop.
- Transports that don't drop events. stdio + HTTP + WebSocket with backpressure — covered by one rule.
- Errors are spec-compliant. Proper MCP error shape and codes — not ad-hoc strings the client can't parse.
- Per-tool rate limits + audit logging. Quota tracking, abuse detection, structured invocation logs with retention rules.
- Marketplace submission packaged. Anthropic Plugin Marketplace + Smithery + Glama + Aevrix Hub submission patterns covered.
What's inside
12 enforceable .mdc rule files + bundled CLAUDE.md + working reference/python/mcp_server.py AND reference/typescript/mcp_server.ts — both ~300 LOC scaffolds with the same five-tool surface.
mcp-inspector integration + custom test harness.FAQ
I'm building my first MCP server. Is this for me?
Yes. The reference scaffolds in both Python and TypeScript are deliberately the simplest end-to-end MCP servers that still respect every rule in the pack. They're a faster start than the official MCP samples and harder to get wrong.
I already have an MCP server. Is this for me?
Also yes. The audit-logging, rate-limiting, multi-tenancy, marketplace-submission, and paid-pricing rules apply equally to a server you already have. Drop the rules in and your next iteration will fix the rough edges.
Does this cover the Anthropic Plugin Marketplace specifically?
Yes — marketplace-submission.mdc covers the May 2026 Anthropic submission flow including manifest fields, screenshots, README requirements, and 0% revenue share path. It also covers Smithery, Glama, and the upcoming Aevrix Hub.
Personal vs Commercial?
Personal is one developer, unlimited Personal Projects. Commercial covers an entire legal entity, paid client work, internal forking. See LICENSE.
Updates and refunds?
Patch-level v1.x updates free for life of license. 14-day no-questions refund through Lemon Squeezy.
Available now
Instant download after payment. 14-day no-questions refund. Crypto via Cryptomus; card via Lemon Squeezy (Merchant of Record — handles VAT, receipts, and refunds).