What is mcp-server CLAUDE.md?

Project instructions for a Moleculer MCP server package. Moleculer is a JavaScript microservice framework, while MCP is a way to expose tools that AI clients can call.

Use it when building, type-checking, testing, or extending the server, including its action discovery, validation-schema conversion, examples, and MCP client tests.

It gives contributors the expected file layout, build checks, tests, and important configuration details for this specific server. This reduces setup and consistency errors when changing the package.

How moleculerjs/mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to moleculerjs/mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/moleculerjs/mcp-server/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/moleculerjs/mcp-server

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/moleculerjs/mcp-server/claude-md/github.svg)](https://agentmods.dev/instructions/moleculerjs/mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/moleculerjs/mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/moleculerjs/mcp-server/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/moleculerjs/mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/moleculerjs/mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 595 This file is loaded in full into every session.

When invoked 595 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00595	$0.00595
Opus 5.5	$0.00238	$0.00238
Sonnet 5.5	$0.00119	$0.00119
Haiku 4.5	$0.00060	$0.00060

Measured 2mo ago against content hash ea5ab1285739, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-server CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 60 lines

How it starts

The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.

@moleculer/mcp-server

MCP server mixin for Moleculer API Gateway. Exposes Moleculer microservice actions as MCP tools via Streamable HTTP transport.

File Structure

src/
  index.ts              # Main export: McpServerMixin() function
  types.ts              # TypeScript interfaces (McpServerMixinOptions)
  schema-converter.ts   # fastest-validator → Zod schema conversion
  tool-generator.ts     # Auto-discovery: action registry → MCP tool registration
test/
  index.test.ts         # Integration tests (MCP client ↔ server)
  schema-converter.test.ts  # Schema conversion unit tests
  auto-discovery.test.ts    # Auto-discovery integration tests
  mcp-client.ts         # Test MCP client helper
examples/
  index.ts              # Entry point (module selector)
  simple/
    index.ts            # Simple example (greeter + products)
    products.service.ts # CRUD products service (@moleculer/database)
  client/
    index.ts            # MCP client example

Build & Test Commands

npm run build     # tsc — dual CJS/ESM output to dist/
npm run check     # tsc --noEmit (type check only)
npm test          # vitest --run --coverage
npm run ci        # vitest --watch (development)
npm run lint      # eslint
npm run dev       # nodemon with MCP inspector

Naming Conventions

Variables/functions: camelCase
File names: kebab-case (e.g. schema-converter.ts)
Types/interfaces: PascalCase (e.g. McpServerMixinOptions)
MCP tool names: snake_case (e.g. weather_forecast)
Constants: UPPER_SNAKE_CASE (global), camelCase (local)

Key Options (McpServerMixinOptions)

routeOptions — moleculer-web route config (default path: /mcp)
services — string | string[] — service whitelist or glob pattern
excludeActions — string[] — action name patterns to exclude
exposeBrokerTools — boolean (default: true) — show/hide list_nodes, list_services, etc.
toolNamePrefix — string (default: "") — prefix for auto-generated tool names

Read the full file on GitHub · 60 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 60 lines · 595 tokens per session scan A ea5ab1285739

Subscribe to this mod's changes

mcp-server CLAUDE.md is an instructions file published in the GitHub repository moleculerjs/mcp-server (5 stars, last pushed 7mo ago), licensed MIT. It adds 595 tokens to every session, about $0.0024 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

mcp-server CLAUDE.md next to 6 instructions from other repositories
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mcp-server: Instructions file for Claude Code