---
title: "Discussion on \"Six ${VAR} forms, five .mcp.json fields, two tiny servers: what Claude Code MCP expansion actually produced\" | Hashnode"
description: "Discussion on \"Six ${VAR} forms, five .mcp.json fields, two tiny servers: what Claude Code MCP expansion actually produced\". I put six environment-variable forms into the args, env and command fields of one project .mcp.json (plus url and headers on a second, HTTP server) and read back what the server process actually recei"
url: "https://hashnode.com/posts/six-var-forms-five-mcp-json-fields-two-tiny-servers-what-claude-code-mcp-expansion-actually-produced/6aba8753848b4b1ccbe226f6"
---

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# [Six ${VAR} forms, five .mcp.json fields, two tiny servers: what Claude Code MCP expansion actually produced](https://rulestack.hashnode.dev/six-var-forms-five-mcp-json-fields-two-tiny-servers-what-claude-code-mcp-expansion-actually-produced?utm_source=hashnode&utm_medium=feed)

I put six environment-variable forms into the args, env and command fields of one project .mcp.json (plus url and headers on a second, HTTP server) and read back what the server process actually recei

Sep 28 · 12 min read · rulestack.hashnode.dev  
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