What is localstack-mcp-server?

A local server that gives coding agents tools for developing and testing cloud applications with LocalStack, a local imitation of AWS services. It runs through an npm package and requires environment variables for access and configuration.

Use it when an agent needs to work with LocalStack or local cloud-development and testing tasks, including setups that use AWS credentials, regions, or replication settings.

It lets you test cloud-related code on your computer instead of relying entirely on live AWS services. This can make local development and testing easier to configure.

localstack-mcp-server — MCP server by localstack

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add mcp/localstack/localstack-mcp-server/localstack-mcp-server

Clone the repo

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

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

localstack-mcp-server 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 yesterday.

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.

server.json · 22 lines

What it actually says

{
  "localstack-mcp-server": {
    "command": "npx",
    "args": [
      "-y",
      "@localstack/localstack-mcp-server"
    ],
    "env": {
      "LOCALSTACK_AUTH_TOKEN": "",
      "AWS_ACCESS_KEY_ID": "",
      "AWS_SECRET_ACCESS_KEY": "",
      "AWS_SESSION_TOKEN": "",
      "AWS_DEFAULT_REGION": "",
      "AWS_REPLICATOR_SOURCE_AWS_ACCESS_KEY_ID": "",
      "AWS_REPLICATOR_SOURCE_AWS_SECRET_ACCESS_KEY": "",
      "AWS_REPLICATOR_SOURCE_AWS_SESSION_TOKEN": "",
      "AWS_REPLICATOR_SOURCE_REGION_NAME": "",
      "AWS_REPLICATOR_SOURCE_ENDPOINT_URL": "",
      "APP_INSPECTOR": ""
    }
  }
}

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.

yesterday First seen · 22 lines scan A 1553ed1cc178

Subscribe to this mod's changes

localstack-mcp-server is an MCP server published in the GitHub repository localstack/localstack-mcp-server (25 stars, last pushed 7d ago), licensed Apache-2.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. 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 2026-08-30.

DevOps and cloud Testing

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