Aws S3SAFE
MCP server to integrate AWS S3 and LLM
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
[](https://github.com/samuraikun/aws-s3-mcp/actions/workflows/test.yml) [](https://github.com/samuraikun/aws-s3-mcp/actions/workflows/docker.yml) [](https://www.npmjs.com/package/aws-s3-mcp) [](https://www.npmjs.com/package/aws-s3-mcp) [](https://opensource.org/licenses/MIT) [](https://nodejs.org/)
An Amazon S3 Model Context Protocol (MCP) server that provides tools for interacting with S3 buckets and objects.
https://github.com/user-attachments/assets/d05ff0f1-e2bf-43b9-8d0c-82605abfb666
Features
🚀 MCP Transport Support
- ✅ STDIO Transport - Direct process communication for Claude Desktop
- ✅ HTTP Transport - REST API with Server-Sent Events for web clients
- ✅ Streamable HTTP - Real-time streaming for responsive interactions
🛠️ Available Tools
- ✅ list-buckets - List accessible S3 buckets with filtering
- ✅ list-objects - Browse objects within buckets with prefix filtering
- ✅ get-object - Retrieve object contents (text/binary support)
🐳 Deployment Options
- ✅ Local Node.js - Direct execution with npm/node
- ✅ Docker CLI - Containerized deployment with custom configuration
- ✅ Docker Compose - Full stack with MinIO for local testing
- ✅ MCP Inspector - Built-in debugging and testing interface
Overview
This MCP server allows Large Language M
502a434129dbOBSERVED · 2026-10-08Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.
claude mcp add aws-s3-mcp --env AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} --env AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} -- npx -y [email protected]{
"mcpServers": {
"aws-s3-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"AWS_ACCESS_KEY_ID": "${AWS_ACCESS_KEY_ID}",
"AWS_SECRET_ACCESS_KEY": "${AWS_SECRET_ACCESS_KEY}"
}
}
}
}Exposed tools (3)
3 read · 0 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
get-object | read | Get object from S3 bucket |
list-buckets | read | List S3 buckets |
list-objects | read | List objects in S3 bucket |
Trust audit
SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- none-observed
- Shell
- none-observed
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (9)
.env.sample
const serverPath = path.resolve(__dirname, "../../dist/index.js");
import { S3Resource } from "../../src/resources/s3";import { createServer } from "../../src/server.js";vi.mock("../../src/resources/s3.js", () => ({vi.mock("../../src/tools/index.js", () => ({@aws-sdk/client-s3, @hono/node-server, @modelcontextprotocol/sdk, dotenv, hono, pdf-parse, ts-pattern, zod-to-json-schema
| `AWS_ACCESS_KEY_ID` | AWS access key (if not using default credentials) | (from AWS config) |
- The server will only access buckets specified in the `S3_BUCKETS` environment variable
Gates applied: no_behavioural_pass.
502a434129dbfull audit observations/trust-audit/mcp-server/samuraikun__aws-s3.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-08 | 502a434129db | SAFE | B | 89 | first audit |
Questions
What is the Aws S3 MCP server?
MCP server to integrate AWS S3 and LLM
What tools does Aws S3 expose?
3 in total: 3 read-only, 0 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is Aws S3 safe to connect to an agent?
The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.
What credentials does Aws S3 need?
It reads AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY from the environment. Give it a token scoped to the least it needs — an agent that can be talked into calling a tool can be talked into calling it with your credentials.
How does Aws S3 run?
It speaks sse, stdio and streamable-http, so it runs as a local process your client starts. It is published on npm as aws-s3-mcp at 0.4.0.
How current is this page?
The grade is for one exact copy of the source (502a434129db), read on 2026-10-08. The repository is watched and re-audited when it changes.