S3 Connector MCP server

🪣 s3-mcp-connector

Talk to Amazon S3 — or LocalStack, MinIO, any S3-compatible store — from an MCP-speaking agent.

A single static Go binary that speaks the Model Context Protocol and exposes 8 tools for working with S3: list buckets, list/read/write/delete objects, create/delete buckets. Point it at real AWS or at a local LocalStack/MinIO instance with one environment variable — same binary, same tools, zero code changes.

No Python, no uv, no runtime dependency to install — just a binary and an .mcp.json.

✨ Why this exists

An agent that can only talk about your S3 buckets isn't that useful.

This gives it hands: it can look inside a bucket, read a config file out

of it, drop a report back in, or clean up a stale prefix — safely, with

guardrails on size and destructive actions built in.

🧰 Tools

Every tool accepts an optional response_format: markdown (default, pretty tables for a chat UI) or json (for programmatic use).

s3getobject auto-detects text vs. binary content and caps output at 200,000 bytes by default (raise via maxbytes, hard cap 5,000,000**) — it's built for reading configs, logs, and small data files, not bulk transfer. Reach for the AWS CLI or SDK directly for large objects.

🚀 Quickstart

Fastest path: grab a prebuilt bundle from the latest release — download s3-mcp-connector-plugin---.zip, unzip it, and point Cowork/Claude at the plugin/ folder inside (see step 4 of SETUP.md). No Go toolchain required.

From source:

# 1. Build
cd go-server
go mod tidy
go build -o s3-connector-server .
cp s3-connector-server ../plugin/servers/go/

Shortened. The full README is on GitHub.