MCP Comparison
Filesystem vs AWS S3
Updated: April 16, 2026
Verdict
Filesystem MCP reads and writes files on the machine running the MCP server. S3 MCP reads and writes objects in an S3 bucket. Pick filesystem for local agent work; pick S3 when files need to live in the cloud for persistence or sharing.
Pick Filesystem if...
- +The agent runs locally and needs local files
- +You want no cloud dependency
- +You sandbox the agent with allowed-paths
- +Local scripts and configs are the data
- +You do not need cross-machine access
Pick AWS S3 if...
- +Files must live in the cloud for durability
- +You share files across many machines or agents
- +You want IAM-based access control
- +Large volumes of objects are the data
- +You already use S3 for storage
Feature comparison
| Feature | Filesystem | AWS S3 |
|---|---|---|
| Primary focus | read and write files on the local filesystem | read and write S3 objects and buckets |
| Vendor / maintainer | Anthropic (reference) | community |
| Implementation language | TypeScript | Python |
| License | MIT | MIT |
| Pricing | free, OSS | free server, S3 storage billed separately |
| Authentication | none (allowed-paths list) | AWS credentials |
| Transport | stdio | stdio |
| Official homepage | github.com/modelcontextprotocol/servers | github.com/aws-samples/sample-mcp-server-s3 |
Frequently asked questions
Which MCP server is faster to set up, Filesystem MCP or S3 MCP?
Filesystem MCP typically installs via a single npm or pip command and asks for none (allowed-paths list). S3 MCP needs AWS credentials. Expect 2-5 minutes for either once credentials are ready. If you already have none configured, Filesystem MCP wins by a minute or two.
Can I run Filesystem MCP and S3 MCP side by side in the same Claude client?
Yes. Claude Desktop, Cursor, and Claude Code all accept multiple MCP servers in the same config file. Each runs in its own process and exposes a distinct tool namespace, so there are no naming collisions. Memory usage is additive; budget roughly 40-80 MB per server.
How do Filesystem MCP and S3 MCP compare on cost?
Filesystem MCP is free, OSS. S3 MCP is free server, S3 storage billed separately. Most of the real spend is on the underlying service, not the MCP server itself; the server is almost always free. Budget based on query volume at the backend, not the MCP layer.
Is Filesystem MCP or S3 MCP more production-ready?
Filesystem MCP is maintained by Anthropic (reference), which tends to mean faster fixes. S3 MCP is community-maintained too; same diligence applies. For critical workloads, pick the vendor-backed option or pin a specific version.
What authentication does each server need?
Filesystem MCP authenticates with none (allowed-paths list). S3 MCP uses AWS credentials. Store secrets in a password manager or your shell's keychain and inject them via environment variables; never commit them to the MCP config file, which is often synced across machines.
Which one should I pick first if I am just starting with MCP?
Start with whichever backend you already pay for or use daily. If you do not use either yet, Filesystem MCP is fully OSS, so there is no signup friction. You can always add the second one later without disrupting the first.