Hybrid S3 MCP Server - install, status & alternatives [2026]

01 · Install Hybrid S3

before you install - you'll need

The README does not document required environment variables for a basic install.

Docker

docker run -i --rm docker.io/psyb0t/hybrids3:v0.3.8

Claude Desktop - add to config

{
  "mcpServers": {
    "psyb0t-docker-hybrids3": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "docker.io/psyb0t/hybrids3:v0.3.8"
      ]
    }
  }
}

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as container (OCI image) - can be sandboxed away from your filesystem

license WTFPL - declared in the repository

registry namespace io.github.psyb0t is GitHub-verified and matches the repo owner

03 · What Hybrid S3 can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can upload text or base64-encoded binary. Content type auto-detected if not specified, download object content. Returns text or base64-encoded binary. Objects over 50 MB cannot be downloaded via MCP - use the HTTP API directly, delete an object, and list objects with optional prefix filter. Default 100 results, max 1000.

Capability map

Tools grouped from the project's README - what Hybrid S3 lets an agent do.

read & search

2 tools - e.g. List objects with optional prefix filter. Default 100 results, max 1000.; Master key lists all buckets. Bucket key lists only that bucket.

list_objects · list_buckets

create & write

1 tool - e.g. Upload text or base64-encoded binary. Content type auto-detected if not specified.

upload_object

Download

1 tool - e.g. Download object content. Returns text or base64-encoded binary. Objects over 50 MB cannot be downloaded via MCP - use the HTTP API directly.

download_object

delete

1 tool - e.g. Delete an object.

delete_object

Object

1 tool - e.g. Get object metadata (size, content type, ETag, expiry time) without downloading the content.

object_info

Presign

1 tool - e.g. Generate a shareable URL. Pass method="GET" (default) or method="PUT". GET on a public bucket returns a plain URL; everything else is a signed expiring URL.

presign_url

Limitations (from the README)

- No multipart upload (S3's chunked upload protocol) - No object versioning - No ACLs beyond bucket-level public/private - No bucket creation or deletion via API - buckets are defined in config - No CORS headers - add these at the reverse proxy layer if needed - No replication - No encryption at rest

Latest releases

v0.3.8 · 2026-08-01

v0.3.7 · 2026-07-27

v0.3.6 · 2026-07-27

04 · Who maintains Hybrid S3

HybridS3 is maintained by psyb0t. We track 13 MCP servers from psyb0t - 13 actively maintained, 126 combined GitHub stars, oldest repo from Jun 2025. Full record: all servers from psyb0t.

05 · Facts

repository: github.com/psyb0t/docker-hybrids3
category: cloud infrastructure - ranked #140 of 153 actively-maintained cloud infrastructure servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-08-01)
registry: io.github.psyb0t/hybrids3 (active, first published 2026-07-26 · 6 versions)
packages: oci:docker.io/psyb0t/hybrids3:v0.3.8

06 · Hybrid S3 FAQ

Is Hybrid S3 still maintained?

Yes - as of 2026-09-18, its last commit was 2026-08-01 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

What can Hybrid S3 do?

With this server connected, an agent can upload text or base64-encoded binary. Content type auto-detected if not specified, download object content. Returns text or base64-encoded binary. Objects over 50 MB cannot be downloaded via MCP - use the HTTP API directly, delete an object, and list objects with optional prefix filter. Default 100 results, max 1000.

How do I install Hybrid S3?

Run `docker run -i --rm docker.io/psyb0t/hybrids3:v0.3.8`. The README does not document required environment variables for a basic install. You can also paste the ready-made client config above.

07 · Alternatives to Hybrid S3

Alternatives to Hybrid S3

Maintained cloud infrastructure servers if Hybrid S3 isn't the fit.

Pairs well with

Servers that cover what Hybrid S3 doesn't - only shown when the pairing reason fits the companion.

More cloud infrastructure MCP servers · Talkies · DynamoDB · Fly Io · GCS · S3 (pulsemcp)