# io.github.ofershap/s3 (npm · mcp-server-s3)

AWS S3 MCP — list buckets, browse objects, upload/download, presigned URLs.

- Trust score: 65/100 (medium)
- Change this week: +19
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `mcp-server-s3`: 65/100 (this document), [markdown](https://verifymcp.io/servers/ofershap-s3/mcp-server-s3.md), [page](https://verifymcp.io/servers/ofershap-s3/mcp-server-s3)

## Channel facts

- Registry: `npm`
- Package: `mcp-server-s3`
- Version: `1.0.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 88/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (122 of 126), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (122 of 126), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 145 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 301 tokens (~43/item across 7 items; 7 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### Claude

```bash
claude mcp add ofershap-s3 -- npx -y mcp-server-s3
```

### Codex

```bash
codex mcp add ofershap-s3 -- npx -y mcp-server-s3
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ofershap-s3": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mcp-server-s3"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ofershap-s3 --command npx --arg -y --arg mcp-server-s3
```

### Hermes

```yaml
mcp_servers:
  ofershap-s3:
    command: "npx"
    args: ["-y", "mcp-server-s3"]
```

### Other

```json
{
  "mcpServers": {
    "ofershap-s3": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-s3"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 65, +58)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional regression] Dependency health: partial → unverified
- [functional improvement] License: unverified → pass
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Schema quality: unverified → good
- [functional improvement] Tool coverage: unverified → 100
- [functional] Licence: MIT

### 2026-08-01 (score 7, −21)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-31 (score 28, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (7)

### `list_buckets` (~19 tokens)

List all S3 buckets in your AWS account.

### `list_objects` (~61 tokens)

List objects in an S3 bucket. Optionally filter by prefix and limit count.

Input parameters:

- `bucket` (string, required): Bucket name
- `maxKeys` (integer): Max objects to return
- `prefix` (string): Key prefix (e.g. 'uploads/')

### `get_object` (~39 tokens)

Download and read the contents of an S3 object as text.

Input parameters:

- `bucket` (string, required): Bucket name
- `key` (string, required): Object key

### `put_object` (~61 tokens)

Upload text content to an S3 object.

Input parameters:

- `bucket` (string, required): Bucket name
- `content` (string, required): Content to upload
- `contentType` (string): Content-Type header (default: text/plain)
- `key` (string, required): Object key

### `delete_object` (~35 tokens)

Delete an object from an S3 bucket.

Input parameters:

- `bucket` (string, required): Bucket name
- `key` (string, required): Object key

### `presigned_url` (~59 tokens)

Generate a presigned URL for temporary access to an S3 object.

Input parameters:

- `bucket` (string, required): Bucket name
- `expiresIn` (integer): URL expiry in seconds (default: 1 hour)
- `key` (string, required): Object key

### `bucket_info` (~27 tokens)

Check if a bucket exists and get basic info.

Input parameters:

- `bucket` (string, required): Bucket name

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/ofershap-s3/mcp-server-s3#diagnostics

## Score history

- 2026-08-03: 65
- 2026-08-02: 65
- 2026-08-01: 7
- 2026-07-31: 28
- 2026-07-30: 46
- 2026-07-28: 46
- 2026-07-27: 46

## Links

- npm package: https://www.npmjs.com/package/mcp-server-s3
- Socket report: https://socket.dev/npm/package/mcp-server-s3
- Repository: https://github.com/ofershap/mcp-server-s3
- Changelog RSS feed: https://verifymcp.io/servers/ofershap-s3/mcp-server-s3/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/ofershap-s3/mcp-server-s3/changelog.json
- HTML version of this page: https://verifymcp.io/servers/ofershap-s3/mcp-server-s3