# Markproof (npm · markproof-mcp)

Watermark and C2PA-sign AI-generated images and audio for EU AI Act Article 50, and verify files.

- Trust score: 67/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `markproof-mcp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp.md), [page](https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp)

## Channel facts

- Registry: `npm`
- Package: `markproof-mcp`
- Version: `0.3.3`
- 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 2026-11-05.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 30 of 92 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 19/100
  - Repository check failed: no source repository is declared.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 1 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 474 tokens (~158/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **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.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Markproof MCP server?

Markproof runs locally as an npm package, launched with npx -y markproof-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add ajinkya710-markproof -- npx -y markproof-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "ajinkya710-markproof": {
      "command": "npx",
      "args": [
        "-y",
        "markproof-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ajinkya710-markproof": {
      "command": "npx",
      "args": [
        "-y",
        "markproof-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add ajinkya710-markproof -- npx -y markproof-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ajinkya710-markproof": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "markproof-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ajinkya710-markproof --command npx --arg -y --arg markproof-mcp
```

### Hermes

```yaml
mcp_servers:
  ajinkya710-markproof:
    command: "npx"
    args: ["-y", "markproof-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "ajinkya710-markproof": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "markproof-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add ajinkya710-markproof -t stdio -c npx -a -y markproof-mcp
```

### Other

```json
{
  "mcpServers": {
    "ajinkya710-markproof": {
      "command": "npx",
      "args": [
        "-y",
        "markproof-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-11-05 (score 67, +16)

- [security improvement] Malware scan: unverified → pass

### 2026-11-04 (score 51, −15)

- [security regression] Malware scan: pass → unverified
- [functional regression] Security disclosure: unverified → fail
- [functional] Package version: 0.3.2 → 0.3.3

### 2026-11-03 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 65)

First indexed and scored.

## MCP tools (3)

### `mark_file` (~281 tokens)

Mark an AI-generated file

Adds an invisible watermark and a signed C2PA manifest (Content Credentials) to an AI-generated image (PNG, JPEG, WebP) or audio file (WAV, MP3), marking it as AI-generated for EU AI Act Article 50. Writes the marked copy next to the original (images as PNG, audio as WAV) and returns its watermark code and public verification URL. Use this on every image or audio file you generate before handing it to a user. Counts as one API call.

Input parameters:

- `generator_name` (string): Name of the app or system that generated the file; recorded in the C2PA manifest.
- `label_position` (string): Corner for visible_label. Defaults to bottom-right.
- `model_name` (string): Name of the model that generated the file.
- `output_path` (string): Where to write the marked copy. Defaults to <name>.marked.<ext> beside the original.
- `overwrite` (boolean): Allow replacing an existing file at output_path. Defaults to false.
- `path` (string, required): Path to the local image or audio file to mark.
- `visible_label`: Images only. Also draw a visible label on the image (EU AI Act Art. 50(4), e.g. for deepfakes): true for "AI-generated", or custom text up to 40 characters.

### `verify_file` (~144 tokens)

Check a file for AI marking

Checks an image or audio file for a Markproof watermark and a C2PA manifest, and reports whether its signature is valid and whether it matches a record in this Markproof account. Use it to confirm a file is marked before publishing, or to inspect a file of unknown origin. Counts as one API call.

Input parameters:

- `path` (string): Path to the local image or audio file to check. Uploads are limited to about 4.5 MB.
- `url` (string): Public https URL of the file, instead of path. Use it for files over 4.5 MB (up to 25 MB), e.g. marked audio, which is WAV.

### `get_asset` (~49 tokens)

Look up a marked file

Fetches the record for a file this account marked, by the asset_id that mark_file returned. Doesn't count toward the quota.

Input parameters:

- `asset_id` (string, required): The asset_id returned by mark_file.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp#diagnostics

## Score history

- 2026-11-05: 67
- 2026-11-04: 51
- 2026-11-03: 66
- 2026-11-02: 65
- 2026-11-01: 65

## Common questions

### What is the Markproof MCP server?

Markproof is an MCP server listed in the public MCP registry as io.github.Ajinkya710/markproof. Watermark and C2PA-sign AI-generated images and audio for EU AI Act Article 50, and verify files. This page covers its npm package (markproof-mcp).

### Is the Markproof MCP server safe to use?

Markproof scores 67 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Markproof MCP server expose?

Markproof exposes 3 tools: mark_file, verify_file, get_asset. Their descriptions and schemas cost roughly 474 tokens of context every time the server is loaded.

### Is the Markproof MCP server still maintained?

Markproof is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Markproof MCP server under?

Markproof declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

### What did VerifyMCP test on the Markproof MCP server?

VerifyMCP ran 16 checks on Markproof, covering Malware scan, Known CVEs, Install scripts, Dependency health and 12 more. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/markproof-mcp
- Socket report: https://socket.dev/npm/package/markproof-mcp
- Website: https://markproof.co/docs
- Changelog RSS feed: https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp.json
- HTML version of this page: https://verifymcp.io/servers/ajinkya710-markproof/markproof-mcp