HiddenContent MCP

An MCP server that allows AI agents to check documents for hidden text before processing them. It supports PDF, Office, RTF, and HTML formats, providing a verdict and findings on potential hidden content techniques.

Visit HiddenContent.ai

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Vendor evidenceLocal stdioSource reviewed; not executedOperated by HiddenContent.ai

You need:Store the token now — only its hash is kept, so it is shown exactly once.

Vendor documentation

What you can do with it

Check documents for hidden text before reading
Analyze PDF, Office, RTF, and HTML files
Run local server to keep files on machine

Source and maintenance

Vendor evidenceRegistry 0.4.15

mcp-registry: ai.hiddencontent/mcp@0.4.15 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@hiddencontent/mcp 0.4.15

npm

@hiddencontent/mcp package definition

{
  "version": "0.4.15",
  "transport": "stdio",
  "identifier": "@hiddencontent/mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "HCS_API_TOKEN",
      "isRequired": true,
      "description": "API token for the HiddenContent service. Get one at https://hiddencontent.ai/start?ref=mcp-registry — the server refuses to start without it and says so."
    },
    {
      "name": "HCS_URL",
      "description": "Base URL of the service. Defaults to the hosted API; set it only when pointing at a self-hosted instance."
    },
    {
      "name": "HCS_CAPABILITIES",
      "description": "Comma-separated list of what your agent can actually do. The only accepted values are `tool-use`, `network-egress` and `code-execution`. These turn on the checks for concealed text that instructs a model to call a tool, send data or run code — declaring more can raise severity and never lowers it, and declaring nothing leaves those checks inert. Defaults to `tool-use` in the bundle install."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "hiddencontent-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@hiddencontent/mcp@0.4.15"
      ],
      "env": {
        "HCS_API_TOKEN": "<YOUR_HCS_API_TOKEN>",
        "HCS_URL": "<YOUR_HCS_URL>",
        "HCS_CAPABILITIES": "<YOUR_HCS_CAPABILITIES>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "hiddencontent-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@hiddencontent/mcp@0.4.15"
      ],
      "env": {
        "HCS_API_TOKEN": "<YOUR_HCS_API_TOKEN>",
        "HCS_URL": "<YOUR_HCS_URL>",
        "HCS_CAPABILITIES": "<YOUR_HCS_CAPABILITIES>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "hiddencontent-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@hiddencontent/mcp@0.4.15"
      ],
      "env": {
        "HCS_API_TOKEN": "<YOUR_HCS_API_TOKEN>",
        "HCS_URL": "<YOUR_HCS_URL>",
        "HCS_CAPABILITIES": "<YOUR_HCS_CAPABILITIES>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "hiddencontent-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@hiddencontent/mcp@0.4.15"
      ],
      "env": {
        "HCS_API_TOKEN": "<YOUR_HCS_API_TOKEN>",
        "HCS_URL": "<YOUR_HCS_URL>",
        "HCS_CAPABILITIES": "<YOUR_HCS_CAPABILITIES>"
      }
    }
  }
}

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