Koskamo

Portunus MCP

Portunus is a standalone, boundary-only secret broker that allows AI agents to reference secrets by metadata. It resolves and injects real values only at the execution boundary, ensuring plaintext values never exist in the LLM context, logs, or tool outputs. It supports pluggable backends like GCP Secret Manager and local encryption.

Package and access

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

Portunus MCP logo, by Mathew DostalCommunity listingLocal stdioSource reviewed; not executedPublished by Mathew Dostal
Vendor documentation

What you can do with it

  • Inject secrets into agent execution boundaries without exposing values to the LLM
  • Resolve secrets by metadata using pluggable backends like GCP Secret Manager
  • Manage secret access with approval gates and audit chains

Source and maintenance

Community listingRegistry 0.34.0
mcp-registry: io.github.mdostal/portunus@0.34.0Source repositoryProject website
Maintenance checked

Packages and installation

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

ghcr.io/mdostal/portunus:0.34.0

ocidocker
ghcr.io/mdostal/portunus:0.34.0 package definition
{
  "transport": "stdio",
  "identifier": "ghcr.io/mdostal/portunus:0.34.0",
  "runtimeHint": "docker",
  "registryType": "oci",
  "packageArguments": [
    {
      "type": "positional",
      "value": "mcp"
    }
  ],
  "runtimeArguments": [
    {
      "type": "positional",
      "value": "-i"
    },
    {
      "type": "positional",
      "value": "--rm"
    },
    {
      "name": "-v",
      "type": "named",
      "value": "portunus-home:/home/portunus/.portunus"
    }
  ]
}

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": {
    "portunus-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/mdostal/portunus:0.34.0",
        "mcp"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "portunus-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/mdostal/portunus:0.34.0",
        "mcp"
      ]
    }
  }
}

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": {
    "portunus-mcp": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/mdostal/portunus:0.34.0",
        "mcp"
      ]
    }
  }
}

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": {
    "portunus-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/mdostal/portunus:0.34.0",
        "mcp"
      ]
    }
  }
}

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