mcp-exec MCP

An open-source MCP server that provides a single 'exec' tool to run caller-supplied Python code within a secure, network-isolated sandbox. It supports stdio, HTTP, and SSE transports, enforcing strict security invariants such as no network access, non-root execution, and resource limits to safely execute code without flooding the agent's context with multiple tool schemas.

Package and access

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

Community listingLocal stdioSource reviewed; not executedPublished by inhuman

You need:--tmpfs /tmp is required: the rootfs is read-only, and each run needs a writable ephemeral workspace (cleaned up after).

Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

Popularity 1 GitHub star

What you can do with it

Execute Python scripts in a secure sandbox
Run data analysis code with numpy/pandas
Generate plots using matplotlib safely
Orchestrate agent tasks via code execution

Source and maintenance

Community listingRegistry 0.5.4MIT

mcp-registry: io.github.inhuman/mcp-exec@0.5.4 Source repository

Last repository push: Jul 20, 2026, 9:37 AM UTC
Maintenance checked: Nov 2, 2026, 5:14 PM UTC

Packages and installation

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

docker.io/idconstruct/mcp-exec:v0.5.4

ocidocker

docker.io/idconstruct/mcp-exec:v0.5.4 package definition

{
  "transport": "stdio",
  "identifier": "docker.io/idconstruct/mcp-exec:v0.5.4",
  "runtimeHint": "docker",
  "registryType": "oci",
  "runtimeArguments": [
    {
      "name": "--network",
      "type": "named",
      "value": "none",
      "description": "No network for the sandbox (stdio posture)."
    },
    {
      "name": "--read-only",
      "type": "named",
      "description": "Read-only root filesystem."
    },
    {
      "name": "--cap-drop",
      "type": "named",
      "value": "ALL",
      "description": "Drop all Linux capabilities."
    },
    {
      "name": "--security-opt",
      "type": "named",
      "value": "no-new-privileges",
      "description": "Block privilege escalation."
    },
    {
      "name": "--user",
      "type": "named",
      "value": "65532:65532",
      "description": "Run as the non-root sandbox user."
    },
    {
      "name": "--tmpfs",
      "type": "named",
      "value": "/tmp:rw,noexec,nosuid,size=64m",
      "description": "Writable ephemeral workspace (rootfs is read-only)."
    },
    {
      "name": "--memory",
      "type": "named",
      "value": "256m",
      "description": "Memory limit."
    },
    {
      "name": "--pids-limit",
      "type": "named",
      "value": "128",
      "description": "PID limit."
    },
    {
      "name": "--cpus",
      "type": "named",
      "value": "1",
      "description": "CPU limit."
    }
  ],
  "environmentVariables": [
    {
      "name": "MCP_EXEC_TRANSPORT",
      "default": "stdio",
      "description": "MCP transport. Must be 'stdio' for direct docker/stdio use."
    },
    {
      "name": "MCP_EXEC_DEFAULT_TIMEOUT_S",
      "default": "30",
      "description": "Default wall-clock timeout per exec, seconds."
    },
    {
      "name": "MCP_EXEC_MAX_TIMEOUT_S",
      "default": "300",
      "description": "Maximum wall-clock timeout a caller may request, seconds."
    },
    {
      "name": "MCP_EXEC_MAX_OUTPUT_BYTES",
      "default": "1048576",
      "description": "Cap on combined stdout/stderr before truncation."
    },
    {
      "name": "MCP_EXEC_MAX_STDIN_BYTES",
      "default": "1048576",
      "description": "Cap on stdin passed to the sandboxed code."
    },
    {
      "name": "MCP_EXEC_AUTH_TOKEN",
      "description": "Optional X-MCP-AUTH token (http/sse transports only)."
    }
  ]
}

Tools

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

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 2, 2026, 5:14 PM UTC · repository · passed · metadata changed · updated
Nov 2, 2026, 5:14 PM UTC · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

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

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Cursor

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

Cursor configuration

{
  "mcpServers": {
    "mcp-exec-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MCP_EXEC_TRANSPORT=<YOUR_MCP_EXEC_TRANSPORT>",
        "-e",
        "MCP_EXEC_DEFAULT_TIMEOUT_S=<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_TIMEOUT_S=<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_OUTPUT_BYTES=<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "-e",
        "MCP_EXEC_MAX_STDIN_BYTES=<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "-e",
        "MCP_EXEC_AUTH_TOKEN=<YOUR_MCP_EXEC_AUTH_TOKEN>",
        "docker.io/idconstruct/mcp-exec:v0.5.4"
      ],
      "env": {
        "MCP_EXEC_TRANSPORT": "<YOUR_MCP_EXEC_TRANSPORT>",
        "MCP_EXEC_DEFAULT_TIMEOUT_S": "<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "MCP_EXEC_MAX_TIMEOUT_S": "<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "MCP_EXEC_MAX_OUTPUT_BYTES": "<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "MCP_EXEC_MAX_STDIN_BYTES": "<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "MCP_EXEC_AUTH_TOKEN": "<YOUR_MCP_EXEC_AUTH_TOKEN>"
      }
    }
  }
}

Cline

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

Cline configuration

{
  "mcpServers": {
    "mcp-exec-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MCP_EXEC_TRANSPORT=<YOUR_MCP_EXEC_TRANSPORT>",
        "-e",
        "MCP_EXEC_DEFAULT_TIMEOUT_S=<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_TIMEOUT_S=<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_OUTPUT_BYTES=<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "-e",
        "MCP_EXEC_MAX_STDIN_BYTES=<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "-e",
        "MCP_EXEC_AUTH_TOKEN=<YOUR_MCP_EXEC_AUTH_TOKEN>",
        "docker.io/idconstruct/mcp-exec:v0.5.4"
      ],
      "env": {
        "MCP_EXEC_TRANSPORT": "<YOUR_MCP_EXEC_TRANSPORT>",
        "MCP_EXEC_DEFAULT_TIMEOUT_S": "<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "MCP_EXEC_MAX_TIMEOUT_S": "<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "MCP_EXEC_MAX_OUTPUT_BYTES": "<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "MCP_EXEC_MAX_STDIN_BYTES": "<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "MCP_EXEC_AUTH_TOKEN": "<YOUR_MCP_EXEC_AUTH_TOKEN>"
      }
    }
  }
}

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": {
    "mcp-exec-mcp": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MCP_EXEC_TRANSPORT=<YOUR_MCP_EXEC_TRANSPORT>",
        "-e",
        "MCP_EXEC_DEFAULT_TIMEOUT_S=<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_TIMEOUT_S=<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_OUTPUT_BYTES=<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "-e",
        "MCP_EXEC_MAX_STDIN_BYTES=<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "-e",
        "MCP_EXEC_AUTH_TOKEN=<YOUR_MCP_EXEC_AUTH_TOKEN>",
        "docker.io/idconstruct/mcp-exec:v0.5.4"
      ],
      "env": {
        "MCP_EXEC_TRANSPORT": "<YOUR_MCP_EXEC_TRANSPORT>",
        "MCP_EXEC_DEFAULT_TIMEOUT_S": "<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "MCP_EXEC_MAX_TIMEOUT_S": "<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "MCP_EXEC_MAX_OUTPUT_BYTES": "<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "MCP_EXEC_MAX_STDIN_BYTES": "<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "MCP_EXEC_AUTH_TOKEN": "<YOUR_MCP_EXEC_AUTH_TOKEN>"
      }
    }
  }
}

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": {
    "mcp-exec-mcp": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MCP_EXEC_TRANSPORT=<YOUR_MCP_EXEC_TRANSPORT>",
        "-e",
        "MCP_EXEC_DEFAULT_TIMEOUT_S=<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_TIMEOUT_S=<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "-e",
        "MCP_EXEC_MAX_OUTPUT_BYTES=<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "-e",
        "MCP_EXEC_MAX_STDIN_BYTES=<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "-e",
        "MCP_EXEC_AUTH_TOKEN=<YOUR_MCP_EXEC_AUTH_TOKEN>",
        "docker.io/idconstruct/mcp-exec:v0.5.4"
      ],
      "env": {
        "MCP_EXEC_TRANSPORT": "<YOUR_MCP_EXEC_TRANSPORT>",
        "MCP_EXEC_DEFAULT_TIMEOUT_S": "<YOUR_MCP_EXEC_DEFAULT_TIMEOUT_S>",
        "MCP_EXEC_MAX_TIMEOUT_S": "<YOUR_MCP_EXEC_MAX_TIMEOUT_S>",
        "MCP_EXEC_MAX_OUTPUT_BYTES": "<YOUR_MCP_EXEC_MAX_OUTPUT_BYTES>",
        "MCP_EXEC_MAX_STDIN_BYTES": "<YOUR_MCP_EXEC_MAX_STDIN_BYTES>",
        "MCP_EXEC_AUTH_TOKEN": "<YOUR_MCP_EXEC_AUTH_TOKEN>"
      }
    }
  }
}

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