A vibe code MCP Interactsh Bridge

This project exposes ProjectDiscovery's interactsh as a Model Context Protocol server implemented in Node.js. It lets MCP-compatible IDEs or agents provision interactsh sessions, poll for out-of-band interactions, and tear them down without modifying the upstream interactsh codebase.

Features

Session provisioning – Generates RSA key pairs, registers with the public interactsh fleet, and returns ready-to-use callback domains.
Polling & decryption – Retrieves encrypted interaction data and decrypts it locally using the session's private key.
Lifecycle management – Lists cached sessions and deregisters them when finished.
Demo script – npm run demo spins up a session, issues a real HTTP probe, and prints the captured DNS/HTTP events.

Requirements

Node.js 18 or newer (tested on Node 20.19)
Network access to the interactsh fleet (defaults to https://oast.pro)

Installation (local)

git clone https://github.com/tachote/mcp-interactsh cd mcp-interactsh npm install

Run via npx

npx -y mcp-interactsh

You can also pass environment variables inline:

INTERACTSH_BASE_URL=https://oast.pro \ INTERACTSH_DOMAIN_SUFFIX=oast.pro \ npx -y mcp-interactsh

Usage

Run the MCP server

The MCP server communicates over stdio. Configure your MCP-compatible client (e.g. Claude Code, VS Code MCP, Cursor) to launch:

node src/server.js

Optional environment variables:

Variable	Default	Description
`INTERACTSH_BASE_URL`	`https://oast.pro`	Base URL of the interactsh server to target.
`INTERACTSH_DOMAIN_SUFFIX`	host derived from `INTERACTSH_BASE_URL`	Domain suffix used to build callback hosts. Override when using a custom interactsh deployment.
`INTERACTSH_TOKEN`	(unset)	Authorization token if your interactsh server enforces auth.

Available MCP tools

create_interactsh_session – Registers a new session and returns correlation ID, secret key, PEM private key, callback domain, server URL, plus explicit probe instructions.
- Probing rules:
  - Build host as <correlation_id><nonce13>.<domain>.
  - correlation_id is exactly 20 lowercase hex chars; do not alter or truncate.
  - nonce13 is exactly 13 lowercase alphanumeric chars [a-z0-9].
  - The label before the first dot must be 33 chars total (20 + 13).
  - Requests to <correlation_id>.<domain> (no nonce) are ignored by interactsh.
  - Prefer plain HTTP for probes. Wait 2–3 seconds, then poll for events.
list_interactsh_sessions – Lists all sessions cached in memory for the current MCP process.
poll_interactsh_session – Polls interactsh for new interactions, returning decrypted events. Optional arguments let you filter by method, path_contains, query_contains, protocol, or text_contains to focus on specific callbacks.
deregister_interactsh_session – Deregisters the session and removes it from local state.

Configure in Claude Code (JSON)

Claude Code supports MCP servers over stdio. If you prefer to configure via JSON, add an entry like the following in your Claude Code settings (Settings → MCP Servers or the equivalent config file):

{ "mcpServers": { "interactsh": { "transport": "stdio", "command": "npx", "args": ["-y", "mcp-interactsh"], "env": { "INTERACTSH_BASE_URL": "https://oast.pro", "INTERACTSH_DOMAIN_SUFFIX": "oast.pro" // "INTERACTSH_TOKEN": "your_server_token_if_required" } } } }

If you prefer to use a local path (without npx), use:

{ "mcpServers": { "interactsh": { "transport": "stdio", "command": "node", "args": ["/absolute/path/to/src/server.js"], "env": { "INTERACTSH_BASE_URL": "https://oast.pro", "INTERACTSH_DOMAIN_SUFFIX": "oast.pro" } } } }

Or you can add it with:

claude mcp add --transport stdio interactsh \ -e INTERACTSH_BASE_URL=https://oast.pro \ -e INTERACTSH_DOMAIN_SUFFIX=oast.pro \ -- npx -y mcp-interactsh

Configure in Codex (TOML)

Codex reads MCP server configuration from ~/.codex/config.toml. Add an entry like the following:

[mcp_servers.interactsh] command = "npx" args = ["-y", "mcp-interactsh"] env = { INTERACTSH_BASE_URL = "https://oast.pro", INTERACTSH_DOMAIN_SUFFIX = "oast.pro" }

If you prefer to reference a local clone instead of npx:

[mcp_servers.interactsh] command = "node" args = ["/absolute/path/to/src/server.js"] env = { INTERACTSH_BASE_URL = "https://oast.pro", INTERACTSH_DOMAIN_SUFFIX = "oast.pro" }

Or you can add it with:

codex mcp add --env INTERACTSH_BASE_URL=https://oast.pro --env INTERACTSH_DOMAIN_SUFFIX=oast.pro interactsh -- npx -y mcp-interactsh

You can verify the configuration with:

codex mcp list codex mcp get interactsh --json