interactsh-mcp

An MCP server that gives LLMs first-class access to ProjectDiscovery's Interactsh — the out-of-band (OOB) interaction collector behind tools like Nuclei.

Use it to let an agent validate OOB-style vulnerabilities end-to-end: blind SSRF, log4shell-style JNDI callbacks, blind XXE, blind SQLi exfil, DNS exfiltration, command-injection callbacks, blind XSS, etc. The agent gets a fresh payload URL, embeds it in a request to the target, and polls for the callback to confirm the bug.

Works against the public Interactsh service (the public oast.* rotation) out of the box, and against any self-hosted server — with or without a token.

The package ships two things in one install:

1. An MCP server binary (interactsh-mcp) for Claude Code, Codex CLI, etc.
2. An async Python library (interactsh_mcp) you can import directly if you'd rather drive Interactsh from your own code — see Use as a Python library below.

Install

From PyPI (recommended)

pip install interactsh-mcp
# or, with uv:
uv tool install interactsh-mcp

After install the interactsh-mcp command starts the MCP server on stdio.

From GitHub (latest, no PyPI release needed)

pip install git+https://github.com/rek7/interactsh-mcp.git
# or, run without installing:
uvx --from git+https://github.com/rek7/interactsh-mcp.git interactsh-mcp

From source

git clone https://github.com/rek7/interactsh-mcp.git
cd interactsh-mcp
pip install .

Docker

# Build locally
docker build -t interactsh-mcp .
docker run --rm -i interactsh-mcp     # smoke test; Ctrl-D to exit

The image runs as a non-root user and only needs outbound HTTPS to the Interactsh server.

Configure your client

Claude Code

Claude Code reads MCP servers from ~/.claude.json (or a project-local .mcp.json). Add an entry under "mcpServers":

Local Python install — public servers

{
  "mcpServers": {
    "interactsh": {
      "command": "interactsh-mcp"
    }
  }
}

Local Python install — self-hosted server

{
  "mcpServers": {
    "interactsh": {
      "command": "interactsh-mcp",
      "env": {
        "INTERACTSH_SERVER": "interact.example.com",
        "INTERACTSH_TOKEN": "your-server-token"
      }
    }
  }
}

Omit INTERACTSH_TOKEN if your self-hosted server was started without -auth.

Docker

{
  "mcpServers": {
    "interactsh": {
      "command": "docker",
      "args": [
        "run", "--rm", "-i",
        "-e", "INTERACTSH_SERVER",
        "-e", "INTERACTSH_TOKEN",
        "interactsh-mcp"
      ],
      "env": {
        "INTERACTSH_SERVER": "interact.example.com",
        "INTERACTSH_TOKEN": "your-server-token"
      }
    }
  }
}

You can also register the server with the CLI:

claude mcp add interactsh -- interactsh-mcp
# with env vars:
claude mcp add interactsh \
  -e INTERACTSH_SERVER=interact.example.com \
  -e INTERACTSH_TOKEN=your-server-token \
  -- interactsh-mcp

Codex CLI

Codex CLI (OpenAI's terminal coding agent) reads MCP servers from ~/.codex/config.toml:

Public servers

[mcp_servers.interactsh]
command = "interactsh-mcp"

Self-hosted with token

[mcp_servers.interactsh]
command = "interactsh-mcp"
env = { INTERACTSH_SERVER = "interact.example.com", INTERACTSH_TOKEN = "your-server-token" }

Docker

[mcp_servers.interactsh]
command = "docker"
args = ["run", "--rm", "-i", "-e", "INTERACTSH_SERVER", "-e", "INTERACTSH_TOKEN", "interactsh-mcp"]
env = { INTERACTSH_SERVER = "interact.example.com", INTERACTSH_TOKEN = "your-server-token" }

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows. Same shape as the Claude Code example above.

Environment variables

Tools the LLM sees

Typical agent workflow

1. Agent calls create_session → gets payload_url e.g. c7lci09s8mts0o3og0g0abc12.oast.pro.
2. Agent crafts an exploit that uses payload_url — a JNDI string in a User-Agent header, a ?url=http://payload_url/ SSRF, a DNS subdomain in a SQL payload, etc.
3. Agent sends the request to the target.
4. Agent calls poll_interactions(session_id, wait=10) and, if interactions come back, reports the vuln as confirmed (with the source IP / raw request from the callback as evidence).
5. Agent calls destroy_session when done.

For multiple test variants in one conversation the agent can either call create_session per variant or call new_payload to get distinct URLs that share a session.

Use as a Python library

The package exports an async client you can import directly — no MCP, no LLM, just interactsh_mcp:

import asyncio
from interactsh_mcp import InteractshClient

async def main():
    # No args → random public oast.* server. Pass server=/token= to target a
    # self-hosted instance (token only needed if it was started with -auth).
    async with InteractshClient() as client:
        payload_url = client.generate_payload()
        print(f"send something to: {payload_url}")

        # ... fire your exploit / trigger the target with that URL ...

        for event in await client.poll():
            print(f"{event.protocol} from {event.remote_address}")

asyncio.run(main())

For longer-lived setups (multiple payloads, background polling, buffered events), use the session manager:

from interactsh_mcp import SessionManager

mgr = SessionManager()
session = await mgr.create(poll_interval=2.0)

url_a = mgr.new_payload(session)   # different nonce, same correlation-id
url_b = mgr.new_payload(session)
# ... trigger both ...

events = await session.drain(wait=15)   # blocks until first event or timeout
await mgr.aclose()

Exports at the package root:

The package ships type stubs (py.typed), so mypy / pyright pick the types up automatically. If you need to call from sync code, wrap with asyncio.run(...) — see examples/04_sync_wrapper.py.

More runnable examples: examples/.

Self-hosting Interactsh

Quick reminder of how to stand up a server you can point this MCP at:

# Public, no auth:
interactsh-server -domain interact.example.com

# Token-protected (server prints a random token; pass it as INTERACTSH_TOKEN):
interactsh-server -domain interact.example.com -auth

See the interactsh server docs for DNS, TLS, and infra setup.

Development

git clone https://github.com/rek7/interactsh-mcp.git
cd interactsh-mcp
python -m venv .venv && source .venv/bin/activate
pip install -e '.[test]'
pytest

Live integration tests (DNS-callback against a real server) are opt-in:

INTERACTSH_LIVE=1 pytest tests/test_live.py
# or against a self-hosted server:
INTERACTSH_LIVE=1 INTERACTSH_SERVER=interact.example.com INTERACTSH_TOKEN=... pytest tests/test_live.py

The mocked test suite exercises the full register → poll → decrypt → drain path against an in-process fake server, so the crypto and HTTP wiring are covered without network access.

License

MIT. Interactsh itself is MIT-licensed and developed by ProjectDiscovery.