WhisperGraph is an MCP server backed by the world's largest internet-infrastructure graph database - 46 billion nodes and edges across 20 entity types, mapping every domain, IP, ASN, prefix, organization, Web link and threat-intelligence listing into a single Cypher-queryable graph. Used by security teams, incident responders, and AI agents for investigation, attribution, brand protection, and infrastructure forensics.

Built for agents from day one.

• Programmatic signup in 2 HTTP calls. No browser, no CAPTCHA, no human-in-the-loop. Email verification only. Working API key in ~5 seconds.
• Free trial for everyone, including agents. Paid tiers for higher quotas.

What you can ask:

• DNS: resolution, nameservers, MX, SPF chains, DNSSEC
• Routing: ASN ownership, BGP origin history, MOAS conflicts, peering
• Hosting & ownership: registrar, WHOIS contacts, organization mapping
• Threat intel: ~40 feeds across 18 categories, CALL explain() for full threat scoring
• Historical: WHOIS history, BGP route changes
• Web: 10.9B hyperlinks for inter-domain analysis

Learn more: Agent signup · WhisperGraph intro · Cypher API reference · Query guide · Cypher syntax · Functions · Best practices · MCP setup

Quick start

You need a WhisperGraph API key. Get one either:

• Programmatically (recommended for agents) - see Agent quickstart below.
• Via the dashboard (recommended for humans) - console.whisper.security/sign-up.

Hosted remote server (no install)

Whisper runs a hosted MCP server at https://mcp.whisper.security. Point any MCP client that supports remote servers at it and authenticate with your API key:

{
  "mcpServers": {
    "whisper": {
      "url": "https://mcp.whisper.security",
      "headers": { "Authorization": "Bearer <your_api_key>" }
    }
  }
}

MCP clients (stdio)

For local stdio transport, add this to your MCP client config:

{
  "mcpServers": {
    "whisper-graph": {
      "command": "npx",
      "args": ["-y", "@whisper-security/whisper-graph-mcp"],
      "env": { "WHISPER_API_KEY": "your-api-key" }
    }
  }
}

Self-hosting this repo is for teams who want to run the MCP layer in their own environment. See How to set up.

Agent quickstart

Get a working API key in two HTTP calls - no browser, no CAPTCHA, no waiting list.

Step 1 - start signup (Whisper emails a verification code):

POST https://console.whisper.security/api/signup
Content-Type: application/json

{"email":"[email protected]","attribution":{"agent_name":"your-agent","source":"<registry-name>"}}

Step 2 - verify with the emailed code:

POST https://console.whisper.security/api/signup/verify
Content-Type: application/json

{"signup_id":"...","code":"..."}

The response contains api_key, mcp_url, dashboard_url, and docs_url. Use api_key in the MCP config snippet above. Full docs: whisper.security/docs/agent-signup.

Tools

All eight tools are read-only.

| Tool | What it does | | ------------------- | --------------------------------------------------------------------------------------------------------------- | | query | Execute a Cypher query against WhisperGraph. Validated against a safety rule set before it reaches the backend. | | list_labels | List every node label with counts. Call it before writing a query when you're unsure which label to anchor on. | | describe_label | Confirm a label exists and enumerate its property keys. | | explain_indicator | Threat assessment for an IP, hostname, CIDR, or ASN - score, level, factors, sources. | | whisper_history | Historical WHOIS or BGP data for an indicator. | | domain_variants | Typosquatting / brand-protection variants of a domain, checked against the graph. | | list_recipes | List the full whisper.security catalog of ready-made recipes (see below). | | run_recipe | Run any catalog recipe by slug - a keyless direct procedure or a keyed multi-step flow. |

Catalog recipes

list_recipes + run_recipe expose the entire whisper.security catalog - 29 curated recipes, no hand-written Cypher required. The vendored catalog (src/catalog/recipes.json) is generated from the canonical source with npm run sync:catalog, so it tracks the platform.

Two kinds:

• Direct recipes (keyless). A single graph procedure that runs without a key (rate-limited): assess (threat posture), identify (vendor/operator), explain, variants, origins (CDN de-cloak), history / history-whois, walk, psl-tldplusone, psl-affiliation, asset, lookup-tor-relay, db-schema.
• Flow recipes (keyed). Curated multi-step investigations that need an API key: attack-path, attack-surface, indicator-enrichment, infrastructure-mapping, subdomain-takeover, bgp-hijack-exposure, blast-radius, route-health, typosquat, nameserver-hijack-dns-consistency, map-supply-chain-concentration, discover-ai-agent-infrastructure, build-takedown-evidence-package, indicator, anycast-dns-root-sovereignty.

// keyless direct recipe
{ "name": "run_recipe", "arguments": { "recipe": "assess", "inputs": { "v": "185.220.101.33" } } }

// keyed multi-step flow (needs WHISPER_API_KEY / X-API-Key)
{ "name": "run_recipe", "arguments": { "recipe": "indicator-enrichment", "inputs": { "value": "github.com" } } }

Each recipe carries a docsUrl (visible in list_recipes) linking to its page under whisper.security/docs.

Resources

Six MCP resources: the full schema, the relationship map, a Cypher function reference, a query cookbook, plus live whisper://stats and whisper://quota.

Prompts

Eight investigation-workflow prompt templates: investigate-ip, map-attack-surface, compare-domains, blast-radius, threat-triage, whois-pivot, bgp-investigation, typosquat-sweep.

Self-hosting (Docker / HTTP)

For remote or team deployments, run the server over Streamable HTTP:

docker run -p 8080:8080 -e MCP_TRANSPORT=http \
  ghcr.io/whisper-sec/whisper-graph-mcp:latest

Or with Docker Compose:

docker compose up

In HTTP mode the server does not authenticate inbound requests - it relays the caller's X-API-Key or Authorization: Bearer header to the hosted WhisperGraph API, falling back to the WHISPER_API_KEY environment variable when no header is present. Put it behind your own gateway if you need access control.

Configuration

All configuration is via environment variables.

| Variable | Default | Description | | -------------------------- | -------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | WHISPER_API_KEY | (none) | Your WhisperGraph API key. Get one programmatically in 2 HTTP calls or via the dashboard. | | MCP_TRANSPORT | stdio | stdio for local CLI use, http for remote/Docker. | | HTTP_HOST | 0.0.0.0 | Bind host for the HTTP transport. | | HTTP_PORT | 8080 | Bind port for the HTTP transport. | | WHISPER_ALLOWED_HOSTS | (none) | Comma-separated Host header allowlist for DNS-rebinding protection in HTTP mode. Leave empty only behind a trusted gateway. | | WHISPER_DB_URL | https://graph.whisper.security | Base URL of the hosted WhisperGraph API. | | WHISPER_QUERY_TIMEOUT_MS | 60000 | Hard per-query deadline forwarded to the API. | | WHISPER_DB_TIMEOUT_MS | 10000 | HTTP timeout for non-query calls. | | LOG_LEVEL | info | debug, info, warn, or error. |

Development

npm install
npm run dev       # run from source over stdio
npm test          # unit + integration tests (no secrets needed)
npm run build     # bundle to dist/
npm run lint      # eslint
npm run typecheck # tsc --noEmit

Contributing

Contributions are welcome. See CONTRIBUTING.md and our Code of Conduct. Security issues: see SECURITY.md.

License

Apache-2.0. "Whisper", the Whisper logo, and "WhisperGraph" are trademarks of Whisper Security - see NOTICE.