MCP server

Nullcone Threat Intelligence

io.github.maco144/nullcone

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Real-time threat intel for AI agents: 890K+ IOCs incl. prompt-injection & AI-skill threats

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

30

Token cost

About 7,533 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http nullcone https://nullcone.ai/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.nullcone]
url = "https://nullcone.ai/mcp"

Gemini CLI

{"mcpServers":{"nullcone":{"httpUrl":"https://nullcone.ai/mcp"}}}

Cursor

{"mcpServers":{"nullcone":{"url":"https://nullcone.ai/mcp"}}}

VS Code

{"servers":{"nullcone":{"type":"http","url":"https://nullcone.ai/mcp"}}}

Antigravity

agy mcp add nullcone https://nullcone.ai/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"nullcone","server_url":"https://nullcone.ai/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"nullcone","server_url":"https://nullcone.ai/mcp"}

Tools

• check_freshness ~449 tokens
  Validate that IOC threat intelligence is fresh enough for the named action. Call this before any high-risk agent action to ensure the TI snapshot is not stale. The check itself completes in <1ms (no network I/O). Action → staleness tier mapping: critical (≤30s): credential_
• check_prompt ~405 tokens
  Check a prompt or text fragment for known PROMPT IOC patterns. Uses an in-memory hash set for sub-1ms token-level querying — no network calls after the cache is warmed. Slides a window of 3, 5, 8, and 10 tokens across the input and checks each window's canonical SHA256 against
• check_prompt_batch ~163 tokens
  Check multiple prompts for PROMPT IOC patterns in a single call. More efficient than calling check_prompt() in a loop — tokenization overhead is amortized and the cache reference is shared. Args: texts: List of prompt strings to check Returns: One result dict
• drain_subscription ~290 tokens
  Drain the buffer of a stateful subscription created by subscribe_threats(). Returns all IOCs delivered to this subscription since the last drain. Each subscription is independent — draining yours does not affect others. Args: subscription_id: The ID returned by subscribe_t
• family_threats ~167 tokens
  Return all threat signatures associated with a known malware family. Use list_families() first to discover available family names. Args: family_name: Exact malware family name (e.g. "emotet", "qbot", "cobalt_strike") limit: Max results to return (1-500). Default
• fingerprint_tool_metadata ~598 tokens
  Analyze an MCP tool definition for instruction-injection and malicious patterns. Performs semantic fingerprinting of the tool's description, parameter schemas, and error templates — detecting credential exfiltration vectors, C2 callbacks, base64 payloads, authority spoofing, and in
• freshness_limits ~103 tokens
  Return the configured IOC freshness limits for all action tiers. Shows max staleness, warn threshold, and which actions belong to each tier. Use this to understand when check_freshness() will warn or block.
• get_new_threats ~294 tokens
  Drain the live push-subscription buffer of threats received since the last call. Zero-polling — threats are delivered via SpacetimeDB WebSocket subscription and buffered server-side. Use this instead of poll_since() when you need sub-second latency without maintaining your own
• get_stats ~86 tokens
  Return aggregate statistics for the threat intelligence database. Includes total signatures, known malware families, active agents, and total detection events.
• is_ioc_revoked ~169 tokens
  Check whether an IOC has been revoked. O(1) in-process lookup. Use this before acting on any cached threat intelligence to ensure the IOC has not been retracted since it was loaded. Args: value_hash: SHA256 of {ioc_type}:{value.lower()}. Returns: revoked: bool
• list_families ~100 tokens
  Return all known malware families in the intelligence database. Each entry includes the family name, description, and category. Use family_threats(family_name) to retrieve the IOCs for a specific family.
• list_revocations ~201 tokens
  List recent IOC revocations, newest first. Args: limit: Maximum number of revocations to return (default 50). since_hours: Only return revocations newer than this many hours ago. 0 = no time filter (return all retained). Returns: revo
• list_subscriptions ~117 tokens
  List all active stateful push subscriptions on this MCP server instance. Returns metadata for each subscription (not the buffered IOCs themselves). Useful for inspecting what agents are currently subscribed and what filters they have configured.
• lookup_ioc ~132 tokens
  Look up a threat signature by its exact IOC value. Returns the full signature record if found, including severity, family, detection count, and false positive votes. Args: value: The exact IOC value to search for (e.g. "evil.example.com")
• poll_since ~275 tokens
  Fetch new threat signatures since a high-water mark ID. This is the recommended sync pattern — one call, get new data, persist next_id, disconnect. No persistent connection required. Call with last_id=0 on first run to get all signatures. Persist the returned next_id and pass i
• prompt_cache_stats ~98 tokens
  Return PROMPT IOC cache statistics: size, hit rate, latency, refresh status. Use this to verify the cache is warmed and healthy before relying on check_prompt() for real-time detection.
• recent_threats ~133 tokens
  Return the most recently observed threat signatures. Args: limit: Max number of results to return (1-200) min_severity: Minimum severity level (0-10). Default 5 (medium+)
• registry_flagged_tools ~104 tokens
  Return all MCP tools that have been flagged as suspicious or malicious. Includes tools flagged on initial ingestion (high-risk fingerprint) and tools that showed significant semantic drift on update.
• registry_monitor_stats ~91 tokens
  Return MCP registry monitoring statistics. Shows how many tool definitions are tracked, how many have been flagged, and the current drift detection rate.
• report_detection ~244 tokens
  Report that you detected and acted on a known threat signature. Increments the signature's detection count and creates a ThreatEvent visible to all other agents in real-time. Args: signature_id: ID of the ThreatSignature (from submit_ioc or lookup_ioc) action:
• revoke_ioc Changes accounts · ~341 tokens
  Revoke an IOC by its value hash, pushing the expiration event to all active subscriptions in real-time. Call this when an IOC is determined to be a false positive, expired, or superseded. Subscribed agents receive the revocation event on their next drain_subscription() call wit
• scan_skill_content ~545 tokens
  Pre-execution content scan for skill/instruction files. Analyzes the full text of a skill (markdown, plain text, SKILL.md, etc.) for malicious patterns BEFORE the agent follows the instructions. This is the critical defense against remote skill-mediated credential exfiltration
• search_by_type ~240 tokens
  Return threat signatures filtered by IOC type. Useful for pulling all known-bad IPs, all malicious domains, all malicious AI skill hashes, etc. Args: ioc_type: One of: hash_md5, hash_sha1, hash_sha256, ip, ip_port, domain, url, yara, email, mutex,
• submit_batch ~216 tokens
  Submit multiple IOCs in a single call. Preferred over looping submit_ioc for bulk ingest from honeypots, sandboxes, or feed processing. Each dict in `iocs` follows the same schema as submit_ioc parameters. Required keys: ioc_type, value. All others are optional. Returns one re
• submit_ioc ~486 tokens
  Submit a threat indicator (IOC) to the shared intelligence network. The IOC is automatically classified into a malware family, metadata is compressed, and deduplication is handled atomically. All subscribed agents see the new IOC instantly. Args: ioc_type: IOC categ
• subscribe_threats ~598 tokens
  Open a named, stateful subscription to live threat push delivery. Returns a subscription_id. Pass it to drain_subscription() to collect the IOCs that have arrived since your last drain — zero polling, each caller gets their own isolated stream. Multiple subscribers receive ind
• unsubscribe ~187 tokens
  Cancel a stateful subscription and free its buffer. Call this when you no longer need the subscription to release memory. Subscriptions also auto-expire after 1 hour of inactivity. Args: subscription_id: The ID returned by subscribe_threats() Returns: status:
• validate_skill ~344 tokens
  Synchronous SKILL IOC lookup — call this before loading or invoking any MCP tool/skill to check it against the Nullcone threat feed. This is the pre-invocation enforcement hook. Returns an allow/warn/block decision based on whether the skill hash is a known-malicious indicator.
• vote_false_positive ~177 tokens
  Flag a threat signature as a likely false positive. When more than 20% of agents vote false positive on a signature, its `is_likely_fp` flag becomes True — a signal to review before blocking. Args: signature_id: ID of the ThreatSignature to flag reason: Optio
• warm_prompt_cache ~180 tokens
  Load all PROMPT IOCs from SpacetimeDB into the in-memory hash set. Call once at startup (or after a major feed update) to populate the sub-1ms query cache. Subsequent check_prompt() calls require no network access. The cache auto-refreshes every 5 minutes in the background. Re

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