Sigil

Part of TunnelMind — the intelligence layer agents call before they trust the internet. Three lenses on one signed corpus: Scry (who is attacking?) · Sigil (who can you trust?) · Tracker Data API (who is watching?). This repo serves: Sigil — the MCP-tool surface agents call to verify ad-tech supply paths. See tunnelmind.ai.

MCP server for Sigil — TunnelMind's agentic supply-chain verification layer for programmatic advertising (P35).

Sigil ships as a separate MCP surface (P35 Shape B). One Cloudflare Worker, two hosts:

Host	Serves
mcp.sigil.tunnelmind.ai/mcp	Streamable-HTTP MCP endpoint (JSON-RPC 2.0)
sigil.tunnelmind.ai/.well-known/mcp.json	Discovery card (mcp-server-card/1.0-draft)

The Worker is a thin agent-facing wrapper: every tool proxies the live Sigil API at data.tunnelmind.ai/v1/sigil/* over a Cloudflare service binding. The Authorization header on an MCP request is forwarded — a paid TunnelMind key gets its tier, anonymous callers get the free tier. Discovery is unauthenticated.

Tools

Tool	Purpose
cross_lens_verify	A2 — fused Scry × Sigil verdict on one node key (IP / domain / entity / ASN). The moat: both lenses, one answer.
sigil_verify_supply_path	Composite pre-bid trust verdict + signed token
sigil_verify_ads_txt	ads.txt seller-authorization check
sigil_verify_ip_type	Datacenter / residential / mobile IP classification
sigil_verify_app_bundle	App-store bundle-ID verification
sigil_verify_supply_chain	Full OpenRTB SupplyChain (schain) verification
sigil_score_entity	Pre-computed entity trust score + 14-day trend
sigil_score_batch	Trust scores for up to 200 entities
sigil_atap_register_ait	Register an ATAP AIT for a media-buyer agent
sigil_atap_witness	Witness a bid/budget event into the attestation chain
sigil_generate_receipt	Generate the ATAP compliance Receipt ZIP

Published in the official MCP registry as ai.tunnelmind/sigil.

MCP methods: initialize, tools/list, tools/call, ping.

Develop

npm install      # wrangler
npm test         # tool-definition checks
npm run dev      # local
npm run deploy   # -> Cloudflare

License

Apache-2.0.