sigil-mcp
Sigil is an MCP server for verifying programmatic advertising supply paths, providing tools for trust verification, entity scoring, and ATAP compliance.
README
sigil-mcp
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
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