AIP Gateway

Drop-in policy proxy that adds verifiable delegation to MCP and A2A without rewriting your agents.

Before:  Agent --> MCP Server
After:   Agent --> AIP Gateway --> MCP Server

Quick Start

pip install aip-gateway
aip-gateway serve --policy policy.yaml

Or with Docker:

docker run -v ./policy.yaml:/etc/aip-gateway/policy.yaml -p 8090:8090 sunilp/aip-gateway

What It Does

The gateway sits between your agents and MCP servers. Every request is verified:

1. Token verification -- Ed25519 signature check against trusted keys
2. Policy evaluation -- agent scope, delegation depth, budget limits, workflow rules
3. Header injection -- upstream gets verified caller identity (no SDK needed)
4. Audit logging -- every allow/deny decision in JSONL

Policy File

gateway:
  upstream: http://localhost:8080
  port: 8090

trust_keys:
  - z6MkYourTrustKeyHere...

agents:
  credit-scorer:
    identity: "aip:key:ed25519:zScorer..."
    can_delegate:
      - tool:check_credit
    max_depth: 0

rules:
  - action: tool:approve_loan
    requires:
      - tool:check_credit
      - tool:assess_risk
    deny_if:
      - same_actor: [credit-scorer, loan-approver]

Demo: Loan Origination

cd examples/loan_origination
python run_demo.py

Four scenarios showing scope enforcement, prerequisite checking, and maker-checker separation:

Scenario 1: Valid chain          -> ALLOW (proper segregation of duties)
Scenario 2: Scope violation      -> DENY  (scorer cannot approve loans)
Scenario 3: Missing prerequisite -> DENY  (no approval without due diligence)
Scenario 4: Same-actor           -> DENY  (maker-checker separation enforced)

AIP prevents an AI agent from turning credit scoring authority into loan approval authority.

Upstream Header Enrichment

After verification, the gateway injects identity headers into forwarded requests:

X-AIP-Verified: true
X-AIP-Issuer: aip:key:ed25519:zOrchestrator...
X-AIP-Subject: aip:key:ed25519:zScorer...
X-AIP-Scope: tool:check_credit
X-AIP-Depth: 1

Your MCP server reads these without any AIP SDK dependency.

CLI

aip-gateway serve --policy policy.yaml     # Start the proxy
aip-gateway validate --policy policy.yaml  # Check policy syntax
aip-gateway version                        # Show version

Protocol

• Paper: arXiv:2603.24775
• IETF: draft-prakash-aip-00
• Spec: sunilprakash.com/aip/
• TypeScript SDK: @aip-sdk on npm
• Python SDK: agent-identity-protocol on PyPI

License

Apache 2.0