Multi-Agent Email Flow

Multi-agent delegation with failure handling, cascade revocation, and audit trail.

What it does

This example demonstrates a realistic two-agent email automation workflow with comprehensive failure handling:

1. Register two agents — a planner (Agent A) and an executor (Agent B)
2. Agent A reads calendar events after offline scope verification
3. Agent A delegates email:send to Agent B (subset of its own scopes)
4. Agent B sends an email using the delegated, scoped permission
5. Failure: unauthorized scope — Agent B tries calendar:read (not delegated) and is rejected immediately
6. Failure: cascade revocation — Agent A’s grant is revoked, which automatically invalidates Agent B’s delegated token
7. Recovery pattern — Agent B detects the revoked token and reports that a new delegation is needed
8. Audit trail inspection — shows a timeline of all success and failure events across both agents

Prerequisites

• Node.js 18+
• Docker (Docker Desktop or Docker Engine with Compose)

Run

Start the local Grantex stack from the repository root:

docker compose up --build

In a separate terminal, run the example:

cd examples/multi-agent-email-flow
npm install
npm start

Expected output

=== Multi-Agent Email Flow ===

Agent A (planner) registered: ag_01HXYZ...
Agent B (executor) registered: ag_01HXYZ...

Agent A grant token:
  grantId: grnt_01HXYZ...
  scopes:  calendar:read, email:send

--- Agent A: Reading calendar ---
Scope verified offline: calendar:read
Calendar events found: 3

--- Agent A: Delegating email:send to Agent B ---
Delegated token issued:
  scopes:  email:send
  delegationDepth: 1

--- Agent B: Sending email ---
Email sent: msg_1234567890

--- Failure: Agent B tries calendar:read (not delegated) ---
Blocked! Agent B cannot read calendar.

--- Failure: Revoking Agent A's grant (cascade to Agent B) ---
After revocation:
  Agent A token valid: false (revoked)
  Agent B token valid: false (cascade revoked)

--- Audit trail ---
  [+] Agent A calendar:read — success
  [+] Agent B email:send — success
  [x] Agent B calendar:read — failure
  [x] Agent B email:send — failure

Done! Multi-agent email flow with failure handling complete.

Environment variables

Variable	Default	Description
GRANTEX_URL	http://localhost:3001	Base URL of the Grantex auth service
GRANTEX_API_KEY	sandbox-api-key-local	API key. Use a sandbox key for auto-approval

Source code

The full source is in examples/multi-agent-email-flow/src/index.ts.