Agent execution ledger
AvailableAgent Outbox is an idempotency ledger for AI agents. Route every mutating tool call through one gateway that guarantees exactly-once execution, even when agents crash, retry, loop, or fork.
Problem
As agents gain the ability to send emails, process refunds, create tickets, provision infrastructure, and modify CRM records, ordinary retry logic becomes dangerous. A crash, timeout, loop, or fork can execute the same action twice, creating duplicate refunds, repeated emails, orphaned tickets, and corrupted state.
Fit
Use Agent Outbox when agents call mutating APIs and duplicate side effects are unacceptable: refunds, emails, tickets, issues, CRM records, infrastructure changes, and other production actions.
Action lifecycle
Agent Outbox is not passive logging. Control happens before the API call, then the ledger settles the record afterward.
A request starts with an agent-scoped key bound to a run, checkpoint, tool, and environment.
The ledger evaluates the idempotency key, prior receipts, and commit status before any provider sees the call.
The action is reserved atomically before the upstream API call so concurrent retries cannot execute twice.
The gateway executes the tool call with native provider behavior while preserving the execution context.
The final or estimated outcome is recorded, reconciled with the reservation, and written as a ledger entry.
Engineering sees a receipt, operations sees duplicate blocking, and compliance sees an append-only trail.
Execution model
Agent Outbox models execution as an append-only ledger instead of fire-and-forget API calls, because agent work crosses runs, retries, forks, and multiple agents.
Global tool access, domain joining, role model, and top-level idempotency posture.
A single agent execution with a unique run ID scoped to a workflow or session.
Named save points within a run where committed actions become immutable facts.
Automation keys and delegated keys for parent agents and their worker surfaces.
Every tool call gets a semantic idempotency key, receipt, and external reference.
Operational views
Feature depth
Route mutating tool calls for Stripe, SendGrid, Linear, GitHub, HubSpot, AWS, Slack, Anthropic, and MCP-connected tools through one execution gateway.
Block duplicate side effects before provider calls. Use alerts, review-required policies, action quotas, and run-based limits when execution needs stronger control.
Bind keys to organizations, runs, checkpoints, employees, agents, subagents, projects, providers, tools, expiration, environment, and per-action limits.
Turn tool calls into booked receipts with provider, tool, actor, scope, confidence, request ID, policy status, external reference, and export support.
Postgres system of record, worker rollups, audit records, metrics protection, observability hooks, and operational export paths.
Designed for customer-managed environments: private cloud or on-premises Kubernetes via Helm, external Postgres, customer-managed secrets, ingress and TLS, and offline catalog support.
Cynsta view
Agent execution becomes reliable when every action has a receipt, an owner, and a guarantee.
Audience
We can help you decide whether this product, a custom system, or a broader AI architecture engagement is the right path.