Agent-to-Secure Payload Authorization
A2SPA is the runtime authorization layer for autonomous agents. Every consequential action must be signed, fresh, policy-allowed, and recorded before A2SPA delivery or caller-side continuation proceeds.
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See the execution-authority gap.
This short walkthrough shows why authentication alone is not enough when autonomous agents can trigger consequential downstream actions.
AI stacks still have a payload trust gap.
Orchestration layers, tool schemas, sandboxing, IAM, guardrails, and logging often assume an incoming agent payload is legitimate once it reaches the application.
A2SPA adds a deterministic checkpoint at the execution boundary so the system can prove who authorized the exact action, what was signed, whether it is still fresh, and whether policy allows it now.
Built for real runtime enforcement.
Signed Payloads
Canonical payload hashing and detached signatures bind the sender, target, timestamp, nonce, input, output, and signature profile.
Agent Permissions
Per-agent send/receive permissions and enable/disable controls keep runtime access explicit.
Nonce Replay Protection
One-time nonce storage with TTL prevents old payloads from being replayed into new execution.
Policy Checks
Agent policies can restrict actions, intents, workflow scopes, currencies, spend amounts, targets, senders, and delegation.
Authority Continuity
Consequential workflows can bind authority to trusted state and hold execution when current standing cannot be established.
Receipts And Logs
Accepted actions produce evidence and appear in dashboard logs with CSV export and payload details.
A control layer before consequential continuation.
A2SPA does not replace identity, governance, or guardrails. It gives them a final enforcement point before irreversible action.
Authority-continuity verification
A valid request is necessary, but not always sufficient. For protected workflows, A2SPA can verify whether the authority behind an action still stands under current trusted state.
Payment Example
Agent A initiates a $100 transfer. Before Agent B settles or forwards the next step, A2SPA can check whether the trusted authorization state still supports that exact transaction.
Fail-Closed Continuation
If standing is established, the workflow may continue. If standing is unresolved or invalid, A2SPA creates a signed receipt and blocks downstream delivery.
A2SPA 1.0 asks: is this execution request valid? A2SPA 2.0 adds: does the supporting authority still stand?
The trust layer belongs before consequence.
A2SPA operates as the protocol trust layer for autonomous actions, where signed runtime authorization becomes mandatory.
How A2SPA compares
This compares publicly documented default behavior, not custom controls a team could build separately. Third-party capabilities can vary by version and implementation.
| Security Feature | A2SPA | MCP | A2A | ACP | ANP | LangChain | AWS Bedrock |
|---|---|---|---|---|---|---|---|
| Payload Signing | Yes | Not native | Not native | Not native | Not native | Varies | Varies |
| Nonce/Replay Protection | Yes | Not native | Not native | Not native | Not native | Varies | Varies |
| Permission Mapping | Yes | Varies | Varies | Varies | Partial | Partial | Varies |
| Audit Logging | Yes | Varies | Varies | Varies | Varies | Varies | Varies |
| State Continuity | Yes | Not native | Not native | Not native | Not native | Not native | Not native |
| Execution Receipts | Yes | Not native | Not native | Not native | Not native | Not native | Not native |
Why execution authorization matters.
Why is execution the real control point?
Once agents can move money, call APIs, modify infrastructure, trigger workflows, or execute autonomous actions, the irreversible moment matters more than the reasoning layer.
Are identity and governance enough?
No. Identity tells you who is involved. Governance tells you what should be allowed. A2SPA checks whether this exact action is authorized to execute right now.
Does A2SPA replace policy engines?
No. It complements them by making policy facts part of the signed payload and enforcing them before A2SPA authorizes continuation.
What happens if verification fails?
The action fails closed before downstream delivery or execution.
Build agents behind a real execution gate.
Use the dashboard for agent creation and the integration pack to let AI coding assistants wire A2SPA into existing repositories.