Yebo: The Checkpoint Before AI Actions ExecuteLog inStart Building

Runtime Authorization Infrastructure<br>The checkpoint beforeAI actions execute.<br>Enforce verified intent at machine speed.<br>Every sensitive AI action is evaluated against policy before execution. Deterministic, runtime-enforced, and fail-closed by design.<br>Start BuildingView Architecture<br>Policy eval<br>PostureFail-closed<br>AuditImmutable

agent.execute()verified<br>await yebo.verify({<br>action: "transfer.funds",<br>amount: 4_200_00,<br>currency: "USD",<br>destination: "acct_8a4f...",<br>agent: "ops-runner-3"<br>})DecisionALLOW<br>policy<br>payments.below_threshold

receipt<br>rcpt_a1b2c3d4

The problem

Authorization built for humanscannot govern autonomous agents.<br>AI agents now execute payments, sign contracts, and modify production infrastructure. The systems that decide whether those actions are allowed were not designed for callers that act ten thousand times an hour.

01Agents move at machine speed<br>An autonomous agent can chain a hundred actions before a human sees the first one. Approval queues that worked for humans collapse the moment they meet inference loops.

02Existing auth assumes humans<br>OAuth scopes, session tokens, role grants. All of it was designed around a person clicking a button. Hand the same credentials to an agent and the model becomes the security perimeter.

03Actions chain autonomously<br>One ambiguous instruction becomes ten downstream calls across systems you don’t own. Without a checkpoint at each call, intent drift becomes financial loss, data exposure, or silent state changes.

04Enterprises need runtime verification<br>Build-time guardrails and prompt filters can’t prove what the agent actually executed. Compliance, finance, and security teams need a deterministic gate at the moment of execution, not a log to read after.

How Yebo works

Intent, verified before execution.<br>A three-stage pipeline sits between every agent and every sensitive action. Each stage is deterministic, recorded, and impossible to bypass.

STEP 01<br>Intent<br>The agent declares what it wants to do, in structured form. Action type, parameters, target, caller identity. Every call is a signed proposal, not a side effect.<br>action: "transfer.funds",<br>amount: 4_200_00,<br>destination: "acct_8a4f"<br>STEP 02<br>Policy verification<br>Yebo evaluates the intent against your policy bundle in milliseconds. Deterministic rules, scoped permissions, threshold checks, and dependency graphs, all enforced before the runtime sees a single side effect.<br>policy: payments.transfer<br>match: amount ALLOW<br>STEP 03<br>Authorized execution<br>Only verified actions reach your runtime. Each one carries a signed receipt that proves what was approved, by which policy, against which agent identity. Replayable, auditable, and tamper-evident.<br>decision: ALLOW<br>receipt: rcpt_a1b2c3d4<br>policy: payments.below_threshold<br>verified: 2026-05-15T17:24:08Z

Runtime enforcement

Policy is not a guideline.It is a gate.<br>Yebo is the enforcement layer between agent intent and runtime execution. Every property below is checked at call time, on every action, with no exceptions and no overrides.

01<br>Deterministic verification<br>Every decision is the output of a pure policy function. Same input, same outcome, every time. No model, no stochasticity, no drift.

02<br>Runtime policy checks<br>Policies execute inline at the call site, not at deploy time. Updates propagate instantly across every agent, every fleet, every region.

03<br>Immutable audit trails<br>Each verification produces a signed receipt. Replay any decision months later with the exact policy, parameters, and identity that produced it.

04<br>Scoped permissions<br>Agents receive narrow, time-bound capabilities, never a blanket key. Scope is enforced at the gate, not assumed by the caller.

05<br>Fail-closed by default<br>If policy is unreachable, ambiguous, or mid-update, the action does not execute. Silence is denial. There are no implicit allow paths.

Use cases

Wherever an agent can take an action,a checkpoint belongs.<br>Yebo sits in front of any sensitive operation (financial, contractual, or infrastructural) and enforces what is allowed before the runtime ever sees the call.

Payments<br>Bound transfers, refunds, and payouts to verified policy. Threshold-gated, vendor-scoped, replay-resistant.<br>amount<br>Procurement<br>Verify purchase orders, vendor changes, and budget allocations before they land in your ERP.<br>po.total ≤ budget.remaining

Contracts<br>Gate signatures, amendments, and counterparty changes against legal-approved templates and authority matrices.<br>signer.role ∈ contract.signers

Infrastructure actions<br>Approve or block production changes (IAM grants, secret rotations, schema migrations) at the moment they execute.<br>env = prod ⇒ requires.approval

Protected APIs<br>Wrap any internal or third-party API in a policy gate. Per-call verification with no SDK surgery on the caller.<br>rate.window(60s) ∧ scope = read

Enterprise workflows<br>Multi-step automations stay inside policy as they fan out across systems. Drift, escalation, and side...