Kybernis
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Deterministic execution for AI systems

Stop multi-agent systems from spiraling: policy, ledger, and control for every side-effect.

Kybernis is production infrastructure for A2A and MCP. It prevents runaway loops, silent failures, and unbounded spend by enforcing idempotency, budgets, retries, and approval gates before anything irreversible happens.

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SPAN_START · Decide · Enforce · SPAN_END
Execution invariant

Every irreversible action must be preceded by a policy verdict and recorded as a span.

  • SPAN_START → /infra/decide → enforce → SPAN_END
  • Proxy + SDK, one contract
  • Run receipts for replay-safe audit
Problems With Production Multi Agent Systems

The hidden costs of A2A and MCP in production

In production, A2A and MCP unlock collaboration, but they do not prevent cost blowups, coordination failures, or silent loops. A recent 11‑day agent loop produced a 47,000 USD bill while the system appeared healthy.

Field note
47,000 USD surprise

Two agents looped for 11 days. The system looked healthy, but the bill did not.

Field note
A2A is necessary, not sufficient

A2A makes coordination possible, but without guardrails it amplifies mistakes.

Field note
MCP standardizes access

MCP makes tools shareable, but it does not enforce budgets or dedupe.

Failure modes

Seven production failures you must expect

  • Infinite loops that quietly burn budget
  • Context truncation that drops critical decisions
  • Cascading errors across agents
  • Silent failures with no alert
  • Token explosions from over-context
  • Coordination deadlocks and stalls
  • Works locally, fails in production
What this unlocks

One command deployment, automatic guardrails, real‑time cost tracking, and deterministic receipts. Kybernis exists to close that gap.

Deterministic execution

Before anything real happens, Kybernis checks policy and records a span in the ledger.

Exactly-once side-effects

Stops duplicates (idempotency) and safely retries when something fails.

Run & cost governance

Budget caps, retry policy, allowlists, and tool downtime policies enforced inline.

Audit-ready ledger

Run receipts and span timelines make every execution traceable and replay-safe.

How Kybernis works

Kybernis sits between your agent runtime and irreversible actions. The control plane decides, the execution plane enforces, and the app plane emits spans for anything outside HTTP — in plain terms: ask, act, record.

01
Control plane
Central policy, budget, and decision endpoints. In plain terms: rule checks.
02
Execution plane
Proxy + gates enforce idempotency, budgets, and approvals at the side-effect boundary.
03
Application plane
SDK emits spans for non-HTTP tools so your ledger stays complete.
curl -X POST $KYB_API_BASE/infra/decide
{"tenant_id":"...","run_id":"...","span_id":"..."}
# verdict: allow | deny | require_approval
Kybernis returns policy verdicts with retry/budget directives and proxy headers.

Drop-in proxy or SDK spans

Route HTTP side-effects through the Kybernis proxy for zero-code changes, or use the SDK to emit spans for tools, LLM calls, and internal actions — in plain terms: proxy for web, SDK for everything else.

A2A gives agents a shared language. MCP gives them shared tools. Kybernis adds the governance layer so those tools never bypass budget, dedupe, or policy.
Proxy guardrails

Idempotency, retries, budgets, verdict headers.

SDK spans

Complete ledger for non-HTTP execution paths.

KSP v1

Span-first protocol for SPAN_START / SPAN_END events with policy, usage, and cost.

See the full schema →
Budget enforcement

Inline cost caps + call limits, enforced before side-effects happen.

Ready to keep your agent systems under control?

Deploy with guardrails, avoid runaway costs, and prove every side‑effect.

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