You can't
wall the sky.
Keep what's yours.
Agentic AI is already everywhere — acting on your behalf, reaching where you can’t watch. StoneSky™ builds the infrastructure that holds it: you run it, you hold the keys, and in the default posture we can’t read your data. Not a policy promise — how it’s built.
The sky changed.
Stone doesn't.
Agents act on their own now — calling tools, moving data across borders, routing to whatever model answers fastest. That autonomy is the value and the exposure in the same breath. The dread isn’t hackers at a gate; it’s weather — airborne, already everywhere, crossing every border at once. You can’t lock the sky. You can keep what’s yours.
Compliance is not security.
A framework tells you what to document and prove after the fact. Security is what actually stops someone reading your documents — before the fact. We design for security first; the audit trails and fail-closed defaults that satisfy an auditor fall out as a byproduct. The checkbox is never the design target.
Power you own beats purity you don't.
Every other security brand makes the threat the monster and the product the wall — slay it, lock the gate. We don’t. Your agents are powerful, half-wild, immensely valuable, and dangerous precisely because they can act. You don’t want them gone. You want them kept — fed, bound, watched, flying on your command and no one else’s.
Threat and power.
The thing that won’t be contained. The autonomy you can’t give up.
The holding. The line.
We are the one structure where solid and free coexist. You never have to choose.
What you keep
Five marks, one house. Each is a standard your agents fly under — a role cut into geometry on a shared construction grid. One ships today; the rest are named honestly, because an honest roadmap survives diligence.
SkyKeep™
The memory your agents share — kept where only you can read it. Your keys, your hosting, by default.
Not by policy. By construction.
SkySigil™
A policy firewall for AI traffic — who may call which model, with what class of data, decided before the call happens.
In active development. Invariants locked.
SkyChest™
A credential broker for AI agents — it does the authenticated work and hands back only the result. The agent never sees the token.
In active development. Invariants locked.
SkyWarden™
A harness for agents doing real, independent work — a policy boundary for what they may do, wherever they fly.
Planned. Same spine, same principles.
SkyGarrison™
We hold the watch. You keep the keys — and your data.
StoneSky™ never holds your data.
One stronghold. Defenses around the core.
Your perimeter — single-tenant, in your residency. The core is yours; the wall is ours. Nothing crosses without passing the gate.
Single-tenant by default. One occupant, one keep — never pooled, never shared.
One door in — every read passes a single enforcement gate, and nothing argues its way past it. SkySigil™ (in development) will stand the same watch over outbound model calls.
Your data stays in your region. Where it lives is your line to draw, not ours.
Custody is yours. You keep the keys and the audit log — you stay your own custodian.
By construction, not by policy.
Don’t take our word — check the architecture. We built it so we couldn’t betray you even if we wanted to. It doesn’t trust the cloud, the vendor, or even itself.
One door in
Every read passes a single gate — person, workload, and machine verified independently, every time, failing closed.
Nothing leaks between compartments
Answers never combine material across security boundaries. A query cleared for one compartment cannot surface, quote, or infer from another.
Nothing off the record
Every access — allowed and refused — lands in a tamper-evident log you hold. Even reading the log is logged.
Teardown you can watch
When the engagement ends, deletion is a command your team can watch run — not a hope, and not a retention policy.
We don't slay
your dragons.
We keep them yours.
Power you can’t kill — power you can keep. The stronghold for agentic AI.