Architecture & Design - Series Post 49/75

Building a Sandbox Attestation Client: Safe Agent Execution

Published on September 2, 2026 • 7 min read
Building a Sandbox Attestation Client: Safe Agent Execution

Agents must attest they are running inside isolated environments. We review sandbox signature checks.

Attesting Sandbox Isolation at Runtime

If an agent runs directly on host servers, it can access local secrets. Safe architecture requires isolating the agent inside firewalled sandboxes. ATL-Trust checks that every intent contains a valid sandbox attestation code before authorizing database queries.

Our validation gateway checks the environment token presented by the client. If the token indicates that the container has been breached or runs on raw metal, the request fails.

// Sandbox verification in logic.rs
if !intent.sandbox_attestation.starts_with("SANDBOX-ACTIVE-") {
    return Err(ComplianceError::SandboxIsolationFailure);
}

Enforcing Sandbox Presence

The compliance validator tests that the intent's sandbox attestation starts with the correct signature prefix, rejecting requests from unverified environments. This ensures that agent runtimes are strictly isolated.

By requiring sandbox attestation, we contain the execution boundary. Even if the agent attempts to run OS-level system calls, the sandbox environment blocks direct access to host resources.

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