Sentinel Observability
A transparent, fail-open MCP observability sidecar. See every agent-tool interaction with cryptographic audit trails you can verify offline.
Transparent Sidecar Architecture
Fail-open by design
<1ms overhead
100% visibility
Canonical Ordered Events
Single, consistent, replayable history with stable event IDs and monotonic ordering.
Session Identity
Stable session_id, trace_id, and span_id for complete request/response correlation.
Cryptographic Integrity
Hash-chained, append-only audit records with Ed25519 signatures.
The Sentinel Philosophy
Sentinel’s Core Guarantees
Identity answers who. Ordering answers in what sequence. Integrity answers can we trust the record. Together, they form the minimum foundation for serious observability - without enforcing policy or constraining agents.
Canonical, Ordered Event Stream
A single, consistent, replayable history of agent activity - with stable event IDs and monotonic ordering derived from observation at the Sentinel boundary (not wall-clock timestamps).
Concurrent tool calls observed at the Sentinel boundary
Key property: ordering is derived from the sequence of bytes observed crossing the Sentinel boundary - not timestamps - allowing a single, replayable history even when async responses race or clocks drift.
Session Identity & Trace Continuity
Stable session_id and trace_id for a run, plus span_id per request with request ↔ response correlation - consistent across tools and errors.
session_id / trace_id / span_idCryptographic Integrity of Telemetry
Hash-chained, append-only audit records with Ed25519 signatures and optional encryption at rest - verifiable offline. Cryptography applies only to telemetry, never to execution.
hash-chain + Ed25519 (+ optional encryption)See EngramAI in Action
Get a personalized walkthrough of the Defense Layer Platform. See how we protect AI agents, RAG systems, and MCP servers with 100% detection accuracy.
What’s included:
Perfect for:
Enterprise AI Teams
Secure your multi-agent workflows and RAG systems at scale.
Financial Services
Meet compliance requirements with cryptographic audit trails.
AI-Native Companies
Ship faster with confidence. Protect your AI infrastructure from day one.