System Architecture
Understanding the ABS Core Gateway and Agent IAM infrastructure.
System Architecture
ABS Core is a strict Layer 7 API Gateway and Identity Access Management (IAM) hub designed specifically for AI Agents and the Model Context Protocol (MCP). It operates by intercepting agent-to-tool communications, evaluating intents, injecting secrets "just-in-time" (JIT), and recording an immutable audit trail.
Unlike standard reverse proxies, ABS Core is optimized for the non-deterministic nature of Large Language Models (LLMs). It decodes natural language parameters and MCP payloads to ensure they match statically defined corporate policies before any high-stakes infrastructure is touched.
The Agent Authentication Flow
The standard execution lifecycle of an ABS-governed request operates in a strict, fail-closed loop:
- Authentication & Attribution: An agent identity (OID) initiates a request targeting an external tool or MCP Server.
- Payload Interception: The ABS Gateway intercepts the communication at the network or SDK layer.
- Intent Validation: The sandbox validates the payload against the agent's assigned Compliance Profile (schema validation, scope limits, semantic risk).
- Secret Injection: If the policy evaluates to
ALLOW, ABS Core dynamically injects the required API keys (e.g., Stripe, AWS, GitHub) into the payload. The LLM never holds the keys in its context window. - Execution & Auditing: The request is forwarded to the destination. The entire interaction (prompt, intent, decision, timestamp) is cryptographically hashed and appended to an append-only audit log.
Core Components
The architecture avoids complex distributed sidecars in favor of a stateless core evaluated at the edge.
1. The Gateway (Interception Layer)
The Gateway acts as the secure entry point. It can be deployed as an HTTP Proxy overriding the baseURL of major AI SDKs (OpenAI, Anthropic, Vercel AI SDK), or as a middleware within MCP configurations. It guarantees that no unverified payload reaches the application tools.
2. Stateless Policy Engine (WASM)
To minimize latency—the critical enemy of AI UX—ABS Core utilizes WebAssembly (WASM) modules to evaluate policies. When a request arrives, the WASM engine evaluates the payload against the pre-compiled Governance DSL without requiring heavy container cold starts.
3. JIT Credential Vault
The most critical vulnerability in autonomous systems is credential exfiltration (e.g., prompt injection convincing an LLM to output its database password). ABS Core's vault intercepts the outgoing tool call and injects the necessary authorization headers after validation, ensuring the LLM model never has read access to production secrets.
4. Deterministic Audit Trail
Compliance requires proof. Every decision produced by the Policy Engine generates an event log containing the agent's OID, the evaluation context, the policy version applied, and the outcome (ALLOW/DENY). These logs are hashed sequentially, providing cryptographic proof that the governance layer was not bypassed.
Deployment Topologies
To accommodate different enterprise compliance frameworks, ABS Core supports distinct deployment strategies:
- Cloud/Edge Proxy: The fastest implementation. Traffic is routed through ABS's managed edge network, adding <5ms of overhead to the total LLM roundtrip.
- VPC Self-Hosted Gateway: For organizations with strict data residency requirements (e.g., HIPAA, SOC2, FedRAMP), the gateway can be deployed within the customer's Virtual Private Cloud (AWS, Azure, GCP) using lightweight Docker containers.
- Embedded MCP Middleware: For local or high-security internal agent loops, the runtime can be embedded directly into custom MCP Host implementations.
Security Model
The architecture relies on the principle of Zero Trust for Agents:
- No Implicit Scope: Every agent starts with zero access rights. Policies explicitly grant access to specific tools, parameters, or domains.
- Immutable Separation: The evaluation engine (WASM) is isolated from the routing layer. Policies cannot modify the engine, and the engine cannot alter the policies.
- Fail-Closed Operations: If the policy engine times out, encounters malformed payloads, or detects memory anomalies, the default behavior is to drop the connection and alert the operations team.