---
title: "Agent Security Architecture"
docType: AASE
templateVersion: "1.0"
---

# Agent Security Architecture

## Document Control

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## Revision History

| Version | Date | Author | Changes | Approved By | Approval Date |
|---------|------|--------|---------|-------------|---------------|
| [VERSION] | [DATE] | ArcKit AI | Initial creation from `/arckit:agent-security` command | [PENDING] | [PENDING] |

---

## 1. Threat Model

### 1.1 Attack Surface

```mermaid
mindmap
  root((Threat Model))
    Input
      Prompt injection
      Data poisoning
      Context overflow
      Adversarial inputs
      Model probing
      Supply chain attacks
    Execution
      Tool abuse
      Privilege escalation
      Sandboxing escape
      Resource exhaustion
      Tool chain manipulation
      Cross-agent injection
    Output
      Data exfiltration
      PII leakage
      Hallucination
      Prompt template extraction
      Instruction leakage
      Model weights extraction
    Infrastructure
      Model theft
      API abuse
      Side-channel attacks
      Denial of service
      Credential theft
      Infrastructure manipulation
```

### 1.2 Threat Summary

| Threat Category | Dimension | Severity | Frequency | Mitigation |
|----------------|-----------|----------|-----------|-----------|
| [Category 1] | [Dimension] | [Critical/High/Med/Low] | [Likelihood] | [Control] |
| [Category 2] | [Dimension] | [Critical/High/Med/Low] | [Likelihood] | [Control] |

---

## 2. Sandboxing Architecture

| Component | Isolation | Enforcement |
|-----------|-----------|-------------|
| Agent process | [Container/Sandbox] | [OS-level] |
| Tool execution | [Separate process] | [Permission boundary] |
| Memory access | [Scoped] | [RBAC] |
| Network access | [API boundary] | [Egress control] |
| Data I/O | [Context sandbox] | [Input/output separation] |

### 2.1 Isolation Layers

| Layer | Technology | Scope | Escape Risk |
|-------|-----------|-------|------------|
| [OS Level] | [Container/Sandbox] | [Agent process] | [Low/Med/High] |
| [App Level] | [Wasm/Virtualisation] | [Tool execution] | [Low/Med/High] |
| [Data Level] | [Encryption/Tokenisation] | [Memory/Data] | [Low/Med/High] |

---

## 3. Tool Permission Matrix

| Tool | Permission | Agent Access | Risk | Mitigation |
|------|-----------|-------------|------|-----------|
| [Tool 1] | [Read/Write/Execute] | [Full/Limited/None] | [Low/Med/High] | [Control] |
| [Tool 2] | [Read/Write/Execute] | [Full/Limited/None] | [Low/Med/High] | [Control] |
| [Tool 3] | [Read/Write/Execute] | [Full/Limited/None] | [Low/Med/High] | [Control] |
| [Tool 4] | [Read/Write/Execute] | [Full/Limited/None] | [Low/Med/High] | [Control] |
| [Tool 5] | [Read/Write/Execute] | [Full/Limited/None] | [Low/Med/High] | [Control] |

---

## 4. Data Handling Policy

| Data Type | Handling | Agent Access | Retention |
|-----------|----------|-------------|-----------|
| PII | [Encrypt at rest, mask in prompts] | [Allowed/Blocked] | [X days] |
| Sensitive | [Encrypted, scoped access] | [Allowed/Blocked] | [X days] |
| Public | [Standard handling] | [Unrestricted] | [X days] |
| Model weights | [Integrity verified, restricted] | [Read-only] | [Indefinite] |

---

## 5. Prompt Injection Defences

| Defence | Method | Coverage |
|---------|--------|----------|
| Input sanitization | [Regex, LLM guard] | [Direct prompts] |
| Context boundary | [System prompt separation] | [Indirect injection] |
| Output validation | [Schema check, content filter] | [Response] |
| Tool call validation | [Permission check, arg validation] | [Tool abuse] |
| [Defence 5] | [Method] | [Coverage] |
| [Defence 6] | [Method] | [Coverage] |

---

## 6. Output Validation Pipeline

```mermaid
flowchart LR
    A[Agent Output] --> B[Schema Validation]
    B --> C[Content Filter]
    C --> D[PII Scanner]
    D --> E[Human Review (if flagged)]
    E --> F[Release]
```

### 6.1 Pipeline Details

| Stage | Check | Action on Failure | Owner |
|-------|-------|-------------------|-------|
| Schema Validation | [Format, structure, type] | [Reject / Flag] | [System] |
| Content Filter | [Policy, safety, compliance] | [Block / Review] | [System] |
| PII Scanner | [Personal data detection] | [Redact / Review] | [System] |
| Human Review | [Manual assessment] | [Approve / Reject] | [Reviewer] |
| Release | [Final gate] | [Deliver / Escalate] | [System] |

---

## 7. Secret Management

| Secret Type | Storage | Access | Rotation |
|-------------|---------|--------|----------|
| API keys | [Hashicorp Vault] | [Scoped] | [90 days] |
| Model credentials | [Secrets manager] | [Scoped] | [90 days] |
| Database credentials | [Vault] | [Scoped] | [30 days] |
| Encryption keys | [HSM / KMS] | [Scoped] | [30 days] |

### 7.1 Secret Lifecycle

| Phase | Action | Automation | Audit |
|-------|--------|-----------|-------|
| Creation | [Generated / Provided] | [Automated] | [Logged] |
| Storage | [Encrypted at rest] | [Vault-managed] | [Access log] |
| Usage | [Scoped, time-limited] | [Injected at runtime] | [Usage log] |
| Rotation | [Automated cycle] | [Scheduled] | [Audit trail] |
| Revocation | [Immediate disable] | [On-demand] | [Event log] |

---

## 8. Incident Response

| Severity | Response Time | Owner | Actions |
|----------|---------------|-------|---------|
| Critical | [<15 min] | [SRE] | [Isolate, investigate, patch] |
| High | [<1h] | [Security] | [Contain, assess, remediate] |
| Medium | [<24h] | [Team] | [Patch, monitor] |
| Low | [<72h] | [Team] | [Log, review, improve] |

### 8.1 Incident Lifecycle

```mermaid
flowchart LR
    A[Detection] --> B[Triage]
    B --> C{Severity}
    C -->|Critical| D[Immediate isolation]
    C -->|High| E[Containment]
    C -->|Medium| F[Investigation]
    D --> G[Remediation]
    E --> G
    F --> G
    G --> H[Post-mortem]
    H --> I[Prevention update]
```

---

## 9. Traceability

| Source | Reference | Link |
|--------|-----------|------|
| AAGI | [Agent Inventory ID] | [Agent list, risk classifications] |
| AAGR | [Agent Design ID] | [Tool contracts, architecture] |
| SEC / SBD | [Secure by Design ID] | [Security controls, threat models] |
| AAOV | [Governance ID] | [Oversight tiers, compliance] |

---

## Generation Metadata

**Generated by**: ArcKit `/arckit:agent-security` command
**Generated on**: [DATE] [TIME] GMT
**ArcKit Version**: [ARCKIT_VERSION]
**Project**: [PROJECT_NAME] (Project [PROJECT_ID])
**AI Model**: [Model name]
**Generation Context**: [Brief note about source documents used]