Agent Audit Trail

Compliance infrastructure for agentic AI.

An MCP server that provides immutable audit logging, policy enforcement, and compliance reporting for AI agent workflows. Built for SMBs deploying AI agents who need to demonstrate regulatory compliance (Colorado SB 205, EU AI Act, and emerging state AI legislation).

Employer Summary

This is the strongest repo to review for AI governance, agent safety, and implementation reliability. It shows the part of AI delivery that usually gets ignored in demos: what happened, which tool was called, what data was touched, which policy fired, and whether the record can be trusted later.

Proof points:

• MCP server surface for agent/tool workflows
• hash-chained audit log with integrity verification
• configurable policy rules for PII, financial actions, and destructive operations
• compliance-oriented export path
• production path from local JSON to PostgreSQL/Supabase-style storage

What It Does

Agent Audit Trail sits between your AI agents and their tools, providing:

• Cryptographically Immutable Audit Logging - Every agent action is recorded with full context and a SHA-256 hash chained to the previous entry. Tampering is detectable. Verification is one call away.

• Policy Engine - Configurable rules that evaluate every action in real time. Flag PII access, block high-value financial transactions, detect destructive database operations, or create custom rules for your business.

• Compliance Reporting - Export audit logs in formats suitable for regulatory submissions. Pre-built support for Colorado SB 205 impact assessments and EU AI Act transparency documentation. Exports include a chain integrity verification result.

• Agent Registry - Track which agents are active, what they do, and their historical activity patterns.

Quick Start

Install

npm install -g agent-audit-trail

Add to Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "agent-audit-trail": {
      "command": "agent-audit-trail"
    }
  }
}

Add to Claude Code

claude mcp add agent-audit-trail -- npx agent-audit-trail

Available Tools

Default Policy Rules

Three rules are active out of the box:

1. PII Field Access (High) - Flags access to fields matching SSN, date of birth, email, phone, address, passport, driver license, or credit card patterns.

1. High-Value Financial Action (High) - Flags financial actions with amounts exceeding $1,000.

1. Destructive Action Detection (Critical) - Flags tool calls containing DELETE, DROP, TRUNCATE, or REMOVE operations.

Cryptographic Immutability

Every log entry is chained to the previous one using SHA-256. Each entry stores:

• previous_hash — the hash of the entry before it (null for the first entry)
• hash — SHA-256 of: previous_hash + all entry fields

This means:

• Modifying any historical entry changes its hash, breaking the chain
• Deleting an entry leaves the next entry pointing to a hash that no longer exists
• You can verify the entire chain with verify_chain and get a definitive yes/no answer

Run verify_chain before exporting compliance reports to confirm the chain is intact. The export output includes the verification result.

Example Usage

Logging an action

Use the log_action tool:
- agent_name: "customer-support-bot"
- tool_name: "database_query"
- tool_action: "SELECT"
- parameters: {"query": "SELECT email, phone FROM customers WHERE id = 123"}
- data_fields_accessed: "email,phone"

The server will log the action and return any policy violations (in this case, the PII Field Access rule would flag the email and phone access).

Querying the audit trail

Use the query_logs tool:
- has_violations: true
- limit: 10

Adding a custom policy rule

Use the add_policy_rule tool:
- name: "Block External API Calls"
- description: "Block agents from calling external APIs without approval"
- condition_type: "tool_match"
- condition_operator: "contains"
- condition_value: "external_api"
- action: "block"
- severity: "high"

Data Storage

Audit logs are stored locally at ~/.agent-audit-trail/audit-logs.json by default with full hash chaining. Configure a custom path with the AUDIT_DATA_DIR environment variable.

Production note: Local JSON storage works for single-instance deployments. For multi-agent or distributed setups, swap to Supabase/PostgreSQL for scalable, cloud-hosted storage with the same hash chain guarantees (documentation coming soon).

Regulatory Context

This tool helps businesses demonstrate compliance with:

• Colorado SB 205 (effective Feb 2026) - Requires impact assessments and consumer notifications for AI-driven consequential decisions
• EU AI Act (high-risk enforcement Aug 2026) - Requires transparency, documentation, and human oversight for AI in critical sectors
• Emerging US state AI legislation - Multiple states have pending AI governance requirements

Note: Agent Audit Trail provides logging and reporting infrastructure. It does not constitute legal compliance certification. Consult legal counsel for your compliance program.

Built By

DANZUS Holdings LLC

License

MIT