AI Developer Tools

Attestor

Attestor is an open-source control infrastructure that sits between AI agents and execution systems, ensuring policy compliance and safety for high-risk operations.

What is Attestor?

Attestor is a zero-trust execution boundary that validates AI agent actions against policy, authority, and evidence before allowing execution, returning admit, narrow, review, or block decisions.

Attestor vs Similar AI Tools

Pricing ModelFreeFreeCustom PricingFree, Paid
Free Credits
Key Features
  • Policy checking and enforcement
  • Approval and authority verification
  • Replay protection and freshness checks
  • GitHub Pages hosting
  • Jekyll integration
  • Markdown content support
  • Workload monitoring and anomaly detection
  • Slow query identification and optimization
  • Natural language querying to SQL translation
  • Scans skills and MCP servers against ATR rules before loading
  • Real-time runtime protection against prompt injection and hijacks
  • Signed audit-ready evidence for compliance (EU AI Act, NYDFS, DORA)
Pros
  • Open-source with no licensing costs
  • Zero-trust approach for AI agent safety
  • Free hosting with custom domain support
  • Easy setup via Git
  • Quick one-line installation and setup in 15 minutes
  • Self-hosted ensures data stays within your infrastructure
  • Open source with MIT license
  • Real-time detection and prevention
Cons
  • Currently in evaluation stage (v0.3.0-evaluation)
  • Requires integration and customer-owned gate
  • Limited to static content
  • No server-side processing
  • Requires self-hosting and VPC setup
  • No free tier or trial mentioned
  • Enterprise features require paid tiers
  • Setup may require technical expertise
Best For
  • Organizations deploying AI agents in high-risk financial, data, or operational contexts
  • Developers
  • Open source projects
  • Database administrators
  • Data engineers
  • Developers building and deploying AI agents
  • Enterprises needing audit-ready AI security

How to use Attestor?

  1. 1Run the smallest local refund path to see the decision trail.
  2. 2Run in shadow pilot mode to observe real action paths.
  3. 3Integrate Attestor by placing the customer-owned gate between AI and execution.

Attestor Key Features

  • Policy checking and enforcement
  • Approval and authority verification
  • Replay protection and freshness checks
  • Scope and tenant validation
  • Shadow pilot mode for observation
  • Evidence tracking and proof references

Attestor Use Cases

  • Money movement (refunds, payouts, supplier payments)
  • Data movement (customer exports, warehouse queries)
  • Authority changes (grants, revocations, approvals)
  • External communication (customer-facing messages)
  • Operational execution (deploys, secret rotations)
  • Programmable money (wallet calls, Safe transactions)

Attestor Pricing & Free Credits

Attestor currently operates on a Free model.

This tool is completely free to use

Open Source

Free

Free to use under open-source license.

Attestor Pros & Cons

Pros

  • Open-source with no licensing costs
  • Zero-trust approach for AI agent safety
  • Mapped to NIST AI RMF and ISO 42001
  • Supports multiple operation classes
  • Shadow pilot mode enables risk-free observation

Cons

  • Currently in evaluation stage (v0.3.0-evaluation)
  • Requires integration and customer-owned gate
  • Not yet production-ready for live deployments

What is Attestor best for?

  • Organizations deploying AI agents in high-risk financial, data, or operational contexts

Attestor FAQ

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