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What is Kastra?

Kastra acts as a vital authorization framework for AI systems, establishing the permissions of agents, models, and tools before they are executed. Situated along the execution path of numerous interactions, including prompts, tool calls, shell commands, database transactions, and API requests, it assesses each action through deterministic, attribute-based policies, making decisions to allow, deny, redact, or escalate in less than a millisecond. Unlike monitoring solutions that merely observe AI activities after they occur, Kastra takes a preemptive stance, blocking unauthorized actions before they can affect any tools, APIs, databases, or production systems. Its extensive control plane encompasses a policy engine, edge decision-making features, multiple integrations, and a tamper-proof evidence vault that securely records each decision for future auditing and replay. Additionally, with the introduction of Kastra Edge, local enforcement capabilities are broadened to developer environments, protecting coding agents like Claude Code, Cursor, and Codex CLI from malicious commands, unauthorized data access, unsafe file changes, and incorrect tool usage. This forward-thinking approach to authorization not only bolsters security but also guarantees compliance and accountability in AI-driven operations, fostering a more trustworthy environment for users. By ensuring that all actions are rigorously vetted, Kastra significantly mitigates potential risks associated with AI technologies.

What is Antaeus?

Antaeus acts as a semantic policy engine aimed at developers focused on evaluating human-written rules concerning language, context, intent, or exceptions. The engine is built on an open-source core using Go and includes a command-line interface capable of loading policy artifacts in either YAML or JSON formats, validating them against versioned schemas while carrying out named regression tests. Through this evaluation process, it produces definitive results such as allow, review, deny, or failure, along with the identification of the policy and supporting evidence for the decisions rendered, while delegating the tasks of authentication, authorization, and subsequent actions to the application itself. Developers have the flexibility to run a deterministic, credential-free local workflow or take advantage of an experimental hosted dashboard and API for managing policies and assessing various inputs. Additionally, an experimental OpenAI evaluator is also available for testing purposes. It is essential to keep in mind that Antaeus is still in its developmental phase; therefore, the capacity of the hosted service is somewhat constrained and lacks a production-level service level agreement (SLA), which may lead to reliability issues when demand is high. As such, potential users should consider these limitations when integrating Antaeus into their workflows.

Media

Media

No images available

Integrations Supported

OpenAI
Claude Code
Codex CLI
Cursor
Go
Google Sheets
JSON
Java
Microsoft Excel
OpenClaw
Python
Rust
Slack
Swift
TypeScript
YAML

Integrations Supported

OpenAI

API Availability

Has API

API Availability

Has API

Pricing Information

$19.99 per month
Free Version

Pricing Information

Free
The local Go engine is available under the Apache-2.0 license at no charge. Hosted usage includes a shared free allowance of up to 100 completed decisions per day, subject to shared capacity and without a production SLA. Paid usage is available through credit purchases starting at $10; hosted evaluation charges are usage-based.
Free Version

Supported Platforms

SaaS
Mac

Supported Platforms

SaaS
Mac
On-Prem
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub
Online Training

Training Options

Documentation Hub

Company Facts

Organization Name

Kastra

Date Founded

2026

Company Location

United States

Company Website

kastra.ai/

Company Facts

Organization Name

Antaeus

Company Website

antaeus.io

Categories and Features

AI Governance

Not specified

Categories and Features

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