Kastra
Kastra is an AI-powered AI Agents tool — Enforces deterministic policies on AI agent tool calls, ensuring safe and compliant interactions. Best for: AI Agents. Pricing: Freemium (GateOnAI Score: 38/100).
Enforces deterministic policies on AI agent tool calls, ensuring safe and compliant interactions.
Kastra provides an authorization layer that sits in the execution path of every prompt, tool call, shell command, database operation, API request, and agent workflow. Before an action runs, Kastra evaluates attribute‑based policies in under one millisecond and returns allow, deny, redact, or hold, creating a cryptographically chained audit trail for operators, auditors, and agents to explain decisions.\nYou can use the Kastra HTTP API from production agents, install Kastra Edge on developer machines to govern Claude Code, Cursor, and Codex, or connect an MCP client to read governance data. A no‑signup sandbox is available at /sandbox, and a 15‑day self‑serve trial provides API keys without a sales call. Kastra is aimed at agents that need deterministic control over real‑world actions.
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Works Well With
Tools that Kastra genuinely connects with, based on real input/output compatibility data (not just shared category):
- Perplexity - AI-powered search and answer engine.
- PubMed - Free AI-enhanced biomedical literature database
- Mistral - Efficient and high-performance open-weight AI models.
- Ideogram - AI image generator excelling at text within images.
- OpenAlex - Free and open scholarly database with AI search
- Chroma - The AI-native open-source embedding database.