Alternatives to Kastra

Kontext delivers runtime authorization for AI agents — allow-or-deny on every tool call before it executes.

Arcade AI is the MCP authorization runtime that governs every action your AI agents take.

Pre-execution action authorization for AI agents — a deterministic, signed gate on every tool call before it runs.

Guardrail Technologies labels every AI interaction red, yellow, or green before data leaks or compliance breaks.

Task-scoped authorization for AI agents: approve the purpose once, every tool call is verified against it

Runtime security layer that inspects what goes into your AI agents and controls what comes out

agentsh enforces syscall-level policy for AI coding agents — file, network, and process control that holds no matter the prompt.

Pre-execution budget enforcement for AI agents — Cycles denies overspending and risky tool calls before they run.

Prismor intercepts AI agent tool calls at runtime to block destructive commands and cloak secrets before they hit the model.

Adrian is open-source runtime security that reads an AI agent's chain of thought and blocks malicious plans before they execute.

Alice red-teams AI models and agents, then enforces custom guardrails with runtime AI safety policies.

AI governance platform that discovers shadow AI, tests models and agents, and enforces policy at runtime with Guardian Agents.

Astra is a pre-execution safety layer that validates AI agent financial actions before they run.

Agents Shipgate returns a deterministic merge verdict on AI-generated agent PRs before the code lands.

Vorlon enforces AI agent runtime security — blocking policy-violating agent actions, masking sensitive data in transit, and restricting write access at the

Norm Ai encodes legal rules into verifiable AI agents for compliance review, DDQs, and RFPs at regulated institutions.

ElevenAgents Guardrails adds real-time safety checks to voice agents — prompt-injection blocking, reply screening, and custom policy

Traccia traces, costs, evaluates and enforces policy on AI agents — an AI agent control plane you point at agents you already run.

AgentSeal red-teams AI agents and audits MCP servers with 380+ adversarial attack probes from one CLI.

An approval layer that freezes high-risk AI coding agent actions until a human signs off, then writes a signed audit record.

Invariant Guardrails enforces contextual security policies on AI agent tool calls and MCP server connections before they run.

Open-source agent firewall that mediates MCP, HTTP and WebSocket traffic and signs offline-verifiable action receipts.

Agentic AI security and MCP discovery that maps what AI agents can actually reach — from prompt to API to data.

Open-source credential broker and MITM proxy that keeps real API keys out of AI agents.

Unbound is an Agent Access Security Broker that governs what AI coding agents can run, reach, and touch.

Aembit brokers short-lived, policy-scoped credentials for AI agents and MCP servers through an identity control plane.

Trusera's ai-bom discovers, catalogs, and governs every AI agent, model, and pipeline running across your enterprise infrastructure.

Credo AI is an AI governance platform that registers, risk-scores, and continuously monitors every AI agent, model, app, and vendor.

Self-hosted LLM gateway that commits cryptographic evidence before any model response is released.

Mindgard is AI red teaming that reconnoiters, exploits, and retests vulnerabilities in production AI agents and models.