Kastra
Runtime authorization for Claude, Cursor, Codex and OpenClaw
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Kastra is the runtime authorization layer for AI agents. It decides what agents can and cannot do before actions execute, enforcing policies with sub-1 ms latency across tools, prompts, inputs, and outputs. Use one control plane to govern agents and policies across Claude Code, Cursor, Codex, OpenClaw, the Anthropic SDK, the OpenAI SDK, and more. Prevent unauthorized tool use, prompt injection, and exposure of sensitive data before they become incidents. Trust the rules, not the agents.
PH · launched Jul 22, 2026 · 334 upvotes (top 33%) · 0 views
Niche: ai agent guardrail software · 201 launches, 25 in the last 7 days ▲ +25% · Explore this niche →
Category and tags
- Horizontal
- Compliance & governance
- Developer
- AI feature
- Commercial product
- Developer Tools
- Artificial Intelligence
- GitHub
- Security
Visit website ↗ Source listing ↗
More like this: all 201 launches in ai agent guardrail software →
Could you build this?
Partial A standard API proxy for AI requests is straightforward, but achieving sub-1ms authorization, deep protocol interception, and policy enforcement across local coding tools requires low-level systems engineering.
What it would actually take: The architecture requires an embedded local daemon or ultra-low-latency edge proxy (written in Rust or Go) utilizing local eBPF or OS-level IPC interception to monitor and govern tools invoked by Cursor, Claude Code, and terminal agents. The hard part is deterministic policy evaluation (e.g., AST analysis of shell commands, AST-based file modification checks) executing under 1 millisecond without blocking IDE developer experience. This requires deep systems programming, security engineering, and protocol reverse-engineering skills.
Competitors
Other products that read as similar to this one : 722 launches clear the similarity bar, closest 8 shown.
Attention rank: #331 of 723 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 255 days after the earliest competitor.
- Policy enforcement for Claude Code, Cursor, and Codex · hn · 2026-07-09 · 13 upvotes · similarity 0.79
- Critiqor · ph · 2026-10-05 · 2 upvotes · similarity 0.54
- Arcjet for AI coding agents · ph · 2026-10-09 · 14 upvotes · similarity 0.49
- AI Coding Agent Guardrails enforced at runtime · hn · 2026-04-20 · 5 upvotes · similarity 0.49
- agentsentinel · ph · 2026-11-03 · 1 upvotes · similarity 0.49
- NullRun · ph · 2026-09-16 · 1 upvotes · similarity 0.48
- AgentCouncil · github · 2026-10-14 · 15 upvotes · similarity 0.48
- CROA · ph · 2026-09-22 · 11 upvotes · similarity 0.48
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