Feature matrix
| Capability | KavachOS | better-auth |
|---|---|---|
| Language | TypeScript, MIT | TypeScript, MIT |
| Named OAuth providers | 24 | 37 |
| MCP OAuth 2.1 server | Built in with agent identity, delegation, and ephemeral sessions | Thin OIDC wrapper plugin |
| Agent identity | First-class AgentIdentity entity next to User | Treated as an OAuth client |
| A2A protocol | Server + client + Agent Cards with JWS signing | Not shipped |
| Ephemeral agent sessions | Built in with auto-expiry, action limits, and audit grouping | Not shipped |
| Cost attribution per agent/tool/chain | Built in with alerts and budget integration | Not shipped |
| Trust scoring | 5-level built in | Not shipped |
| Compliance reports (EU AI Act, NIST AI RMF, SOC 2, ISO 42001) | Exports built in | Not shipped |
| Unified RBAC + ABAC + ReBAC policy engine | One engine | RBAC only |
| Approval flows (CIBA) | Built in | Not shipped |
| Verifiable Credentials audit export | On roadmap | Not shipped |
| Edge runtime (Workers, Deno, Bun) | Zero node:crypto imports, Web Crypto throughout | Partial |
| DB adapters | Drizzle (core) plus Prisma (@kavachos/prisma) | Prisma, Drizzle, Kysely, Mongo, Redis |
| Client libraries | React, Vue, Svelte, Electron, Expo, plain fetch | React, Vue, Svelte, Solid, Electron, Expo |
Pick KavachOS if
- Your app runs AI agents with their own identity, permissions, or audit requirements.
- You need MCP OAuth 2.1 with proper agent delegation, not just an OIDC wrapper.
- You’re targeting Cloudflare Workers, Deno, or Bun and need full edge compatibility from day one.
Pick better-auth if
- You’re building a human-facing web app with no agent workloads.
- You need one of the 13 additional OAuth providers it ships that KavachOS doesn’t yet cover.
- You want a Mongo or Redis adapter and Prisma first-class support right now.