Agent Firewall: Capability-Based Security for AI Tool Access
ShubhBhangu · reddit · 2026-08-26
The author released Agent Firewall v1.4.0, a capability-based authorization framework for securing agent tool calls. Traditional API keys are binary; a leak grants full access. Agent Firewall issues signed, scoped capability tokens (e.g., limiting amount, expiration) and supports delegation, revocation, and cross-chain semantic budgets. A key feature is semantic chain security: the system detects and blocks protected malicious workflows even if individual requests appear valid. The author notes it is a solo project needing documentation work.
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