Agent Firewall v1.3: Enforcing transitive authority in delegated AI agents
ShubhBhangu · reddit · 2026-08-25
Agent Firewall v1.3 has been released, focusing on enforcing transitive authority in delegated AI agent capabilities.
Core Problem & Solution
- Transitive Authority: When A authorizes B, and B authorizes C, C's effective authority is bounded by the entire chain. v1.3 resolves the lineage C -> B -> A and evaluates authorization against every capability in the chain to prevent descendants from laundering authority through their own capabilities.
- Fail-Closed: If a known ancestor cannot be resolved, the descendant is denied. Revocation of a parent or intermediate capability immediately denies descendants.
Technical Implementation
- Implemented a runtime DelegationLineage registry supporting complete ancestry traversal, parent lookup, cycle detection, and thread-safe access.
- The SDK maintains the capability registry separately from lineage metadata.
Testing
- Includes adversarial tests for the delegation model (e.g., constraint laundering, namespace escalation, bypassing revoked parents).
- Added concurrency tests for authorization/revocation and simultaneous delegation.
Availability
- Package: pip install agent-firewall-security==1.3.0
- GitHub: Shubhbhangoo/agent-firewall
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