APPA: Recoverable Information-Flow Control for Real-World LLM Agents
LLM agents deployed in practical workflows routinely mix private context, untrusted tool and web outputs, and external side effects. While information-flow control (IFC) provides structural defenses against prompt injection, data exfiltration, and confused-deputy attacks, conventional IFC relies on monotone taint tracking that either over-blocks benign operations or permanently strands downstream execution once an agent ingests unvetted data. We present APPA (Agentic Permissions Policy Algebra), which turns agent IFC from an abort-only barrier into a policy-governed recovery system. APPA enforces a dual-phase reference monitor at tool dispatch and protocol gateways (e.g., Model Context Pr...
| Authors | Arseny Kravchenko, Vadim Liventsev, Innokentii Konstantinov et al. |
|---|---|
| Primary category | cs.CR |
| Published | 27 July 2026 |
| Last updated at source | 26 August 2026 |
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