ferrumdeck-policy

The enforcement engine of FerrumDeck — a deterministic, in-path governance layer for AI agents. It returns an allow / deny / requires-approval decision before a tool call executes, rather than charting it after the fact. The decision path is sub-millisecond (see docs/benchmarks/enforcement-latency.md).

What's in the box:

Deny-by-default tool allowlist — PolicyEngine / ToolAllowlist.
Airlock RASP — per-call anti-RCE matcher + data-exfiltration shield (AirlockInspector, shadow/enforce modes).
R1–R3 reversibility ladder — graduated response mapped onto the DeepMind AI Control Roadmap tiers (graduated_response, ResponseLevel).
EU AI Act Article 50 transparency rule — check/enforce for AI-disclosure + machine-readable marking.

Published as ferrumdeck-policy; the Rust import path is fd_policy:

[dependencies]
ferrumdeck-policy = "0.7"

use fd_policy::{PolicyEngine, ToolAllowlist};

let engine = PolicyEngine::default();
let allowlist = ToolAllowlist {
    allowed_tools: vec!["read_file".into()],
    approval_required: vec![],
    denied_tools: vec!["delete_repo".into()],
};
// Deny-by-default: only allowlisted tools pass.
assert!(engine.evaluate_tool_call_with(&allowlist, "read_file").is_allowed());
assert!(engine.evaluate_tool_call_with(&allowlist, "delete_repo").is_denied());
assert!(engine.evaluate_tool_call_with(&allowlist, "unknown").is_denied());

Prefer a single dependency? The ferrumdeck umbrella crate re-exports this engine.

Licensed under Apache-2.0. Source + full control plane: https://github.com/sattyamjjain/ferrumdeck.

ferrumdeck-policy 0.7.15

ferrumdeck-policy