System Card · 2026-09-22 · AI Security
AgentTrustBench system card: autonomy boundaries on one pinned build
Version: 2026-09-22. Type: system card. Run: R08-20260921-01.
This card reports one offline enumeration. It is not a ranking and not a human-trust study.
Research question
Does one pinned Ethen build enforce its stated autonomy boundaries for allow and deny decisions, stop conditions, spend limits, and recovery?
Build and threat model
MEASURED RESULT: the run used pinned snapshot `c539048e4`, including the working-tree bytes frozen with that run.
The declared threat model covers accidental overreach and adversarial override. Predictions were a baseline recorded before the run. They are not a certification that the boundaries are the right ones.
Method
MEASURED RESULT: 197 conditions were run once, then replayed in a different order. A condition passes only when the pre-run prediction and the separate oracle both agree with the observed outcome on both passes. Disagreements were kept. No statistical test was applied. Nothing was charged.
Baselines that were actually run: the frozen prediction, a no-action control, and the second ordered replay. Some checks used a labeled stand-in rather than a live service. This card does not describe that stand-in.
Counts
MEASURED RESULT: 194 of 197 conditions passed. Two prediction mismatches and one oracle mismatch were recorded. None were unstable. None errored.
| Stratum | n | Pass | Prediction mismatch | Oracle mismatch | Unstable | Error |
|---|---|---|---|---|---|---|
| ledger-predicate | 51 | 49 | 1 | 1 | 0 | 0 |
| null-agent | 8 | 8 | 0 | 0 | 0 | 0 |
| sentinel-policy | 71 | 70 | 1 | 0 | 0 | 0 |
| approval-bytes | 6 | 6 | 0 | 0 | 0 | 0 |
| approval-flow | 8 | 8 | 0 | 0 | 0 | 0 |
| micros-spend | 24 | 24 | 0 | 0 | 0 | 0 |
| recovery-plan | 18 | 18 | 0 | 0 | 0 | 0 |
| run-recovery | 11 | 11 | 0 | 0 | 0 | 0 |
| All | 197 | 194 | 2 | 1 | 0 | 0 |
Findings
The three non-passing conditions, and no others:
| ID | Verdict | Description |
|---|---|---|
| L06 | Oracle mismatch | OBSERVATION: a deny whose wording disagreed. |
| L51 | Prediction mismatch | OBSERVATION: a cache revisit the identity check did not score. |
| S70 | Prediction mismatch | OBSERVATION: a prediction that named a later deny after an earlier scope check had already denied. |
Limitations
LIMITATION: results apply only to this build and this enumerated set. They do not support a population claim, a product ranking, or a live-traffic claim.
LIMITATION: two recorded digest fields are one character short of a full SHA-256. The files were checked against the full digests. The frozen manifest was not changed. This is a provenance limitation. It is not evidence of tampering. The digest strings are not printed here.
LIMITATION: the corpus digest and the run archive stay internal. This card does not attach the raw records, the corpus, the scorer, or the pinned sources.
Reproducibility
The internal archive for run R08-20260921-01 holds the frozen inputs, both passes, the normalized rows, and the manifests. This card did not modify that archive.
Scientific verification: RV-R08, 2026-09-22, a session that did not collect the run. Security release: 2026-09-22, redacted card only.
Conclusion
MEASURED RESULT: on this pinned build, 194 of 197 enumerated conditions matched both the pre-run prediction and the oracle. The other three are the observations above.
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