diff --git a/docs/integration/openshell.md b/docs/integration/openshell.md
new file mode 100644
index 0000000..664095d
--- /dev/null
+++ b/docs/integration/openshell.md
@@ -0,0 +1,92 @@
+# Integration: NVIDIA OpenShell
+
+[NVIDIA OpenShell](https://github.com/NVIDIA/OpenShell) is a sandbox runtime
+that enforces filesystem, process, network, and inference policy. OpenShell
+emits machine-readable OCSF events for observable sandbox behavior. A TRACE
+adapter can bind those events to an execution record without treating a
+control-plane log as hardware attestation.
+
+## Assurance boundary
+
+An OpenShell import has the following mandatory TRACE signals:
+
+| TRACE field | Value |
+|---|---|
+| `origin.kind` | `third-party-control-plane` |
+| `origin.producer` | `nvidia-openshell/<version>` |
+| `runtime.platform` | `software-only` |
+| `appraisal.status` | `none` |
+
+Docker, Podman, Kubernetes, or MicroVM isolation does not establish a TRACE
+hardware platform. A record may claim a hardware platform only when it carries
+the corresponding quote, freshness binding, workload measurement, and
+independent appraisal.
+
+## Evidence inputs
+
+Use the complete OCSF JSONL export, not the shorthand stream returned by
+`openshell logs`. The gateway stream is bounded and volatile. The JSONL files
+inside the sandbox contain full OCSF objects, rotate daily, and retain three
+files, so a production collector must export them continuously.
+
+The adapter requires:
+
+1. Effective OpenShell policy bytes and revision.
+2. AGT Agent Control Specification manifest bytes.
+3. Complete OCSF JSONL for the execution interval.
+4. ACS application-policy decisions for the same sandbox execution.
+5. Sandbox identifier and immutable workload or image digest.
+6. Operator-supplied workload identity, model identity, data class, and public
+   record-signing key.
+
+## Policy binding
+
+OpenShell and ACS enforce different layers. Bind both into one canonical policy
+bundle:
+
+```json
+{
+  "format": "agentrust.openshell-policy-bundle.v1",
+  "openshell": {
+    "revision": "42",
+    "enforcement_mode": "enforce",
+    "content": "<base64 exact effective policy bytes>"
+  },
+  "agt_acs": {
+    "enforcement_mode": "enforce",
+    "content": "<base64 exact ACS manifest bytes>"
+  }
+}
+```
+
+`policy.bundle_hash` is the digest of the canonical bundle bytes. The record's
+single `policy.enforcement_mode` is the weakest mode among the layers:
+
+- `enforce` only when both layers enforce;
+- `advisory` when either layer evaluates without blocking;
+- `silent` when a layer enforces while suppressing operational logs.
+
+## Transcript binding
+
+`tool_transcript.hash` commits to a canonical envelope containing:
+
+- sandbox identifier;
+- capture start and end;
+- completeness assertion and source-file digest;
+- composite policy bundle hash;
+- ordered ACS decisions;
+- ordered full OCSF event objects.
+
+Reordering an event, changing a policy revision, or changing an ACS decision
+changes the transcript commitment. An incomplete capture must not be emitted as
+a complete TRACE transcript.
+
+## Implementation
+
+The `agentrust-trace-adapters` package exposes `OpenShellEvidence` and
+`build_openshell_record`. Evidence assembly returns an unsigned Level 0 record;
+signing remains a separate `agentrust_trace.sign_record` operation so callers
+cannot accidentally conflate collection with key custody.
+
+See the runnable integration in
+[`agentrust-io/integrations`](https://github.com/agentrust-io/integrations/tree/main/integrations/openshell).
diff --git a/mkdocs.yml b/mkdocs.yml
index 99ce970..fa5a625 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -93,6 +93,7 @@ plugins:
           - docs/schema.md
         Integration:
           - docs/integration/agt.md
+          - docs/integration/openshell.md
           - docs/integration/cmcp.md
           - docs/integration/sandbox-runtime.md
         Platforms:
@@ -196,6 +197,7 @@ nav:
       - Content Marking v1: spec/content-marking-v1.md
   - Integration:
       - AGT: docs/integration/agt.md
+      - NVIDIA OpenShell: docs/integration/openshell.md
       - cMCP: docs/integration/cmcp.md
       - Sandboxed agent runtimes: docs/integration/sandbox-runtime.md
   - Platforms: