diff --git a/schemas/trace-claim.json b/schemas/trace-claim.json
index 5f69e69..73f8805 100644
--- a/schemas/trace-claim.json
+++ b/schemas/trace-claim.json
@@ -6,7 +6,7 @@
   "type": "object",
   "required": [
     "eat_profile", "iat", "subject", "model", "runtime", "policy",
-    "data_class", "build_provenance", "appraisal", "transparency", "cnf"
+    "data_class", "build_provenance", "appraisal", "cnf"
   ],
   "properties": {
     "eat_profile": {"type": "string", "const": "tag:agentrust-io.com,2026:trace-v0.2"},
@@ -58,6 +58,21 @@
       },
       "additionalProperties": false
     },
+    "origin": {
+      "type": "object",
+      "description": "Where imported evidence came from. A non-self origin cannot carry a hardware runtime platform.",
+      "required": ["kind", "producer"],
+      "properties": {
+        "kind": {
+          "type": "string",
+          "enum": ["self", "third-party-control-plane", "log-import"]
+        },
+        "producer": {"type": "string", "minLength": 1},
+        "source_event_id": {"type": "string", "minLength": 1},
+        "ingested_at": {"type": "integer", "minimum": 1700000000}
+      },
+      "additionalProperties": false
+    },
     "build_provenance": {
       "type": "object",
       "required": ["slsa_level", "digest"],
@@ -100,5 +115,27 @@
       "additionalProperties": false
     }
   },
-  "additionalProperties": false
+  "additionalProperties": false,
+  "allOf": [
+    {
+      "if": {
+        "required": ["origin"],
+        "properties": {
+          "origin": {
+            "required": ["kind"],
+            "properties": {
+              "kind": {"enum": ["third-party-control-plane", "log-import"]}
+            }
+          }
+        }
+      },
+      "then": {
+        "properties": {
+          "runtime": {
+            "properties": {"platform": {"const": "software-only"}}
+          }
+        }
+      }
+    }
+  ]
 }
diff --git a/tests/conftest.py b/tests/conftest.py
index 83c1bc5..c2ed74c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,6 +14,11 @@ def load_vector(filename):
     return json.loads((VECTORS_DIR / filename).read_text())
 
 
+@pytest.fixture(name="load_vector")
+def load_vector_fixture():
+    return load_vector
+
+
 def load_schema():
     return json.loads((SCHEMAS_DIR / "trace-claim.json").read_text())
 
@@ -26,7 +31,9 @@ def _canonical_json(d: dict) -> bytes:
     return json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True).encode()
 
 
-def _build_signed_cmcp_record(*, platform: str = "tpm2", nonce: str | None = None) -> tuple[dict, Ed25519PrivateKey]:
+def _build_signed_cmcp_record(
+    *, platform: str = "tpm2", nonce: str | None = None
+) -> tuple[dict, Ed25519PrivateKey]:
     """Return (record, private_key) for a fully-signed cmcp-runtime claim.
 
     The signature covers the canonical JSON of the envelope with the 'signature'
diff --git a/tests/test_openshell_import.py b/tests/test_openshell_import.py
new file mode 100644
index 0000000..688ae3b
--- /dev/null
+++ b/tests/test_openshell_import.py
@@ -0,0 +1,43 @@
+"""Conformance coverage for records imported from an OpenShell control plane."""
+
+from __future__ import annotations
+
+import copy
+import time
+
+import jsonschema
+import pytest
+
+from trace_tests.result import Status
+from trace_tests.runner import run
+
+
+def _failures(results):
+    return [
+        finding
+        for findings in results.values()
+        for finding in findings
+        if finding.status is Status.FAIL
+    ]
+
+
+def test_openshell_import_is_level0_conformant(schema, load_vector) -> None:
+    record = load_vector("valid_openshell_import.json")
+    record["iat"] = int(time.time())
+
+    jsonschema.validate(record, schema)
+    assert _failures(run(record, "trace", 0)) == []
+
+
+def test_imported_openshell_evidence_cannot_claim_hardware(schema, load_vector) -> None:
+    record = copy.deepcopy(load_vector("valid_openshell_import.json"))
+    record["runtime"]["platform"] = "intel-tdx"
+
+    with pytest.raises(jsonschema.exceptions.ValidationError):
+        jsonschema.validate(record, schema)
+
+
+def test_openshell_import_does_not_require_transparency_at_level0(schema, load_vector) -> None:
+    record = load_vector("valid_openshell_import.json")
+    assert "transparency" not in record
+    jsonschema.validate(record, schema)
diff --git a/tests/vectors/valid_openshell_import.json b/tests/vectors/valid_openshell_import.json
new file mode 100644
index 0000000..ab6ecfc
--- /dev/null
+++ b/tests/vectors/valid_openshell_import.json
@@ -0,0 +1,43 @@
+{
+  "eat_profile": "tag:agentrust-io.com,2026:trace-v0.2",
+  "iat": 1775014139,
+  "subject": "spiffe://example.org/agent/codex",
+  "model": {
+    "provider": "openai",
+    "model_id": "gpt-5"
+  },
+  "runtime": {
+    "platform": "software-only",
+    "measurement": "sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+  },
+  "policy": {
+    "bundle_hash": "sha256:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+    "enforcement_mode": "enforce",
+    "version": "openshell-acs-v1"
+  },
+  "data_class": "internal",
+  "tool_transcript": {
+    "hash": "sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
+    "call_count": 1
+  },
+  "origin": {
+    "kind": "third-party-control-plane",
+    "producer": "nvidia-openshell/0.3.0",
+    "source_event_id": "sbx-123"
+  },
+  "build_provenance": {
+    "slsa_level": 0,
+    "digest": "sha256:dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
+  },
+  "appraisal": {
+    "status": "none",
+    "verifier": "nvidia-openshell/0.3.0"
+  },
+  "cnf": {
+    "jwk": {
+      "kty": "OKP",
+      "crv": "Ed25519",
+      "x": "11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo"
+    }
+  }
+}