diff --git a/internal/schemavalidators/internal_schemas/aisecuritycontext/ai-security-context-0.1.schema.json b/internal/schemavalidators/internal_schemas/aisecuritycontext/ai-security-context-0.1.schema.json
index ac79ee432..581e11156 100644
--- a/internal/schemavalidators/internal_schemas/aisecuritycontext/ai-security-context-0.1.schema.json
+++ b/internal/schemavalidators/internal_schemas/aisecuritycontext/ai-security-context-0.1.schema.json
@@ -183,6 +183,101 @@
         "anchor_verification": {
           "type": "string",
           "description": "Anchor checking mode, e.g. \"relocating\" \u2014 model line numbers may be corrected when the quoted bytes are found elsewhere in the same blob"
+        },
+        "trace_discover": {
+          "$ref": "#/definitions/trace_discover"
+        }
+      }
+    },
+    "trace_discover": {
+      "type": "object",
+      "title": "Trace discover outcome",
+      "description": "Outcome of the Chainloop graph lookup that resolves fingerprint commits without a Chainloop-Trace-Sessions trailer to AI coding sessions. Lets a reader tell 'no AI sessions' from 'the lookup could not run or was refused'. Absent in artifacts produced before the field existed.",
+      "additionalProperties": false,
+      "required": [
+        "status"
+      ],
+      "properties": {
+        "status": {
+          "type": "string",
+          "enum": [
+            "ran",
+            "disabled",
+            "cli_not_found"
+          ],
+          "description": "ran: the lookup ran and the counters are set. disabled: the scan ran with --trace-discover=false. cli_not_found: no chainloop CLI was found, so the lookup could not run."
+        },
+        "commits": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Distinct fix and introducing commits looked up: those whose trailer declared no session."
+        },
+        "matched": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Commits that resolved to at least one AI coding session. Never more than commits."
+        },
+        "not_found": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Commits with no node in the Chainloop graph, that is commits that are not attested."
+        },
+        "denied": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Lookup calls the control plane refused (PermissionDenied or Unauthenticated). Non-zero means the graph was not readable, not that it was empty. Counts calls, so it can exceed commits."
+        },
+        "failed": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Other failed lookup calls: CLI errors, unparseable output, a referenced attestation or session material that cannot be read, or a material without a session id. Counts calls, so it can exceed commits."
+        }
+      },
+      "if": {
+        "properties": {
+          "status": {
+            "const": "ran"
+          }
+        }
+      },
+      "then": {
+        "required": [
+          "commits",
+          "matched",
+          "not_found",
+          "denied",
+          "failed"
+        ]
+      },
+      "else": {
+        "not": {
+          "anyOf": [
+            {
+              "required": [
+                "commits"
+              ]
+            },
+            {
+              "required": [
+                "matched"
+              ]
+            },
+            {
+              "required": [
+                "not_found"
+              ]
+            },
+            {
+              "required": [
+                "denied"
+              ]
+            },
+            {
+              "required": [
+                "failed"
+              ]
+            }
+          ]
         }
       }
     },
diff --git a/internal/schemavalidators/schemavalidators_test.go b/internal/schemavalidators/schemavalidators_test.go
index cca1936a7..5bf0a51d2 100644
--- a/internal/schemavalidators/schemavalidators_test.go
+++ b/internal/schemavalidators/schemavalidators_test.go
@@ -641,6 +641,81 @@ func TestValidateSecurityContextTriageFields(t *testing.T) {
 	})
 }
 
+// TestValidateSecurityContextTraceDiscover covers the optional
+// provenance.trace_discover object: the counters are required when the lookup
+// ran and forbidden otherwise, and an artifact without the object stays valid.
+func TestValidateSecurityContextTraceDiscover(t *testing.T) {
+	const status = "status"
+	onlyStatus := func(s string) map[string]any {
+		return map[string]any{status: s}
+	}
+	ran := func(commits, matched, notFound, denied, failed int) map[string]any {
+		return map[string]any{
+			status:      "ran",
+			"commits":   commits,
+			"matched":   matched,
+			"not_found": notFound,
+			"denied":    denied,
+			"failed":    failed,
+		}
+	}
+	// with and without vary a lookup where every call was denied.
+	with := func(key string, value any) map[string]any {
+		td := ran(88, 0, 0, 88, 0)
+		td[key] = value
+		return td
+	}
+	without := func(keys ...string) map[string]any {
+		td := ran(88, 0, 0, 88, 0)
+		for _, k := range keys {
+			delete(td, k)
+		}
+		return td
+	}
+
+	testCases := []struct {
+		name          string
+		traceDiscover map[string]any // nil leaves the field out
+		wantErr       string
+	}{
+		{name: "absent, as in older artifacts"},
+		{name: "ran with every call denied", traceDiscover: ran(88, 0, 0, 88, 0)},
+		{name: "ran with matches", traceDiscover: ran(12, 3, 9, 0, 0)},
+		{name: "disabled without counters", traceDiscover: onlyStatus("disabled")},
+		{name: "cli_not_found without counters", traceDiscover: onlyStatus("cli_not_found")},
+		{name: "missing status", traceDiscover: without(status), wantErr: "missing properties"},
+		{name: "unknown property", traceDiscover: with("session_ids", []any{"x"}), wantErr: "additionalProperties"},
+		{name: "unknown status", traceDiscover: onlyStatus("skipped"), wantErr: "enum"},
+		{name: "negative counter", traceDiscover: with("denied", -1), wantErr: "minimum"},
+		{name: "ran without counters", traceDiscover: onlyStatus("ran"), wantErr: "missing properties"},
+		{name: "ran with some counters", traceDiscover: without("not_found", "failed"), wantErr: "missing properties"},
+		{name: "disabled with counters", traceDiscover: with(status, "disabled"), wantErr: "not failed"},
+		{name: "cli_not_found with counters", traceDiscover: with(status, "cli_not_found"), wantErr: "not failed"},
+		{name: "counter as a string", traceDiscover: with("commits", "3"), wantErr: "expected integer"},
+		{name: "counter as a non-integer number", traceDiscover: with("matched", 1.5), wantErr: "expected integer"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			payload, ok := loadJSONFile(t, "./testdata/ai_security_context_valid.json").(map[string]any)
+			require.True(t, ok, "the fixture must be a JSON object")
+
+			provenance, ok := payload["provenance"].(map[string]any)
+			require.True(t, ok, "the fixture must carry a provenance object")
+			if tc.traceDiscover != nil {
+				provenance["trace_discover"] = tc.traceDiscover
+			}
+
+			err := schemavalidators.ValidateSecurityContext(payload, "")
+			if tc.wantErr == "" {
+				require.NoError(t, err)
+				return
+			}
+			require.ErrorContains(t, err, tc.wantErr)
+		})
+	}
+}
+
 func TestValidateOpenAPI(t *testing.T) {
 	testCases := []struct {
 		name    string