diff --git a/web4-standard/implementation/sdk/web4/errors.py b/web4-standard/implementation/sdk/web4/errors.py
index e5988e7..0c5d8da 100644
--- a/web4-standard/implementation/sdk/web4/errors.py
+++ b/web4-standard/implementation/sdk/web4/errors.py
@@ -297,6 +297,49 @@ class ErrorMeta:
         400,
         "Protocol downgrade attack detected",
     ),
+    # mcp-protocol.md §7.6 — Cross-Society MCP Errors
+    ErrorCode.CROSS_SOCIETY_UNRECOGNIZED_LCT: ErrorMeta(
+        ErrorCode.CROSS_SOCIETY_UNRECOGNIZED_LCT,
+        ErrorCategory.CROSS_SOCIETY,
+        "Unrecognized Cross-Society LCT",
+        404,
+        "Responding society does not recognize the caller's LCT",
+    ),
+    ErrorCode.CROSS_SOCIETY_EXCHANGE_INVALID: ErrorMeta(
+        ErrorCode.CROSS_SOCIETY_EXCHANGE_INVALID,
+        ErrorCategory.CROSS_SOCIETY,
+        "Invalid Exchange Rate",
+        400,
+        "Cross-society ATP exchange rate is invalid or expired",
+    ),
+    ErrorCode.CROSS_SOCIETY_LAW_CONFLICT: ErrorMeta(
+        ErrorCode.CROSS_SOCIETY_LAW_CONFLICT,
+        ErrorCategory.CROSS_SOCIETY,
+        "Law Oracle Conflict",
+        409,
+        "Sender and responding societies have conflicting law oracles",
+    ),
+    ErrorCode.CROSS_SOCIETY_WITNESS_REQUIRED: ErrorMeta(
+        ErrorCode.CROSS_SOCIETY_WITNESS_REQUIRED,
+        ErrorCategory.CROSS_SOCIETY,
+        "Witness Required",
+        403,
+        "Cross-society action requires a witness but none is available",
+    ),
+    ErrorCode.R7_REPUTATION_INVALID: ErrorMeta(
+        ErrorCode.R7_REPUTATION_INVALID,
+        ErrorCategory.CROSS_SOCIETY,
+        "Invalid R7 Reputation",
+        400,
+        "R7 reputation envelope is malformed or signature invalid",
+    ),
+    ErrorCode.PROPAGATION_SCOPE_UNSUPPORTED: ErrorMeta(
+        ErrorCode.PROPAGATION_SCOPE_UNSUPPORTED,
+        ErrorCategory.CROSS_SOCIETY,
+        "Unsupported Propagation Scope",
+        400,
+        "Responding society does not support the requested propagation scope",
+    ),
 }
 
 
@@ -415,6 +458,12 @@ class ProtoError(Web4Error):
     pass
 
 
+class CrossSocietyError(Web4Error):
+    """Error related to cross-society MCP operations (mcp-protocol.md §7.6)."""
+
+    pass
+
+
 # Map categories to their subclass for from_problem_json dispatch
 _CATEGORY_SUBCLASS: Dict[ErrorCategory, type[Web4Error]] = {
     ErrorCategory.BINDING: BindingError,
@@ -423,6 +472,7 @@ class ProtoError(Web4Error):
     ErrorCategory.AUTHZ: AuthzError,
     ErrorCategory.CRYPTO: CryptoError,
     ErrorCategory.PROTO: ProtoError,
+    ErrorCategory.CROSS_SOCIETY: CrossSocietyError,
 }
 
 
diff --git a/web4-standard/testing/conformance/atp-operations.json b/web4-standard/testing/conformance/atp-operations.json
index 31cbd90..6df5453 100644
--- a/web4-standard/testing/conformance/atp-operations.json
+++ b/web4-standard/testing/conformance/atp-operations.json
@@ -2,6 +2,12 @@
   "$schema": "https://web4.io/schemas/test-vectors/v1.json",
   "suite": "ATP/ADP Operations",
   "version": "0.1.0",
+  "provenance": {
+    "authored_against_sdk_version": "0.27.0",
+    "shape_source_commit": "759eaefa",
+    "shapes": ["ATPAccount"],
+    "last_freshness_review": "2026-05-16"
+  },
   "description": "Conformance test vectors for ATP/ADP economy operations. Conservation invariant MUST hold across all operations.",
 
   "account_vectors": [
diff --git a/web4-standard/testing/conformance/r6-r7-actions.json b/web4-standard/testing/conformance/r6-r7-actions.json
index 35b6a44..97f898a 100644
--- a/web4-standard/testing/conformance/r6-r7-actions.json
+++ b/web4-standard/testing/conformance/r6-r7-actions.json
@@ -2,6 +2,12 @@
   "$schema": "https://web4.io/schemas/test-vectors/v1.json",
   "suite": "R6/R7 Action Framework",
   "version": "0.1.0",
+  "provenance": {
+    "authored_against_sdk_version": "0.27.0",
+    "shape_source_commit": "d155b6a6",
+    "shapes": ["R7Action", "Rules", "Role", "Constraint", "Request", "ResourceRequirements", "Reference", "WitnessAttestation"],
+    "last_freshness_review": "2026-05-16"
+  },
   "description": "Conformance test vectors for R6 (Rules/Role/Request/Reference/Resource→Result) and R7 (+Reputation) action framework.",
 
   "validation_vectors": [
diff --git a/web4-standard/testing/conformance/society-roles.json b/web4-standard/testing/conformance/society-roles.json
index a3960b5..bd67d97 100644
--- a/web4-standard/testing/conformance/society-roles.json
+++ b/web4-standard/testing/conformance/society-roles.json
@@ -2,6 +2,12 @@
   "$schema": "https://web4.io/schemas/test-vectors/v1.json",
   "suite": "Society & Role Operations",
   "version": "0.1.0",
+  "provenance": {
+    "authored_against_sdk_version": "0.27.0",
+    "shape_source_commit": "d155b6a6",
+    "shapes": ["RoleAssignment", "SocietyRole", "SocietyPhase"],
+    "last_freshness_review": "2026-05-16"
+  },
   "description": "Conformance test vectors for Web4 society lifecycle and role management.",
 
   "bootstrap_vectors": [
diff --git a/web4-standard/testing/conformance/tensor-operations.json b/web4-standard/testing/conformance/tensor-operations.json
index 32befcb..ce84f32 100644
--- a/web4-standard/testing/conformance/tensor-operations.json
+++ b/web4-standard/testing/conformance/tensor-operations.json
@@ -2,6 +2,12 @@
   "$schema": "https://web4.io/schemas/test-vectors/v1.json",
   "suite": "T3/V3 Tensor Operations",
   "version": "0.1.0",
+  "provenance": {
+    "authored_against_sdk_version": "0.27.0",
+    "shape_source_commit": "759eaefa",
+    "shapes": ["T3", "V3"],
+    "last_freshness_review": "2026-05-16"
+  },
   "description": "Conformance test vectors for T3 (Trust) and V3 (Value) tensor operations. Any compliant implementation MUST produce identical results for these inputs.",
 
   "t3_vectors": [