diff --git a/README.md b/README.md
index f5952a2..826208a 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Only contracts that genuinely cross a repository boundary:
 
 | Schema | Version | Consumers |
 | --- | --- | --- |
-| `aep-record` | `aep/v0.2` | wasmagent-js, wasmagent-proxy, trace-pipeline, wasmagent-train-replay, open-agent-audit |
+| `aep-record` | `aep/v0.3` | wasmagent-js, wasmagent-proxy, trace-pipeline, wasmagent-train-replay, open-agent-audit |
 | `constraint-ir` | `compliance/v1` | wasmagent-js, trace-pipeline |
 | `constraint-violation` | `compliance/v1` | wasmagent-js, trace-pipeline |
 | `repair-trace` | `compliance/v1` | wasmagent-js, trace-pipeline |
@@ -143,6 +143,7 @@ python3 -m wasmagent_protocol check --scan --root .
 Published to npm and PyPI from CI via OIDC trusted publishing on `v*` tags — no
 tokens stored. See [`docs/CONTRACT-CHANGE-PROCESS.md`](docs/CONTRACT-CHANGE-PROCESS.md).
 
+- **0.1.7** — `aep-record` unified to `aep/v0.3`: reconciles the wasmagent-js and trace-pipeline forks into one canonical record. Additive optional fields `user_id`, `subject_id`, `side_effect_class` (per-record) + `run_side_effect_class_max` (per-run) sharing one enum, `recording_mode`, `argument_drift`. `aep/v0.1`/`aep/v0.2` stay accepted; `signature` stays optional.
 - **0.1.6** — cross-repo schema-drift gate: `wasmagent-protocol check` CLI (npm + PyPI) and the reusable `.github/workflows/schema-drift.yml` workflow.
 - **0.1.5** — first successful npm OIDC publish (trusted publisher now registered on npmjs).
 - **0.1.4** — npm OIDC groundwork; trusted publisher was not yet saved on npmjs.
diff --git a/package.json b/package.json
index 02437f6..b3d1f19 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@wasmagent/protocol",
-  "version": "0.1.6",
+  "version": "0.1.7",
   "description": "Canonical JSON Schemas for the WasmAgent Agent Evidence Protocol (AEP) and compliance contracts. Single source of truth across the WasmAgent org.",
   "keywords": ["wasmagent", "aep", "agent-evidence-protocol", "json-schema", "compliance", "provenance"],
   "homepage": "https://github.com/WasmAgent/wasmagent-protocol#readme",
diff --git a/pyproject.toml b/pyproject.toml
index 5e40cbd..e7aa892 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "wasmagent-protocol"
-version = "0.1.6"
+version = "0.1.7"
 description = "Canonical JSON Schemas for the WasmAgent Agent Evidence Protocol (AEP) and compliance contracts. Single source of truth across the WasmAgent org."
 readme = "README.md"
 requires-python = ">=3.9"
diff --git a/schemas/aep/aep-record.schema.json b/schemas/aep/aep-record.schema.json
index 9706647..99f458d 100644
--- a/schemas/aep/aep-record.schema.json
+++ b/schemas/aep/aep-record.schema.json
@@ -6,7 +6,7 @@
   "type": "object",
   "required": ["schema_version", "run_id", "created_at_ms"],
   "properties": {
-    "schema_version": { "type": "string", "enum": ["aep/v0.1", "aep/v0.2"] },
+    "schema_version": { "type": "string", "enum": ["aep/v0.1", "aep/v0.2", "aep/v0.3"] },
     "run_id": { "type": "string" },
     "trace_id": { "type": "string" },
     "parent_trace_id": { "type": ["string", "null"] },
@@ -162,8 +162,44 @@
         "dependency_lock_digest": { "type": "string" }
       }
     },
+    "user_id": {
+      "type": "string",
+      "description": "Optional end-user / principal the run acted on behalf of (additive, aep/v0.3+)."
+    },
+    "subject_id": {
+      "type": "string",
+      "description": "Optional agent subject identity for the run (additive, aep/v0.3+)."
+    },
+    "side_effect_class": {
+      "type": "string",
+      "enum": ["read", "mutate-local", "mutate-external", "network-egress", "unknown"],
+      "description": "Per-record side-effect classification (additive, aep/v0.3+). Shares one vocabulary with run_side_effect_class_max; reconciles wasmagent-js and trace-pipeline forks."
+    },
+    "run_side_effect_class_max": {
+      "type": "string",
+      "enum": ["read", "mutate-local", "mutate-external", "network-egress", "unknown"],
+      "description": "Per-run aggregate: the highest side-effect class observed across the whole run (additive, aep/v0.3+). Shares the side_effect_class vocabulary."
+    },
+    "recording_mode": {
+      "type": "string",
+      "enum": ["full", "delta", "validation"],
+      "description": "How this run's evidence was captured (additive, aep/v0.3+)."
+    },
+    "argument_drift": {
+      "type": "object",
+      "description": "Detected drift between an action's declared arguments and the arguments used at runtime (additive, aep/v0.3+).",
+      "properties": {
+        "tool_name": { "type": "string" },
+        "declared_digest": { "type": "string" },
+        "actual_digest": { "type": "string" },
+        "diff_summary": { "type": "string" },
+        "drifted_args": { "type": "array", "items": { "type": "string" } }
+      },
+      "additionalProperties": true
+    },
     "signature": {
       "type": "object",
+      "description": "Optional tamper-evident signature. Stays OPTIONAL in aep/v0.3; tightening it to required is a breaking change (CONTRACT-CHANGE-PROCESS.md section 3) that needs an org RFC before it can land - do not silently add it to the 'required' array.",
       "required": ["alg", "key_id", "sig"],
       "properties": {
         "alg": { "type": "string" },
diff --git a/schemas/index.json b/schemas/index.json
index 8afcecb..2bc43b1 100644
--- a/schemas/index.json
+++ b/schemas/index.json
@@ -9,7 +9,7 @@
       "title": "AEPRecord",
       "path": "schemas/aep/aep-record.schema.json",
       "canonical_id": "https://wasmagent.dev/schemas/aep/aep-record.schema.json",
-      "version": "aep/v0.2",
+      "version": "aep/v0.3",
       "stability": "evolving",
       "owners": [
         "wasmagent-protocol"
diff --git a/tests/fixtures/invalid/aep-record/bad-argument-drift.json b/tests/fixtures/invalid/aep-record/bad-argument-drift.json
new file mode 100644
index 0000000..af9c595
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-argument-drift.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-argdrift",
+  "created_at_ms": 1737600000000,
+  "argument_drift": "drifted-args-should-be-an-object"
+}
diff --git a/tests/fixtures/invalid/aep-record/bad-recording-mode.json b/tests/fixtures/invalid/aep-record/bad-recording-mode.json
new file mode 100644
index 0000000..8c27416
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-recording-mode.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-mode",
+  "created_at_ms": 1737600000000,
+  "recording_mode": "partial"
+}
diff --git a/tests/fixtures/invalid/aep-record/bad-run-side-effect.json b/tests/fixtures/invalid/aep-record/bad-run-side-effect.json
new file mode 100644
index 0000000..0fffd36
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-run-side-effect.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-runsec",
+  "created_at_ms": 1737600000000,
+  "run_side_effect_class_max": "delete-everything"
+}
diff --git a/tests/fixtures/invalid/aep-record/bad-side-effect-class.json b/tests/fixtures/invalid/aep-record/bad-side-effect-class.json
new file mode 100644
index 0000000..057a5eb
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-side-effect-class.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-sec",
+  "created_at_ms": 1737600000000,
+  "side_effect_class": "rm-rf"
+}
diff --git a/tests/fixtures/invalid/aep-record/bad-subject-id.json b/tests/fixtures/invalid/aep-record/bad-subject-id.json
new file mode 100644
index 0000000..1508007
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-subject-id.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-sid",
+  "created_at_ms": 1737600000000,
+  "subject_id": false
+}
diff --git a/tests/fixtures/invalid/aep-record/bad-user-id.json b/tests/fixtures/invalid/aep-record/bad-user-id.json
new file mode 100644
index 0000000..13a685e
--- /dev/null
+++ b/tests/fixtures/invalid/aep-record/bad-user-id.json
@@ -0,0 +1,6 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-bad-uid",
+  "created_at_ms": 1737600000000,
+  "user_id": 12345
+}
diff --git a/tests/fixtures/valid/aep-record/v0.3-fields.json b/tests/fixtures/valid/aep-record/v0.3-fields.json
new file mode 100644
index 0000000..d7a9f4b
--- /dev/null
+++ b/tests/fixtures/valid/aep-record/v0.3-fields.json
@@ -0,0 +1,26 @@
+{
+  "schema_version": "aep/v0.3",
+  "run_id": "run-v03",
+  "trace_id": "trace-v03",
+  "created_at_ms": 1737600000000,
+  "user_id": "user-42",
+  "subject_id": "agent-subject-1",
+  "side_effect_class": "mutate-external",
+  "run_side_effect_class_max": "network-egress",
+  "recording_mode": "full",
+  "argument_drift": {
+    "tool_name": "write_file",
+    "declared_digest": "sha256:aaa",
+    "actual_digest": "sha256:bbb",
+    "diff_summary": "path argument rewritten by policy",
+    "drifted_args": ["path"]
+  },
+  "actions": [
+    {
+      "action_id": "a1",
+      "tool_name": "write_file",
+      "state_changing": true,
+      "timestamp_ms": 1737600000100
+    }
+  ]
+}