diff --git a/test/battery.test.ts b/test/battery.test.ts
index 063a5cb..44cb653 100644
--- a/test/battery.test.ts
+++ b/test/battery.test.ts
@@ -1,6 +1,11 @@
 import assert from "node:assert/strict";
 import { join } from "node:path";
 import test from "node:test";
+import {
+	parseProofRun,
+	PROOF_ARTIFACT_VERSION,
+	scoreProofRun,
+} from "@creative-int/evals/proof";
 import { createWebsTransport, type WebsTransport } from "../extensions/webs.ts";
 import {
 	createDeterministicWebsTransport,
@@ -16,11 +21,24 @@ test("emits a passing canonical ProofRun for the deterministic MCP journey", asy
 	});
 
 	assert.ok(result);
+	const proof = parseProofRun(JSON.parse(JSON.stringify(result.proof)));
+	assert.deepEqual(proof, result.proof);
 	assert.equal(result.pass, true);
 	assert.equal(result.gate.pass, true);
 	assert.equal(result.score.score, 1);
 	assert.deepEqual(result.score.blockers, []);
-	assert.equal(result.proof.artifactVersion, "creative-int.proof-run.v1");
+	// Keep the released v1 baseline compatible with the intentional v2 upgrade.
+	assert.ok(
+		["creative-int.proof-run.v1", "creative-int.proof-run.v2"].includes(
+			PROOF_ARTIFACT_VERSION,
+		),
+	);
+	assert.equal(proof.artifactVersion, PROOF_ARTIFACT_VERSION);
+	assert.equal(proof.proofClass, "deterministic-proof");
+	assert.equal(
+		proof.intent.userGoal,
+		"Prove the public agent-facing Webs MCP memory journey without skip-into-green.",
+	);
 	assert.equal(result.proof.packageVersions["@creative-int/evals"], "1.8.0");
 	assert.equal(result.proof.intent.agentRoute, "source-ingest");
 	assert.equal(result.proof.evidence.artifacts.length, 5);
@@ -40,6 +58,59 @@ test("emits a passing canonical ProofRun for the deterministic MCP journey", asy
 	);
 });
 
+test("rejects malformed serialized battery proof through the canonical parser", async () => {
+	const [result] = await runWebsBattery({
+		transport: createDeterministicWebsTransport(),
+	});
+	assert.ok(result);
+	const proof = result.proof;
+	const malformed = [
+		[
+			{ ...proof, artifactVersion: "creative-int.proof-run.v999" },
+			/artifactVersion/,
+		],
+		[{ ...proof, intent: undefined }, /intent/],
+		[
+			{ ...proof, intent: { ...proof.intent, userGoal: undefined } },
+			/userGoal/,
+		],
+		[
+			{ ...proof, intent: { ...proof.intent, agentRoute: "unknown" } },
+			/agentRoute/,
+		],
+		[{ ...proof, evidence: { artifacts: [{ kind: "unknown" }] } }, /kind/],
+	] as const;
+	for (const [input, error] of malformed) {
+		assert.throws(
+			() => parseProofRun(JSON.parse(JSON.stringify(input))),
+			error,
+		);
+	}
+});
+
+test("legacy v1 saved proof retains failed assertions and blockers when parsed", () => {
+	const legacy = {
+		artifactVersion: "creative-int.proof-run.v1",
+		intent: {
+			userGoal: "Verify a saved Webs MCP journey",
+			agentRoute: "source-ingest",
+		},
+		eval: {
+			assertions: [{ name: "MCP response", status: "fail" }],
+			blockers: ["MCP response unavailable"],
+		},
+	};
+	const proof = parseProofRun(JSON.parse(JSON.stringify(legacy)));
+	assert.equal(proof.artifactVersion, PROOF_ARTIFACT_VERSION);
+	assert.equal(proof.intent.userGoal, legacy.intent.userGoal);
+	assert.equal(proof.intent.agentRoute, legacy.intent.agentRoute);
+	assert.deepEqual(proof.eval.assertions, legacy.eval.assertions);
+	assert.deepEqual(proof.eval.blockers, legacy.eval.blockers);
+	const score = scoreProofRun(proof);
+	assert.ok(score.score < 1);
+	assert.ok(score.blockers.includes("MCP response unavailable"));
+});
+
 test("rejects zero-case battery runs instead of skipping into green", async () => {
 	await assert.rejects(
 		runWebsBattery({