diff --git a/src/main/services/team/opencode/bridge/OpenCodeBridgeCommandContract.ts b/src/main/services/team/opencode/bridge/OpenCodeBridgeCommandContract.ts
index 9a478e01..f941cc6d 100644
--- a/src/main/services/team/opencode/bridge/OpenCodeBridgeCommandContract.ts
+++ b/src/main/services/team/opencode/bridge/OpenCodeBridgeCommandContract.ts
@@ -1,6 +1,7 @@
 import { createHash } from 'crypto';
 
 export const OPEN_CODE_BRIDGE_SCHEMA_VERSION = 1 as const;
+export const OPEN_CODE_TASK_LEDGER_EVIDENCE_CONTRACT_VERSION = 1 as const;
 
 export type OpenCodeBridgeCommandName =
   | 'opencode.handshake'
@@ -259,6 +260,7 @@ export type OpenCodeBackfillTaskLedgerOutcome =
 export interface OpenCodeBackfillTaskLedgerCommandData {
   schemaVersion: 1;
   providerId: 'opencode';
+  opencodeTaskLedgerEvidenceContractVersion?: number;
   teamName: string;
   taskId?: string;
   projectDir?: string;
@@ -362,6 +364,7 @@ export interface OpenCodeBridgePeerIdentity {
     minVersion: number;
     currentVersion: number;
     supportedCommands: OpenCodeBridgeCommandName[];
+    opencodeTaskLedgerEvidenceContractVersion?: number;
   };
   runtime: {
     providerId: 'opencode';
@@ -846,7 +849,10 @@ function isPeerIdentity(value: unknown): value is OpenCodeBridgePeerIdentity {
     (bridgeProtocol.minVersion as number) < 1 ||
     (bridgeProtocol.currentVersion as number) < (bridgeProtocol.minVersion as number) ||
     !Array.isArray(bridgeProtocol.supportedCommands) ||
-    !bridgeProtocol.supportedCommands.every(isOpenCodeBridgeCommandName)
+    !bridgeProtocol.supportedCommands.every(isOpenCodeBridgeCommandName) ||
+    (bridgeProtocol.opencodeTaskLedgerEvidenceContractVersion !== undefined &&
+      (!Number.isInteger(bridgeProtocol.opencodeTaskLedgerEvidenceContractVersion) ||
+        (bridgeProtocol.opencodeTaskLedgerEvidenceContractVersion as number) < 1))
   ) {
     return false;
   }
diff --git a/test/main/services/team/OpenCodeBridgeCommandContract.test.ts b/test/main/services/team/OpenCodeBridgeCommandContract.test.ts
index 48c5051c..7be4e603 100644
--- a/test/main/services/team/OpenCodeBridgeCommandContract.test.ts
+++ b/test/main/services/team/OpenCodeBridgeCommandContract.test.ts
@@ -6,6 +6,7 @@ import {
   createOpenCodeBridgeHandshakeIdentityHash,
   createOpenCodeBridgeIdempotencyKey,
   isOpenCodeBridgeCommandName,
+  OPEN_CODE_TASK_LEDGER_EVIDENCE_CONTRACT_VERSION,
   parseSingleBridgeJsonResult,
   stableHash,
   validateBridgeResultEnvelope,
@@ -202,6 +203,42 @@ describe('OpenCodeBridgeCommandContract', () => {
     });
   });
 
+  it('accepts handshake evidence contract version and rejects invalid values', () => {
+    const client = peerIdentity('claude_team');
+    const server = peerIdentity('agent_teams_orchestrator');
+    server.bridgeProtocol.opencodeTaskLedgerEvidenceContractVersion =
+      OPEN_CODE_TASK_LEDGER_EVIDENCE_CONTRACT_VERSION;
+    const validHandshake = buildHandshake({ client, server });
+
+    expect(
+      validateOpenCodeBridgeHandshake({
+        handshake: validHandshake,
+        expectedClient: client,
+        requiredCommand: 'opencode.launchTeam',
+        expectedCapabilitySnapshotId: 'cap-1',
+        expectedManifestHighWatermark: 10,
+        expectedRunId: 'run-1',
+      })
+    ).toEqual({ ok: true });
+
+    server.bridgeProtocol.opencodeTaskLedgerEvidenceContractVersion = 0;
+    const invalidHandshake = buildHandshake({ client, server });
+
+    expect(
+      validateOpenCodeBridgeHandshake({
+        handshake: invalidHandshake,
+        expectedClient: client,
+        requiredCommand: 'opencode.launchTeam',
+        expectedCapabilitySnapshotId: 'cap-1',
+        expectedManifestHighWatermark: 10,
+        expectedRunId: 'run-1',
+      })
+    ).toEqual({
+      ok: false,
+      reason: 'Bridge handshake peer identity is invalid',
+    });
+  });
+
   it('creates deterministic idempotency keys for equivalent JSON bodies', () => {
     const first = createOpenCodeBridgeIdempotencyKey({
       command: 'opencode.launchTeam',