diff --git a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponse.java b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponse.java
index c2af373a334..ba3f7360c5c 100644
--- a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponse.java
+++ b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponse.java
@@ -46,7 +46,7 @@ public class ErrorResponse extends Response {
     protected String toStringBody() {
         return "request=[" + requestType
                 + "] message=[" + message
-                + "] cuase=[" + cause
+                + "] cause=[" + cause
                 + "] stack=[" + stack + "]";
     }
 
diff --git a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponse.java b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponse.java
index 2efa227d0c1..be1fef71f94 100644
--- a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponse.java
+++ b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponse.java
@@ -43,7 +43,7 @@ public class ExceptionResponse extends Response {
     protected String toStringBody() {
         return "request=[" + requestType
                 + "] message=[" + message
-                + "] cuase=[" + cause + "]";
+                + "] cause=[" + cause + "]";
     }
 
     @Override
diff --git a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponse.java b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponse.java
index 33606dc020b..ed49bb79768 100644
--- a/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponse.java
+++ b/sql/cli-proto/src/main/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponse.java
@@ -59,7 +59,7 @@ public class InfoResponse extends Response {
                 + "]/[major=[" + majorVersion
                 + "] minor=[" + minorVersion
                 + "] hash=[" + versionHash
-                + "] date=[" + versionDate + "]";
+                + "] date=[" + versionDate + "]]";
     }
 
     @Override
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandRequestTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandRequestTests.java
index 31578ac0155..f61cca083d1 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandRequestTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandRequestTests.java
@@ -19,4 +19,8 @@ public class CommandRequestTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomCommandRequest());
     }
+
+    public void testToString() {
+        assertEquals("CommandRequest<test>", new CommandRequest("test").toString());
+    }
 }
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandResponseTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandResponseTests.java
index 12ccf77a6ca..4abaa6c017f 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandResponseTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/CommandResponseTests.java
@@ -20,4 +20,9 @@ public class CommandResponseTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomCommandResponse());
     }
+
+    public void testToString() {
+        assertEquals("CommandResponse<received=[123] sent=[332] requestId=[rid] data=[test]>",
+                new CommandResponse(123, 332, "rid", "test").toString());
+    }
 }
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponseTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponseTests.java
index 2496ed204de..a53276435cd 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponseTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ErrorResponseTests.java
@@ -20,4 +20,9 @@ public class ErrorResponseTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomErrorResponse());
     }
+
+    public void testToString() {
+        assertEquals("ErrorResponse<request=[COMMAND] message=[test] cause=[test] stack=[stack\nstack]>",
+                new ErrorResponse(RequestType.COMMAND, "test", "test", "stack\nstack").toString());
+    }
 }
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponseTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponseTests.java
index 4fe17213a0e..aae9f6b93e9 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponseTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/ExceptionResponseTests.java
@@ -20,4 +20,9 @@ public class ExceptionResponseTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomExceptionResponse());
     }
+
+    public void testToString() {
+        assertEquals("ExceptionResponse<request=[COMMAND] message=[test] cause=[test]>",
+                new ExceptionResponse(RequestType.COMMAND, "test", "test").toString());
+    }
 }
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoRequestTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoRequestTests.java
index c79e25ff402..d0b035b1ccf 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoRequestTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoRequestTests.java
@@ -20,4 +20,9 @@ public class InfoRequestTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomInfoRequest());
     }
+
+    public void testToString() {
+        assertEquals("InfoRequest<jvm=[version=[1.8.0_131] vendor=[testvendor] classPath=[testcp]] os=[name=[Mac OS X] version=[10.12.5]]>",
+                new InfoRequest("1.8.0_131", "testvendor", "testcp", "Mac OS X", "10.12.5").toString());
+    }
 }
diff --git a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponseTests.java b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponseTests.java
index 4a4237ecb56..7c535b4a4ae 100644
--- a/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponseTests.java
+++ b/sql/cli-proto/src/test/java/org/elasticsearch/xpack/sql/cli/net/protocol/InfoResponseTests.java
@@ -20,4 +20,9 @@ public class InfoResponseTests extends ESTestCase {
     public void testRoundTrip() throws IOException {
         assertRoundTripCurrentVersion(randomInfoResponse());
     }
+
+    public void testToString() {
+        assertEquals("InfoResponse<node=[adsf] cluster=[test_cluster] version=[6.0.0]/[major=[6] minor=[0] hash=[feed] date=[date]]>",
+                new InfoResponse("adsf", "test_cluster", (byte) 6, (byte) 0, "6.0.0", "feed", "date").toString());
+    }
 }