diff --git a/scripts/hooks/check-console-log.js b/scripts/hooks/check-console-log.js
index 3658dde67..f55a5ed1d 100755
--- a/scripts/hooks/check-console-log.js
+++ b/scripts/hooks/check-console-log.js
@@ -32,7 +32,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (data.length < MAX_STDIN) {
-    data += chunk;
+    const remaining = MAX_STDIN - data.length;
+    data += chunk.substring(0, remaining);
   }
 });
 
diff --git a/scripts/hooks/evaluate-session.js b/scripts/hooks/evaluate-session.js
index 5323dc043..3faa3891e 100644
--- a/scripts/hooks/evaluate-session.js
+++ b/scripts/hooks/evaluate-session.js
@@ -29,7 +29,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (stdinData.length < MAX_STDIN) {
-    stdinData += chunk;
+    const remaining = MAX_STDIN - stdinData.length;
+    stdinData += chunk.substring(0, remaining);
   }
 });
 
diff --git a/scripts/hooks/post-edit-console-warn.js b/scripts/hooks/post-edit-console-warn.js
index 76f1ee2da..17e642e2c 100644
--- a/scripts/hooks/post-edit-console-warn.js
+++ b/scripts/hooks/post-edit-console-warn.js
@@ -17,7 +17,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (data.length < MAX_STDIN) {
-    data += chunk;
+    const remaining = MAX_STDIN - data.length;
+    data += chunk.substring(0, remaining);
   }
 });
 
diff --git a/scripts/hooks/post-edit-format.js b/scripts/hooks/post-edit-format.js
index f3651b5cf..87b1adfb4 100644
--- a/scripts/hooks/post-edit-format.js
+++ b/scripts/hooks/post-edit-format.js
@@ -17,7 +17,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (data.length < MAX_STDIN) {
-    data += chunk;
+    const remaining = MAX_STDIN - data.length;
+    data += chunk.substring(0, remaining);
   }
 });
 
diff --git a/scripts/hooks/post-edit-typecheck.js b/scripts/hooks/post-edit-typecheck.js
index 814a33366..18f03b7d0 100644
--- a/scripts/hooks/post-edit-typecheck.js
+++ b/scripts/hooks/post-edit-typecheck.js
@@ -19,7 +19,8 @@ process.stdin.setEncoding("utf8");
 
 process.stdin.on("data", (chunk) => {
   if (data.length < MAX_STDIN) {
-    data += chunk;
+    const remaining = MAX_STDIN - data.length;
+    data += chunk.substring(0, remaining);
   }
 });
 
diff --git a/scripts/hooks/session-end.js b/scripts/hooks/session-end.js
index 59bad8d26..dd6355ca6 100644
--- a/scripts/hooks/session-end.js
+++ b/scripts/hooks/session-end.js
@@ -109,7 +109,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (stdinData.length < MAX_STDIN) {
-    stdinData += chunk;
+    const remaining = MAX_STDIN - stdinData.length;
+    stdinData += chunk.substring(0, remaining);
   }
 });