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Fixes #1

Author: thekid

ChangeLog.md

@@ -3,6 +3,14 @@ Model Context Protocol change log
 
 ## ?.?.? / ????-??-??
 
+## 0.2.0 / 2025-07-29
+
+* Fixed issue #1: Standard I/O default line limit (8192 bytes) exceeded
+  (@thekid)
+* Renamed *first()* -> *value()* to more accurately match what is being
+  returned
+  (@thekid)
+
 ## 0.1.0 / 2025-06-14
 
 * Hello World! First release - @thekid

src/main/php/io/modelcontextprotocol/StdIo.class.php

@@ -10,6 +10,7 @@
 class StdIo extends Transport {
   private $process;
   private $cat= null;
+  private $buffer= '';
 
   /**
    * Creates a new transport instance
@@ -66,13 +67,18 @@ public function notify($method) {
   public function call($method, $params= null) {
     $this->send(['id' => uniqid(), 'method' => $method, 'params' => $params ?: (object)[]]);
 
-    $response= $this->process->out->readLine();
-    $this->cat && $this->cat->debug('<<<', $response);
-    if (false === $response) {
-      $this->process->close();
-      throw new CallFailed(-1, 'Unexpected EOF from process');
+    while (false === ($p= strpos($this->buffer, "\n"))) {
+      if (false === ($chunk= $this->process->out->read())) {
+        $this->process->close();
+        throw new CallFailed(-1, 'Unexpected EOF from process');
+      }
+      $this->buffer.= $chunk;
     }
 
+    $response= substr($this->buffer, 0, $p);
+    $this->buffer= substr($this->buffer, $p);
+    $this->cat && $this->cat->debug('<<<', $response);
+
     return Result::from(json_decode($response, true));
   }
 

src/test/php/io/modelcontextprotocol/unittest/StdIoTest.class.php

@@ -15,6 +15,16 @@ public function call() {
     Assert::equals($value, $fixture->call('test')->value());
   }
 
+  #[Test, Values([8192, 65536, 1048576])]
+  public function call_with_output_of_size($size) {
+    $fixture= new StdIo(new Process(PHP_BINARY, [
+      '-r',
+      "echo json_encode(['jsonrpc' => '2.0', 'id' => '6100', 'result' => str_repeat('*', {$size})]), PHP_EOL;"
+    ]));
+
+    Assert::equals($size, strlen($fixture->call('test')->value()));
+  }
+
   #[Test, Expect(class: CallFailed::class, message: '#-1: Unexpected EOF from process')]
   public function unexpected_eof() {
     (new StdIo(new Process(PHP_BINARY, ['-r', "exit(0);"])))->call('test');