StandaloneCoroutine was cancelled

[StephenW-Cober]

Laravel Package Version

1.0.16

Laravel Version

12.24.0

PHP Version

8.3.23

System Info

Windows 11 Pro, PhpStorm 2025.2

Description

Hey, I am still seeing the issue I mentioned in #48 with the "StandaloneCoroutine was cancelled" error for PhpStorm and Junie.

I do not have this problem when adding the MCP server to Jetbrains AI and it works great! Its only Junie that complains.

My Laravel logs have the following in them

    "exception": {
        "class": "ErrorException",
        "message": "fwrite(): Write of 124 bytes failed with errno=22 Invalid argument",
        "code": 0,
        "file": "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server\\Transport\\StdioTransport.php:46",
        "trace": [
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Bootstrap\\HandleExceptions.php:258",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server\\Transport\\StdioTransport.php:46",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server.php:187",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server.php:139",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server\\Transport\\StdioTransport.php:63",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server\\Registrar.php:110",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Server\\Registrar.php:40",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\mcp\\src\\Console\\Commands\\StartServerCommand.php:32",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:36",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\Util.php:43",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:96",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:35",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\Container.php:835",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Console\\Command.php:211",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Command\\Command.php:318",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Console\\Command.php:180",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:1092",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:341",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:192",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Console\\Application.php:165",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Console\\Kernel.php:426",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Support\\Facades\\Facade.php:363",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\boost\\src\\Console\\StartCommand.php:16",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:36",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\Util.php:43",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:96",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\BoundMethod.php:35",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Container\\Container.php:835",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Console\\Command.php:211",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Command\\Command.php:318",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Console\\Command.php:180",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:1092",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:341",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\symfony\\console\\Application.php:192",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Console\\Kernel.php:197",
            "C:\\Users\\User\\Documents\\Git\\project\\src\\artisan:34"
        ]
    }
}

Lastly here are some entries from idea.log

JSON input: 
kotlinx.serialization.json.internal.JsonDecodingException: Cannot read Json element because of unexpected end of the input at path: $
JSON input: 
	at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:24)
	at kotlinx.serialization.json.internal.JsonExceptionsKt.JsonDecodingException(JsonExceptions.kt:32)
	at kotlinx.serialization.json.internal.AbstractJsonLexer.fail(AbstractJsonLexer.kt:587)
	at kotlinx.serialization.json.internal.AbstractJsonLexer.fail$default(AbstractJsonLexer.kt:585)
	at kotlinx.serialization.json.internal.JsonTreeReader.read(JsonTreeReader.kt:107)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeJsonElement(StreamingJsonDecoder.kt:50)
	at kotlinx.serialization.json.JsonContentPolymorphicSerializer.deserialize(JsonContentPolymorphicSerializer.kt:90)
	at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
	at kotlinx.serialization.json.Json.decodeFromString(Json.kt:149)
	at io.modelcontextprotocol.kotlin.sdk.shared.ReadBufferKt.deserializeMessage(ReadBuffer.kt:58)
	at io.modelcontextprotocol.kotlin.sdk.shared.ReadBuffer.readMessage(ReadBuffer.kt:41)
	at io.modelcontextprotocol.kotlin.sdk.client.StdioClientTransport.processReadBuffer(StdioClientTransport.kt:120)
	at io.modelcontextprotocol.kotlin.sdk.client.StdioClientTransport.access$processReadBuffer(StdioClientTransport.kt:30)
	at io.modelcontextprotocol.kotlin.sdk.client.StdioClientTransport$start$3$readJob$1.invokeSuspend(StdioClientTransport.kt:64)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.internal.SoftLimitedDispatcher$Worker.run(SoftLimitedDispatcher.kt:130)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:613)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1183)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:778)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:765)
2025-08-14 13:07:14,825 [  55774]   WARN - #c.i.m.l.m.e.c.m.McpClient - Failed to connect to mcp server McpServerConfigId(name=laravel-boost, sourcePath=C:\Users\User\Documents\Git\project\src\.junie\mcp\mcp.json): StandaloneCoroutine was cancelled
java.lang.Throwable: Control-flow exceptions (e.g. this class kotlinx.coroutines.JobCancellationException) should never be logged. Instead, these should have been rethrown if caught.
	at com.intellij.openapi.diagnostic.Logger.ensureNotControlFlow(Logger.java:504)
	at com.intellij.idea.IdeaLogger.warn(IdeaLogger.java:139)
	at com.intellij.ml.llm.matterhorn.ej.core.mcp.McpClient$start$2.invokeSuspend(McpClient.kt:104)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
	at kotlinx.coroutines.internal.SoftLimitedDispatcher$Worker.run(SoftLimitedDispatcher.kt:130)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:613)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1183)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:778)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:765)
Caused by: kotlinx.coroutines.JobCancellationException: StandaloneCoroutine was cancelled; job=StandaloneCoroutine{Cancelled}@513c513e

I don't see anything particularly obvious here unfortunately.

Steps To Reproduce

Unfortunately I'm not exactly sure what would reproduce it. Possible its an issue with my specific project since its been upgraded from a Laravel 5.6 install. A new Laravel 12 app works just fine. I am not using Herd, Sail, or Docker with WSL2 for development.

[cord]

@ashleyhindle 1.0.17 resolves the path to php:

"command": "/Users/cord/Library/Application Support/Herd/bin/php83"

but still the the junie integration fails with:

local.ERROR: fwrite(): Write of 120 bytes failed with errno=32 Broken pipe {"exception":"[object] (ErrorException(code: 0): fwrite(): Write of 120 bytes failed with errno=32 Broken pipe at /Users/Shared/Projects/myApp/vendor/laravel/mcp/src/Server/Transport/StdioTransport.php:46)

so the call to php seems to work, but something else breaks.

[ashleyhindle]

Very peculiar 🤔

What happens when you run: php artisan boost:mcp yourself @cord @StephenW-Cober ?
If it's working well it should simply run with no output 😁 If that happens, paste in {"jsonrpc":"2.0","id":456,"method":"initialize","params":[]} and press enter and you should get a JSON RPC response. If that happens, then we know at least Boost is good in general 👌

[seanwash]

Throwing my experience in here – I'm on mac os 15.5 & phpstorm 2025.2, running into the same issue.

What happens when you run: php artisan boost:mcp yourself

It runs without any output as you said it should. Here's the input & response:

{"jsonrpc":"2.0","id":456,"method":"initialize","params":[]}
{"jsonrpc":"2.0","id":456,"result":{"protocolVersion":"2025-06-18","capabilities":{"tools":{"listChanged":false},"resources":{"listChanged":false},"prompts":{"listChanged":false}},"serverInfo":{"name":"Laravel Boost","version":"0.0.1"},"instructions":"Laravel ecosystem MCP server offering database schema access, Artisan commands, error logs, Tinker execution, semantic documentation search and more. Boost helps with code generation."}}

[StephenW-Cober]

{"jsonrpc":"2.0","id":456,"result":{"protocolVersion":"2025-06-18","capabilities":{"tools":{"listChanged":false},"resources":{"listChanged":false},"prompts":{"listChanged":false}},"serverInfo":{"name":"Laravel Boost","version":"0.0.1"},"instructions":"Laravel ecosystem MCP server offering database schema access, Artisan commands, error logs, Tinker execution, semantic documentation search and more. Boost helps with code generation."}}

Running php artisan boost:mcp does result in no output and pasting the requested JSON returns that which looks good to me! I have used Boost within the Jetbrains AI Assistant and it seems to be working well there just not with Junie for some reason. Possibly some bug within Junie?