From 8dbcf92a0d125050988474f258df3e55c538efec Mon Sep 17 00:00:00 2001
From: reasv <7143787+reasv@users.noreply.github.com>
Date: Mon, 20 Apr 2026 02:13:20 +0200
Subject: [PATCH] fix(server): prevent probeClaudeCapabilities from wasting API
 requests (#2192)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
---
 .../src/provider/Layers/ClaudeProvider.ts     | 26 +++++++++++++++----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/apps/server/src/provider/Layers/ClaudeProvider.ts b/apps/server/src/provider/Layers/ClaudeProvider.ts
index 5274f84285bf22ad5fdeec776bdf00e54e713511..7c8a4c27a6e2316687d27a16a1c59fe00bced542 100644
--- a/apps/server/src/provider/Layers/ClaudeProvider.ts
+++ b/apps/server/src/provider/Layers/ClaudeProvider.ts
@@ -14,6 +14,7 @@ import { decodeJsonResult } from "@t3tools/shared/schemaJson";
 import {
   query as claudeQuery,
   type SlashCommand as ClaudeSlashCommand,
+  type SDKUserMessage,
 } from "@anthropic-ai/claude-agent-sdk";
 
 import {
@@ -480,13 +481,24 @@ function dedupeSlashCommands(
   return [...commandsByName.values()];
 }
 
+function waitForAbortSignal(signal: AbortSignal): Promise<void> {
+  if (signal.aborted) {
+    return Promise.resolve();
+  }
+  return new Promise((resolve) => {
+    signal.addEventListener("abort", () => resolve(), { once: true });
+  });
+}
+
 /**
  * Probe account information by spawning a lightweight Claude Agent SDK
  * session and reading the initialization result.
  *
- * The prompt is never sent to the Anthropic API — we abort immediately
- * after the local initialization phase completes. This gives us the
- * user's subscription type without incurring any token cost.
+ * We pass a never-yielding AsyncIterable as the prompt so that no user
+ * message is ever written to the subprocess stdin. This means the Claude
+ * Code subprocess completes its local initialization IPC (returning
+ * account info and slash commands) but never starts an API request to
+ * Anthropic. We read the init data and then abort the subprocess.
  *
  * This is used as a fallback when `claude auth status` does not include
  * subscription type information.
@@ -495,12 +507,16 @@ const probeClaudeCapabilities = (binaryPath: string) => {
   const abort = new AbortController();
   return Effect.tryPromise(async () => {
     const q = claudeQuery({
-      prompt: ".",
+      // Never yield — we only need initialization data, not a conversation.
+      // This prevents any prompt from reaching the Anthropic API.
+      // oxlint-disable-next-line require-yield
+      prompt: (async function* (): AsyncGenerator<SDKUserMessage> {
+        await waitForAbortSignal(abort.signal);
+      })(),
       options: {
         persistSession: false,
         pathToClaudeCodeExecutable: binaryPath,
         abortController: abort,
-        maxTurns: 0,
         settingSources: ["user", "project", "local"],
         allowedTools: [],
         stderr: () => {},
-- 
2.54.0