Xcode 26.3 RC - Claude Agent returns "Your request couldn't be completed"

Developer Tools & Services Xcode
JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ OP
Created 2w
Replies 4
Boosts 0
Views 289
Participants 4

Environment:

  • Xcode 26.3 RC
  • macOS 26.3 (25D125) (Apple Silicon / arm64)

Setup:

  • Xcode > Settings > Intelligence > Claude Agent: Signed In (account status shows "Signed In")
  • Model: Default

Steps to reproduce:

  1. Open a new chat in Xcode's Coding Assistant
  2. Select "Claude Agent" from the agent dropdown (instead of "Claude Sonnet 4.5")
  3. Send any message (e.g. "HI")

Expected result: Claude Agent responds normally.

Actual result: The message is sent but immediately returns the error: "Your request couldn't be completed."

🚩I have an active Claude Code subscription with remaining usage. Running claude in Terminal works perfectly, confirming the subscription and quota are valid.

Replies  4
Boosts  0
Views  289
Participants  4
Developer Tools Engineer OP
Apple
1w

I'm adding the "Coding intelligence" tag to make sure the Xcode team sees this. That tag is the best way to get more visibility on Xcode + agentic coding related issues!

2
Boomer OP
1w

Try 'logging' in with your API key. Xcode : Settings : Intelligence : Providers : Anthropic after downloading the Claude Agent. I wasn't able to use my free account by signing in but it works (for now) when I entered my API key

0
Developer Tools Engineer OP
Apple
5d

Thanks for reaching out, it looks at the surface level like the agent is unable to be launched. Are there any crash reports for claude? If not, could you file a feedback request and attach the output (the archive) of the sysdiagnose command?

0
OP
Apple
2d

The "Prompt stream failed: Agent has been closed" error can occur when your project is in a macOS privacy-protected directory like ~/Desktop, ~/Documents, or ~/Downloads. macOS should prompt you to grant Claude access to these locations, but if the prompt doesn't appear or was previously denied, the agent can fail with this error.

Workaround: Move your project to a non-protected directory such as ~/src, then reopen it in Xcode.

0
Xcode 26.3 RC - Claude Agent returns "Your request couldn't be completed"
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