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

Question

JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ OP

Created 4d

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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:

Open a new chat in Xcode's Coding Assistant
Select "Claude Agent" from the agent dropdown (instead of "Claude Sonnet 4.5")
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.

Screenshot 2026-02-21 at 01.31.11.png

Screenshot 2026-02-21 at 01.48.27.png

Screenshot 2026-02-21 at 01.32.43.png

Screenshot 2026-02-21 at 01.33.11.png

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Answer 1

Developer Tools Engineer OP

Apple

11h

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!

0