Preflight Checklist
What's Wrong?
When running the /karpathy-guidelines slash command in the VS Code extension, the command loads successfully and Claude begins responding, but the session then crashes with API Error: Content block not found. Additionally, Claude incorrectly enters Plan Mode despite the user explicitly requesting not to.
This is reproducible across multiple attempts, including after Developer: Reload Window and /clear.
What Should Happen?
The slash command should apply behavioral guidelines without breaking the session
Claude should continue to execute the user's task normally after the skill is loaded
Claude should respect the user's explicit instruction to not enter Plan Mode
No Content block not found error should occur during normal task execution
Error Messages/Logs
API Error: Content block not found
Partial output before failure:
Got it — I'll follow those guidelines: surface assumptions, keep changes minimal,
stay surgical, and define verifiable success criteria before implementing.
EnterPlanMode
Entered plan mode. You should now focus on exploring the codebase...
我先确认项目结构和现有模式，再给你一个可执行的最小实现方案。
API Error: Content block not found
Steps to Reproduce
1 Open Claude Code in VS Code extension
2 Run /karpathy-guidelines
3 Send a task prompt:
用 TypeScript 实现一个用户注册功能，要求支持邮箱验证。
请严格遵循 Karpathy guidelines。请不要进入 Plan Mode，直接正常思考并实现。
4 Claude starts responding, loads the skill, begins task execution
5 Session crashes with API Error: Content block not found
Note: Tested with Developer: Reload Window and /clear before retrying — issue persists.
Claude Model
Other
Is this a regression?
No, this never worked
Last Working Version
No response
Claude Code Version
2.1.100 && 2.1.132
Platform
Other
Operating System
Windows
Terminal/Shell
VS Code integrated terminal
Additional Information
No response
Preflight Checklist
What's Wrong?
When running the /karpathy-guidelines slash command in the VS Code extension, the command loads successfully and Claude begins responding, but the session then crashes with API Error: Content block not found. Additionally, Claude incorrectly enters Plan Mode despite the user explicitly requesting not to.
This is reproducible across multiple attempts, including after Developer: Reload Window and /clear.
What Should Happen?
The slash command should apply behavioral guidelines without breaking the session
Claude should continue to execute the user's task normally after the skill is loaded
Claude should respect the user's explicit instruction to not enter Plan Mode
No Content block not found error should occur during normal task execution
Error Messages/Logs
Steps to Reproduce
1 Open Claude Code in VS Code extension
2 Run /karpathy-guidelines
3 Send a task prompt:
用 TypeScript 实现一个用户注册功能，要求支持邮箱验证。
请严格遵循 Karpathy guidelines。请不要进入 Plan Mode，直接正常思考并实现。
4 Claude starts responding, loads the skill, begins task execution
5 Session crashes with API Error: Content block not found
Note: Tested with Developer: Reload Window and /clear before retrying — issue persists.
Claude Model
Other
Is this a regression?
No, this never worked
Last Working Version
No response
Claude Code Version
2.1.100 && 2.1.132
Platform
Other
Operating System
Windows
Terminal/Shell
VS Code integrated terminal
Additional Information
No response