Error / Message
Custom slash command not found
Claude Code can't find a custom command you expected to exist — almost always a file location or naming issue.
Custom commands are markdown files in .claude/commands/ (project-level) or the equivalent user-level directory, and the command name comes directly from the filename — /diff-review maps to diff-review.md, for example. The most common cause of a missing command is simply the file being in the wrong directory, or a typo between the filename and the slash command being typed.
It's worth double-checking the file actually has content Claude Code recognizes as a command definition (a description and instructions), not just an empty or malformed file.
This is exactly the format the toolkit's own command pack uses — dropping its .md files straight into .claude/commands/ is meant to make this a non-issue for the commands it includes.
Confirm the file is at .claude/commands/<name>.mdFrequently asked questions
What does "Custom slash command not found" mean in Claude Code?
Claude Code can't find a custom command you expected to exist — almost always a file location or naming issue.
How do I fix it?
Try: Confirm the file is at .claude/commands/<name>.md
Is this something to worry about?
This is exactly the format the toolkit's own command pack uses — dropping its .md files straight into .claude/commands/ is meant to make this a non-issue for the commands it includes.
Is this covered in OG Flow Code Premium Toolkit?
Yes — Custom slash command not found and patterns like it are covered by the commands, and in higher tiers the specialist agents and guided skills, in OG Flow Code Premium Toolkit. Tiers start at $19.90.
Want the full command, hook, and template pack?
This is one pattern from the OG Flow Code toolkit. Choose the tier that fits your workflow, including Multi-Stack for six additional language stacks.
See pricing — from $19.90 once