[FEATURE] /fyi to inform Claude for its running job

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

User asks Claude Code to do something, and moments later (or minites later but before the task finished) the user realizes there's another piece of information that the user should have included in the task prompt.

Proposed Solution

/fyi for quick additions to the active Claude Code task.

(Like how /btw was implementated for quick questions without interrupting Claude's current work. But /fyi for intentionally now for affecting Claude's current work, by adding something to his context or request-prompt.)

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_