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+Post a `@holdex pr submit-time` comment on a pull request to record time spent.
+
+## Input
+
+Time is provided as `$ARGUMENTS` (e.g. `2h30m`, `1h`, `45m`, `1.5h`).
+
+If `$ARGUMENTS` is empty, ask the user for the time before proceeding.
+
+Validate the format — accepted patterns: `15m`, `1h`, `2h30m`, `1.5h`. If the format is invalid, tell the user and stop.
+
+## Resolve the PR
+
+Detect the current PR from the git worktree:
+
+```bash
+gh pr list --head "$(git branch --show-current)" --json number,url,title --limit 1
+```
+
+If no PR is found for the current branch, ask the user for the PR number or URL.
+
+## Post the comment
+
+```bash
+gh pr comment <PR_URL> --body "@holdex pr submit-time $ARGUMENTS"
+```
+
+Confirm the comment was posted and show the PR URL.