Add flag-based alternatives to the positional argument for `bd dep add`:
- `--blocked-by <id>`: Specify the blocking issue via flag
- `--depends-on <id>`: Alias for --blocked-by
This reduces token waste when Claude guesses flag-based syntax, which
is a common pattern. Previously, Claude would attempt commands like:
bd dep add issue-123 --blocked-by issue-456
This would fail with "unknown flag" and require retry. Now both:
bd dep add issue-123 issue-456
bd dep add issue-123 --blocked-by issue-456
work identically.
Closes GH#888
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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