Invoke external AI CLIs (Gemini, Claude, Codex, OpenCode, Qwen Code, Cursor) to independently review phase plans. Produces a structured REVIEWS.md with per-reviewer feedback that can be fed back into planning via /gsd-plan-phase --reviews.

Flow: Detect CLIs → Build review prompt → Invoke each CLI → Collect responses → Write REVIEWS.md

<execution_context> @~/.claude/gsd-core/workflows/review.md </execution_context>

Phase number: extracted from $ARGUMENTS (required)

Flags:

• --gemini — Include Gemini CLI review
• --claude — Include Claude CLI review (uses separate session)
• --codex — Include Codex CLI review
• --opencode — Include OpenCode review (uses model from user's OpenCode config)
• --qwen — Include Qwen Code review (Alibaba Qwen models)
• --cursor — Include Cursor agent review
• --agy / --antigravity — Include Antigravity CLI review
• --all — Include all available CLIs

No flags — if review.default_reviewers is set, review with only those configured reviewers that are detected; otherwise review with all available CLIs. Configured review.reviewer_instances names may appear in review.default_reviewers; each runs as an independent reviewer identity backed by its configured adapter+model (see docs/CONFIGURATION.md). Instance names are not valid as flags.

Execute end-to-end.