Rails Second Opinion (Local Agentic CLI)

Delegate review of Rails work (uncommitted diff, branch, or PR) to a locally-installed agentic CLI. Wraps the CLI in a structured Self-Review → External Review → Reconcile → Synthesize loop with H/M/L severity gating, mirroring the consult-outside-expert workflow but without MCP dependence.

Read @references/guide.md and follow it. Do not proceed without it.

Invocation

• /jr-rails-second-opinion (review uncommitted changes; default)
• /jr-rails-second-opinion <branch> (review <branch> diff vs main)
• /jr-rails-second-opinion <PR#> (fetch PR with gh, review the diff)
• /jr-rails-second-opinion --multi (run review through 2+ CLIs in parallel and reconcile)

Workflow Overview

1. CLI Discovery (Required First Step)

Probe for installed agentic CLIs. Do not trust the inherited $PATH or $SHELL — Claude Code's Bash tool spawns a non-login shell that misses fish/zsh PATH entries and most version-manager shims (asdf, mise, volta, fnm, bun, pnpm). Worse, $SHELL may report /bin/zsh even when the user actually runs fish (macOS user record defaults to zsh; fish is exec'd from .zshrc). Probe every installed user shell, merge their login PATHs, then augment with common install dirs: