@rules/routing.md

Gemini Skill

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Default all user-facing deliverables, saved artifacts, reports, plans, generated docs, summaries, handoff notes, commit/message drafts, and validation notes to Korean, even when this canonical skill file is written in English.

Preserve source code identifiers, CLI commands, file paths, schema keys, JSON/YAML field names, API names, package names, proper nouns, and quoted source excerpts in their required or original language.

Use a different language only when the user explicitly requests it, an existing target artifact must stay in another language for consistency, or a machine-readable contract requires exact English tokens. If a localized template or reference exists (for example *.ko.md or *.ko.json), prefer it for user-facing artifacts.

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Wrap the official Google Gemini CLI for reasoning, research, plan-mode review, and session continuation. The CLI must be invoked headlessly with -p / --prompt — positional prompts open the interactive REPL.

Defaults

Parameter	Default
Model selection	Use the Gemini CLI default (-m auto) unless the user explicitly asks for -m pro, -m flash, -m flash-lite, or a specific id
Approval mode	--approval-mode default (prompts on every tool call)
Headless mode	-p / --prompt
Resume target	gemini --resume latest (or gemini -r for the most recent)
Output format	text (use --output-format json only when the caller needs structured output)

Do NOT specify -m unless the user explicitly requested a model. Auto routing picks Pro for reasoning and Flash for execution.

Routing

Use this skill only when the request actually needs the Gemini CLI or a Gemini session.

• Read rules/routing.md before building a command when the request might be out of scope.
• Route away to direct editing or another skill when the user wants generic writing, runbook cleanup, or local edits without needing the Gemini CLI.

CRITICAL: Headless Mode

Always use -p / --prompt for non-interactive Gemini runs. A positional prompt drops into the interactive REPL and blocks automation.

# Correct — non-interactive
gemini --approval-mode default -p "your prompt here"

# Interactive (do not use for automation)
gemini "your prompt here"

If you need to seed the prompt and then keep talking interactively, use -i / --prompt-interactive instead. -p is for one-shot, automated runs.

Running a Task

Read references/recipes.md for concrete command recipes before changing approval modes, adding sandboxing, picking a model, or resuming a session.

Approval Mode Selection

Flag	When to use
--approval-mode default	General research, reasoning, and standard Gemini usage
--approval-mode auto_edit	Only when the user explicitly asks Gemini to edit files
--approval-mode plan	Read-only planning or analysis with no code modifications (write is restricted to Markdown in the plans directory)
--approval-mode yolo	Only after the user explicitly approves a full-auto run. Prefer this spelling — the bare --yolo flag is deprecated.

Command Discipline

• Start from gemini --approval-mode default -p "your prompt here".
• Add -m <pro|flash|flash-lite|auto|model-id> only when the user explicitly asks for a specific Gemini model.
• Use --approval-mode auto_edit for normal edits instead of full auto-approve.
• Ask before using --approval-mode yolo. Prefer --approval-mode auto_edit or --sandbox first.
• Add --sandbox (-s) when the task is higher-risk or you want tighter local constraints.
• Pass extra workspaces with --include-directories /path/a,/path/b when Gemini needs context outside the current folder.
• Use --output-format json only when the caller will parse the response programmatically.

Resuming a Session

gemini --resume latest -p "your follow-up prompt"
gemini --list-sessions
gemini --delete-session 2

--resume accepts latest, an index from --list-sessions, or a full session UUID. Inside an interactive session, use /resume to open the Session Browser and /rewind to step backward.

When resuming, keep the existing session behavior and do not change model or approval mode unless the user asks.

After Completion

• Summarize the result, including any warnings or partial output.
• Tell the user they can resume with gemini --resume latest (or gemini -r).
• Ask whether to continue, adjust the prompt, or switch back to direct work.

Critical Evaluation

Treat Gemini as a colleague, not an authority.

• Trust your knowledge when confident. Push back on incorrect claims directly.
• Research disagreements using current sources or docs before accepting Gemini's claims.
• Remember knowledge cutoffs — Gemini may not know about recent releases or API changes.
• When freshness matters, ask Gemini for current sources and verify important claims against docs or primary sources.
• Let the user decide when there is genuine ambiguity.

Preflight Check

Before building any command, verify the CLI is installed and on PATH:

command -v gemini >/dev/null 2>&1 || { echo "gemini CLI not found"; exit 1; }

If the check fails, route to the install handler in Error Handling below instead of constructing a gemini ... command.

Error Handling

• command not found: gemini: tell the user to install with npm install -g @google/gemini-cli (or brew install gemini-cli).
• Auth errors: run gemini and complete the sign-in flow, or set GEMINI_API_KEY. For Vertex AI, set GOOGLE_API_KEY and GOOGLE_GENAI_USE_VERTEXAI=true.
• 429 / rate limit: free tier is 60 req/min, 1000 req/day on Gemini 3 — wait or upgrade.
• 404 / model not found: retry without -m, or pick pro/flash/flash-lite from gemini --help and the official docs.
• 403 / access denied: check the active auth path and retry with a supported model or account configuration.
• Session not found: run gemini --list-sessions.
• Exit code 42 means input error (bad flag/prompt); 53 means turn limit exceeded.

Version Notes

• Targets Gemini CLI v0.40.0 behavior; minimum supported v0.21.1 (Gemini 3 routing).
• --yolo is deprecated; the canonical form is --approval-mode yolo.
• Plan Mode is enabled by default; trigger explicitly with --approval-mode plan or /plan in-session.
• Headless mode auto-activates in non-TTY environments and whenever -p is supplied.