Gemini CLI Agent

[!WARNING] Gemini CLI consumer access ended June 18, 2026. Free, Pro, and Ultra users no longer have access. Only enterprise Gemini Code Assist Standard/Enterprise licenses retain the gemini binary. If you don't have one of those licenses, this skill will not work — use agy-cli-agent instead, which is now the primary path for Gemini model access.

Identity: The Gemini Sub-Agent Dispatcher (Standard: gemini-3-flash-preview)

You dispatch specialized analysis tasks to Gemini CLI sub-agents using the gemini binary.

[!IMPORTANT] Default model: gemini-3-flash-preview (cost-efficient). For deep reasoning, use gemini-3.1-pro-preview. For frontier models (Gemini 3.5 Flash+), use agy-cli-agent instead.

Minimal Working Pattern

gemini -m gemini-3-flash-preview -p "$(cat agents/persona.md)

---SOURCE CODE---
$(cat target.py)

---INSTRUCTION---
Perform a full code review. Use severity levels: 🔴 CRITICAL, 🟡 MODERATE, 🟢 MINOR.
You are operating as an isolated sub-agent.
Do NOT use tools. Do NOT access filesystem." > review.md

Orchestration Pattern: run_agent.py

python ./scripts/run_agent.py <PERSONA_FILE> <INPUT_FILE> <OUTPUT_FILE> "<INSTRUCTION>" [MODEL_NAME]

Mandatory Health Check

Before any complex orchestration:

1. gemini --yolo -m gemini-3-flash-preview -p "hello"
2. python ./scripts/run_agent.py agents/refactor-expert.md target.py ./heartbeat.md "Verify health"
3. Confirm ./heartbeat.md is not empty.

Example

python ./scripts/run_agent.py agents/security-auditor.md target.py security.md \
"Find vulnerabilities. Use severity levels: 🔴 CRITICAL, 🟡 MODERATE, 🟢 MINOR."

Persona Registry (agents/)

Capability Boundary

Image Generation NOT supported

The gemini binary is text and code only. Image generation models require the Python google-genai SDK with a paid billing account.

Model Capacity

gemini-3.1-pro-preview may hit MODEL_CAPACITY_EXHAUSTED (429) under load — retry or fall back to gemini-2.5-pro.

CLI Best Practices

Avoid Shell Expansion for Large Contexts

$(cat ...) > 10KB can silently fail in background processes. Use run_agent.py which writes to a temp file.

Autonomous Orchestration (--yolo)

Pass --yolo to allow all tool calls to run without confirmation for headless operation.

Workspace Boundary (IDEClient Directory Mismatch)

Always invoke gemini from your active workspace directory. To operate in an external folder, pass a cd instruction in the prompt itself.

Backgrounding & TTY (SIGTTIN)

nohup gemini --yolo -m gemini-3-flash-preview -p "..." >> log.txt 2>&1 < /dev/null &

< /dev/null is critical to prevent SIGTTIN stops.

Update / Install

npm install -g @google/gemini-cli@latest
# or via npx (run_agent.py falls back to this automatically)
npx @google/gemini-cli

Smoke Test

gemini -p "hello"
python ./scripts/run_agent.py agents/refactor-expert.md target.py output.md "Refactor this code."