Gemini

A command-line coding agent from Google that uses Gemini and supports hooks, Agent Skills, and extensions.

In plain words
What is it for?
It is for command-line coding tasks that use hooks, skills, or extensions to add capabilities.
Why use it?
It lets developers use Gemini for coding work from a terminal while extending its behavior with project tools and instructions.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/nevir/agentfill/gemini
Clone the repo
git clone --depth 1 https://github.com/nevir/agentfill
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,290 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.02290
Opus 5 $0.00000 $0.01145
Sonnet 5 $0.00000 $0.00458
Haiku 4.5 $0.00000 $0.00229

Measured 2d ago against content hash 4335b141d288, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

Gemini scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

- **File**: `~/.gemini/settings.json`
docs/agents/Gemini.md · 321 lines

The source is not reproduced here

Licensed BlueOak-1.0.0

The repository is licensed BlueOak-1.0.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 321 lines · 0 tokens per session scan B 4335b141d288

Subscribe to this mod's changes

Gemini is an agent published in the GitHub repository nevir/agentfill (19 stars, last pushed 6mo ago), licensed BlueOak-1.0.0. It costs nothing until one of its globs matches a file; then it loads 2,290 tokens. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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