Borrowing it
Nothing to install: this file belongs to FerroxLabs/ferrox-factory. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/FerroxLabs/ferrox-factory/main/GEMINI.mdgit clone --depth 1 https://github.com/FerroxLabs/ferrox-factoryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/ferroxlabs/ferrox-factory/gemini-md)<a href="https://agentmods.dev/instructions/ferroxlabs/ferrox-factory/gemini-md"><img src="https://agentmods.dev/badge/instructions/ferroxlabs/ferrox-factory/gemini-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/ferroxlabs/ferrox-factory/gemini-md"><img src="https://agentmods.dev/badge/instructions/ferroxlabs/ferrox-factory/gemini-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00617 | $0.00617 |
| Opus 5.5 | $0.00247 | $0.00247 |
| Sonnet 5.5 | $0.00123 | $0.00123 |
| Haiku 4.5 | $0.00062 | $0.00062 |
Grade A, and why
ferrox-factory GEMINI.md scanned grade A with 0 findings 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 1mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ferrox Core — Antigravity CLI context
Gemini CLI was sunset by Google on 2026-06-18 and is no longer served for free/Pro/Ultra tiers. Antigravity CLI is its official successor, and this file is the context Antigravity reads automatically (its
contextFileNameisGEMINI.md, inherited from the shared Gemini 3 backend).
This context gives Antigravity the operating context for Ferrox Core, a meta-prompting, context-engineering, and spec-driven development system for AI coding agents.
What Ferrox is
Ferrox turns a vague goal into shipped software through an explicit,
resumable workflow: explore → plan → execute → verify → ship. Work is
organised into milestones and phases under a .planning/ directory, with each
phase carrying a SPEC, a PLAN, and verification criteria. The system favours
small, atomic, test-backed commits and keeps durable context in version-tracked
files rather than in the conversation.
The slash commands (installed separately)
This file ships only the context above — not the slash commands. To install the
/ferrox-*command set, agents, and hooks into~/.gemini/antigravity/, run the dedicated installer:npx ferrox-core --antigravity --globalThe commands below are available only once that installer has run.
If you have installed the ferrox commands, the workflow is driven by these /ferrox-*
slash commands (Antigravity registers ferrox's commands under a hyphenated
namespace):
/ferrox-new-project— initialise a project and gather deep context./ferrox-progress— the unified situational command: check progress, advance the workflow, or dispatch a freeform intent./ferrox-plan-phase <N>— produce a detailed phase plan with a verification loop./ferrox-execute-phase <N>— execute a phase's plans with wave-based parallelism./ferrox-verify-work— validate built features through conversational UAT./ferrox-ship— open a PR, run review, and prepare for merge./ferrox-help— list every available command.
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.
- 1mo ago First seen · 56 lines · 617 tokens per session scan A 0e54470a3265
ferrox-factory GEMINI.md is an instructions file published in the GitHub repository FerroxLabs/ferrox-factory (23 stars, last pushed 2mo ago), licensed MIT. It adds 617 tokens to every session, about $0.0025 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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