Borrowing it
Nothing to install: this file belongs to tractorjuice/arckit-gemini. 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/tractorjuice/arckit-gemini/main/GEMINI.mdgit clone --depth 1 https://github.com/tractorjuice/arckit-geminiWrote 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/tractorjuice/arckit-gemini/gemini-md)<a href="https://agentmods.dev/instructions/tractorjuice/arckit-gemini/gemini-md"><img src="https://agentmods.dev/badge/instructions/tractorjuice/arckit-gemini/gemini-md.svg" alt="Measured on agentmods" 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 | $0.01590 | $0.01590 |
| Opus 5 | $0.00795 | $0.00795 |
| Sonnet 5 | $0.00318 | $0.00318 |
| Haiku 4.5 | $0.00159 | $0.00159 |
Grade A, and why
arckit-gemini 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 7d 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 — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ArcKit - Gemini Extension Context
ArcKit is The Enterprise Architecture Governance Harness, providing 75 slash commands across strategy, architecture, delivery, assurance, and interoperability. It transforms architecture governance from scattered documents into a systematic, template-driven process.
Extension File Locations
This extension is installed at ~/.gemini/extensions/arckit/. Key directories:
- Templates:
~/.gemini/extensions/arckit/templates/ - Scripts:
~/.gemini/extensions/arckit/scripts/bash/ - Guides:
~/.gemini/extensions/arckit/docs/guides/ - Skills:
~/.gemini/extensions/arckit/skills/
Template Override
Users can customize templates by placing overrides in their project:
- Project override:
.arckit/templates/{template-name}(takes precedence) - Extension default:
~/.gemini/extensions/arckit/templates/{template-name}(fallback)
When a command reads a template, check .arckit/templates/ first. If not found, fall back to the extension path.
Command Invocation
/arckit:<command-name> <arguments>
Example: /arckit:requirements Create requirements for a cloud migration project
Document Control Standard
Every command that produces a Markdown artifact must render the canonical Document Control table and Revision History.
Document Control Fields (in order)
| Field | Example |
|---|---|
| Document ID | ARC-001-REQ-v1.0 |
| Document Type | Requirements Specification |
| Project | PROJECT_NAME (Project PROJECT_ID) |
| Classification | PUBLIC / OFFICIAL / OFFICIAL-SENSITIVE / SECRET |
| Status | DRAFT / IN_REVIEW / APPROVED / PUBLISHED / SUPERSEDED / ARCHIVED |
| Version | 1.0 |
| Created Date | YYYY-MM-DD |
| Last Modified | YYYY-MM-DD |
| Review Cycle | Monthly / Quarterly / Annual / On-Demand |
| Next Review Date | YYYY-MM-DD |
| Owner | Role or individual |
| Reviewed By | Name (date) or PENDING |
| Approved By | Name (date) or PENDING |
| Distribution | Distribution list |
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.
- 7d ago First seen · 195 lines · 1,590 tokens per session scan A 592c2310613d
arckit-gemini GEMINI.md is an instructions file published in the GitHub repository tractorjuice/arckit-gemini (3 stars, last pushed 4d ago), licensed MIT. It adds 1,590 tokens to every session, about $0.0080 per session on Opus 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 2026-08-31.
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