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.
npx agentmods add instructions/thoreinstein/extension-creator/gemini-mdgit clone --depth 1 https://github.com/thoreinstein/extension-creatorWrote 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/thoreinstein/extension-creator/gemini-md)<a href="https://agentmods.dev/instructions/thoreinstein/extension-creator/gemini-md"><img src="https://agentmods.dev/badge/instructions/thoreinstein/extension-creator/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 | $0.00093 | $0.00093 |
| Opus 5 | $0.00046 | $0.00046 |
| Sonnet 5 | $0.00019 | $0.00019 |
| Haiku 4.5 | $0.00009 | $0.00009 |
Grade A, and why
extension-creator 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 3d 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.
What it actually says
Extensions Creator
This extension assists in creating new Gemini CLI extensions.
Usage
Run the following command to start the scaffolding wizard:
/new-extension
This will activate the extension-expert skill and guide you through:
- Naming and describing your extension.
- Setting up the directory structure.
- Creating the
gemini-extension.jsonmanifest. - Adding tools, skills, or commands.
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.
- 3d ago First seen · 18 lines · 93 tokens per session scan A 19ed40ee6045
extension-creator GEMINI.md is an instructions file published in the GitHub repository thoreinstein/extension-creator (2 stars, last pushed 6mo ago), licensed MIT. It adds 93 tokens to every session, about $0.0005 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.
Other instructions, from other repositories
security GEMINI.md
Instructions for gemini-cli-extensions/security, covering standard operating procedures: security analysis guidelines, persona and guiding principles, skillset: permitted tools & investigation, skillset: sast vulnerability analysis and 1.1. hardcoded secrets.
jules GEMINI.md
Instructions for gemini-cli-extensions/jules, covering jules extension, command: /jules, activation and response, starting a jules task and jules-related queries.
pickle-rick-extension GEMINI.md
Instructions for galdawave/pickle-rick-extension, covering pickle rick extension, project overview, key components, 1. configuration and 2. persona definition.
code-review GEMINI.md
Instructions for gemini-cli-extensions/code-review: The code-review extension introduces the following commands.
self-command GEMINI.md
Instructions for stevenAthompson/self-command, covering self command extension, tools, 1. selfcommand, 2. geminisleep and 3. watchlog.
run-long-command GEMINI.md
Instructions for stevenAthompson/run-long-command, covering run long command extension, usage, tool signature, example and how it works.