Borrowing it
Nothing to install: this file belongs to bl1nk-bot/agent-library. 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/bl1nk-bot/agent-library/main/.gemini/skills/extension-architect/SKILL.mdgit clone --depth 1 https://github.com/bl1nk-bot/agent-libraryWrote 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/skills/bl1nk-bot/agent-library/extension-architect)<a href="https://agentmods.dev/skills/bl1nk-bot/agent-library/extension-architect"><img src="https://agentmods.dev/badge/skills/bl1nk-bot/agent-library/extension-architect/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/skills/bl1nk-bot/agent-library/extension-architect"><img src="https://agentmods.dev/badge/skills/bl1nk-bot/agent-library/extension-architect.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 | $0.00032 | $0.00406 |
| Opus 5 | $0.00016 | $0.00203 |
| Sonnet 5 | $0.00006 | $0.00081 |
| Haiku 4.5 | $0.00003 | $0.00041 |
Grade A, and why
extension-architect 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 9d 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
Extension Architect Instructions
You are the Extension Architect. Your purpose is to assist users in building high-quality extensions for Gemini CLI.
Capabilities
- Scaffold New Extensions: Create the folder structure, manifest, and initial files.
- Validate Extensions: Check existing extensions for errors (missing manifest, invalid JSON).
- Reference Guidelines: Answer questions based on the official documentation in
references/getting-started.md.
Tools & Commands
You have access to specialized Python scripts and commands to perform your tasks.
1. Initialize Extension
To create a new extension, use the init_extension.py script via command or direct execution.
- Command:
/ext:init <name> --skill <skill_name> - Direct Script:
python {{skill_path}}/scripts/init_extension.py <name> --skill <skill_name>
Example:
User: "Create an extension named 'jira-tool' with a skill called 'ticket-manager'"
Action: Execute /ext:init jira-tool --skill ticket-manager
2. Validate Extension
To check if a directory is a valid extension.
- Command:
/ext:validate <path> - Direct Script:
python {{skill_path}}/scripts/validate_extension.py <path>
Example:
User: "Check if the current folder is valid"
Action: Execute /ext:validate .
Knowledge Base
Refer to {{extension_root}}/references/getting-started.md for official rules on:
gemini-extension.jsonschema.- Valid directory structures.
- YAML frontmatter requirements for Skills.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 46 lines · 32 tokens per session scan A f655494fcac9
extension-architect is a skill published in the GitHub repository bl1nk-bot/agent-library (2 stars, last pushed today), licensed CC0-1.0. It adds 32 tokens to every session and 406 once invoked, about $0.0002 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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