What is ystack_review?

A security and correctness reviewer that examines code for common defects and unsafe behavior. It looks for issues such as missing login checks, unsafe input, browser-script attacks, race conditions, and unhandled errors.

Auditing code before release and reporting critical issues, warnings, and suggestions with the affected file, line, and correction.

It helps catch problems that ordinary feature testing may miss, especially issues that could expose data or cause failures in unusual situations. Findings include severity, location, and a suggested fix.

How Yasuui/ystack configures Claude Code and Gemini CLI

Reuse

Borrowing it

Nothing to install: this file belongs to Yasuui/ystack. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Yasuui/ystack/main/.gemini/agents/review.md

Clone the repo

git clone --depth 1 https://github.com/Yasuui/ystack

Made for: Claude Code, Gemini CLI.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/yasuui/ystack/review/github.svg)](https://agentmods.dev/agents/yasuui/ystack/review)

Your own site

<a href="https://agentmods.dev/agents/yasuui/ystack/review"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/review/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/yasuui/ystack/review"><img src="https://agentmods.dev/badge/agents/yasuui/ystack/review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 136 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00016	$0.00136
Opus 5.5	$0.00006	$0.00054
Sonnet 5.5	$0.00003	$0.00027
Haiku 4.5	$0.00002	$0.00014

Measured 2mo ago against content hash 50b053b143ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ystack_review 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 2mo 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.

.gemini/agents/review.md · 13 lines

What it actually says

You are the ystack Review Agent. Read code assuming something is wrong.

Check: unvalidated input, missing auth, secrets in responses, XSS, null handling, race conditions, unhandled rejections, missing error boundaries. Rate: [CRITICAL] [WARNING] [SUGGESTION] with file + line + fix.

Write to .agents/brain/review-output.md. End with: STATUS: READY or STATUS: NOT READY — [reason]

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.

2mo ago First seen · 13 lines · 16 tokens per session scan A 50b053b143ef

Subscribe to this mod's changes

ystack_review is an agent published in the GitHub repository Yasuui/ystack (1 stars, last pushed 1mo ago), licensed MIT. It adds 16 tokens to every session and 136 once invoked, about $0.0001 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 2026-08-31.

Code review Security ai-tools antigravity developer-tools gemini-cli mcp open-source

ystack_review next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ystack_reviewYasuui/ystack	Agent	1	1mo ago	MIT	A	16	Claude Code, Gemini CLI
code-reviewerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	38	Claude Code
go-reviewerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	37	Claude Code
themis-qa-auditorarsenelupin14/THEMIS	Agent	4	4mo ago	MIT	A	31	Claude Code
kotlin-reviewerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	38	Claude Code
cpp-reviewerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	41	Claude Code
database-reviewerJamkris/everything-gemini-code	Agent	93	5mo ago	MIT	A	48	Claude Code

ystack: Agent for Claude Code