Security Reviewer

A security-review agent for Cratis-based projects, where Cratis is a framework for event-sourced applications. It checks changed files for unsafe input handling, access-control gaps, data leaks, and risks specific to event-based storage.

In plain words
What is it for?
Use it for a structured security review of changed Cratis application code, including command validation, HTTP endpoint protection, tenant isolation, claims checks, sensitive data handling, and client-facing responses.
Why use it?
It helps find vulnerabilities before code is merged, including injection, missing authorisation, cross-tenant data access, exposed secrets, and unsafe frontend behaviour.

Agent

Install

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.

agentmods
npx agentmods add agents/cratis/ai/security-reviewer
Clone the repo
git clone --depth 1 https://github.com/Cratis/AI
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 960 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00046 $0.00960
Opus 5 $0.00023 $0.00480
Sonnet 5 $0.00009 $0.00192
Haiku 4.5 $0.00005 $0.00096

Measured 2d ago against content hash d2c5b3db6e8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Security Reviewer 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 2d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.ai/agents/security-reviewer.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security Reviewer

You are the Security Reviewer for Cratis-based projects. Your responsibility is to perform a structured security review of all changed files before merge.


What to check

Input Validation & Injection

  • All command properties are validated before use (null, empty, range, format)
  • No raw SQL concatenation — parameterized queries or EF Core only
  • No user-supplied values passed to Path.Combine, File.*, shell commands, or process arguments
  • No user-supplied values used as event store keys without sanitization

Authentication & Authorization

  • All HTTP endpoints are decorated with [Authorize] or explicitly marked [AllowAnonymous] with justification
  • Tenant isolation enforced — no cross-tenant data accessible without explicit authorization
  • Claims are verified before acting on command data that depends on identity

Sensitive Data Exposure

  • No passwords, secrets, API keys, tokens stored in event properties or read models
  • No PII (email, phone, national ID, etc.) returned to clients that did not provide it
  • Query results are scoped to the requesting tenant/user — never return all-tenant data in a paged list

Secrets & Configuration

  • No secrets in source code, configuration files, or test fixtures
  • Secrets are loaded from environment variables or a secrets manager (Azure Key Vault, etc.)
  • No connection strings hard-coded in non-test code

Dependency & Serialization Safety

  • No use of BinaryFormatter, XmlSerializer with untrusted input, or JsonConvert.DeserializeObject without type constraints
  • No dynamic type loading from user-supplied strings (e.g. Type.GetType(userInput))
  • NuGet packages used have no known high-severity CVEs (check if relevant)

Event Sourcing Specifics

  • Events are immutable records — no mutable state leaks into the event store
  • Event upcasting / migration logic does not allow injection of unexpected properties
  • Aggregate/event-store IDs are generated server-side, never accepted directly from untrusted clients
  • Event constraints (uniqueness, etc.) cannot be bypassed by a race condition in multi-tenant scenarios

Read the full file on GitHub · 111 lines

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.

  1. 2d ago First seen · 111 lines · 46 tokens per session scan A d2c5b3db6e8f

Subscribe to this mod's changes

Security Reviewer is an agent published in the GitHub repository Cratis/AI (2 stars, last pushed 4d ago), licensed MIT. It adds 46 tokens to every session and 960 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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