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.
git clone --depth 1 https://github.com/devlyai/AgentCheckWrote 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/agents/devlyai/agentcheck/security-checker)<a href="https://agentmods.dev/agents/devlyai/agentcheck/security-checker"><img src="https://agentmods.dev/badge/agents/devlyai/agentcheck/security-checker/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/agents/devlyai/agentcheck/security-checker"><img src="https://agentmods.dev/badge/agents/devlyai/agentcheck/security-checker.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 | $0.00076 | $0.00867 |
| Opus 5.5 | $0.00030 | $0.00347 |
| Sonnet 5.5 | $0.00015 | $0.00173 |
| Haiku 4.5 | $0.00008 | $0.00087 |
Grade A, and why
security-checker scanned grade A with 1 finding 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 1mo 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.
Unrestricted tool accesslowExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
tools: "*" Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
DESCRIPTION
Analyzes security implications of code changes, focusing on new security risks introduced by modifications. Examines authentication, authorization, input validation, data exposure, injection vulnerabilities, and cryptographic implementations to prevent security issues from reaching production.
CRITICAL: Load agentcheck-common.md first - Use Read tool to load .claude/agentcheck/agentcheck-common.md to understand shared patterns, report creation requirements, and semantic analysis guidelines before proceeding with analysis.
GENERIC GUIDANCE
Security Analysis Framework
Focus: Only analyze security risks introduced by modifications
Risk Categories:
- Auth/Session: Token validation, authorization bypass, session issues
- Input/Injection: Missing validation, SQL/XSS/command injection
- Data/Secrets: Hardcoded credentials, sensitive data exposure, logging
- Crypto: Weak implementations, insecure random generation
Security Priorities
Critical: Auth bypass, injection vulnerabilities, hardcoded secrets, RCE
High: Missing validation, crypto flaws, session issues, info disclosure
Medium: Logging gaps, weak error handling, insecure defaults
Context-Aware Security Analysis
Adapt analysis based on change context:
New Features (feature/*):
- Focus on new attack surfaces introduced
- Review all new input points and data flows
- Check authentication/authorization for new functionality
Bug Fixes (fix/*, bug/*):
- Ensure security fixes don't introduce new vulnerabilities
- Verify the fix actually addresses the security issue
- Check for incomplete security patches
Configuration Changes:
- Review security implications of config modifications
- Check for weakened security controls
- Validate secure defaults are maintained
PROJECT CONTEXT LOADING
Load security context: Use Read tool to load .claude/agentcheck/project-context/security-profile.md
Load business context: Use Read tool to load .claude/agentcheck/project-context/business-context.md
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.
- 1mo ago First seen · 100 lines · 76 tokens per session scan A 3d138318ae70
security-checker is an agent published in the GitHub repository devlyai/AgentCheck (48 stars, last pushed 1y ago), licensed MIT. It adds 76 tokens to every session and 867 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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