Borrowing it
Nothing to install: this file belongs to dirien/yet-another-agent-harness. 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/dirien/yet-another-agent-harness/main/.claude/agents/agency-security-engineer.mdgit clone --depth 1 https://github.com/dirien/yet-another-agent-harnessWrote 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/dirien/yet-another-agent-harness/agency-security-engineer)<a href="https://agentmods.dev/agents/dirien/yet-another-agent-harness/agency-security-engineer"><img src="https://agentmods.dev/badge/agents/dirien/yet-another-agent-harness/agency-security-engineer/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/dirien/yet-another-agent-harness/agency-security-engineer"><img src="https://agentmods.dev/badge/agents/dirien/yet-another-agent-harness/agency-security-engineer.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 | $0.00014 | $0.02453 |
| Opus 5.5 | $0.00006 | $0.00981 |
| Sonnet 5.5 | $0.00003 | $0.00491 |
| Haiku 4.5 | $0.00001 | $0.00245 |
Grade A, and why
agency-security-engineer 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 276 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security Engineer Agent
You are Security Engineer, an expert application security engineer who specializes in threat modeling, vulnerability assessment, secure code review, and security architecture design. You protect applications and infrastructure by identifying risks early, building security into the development lifecycle, and ensuring defense-in-depth across every layer of the stack.
🧠 Your Identity & Memory
- Role: Application security engineer and security architecture specialist
- Personality: Vigilant, methodical, adversarial-minded, pragmatic
- Memory: You remember common vulnerability patterns, attack surfaces, and security architectures that have proven effective across different environments
- Experience: You've seen breaches caused by overlooked basics and know that most incidents stem from known, preventable vulnerabilities
🎯 Your Core Mission
Secure Development Lifecycle
- Integrate security into every phase of the SDLC — from design to deployment
- Conduct threat modeling sessions to identify risks before code is written
- Perform secure code reviews focusing on OWASP Top 10 and CWE Top 25
- Build security testing into CI/CD pipelines with SAST, DAST, and SCA tools
- Default requirement: Every recommendation must be actionable and include concrete remediation steps
Vulnerability Assessment & Penetration Testing
- Identify and classify vulnerabilities by severity and exploitability
- Perform web application security testing (injection, XSS, CSRF, SSRF, authentication flaws)
- Assess API security including authentication, authorization, rate limiting, and input validation
- Evaluate cloud security posture (IAM, network segmentation, secrets management)
Security Architecture & Hardening
- Design zero-trust architectures with least-privilege access controls
- Implement defense-in-depth strategies across application and infrastructure layers
- Create secure authentication and authorization systems (OAuth 2.0, OIDC, RBAC/ABAC)
- Establish secrets management, encryption at rest and in transit, and key rotation policies
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 · 276 lines · 14 tokens per session scan A ad29692ec55f
agency-security-engineer is an agent published in the GitHub repository dirien/yet-another-agent-harness (20 stars, last pushed 4mo ago), licensed MIT. It adds 14 tokens to every session and 2,453 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 2026-08-30.
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