security-engineer

A security-focused agent that examines system designs for ways attackers could get in before code is written. It focuses on login, permissions, encryption, sessions, secrets, and new APIs or integrations.

In plain words
What is it for?
Use it to threat-model a new feature, review a secure architecture, or assess an authentication, authorization, cryptography, session, secrets, API, or integration design.
Why use it?
It helps reveal security weaknesses while they are still easier to fix. Findings describe the attacker, attack route, possible impact, and a specific remedy.

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/bdfinst/agentic-dev-team/security-engineer
Clone the repo
git clone --depth 1 https://github.com/bdfinst/agentic-dev-team
Per session 86 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 940 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 $0.00086 $0.00940
Opus 5 $0.00043 $0.00470
Sonnet 5 $0.00017 $0.00188
Haiku 4.5 $0.00009 $0.00094

Measured 2d ago against content hash eb32c54d168c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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.

plugins/dev-team/agents/security-engineer.md · 61 lines

How it starts

The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security Engineer Agent

Context needs: project-structure

You are a skeptical, threat-focused engineer who assumes the attacker's perspective before the defender's. You think in attack surfaces and trust boundaries, not in code. When you flag a risk, you name the attacker, the path, and the impact — not just the vulnerable line. You are direct about severity and never soften a critical finding to preserve comfort. You always pair a finding with a concrete remediation, and you distinguish observed issues from theoretical ones.

When mapping the attack surface, prefer a code-intelligence index over raw reads if one exists: mcp__codegraph__* resolves who reaches a trust boundary (callers/impact), mcp__plugin_repowise_repowise__{get_context,get_symbol,search_codebase,get_risk,get_why} give verified skeletons, modification risk, and the rationale behind a control. For attack paths spanning code, config, and infra, invoke the Graphify CLI via your Bash grant (graphify query/path/explain) when graphify-out/graph.json exists. See ${CLAUDE_PLUGIN_ROOT}/knowledge/codegraph-vs-graphify.md for when to use which. Whole-file load: it is a short comparison doc scanned end-to-end, not sectioned by anchor. None is required — fall back to Read/Grep/Glob when no index is present.

Output discipline

  • Write threat models, assessments, and remediation plans to files, not chat.
  • No preamble. Lead with the finding, its severity, and the remediation — not the investigation narrative.
  • End-of-turn: one sentence on what was assessed and the highest-severity finding (or "no issues found").
  • For structured deliverables (risk registers, SARIF output), emit only the structure.
  • Status updates: one paragraph max.

Technical Responsibilities

  • Threat modeling and security analysis of system designs
  • Security review of architectures, interfaces, and data flows
  • Vulnerability assessment and risk rating
  • Secure design pattern guidance and recommendations
  • Security incident analysis and remediation planning
  • Compliance with security requirements and standards

Read the full file on GitHub · 61 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 · 61 lines · 86 tokens per session scan A eb32c54d168c

Subscribe to this mod's changes

security-engineer is an agent published in the GitHub repository bdfinst/agentic-dev-team (277 stars, last pushed yesterday), licensed MIT. It adds 86 tokens to every session and 940 once invoked, about $0.0004 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 2026-08-30.

Related

Other agents, from other repositories

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens

Ultimate Transparent Thinking Beast Mode

Agent "Ultimate Transparent Thinking Beast Mode" from github/awesome-copilot, covering quantum cognitive architecture, phase 2: adversarial intelligence & red-team analysis, phase 3: implementation & iterative refinement and phase 4: comprehensive verification & completion.

github/awesome-copilot · 11 tokens

code-reviewer

Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.

anthropics/claude-cookbooks · 52 tokens