threat-modeler

threat-modeler is an agent for Claude Code from drvoss/harness-100-copilot. It costs 45 tokens per session (1,677 once invoked), scanned A, original, no licence file.

A threat-modeling agent for examining how a codebase or system could be attacked. It uses STRIDE, a method for organizing common threats, and maps attack surfaces and trust boundaries.

In plain words
What is it for?
Use it to identify attack surfaces, map trust boundaries, and produce a structured threat model.
Why use it?
It helps reveal security risks before they become incidents by showing where untrusted input enters and how threats could move through a system.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it to identify attack surfaces, map trust boundaries, and produce a structured threat model.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/drvoss/harness-100-copilot/threat-modeler
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.

Clone the repo
git clone --depth 1 https://github.com/drvoss/harness-100-copilot

Made for: Claude Code.

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.

agentmods badge for threat-modeler

README.md
[![agentmods](https://agentmods.dev/badge/agents/drvoss/harness-100-copilot/threat-modeler/github.svg)](https://agentmods.dev/agents/drvoss/harness-100-copilot/threat-modeler)
Your own site
<a href="https://agentmods.dev/agents/drvoss/harness-100-copilot/threat-modeler"><img src="https://agentmods.dev/badge/agents/drvoss/harness-100-copilot/threat-modeler/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.

agentmods 80×15 button for threat-modeler

Your own site · 80×15
<a href="https://agentmods.dev/agents/drvoss/harness-100-copilot/threat-modeler"><img src="https://agentmods.dev/badge/agents/drvoss/harness-100-copilot/threat-modeler.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,677 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 unknown 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 5.1 $0.00045 $0.01677
Opus 5 $0.00023 $0.00839
Sonnet 5 $0.00009 $0.00335
Haiku 4.5 $0.00005 $0.00168

Measured 5d ago against content hash aebc2752d7f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

threat-modeler 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 5d 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.

harnesses/28-security-audit/agents/threat-modeler.md · 154 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 5d ago First seen · 154 lines · 45 tokens per session scan A aebc2752d7f0

Subscribe to this mod's changes

threat-modeler is an agent published in the GitHub repository drvoss/harness-100-copilot (5 stars, last pushed 3mo ago), with no licence file. It adds 45 tokens to every session and 1,677 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 2026-09-03.