ctm

ctm is a skill for Claude Code from izar/tm_skills. It costs 23 tokens per session (392 once invoked), scanned A, original, MIT.

A skill that reviews a development request or user story to decide whether it contains a security change worth adding to a threat model—a document describing possible attacks and protections.

In plain words
What is it for?
Use it to find a project’s baseline threat model, enrich a request with project context, and apply a developer checklist to assess whether the request is security notable.
Why use it?
It helps teams notice security-relevant changes that might otherwise be missed during ordinary development planning. Its analysis is weaker when no existing threat model is available.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the tm-skills plugin — 4 skills shipped together

Good fit Use it to find a project’s baseline threat model, enrich a request…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/izar/tm_skills/ctm
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.

Any agent
npx skills add izar/tm_skills --skill ctm
Clone the repo
git clone --depth 1 https://github.com/izar/tm_skills

Made for: Claude Code.

Or install tm-skills, the plugin that ships this one along with the rest of its 4 skills.

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 ctm

README.md
[![agentmods](https://agentmods.dev/badge/skills/izar/tm_skills/ctm.svg)](https://agentmods.dev/skills/izar/tm_skills/ctm)
Your own site
<a href="https://agentmods.dev/skills/izar/tm_skills/ctm"><img src="https://agentmods.dev/badge/skills/izar/tm_skills/ctm.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 392 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 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 5.1 $0.00023 $0.00392
Opus 5 $0.00012 $0.00196
Sonnet 5 $0.00005 $0.00078
Haiku 4.5 $0.00002 $0.00039

Measured 6d ago against content hash 94019a9347fe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

ctm 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 6d 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.

skills/ctm/SKILL.md · 41 lines

What it actually says

Overview

Given a business case, a user-story, a development request or similar, examine it in the context of the project and the existing baseline threat model and decide if it is a "security notable event" according to Continuous Threat Modeling.

Method

Copy this checklist and track your progress:

Security notable event checklist

- [ ] Find a baseline threat model
- [ ] Enrich the request
- [ ] Use the CTM Developer Checklist

**Step 1: Find a baseline threat model

Examine the project's directory for documentation that resembles a threat model. If one is found, use that as the baseline threat model. If one is not found, ask the user if they would like to use the pytm skill to create one, or if they can provide a baseline threat model. Give the user the option to not have a baseline threat model but point out the quality of the analysis will be diminished.

**Step 2: Enrich the request

If a baseline threat model is available, use it to enrich the corpus of the request. Feel free to ask the user as many elucidative questions about the request as you consider necessary. Use the answers to enrich the request.

**Step 3: Use the CTM Developer Checklist

Using the content of ./Secure_Developer_Checklist.md try to identify in the user request instances that match the "If you did THIS ..." side of the reference table. If matches are found, use the "... then do THAT" respective field to suggest mitigations to the issue identified.

There can be many matches in any given request. Return all those matches.

If there are notable events, suggest to the user that a ticket be created reflecting this change so the threat model can be updated.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 41 lines · 23 tokens per session scan A 94019a9347fe

Subscribe to this mod's changes

ctm is a skill published in the GitHub repository izar/tm_skills (19 stars, last pushed 1mo ago), licensed MIT. It adds 23 tokens to every session and 392 once invoked, about $0.0001 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.

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