threat-model is agent-read markdown (skill) from cowork-os/cowork-os: Use when Codex is already in the threat-modeling phase of a security scan, the user explicitly invokes $threat-model, or the user explicitly asks to create, update, or persist a repository threat model. Do not use as the primary trigger for full PR, commit, branch, patch, or repository scans..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Security Threat Model
## Objective
Establish the repository-scoped threat model at the path defined in `../../references/scan-artifacts.md`. If this already exists, stop here. If a threat model or clearly authoritative security scan guidance is provided or already exists, persist it unchanged to this file, then stop here.
`AGENTS.md` can be that authoritative source when it is sufficiently specific about the repository's product surfaces, trust boundaries, attacker-controlled inputs, assumptions, or security scan guidance to serve as the threat model.
If no threat model is provided, generate a repository-scoped threat model to be used in future bug discovery. The threat model should holistically cover the entire repository and should make it obvious:
- what assets or privileges matter
- what trust boundaries exist
- what inputs are attacker-controlled
- what invariants the code must preserve
- what repository-wide failure modes would matter most
## Artifact Resolution
The path references in this skill are the default locations for this phase.
…
Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
A 17 of 17 checks passed. Deterministic, no model, same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4132 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
cowork-os/cowork-os · 459 stars · license MIT · pushed 2026-09-23 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tjopxfvk7imrjbbh
GET https://markdownregistry.com/api/v1/resolve?ref=cowork-os/cowork-os/threat-model
GET https://markdownregistry.com/api/v1/blob/9a73305a379a6e777a2c1476174c429fdc3450c89fc1c00a66fa7eac997004fc
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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