Agent skill

Threat Model

MCP threat-model artifact for a scaffolded harness. An agent skill from ruvnet/metaharness.

MITAuto-check: notesSecurity

Install Threat Model

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude-plugin/skills/threat-model .claude/skills/threat-model && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .claude/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude-plugin/skills/threat-model .agents/skills/threat-model && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .agents/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude-plugin/skills/threat-model .cursor/skills/threat-model && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .cursor/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/ruvnet/metaharness.git --path .claude-plugin/skills/threat-model

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude-plugin/skills/threat-model .gemini/skills/threat-model && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .gemini/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude-plugin/skills/threat-model .github/skills/threat-model && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .github/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add ruvnet/metaharness --skill threat-model -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install ruvnet/metaharness threat-model --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/ruvnet/metaharness.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude-plugin/skills/threat-model .opencode/skills/threat-model && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "threat-model" agent skill from https://github.com/ruvnet/metaharness/tree/main/.claude-plugin/skills/threat-model into .opencode/skills/threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "threat-model", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: threat-model
GitHub stars: 690
Token cost: ~637 tokens
SKILL.md length: 208 words
Files: 1
Skills in repo: 14
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

MCP threat-model artifact for a scaffolded harness. An agent skill from ruvnet/metaharness.

Tasks that involve Threat modeling
SKILL.md covers What it does, Usage from Codex, Equivalent CLI and When to attach this to a PR, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Tasks that involve Project scaffolding

What it does

Threat Model is an agent skill from ruvnet/metaharness. MCP threat-model artifact for a scaffolded harness. Reports allowed/denied tools, dangerous permissions count, secrets reachability, network/shell/file-write grants, default-deny posture. Verdict: clean (exit 0) / medium (exit 1) / high (exit 2). The 'enterprise gold' artifact for PR + compliance review.

Its SKILL.md is about 640 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Security, covering Threat modeling, Project scaffolding and Regulatory compliance. It works with Model Context Protocol. The repository describes itself as: 🛠️ The meta-harness for AI agents — scaffold your own focused, branded agent harness with its own npx CLI, MCP server, memory, learning loop, and witness-signed releases. Works… The licence is MIT.

When your agent uses it

Tasks that involve Threat modeling
Tasks that involve Project scaffolding
Tasks that involve Regulatory compliance

Example prompts

“enterprise gold”
“/threat-model”

What it can do on your machine

Read from SKILL.md and the folder at commit ea287d6. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Threat Model loads about 637 tokens when it runs. Until then it costs about 80 tokens; SKILL.md has 208 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~80
When it runs · the whole SKILL.md, loaded when a task matches: ~637

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NoteMentions a .env fileSKILL.md:42

use AND deny rules don't guard `.env*` AND allow rules include any

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from ruvnet/metaharness at commit ea287d6, republished under its MIT licence (© ruvnet). 208 words, ~637 tokens.

Download SKILL.mdSave it as .claude/skills/threat-model/SKILL.md (or your agent's skills folder).

name: threat-model
description: MCP threat-model artifact for a scaffolded harness. Reports allowed/denied tools, dangerous permissions count, secrets reachability, network/shell/file-write grants, default-deny posture. Verdict: clean (exit 0) / medium (exit 1) / high (exit 2). The 'enterprise gold' artifact for PR + compliance review.

threat-model

Codex skill: MCP threat-model artifact for PR / compliance review (iter 112 → iter 114). User-labelled "enterprise gold."

What it does

Renders the existing mcp-scan findings as a clean threat-model artifact in the shape a security / compliance reviewer wants to see attached to a PR:

MCP Threat Model

  Allowed tools:         3
  Denied tools:          14
  Dangerous permissions: 0
  Secrets reachable:     no
  Network access:        no
  Shell access:          no
  File write:            no
  Default-deny policy:   yes
  Audit log:             yes

Verdict: clean (exit 0)

Same underlying scan as mcp-scan, presented as a single-screen artifact.

Verdict	Exit	Triggers
`clean`	0	no dangerous perms, no secret exposure
`medium`	1	network OR file-write granted, OR no audit log
`high`	2	shell granted OR default-deny OFF OR secrets reachable

The "secrets reachable" heuristic is conservative: true when MCP is in use AND deny rules don't guard .env* AND allow rules include any Read(...) grant.

Usage from Codex

/threat-model path=./my-harness
/threat-model path=./my-harness bundle=true

Equivalent CLI

bash

harness threat-model ./my-harness                # text artifact
harness threat-model ./my-harness --json         # full envelope
harness threat-model ./my-harness --bundle       # ADR-031 schema-1
harness threat-model ./my-harness --out tm.json  # write to file

When to attach this to a PR

Adding a new MCP server / tool
Loosening a permission allow rule
Pulling in a new dependency that exposes shell/network capabilities
Any change to .harness/mcp-policy.json or .claude/settings.json permissions

The artifact is small enough to paste verbatim into the PR description.

validate-harness (iter 22) — release-readiness umbrella (includes mcp-scan)
score-harness (iter 114) — broader 0-100 scorecard; MCP safety is one of its 5 dimensions
repo-genome (iter 114) — pre-scaffold readiness; MCP risk is one of its 7 sections

Files

Just SKILL.md in .claude-plugin/skills/threat-model of ruvnet/metaharness.

Open the folder on GitHubat commit ea287d6

Compare with similar skills

Threat Model next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Threat Model compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Threat Model this skillruvnet/metaharness	690	—	~637	Automated safety check: Notes	MIT	yesterday
Forensifyalexgreensh/repo-forensics	188	—	~2.5k	Automated safety check: Notes	Custom licence	11 days ago
MCP Gateway SecurityHack23/cia	239	—	~2.4k	Automated safety check: Pass	Apache-2.0	yesterday
Vulners API Python SDKvulnersCom/api	375	—	~2.3k	Automated safety check: Pass	MIT	9 days ago
Chatgpt AppsHaohao-end/openagent	807	1 repos	~4.9k	Automated safety check: Pass	Apache-2.0	2 mo ago
Writing Pluginsnukeop/nuclear	19k	—	~825	Automated safety check: Pass	AGPL-3.0	2 days ago

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Questions about Threat Model

What does Threat Model do?

MCP threat-model artifact for a scaffolded harness. An agent skill from ruvnet/metaharness. Threat Model is an agent skill from ruvnet/metaharness. MCP threat-model artifact for a scaffolded harness.

When should I use Threat Model?

Threat Model fits situations like: tasks that involve Threat modeling; tasks that involve Project scaffolding; tasks that involve Regulatory compliance.

How do I install Threat Model in Claude Code?

Run `npx skills add ruvnet/metaharness --skill threat-model -a claude-code`. Or copy the skill folder (.claude-plugin/skills/threat-model in ruvnet/metaharness) into .claude/skills/threat-model in your project. Claude Code loads it when a task matches its description.

How do I install Threat Model in Codex?

Run `npx skills add ruvnet/metaharness --skill threat-model -a codex`. Or copy the skill folder (.claude-plugin/skills/threat-model in ruvnet/metaharness) into .agents/skills/threat-model in your project. Codex loads it when a task matches its description.

Can I use Threat Model in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ruvnet/metaharness --skill threat-model -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/threat-model, .gemini/skills/threat-model, .github/skills/threat-model and .opencode/skills/threat-model in your project.

What does Threat Model need to run?

SKILL.md names no scripts, command-line tools or credentials: Threat Model is instructions for the agent only.

Does Threat Model access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Threat Model safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Threat Model use?

Threat Model is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Threat Model use?

About 637 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Threat Model?

Skills that share tags, products or a category with Threat Model: Forensify (alexgreensh/repo-forensics, 188 stars), MCP Gateway Security (Hack23/cia, 239 stars), Vulners API Python SDK (vulnersCom/api, 375 stars) and Chatgpt Apps (Haohao-end/openagent, 807 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Threat Model?

ruvnet (a GitHub user) maintains it in ruvnet/metaharness, which has 690 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on October 7, 2026.

Source: ruvnet/metaharness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Threat Model

Install Threat Model

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

threat-model

What it does

Usage from Codex

Equivalent CLI

When to attach this to a PR

See also

Files

Compare with similar skills

Similar skills

Forensify

MCP Gateway Security

Vulners API Python SDK

Chatgpt Apps

Writing Plugins

Tsed CLI

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Repo Genome

Questions about Threat Model

Install Threat Model

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

threat-model

What it does

Usage from Codex

Equivalent CLI

When to attach this to a PR

Related skills

See also

Files

Compare with similar skills

Similar skills

More from ruvnet/metaharness

Related

Questions about Threat Model