Sec Check
waynesutton/markdown-site
Security review checklist for Convex functions, auth logic, public queries, admin routes, webhooks, uploads, and AI-generated code.
Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation.
Install Security Threat Model
$ npx skills add majiayu000/spellbook --skill security-threat-model -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install majiayu000/spellbook security-threat-model --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/security-threat-model .claude/skills/security-threat-model && rm -rf skills-srcUse ~/.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/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .claude/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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 install https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-modelType 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.
$ npx skills add majiayu000/spellbook --skill security-threat-model -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install majiayu000/spellbook security-threat-model --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/security-threat-model .agents/skills/security-threat-model && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .agents/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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.
$ npx skills add majiayu000/spellbook --skill security-threat-model -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install majiayu000/spellbook security-threat-model --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/security-threat-model .cursor/skills/security-threat-model && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .cursor/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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 https://github.com/majiayu000/spellbook.git --path skills/security-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.
$ npx skills add majiayu000/spellbook --skill security-threat-model -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install majiayu000/spellbook security-threat-model --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/security-threat-model .gemini/skills/security-threat-model && rm -rf skills-srcUse ~/.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/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .gemini/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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.
$ gh skill install majiayu000/spellbook security-threat-modelInstalls 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).
$ npx skills add majiayu000/spellbook --skill security-threat-model -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/security-threat-model .github/skills/security-threat-model && rm -rf skills-srcUse ~/.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/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .github/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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.
$ npx skills add majiayu000/spellbook --skill security-threat-model -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install majiayu000/spellbook security-threat-model --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/majiayu000/spellbook.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/security-threat-model .opencode/skills/security-threat-model && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "security-threat-model" agent skill from https://github.com/majiayu000/spellbook/tree/main/skills/security-threat-model into .opencode/skills/security-threat-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security-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
security-threat-model- GitHub stars
- 287
- Token cost
- ~561 tokens
- SKILL.md length
- 218 words
- Files
- 2
- Skills in repo
- 97
- Repo updated
- First seen
- Licence
- MIT
At a glance
Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation.
- Works in 5 steps: Assets: credentials, tokens, user data,… → Actors: anonymous user, authenticated… → Trust boundaries: browser/server,… → …
- Touching authentication
- SKILL.md covers Purpose, Scope First, Threat Checklist and Required Controls, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Security Threat Model is an agent skill from majiayu000/spellbook. Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation. Use when touching authentication, authorization, payments, secrets, user data, uploads, webhooks, admin tools, innerHTML/eval/exec, dependency upgrades, or cross-tenant access.
Its SKILL.md is about 560 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Backend & APIs, covering Threat modeling, Webhooks and Supply chain security. The repository describes itself as: Cross-runtime skills for Claude Code, Codex, and multi-agent workflows. The licence is MIT.
When your agent uses it
- Touching authentication
- InnerHTML/eval/exec
- Dependency upgrades
- Cross-tenant access
Example prompts
- “/security-threat-model”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Assets: credentials, tokens, user data, tenant data, money movement, admin actions.
- Actors: anonymous user, authenticated user, tenant admin, internal operator, compromised dependency.
- Trust boundaries: browser/server, service/service, tenant/tenant, CI/runtime, third-party callbacks.
- Entry points: API routes, CLI commands, jobs, webhooks, uploads, config files.
- Existing controls: validation, authz, rate limits, audit logs, secret storage.
What it can do on your machine
Read from SKILL.md and the folder at commit ed52af7. 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.
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
Security Threat Model loads about 561 tokens when it runs. Until then it costs about 91 tokens; SKILL.md has 218 words of instructions outside code blocks.
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 passed
The automated check found no risky patterns in SKILL.md.
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 majiayu000/spellbook at commit ed52af7, republished under its MIT licence (© majiayu000). 218 words, ~561 tokens.
Download SKILL.mdSave it as
.claude/skills/security-threat-model/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- security-threat-model
- description
- Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation. Use when touching authentication, authorization, payments, secrets, user data, uploads, webhooks, admin tools, innerHTML/eval/exec, dependency upgrades, or cross-tenant access.
Security Threat Model
Purpose
Use this skill before implementing or approving security-sensitive changes. It complements auth-security and server-security by mapping assets, attackers, trust boundaries, and concrete controls.
Scope First
Identify:
- Assets: credentials, tokens, user data, tenant data, money movement, admin actions.
- Actors: anonymous user, authenticated user, tenant admin, internal operator, compromised dependency.
- Trust boundaries: browser/server, service/service, tenant/tenant, CI/runtime, third-party callbacks.
- Entry points: API routes, CLI commands, jobs, webhooks, uploads, config files.
- Existing controls: validation, authz, rate limits, audit logs, secret storage.
Threat Checklist
Check at least:
- Spoofing: can an identity, tenant, callback, or service be forged?
- Tampering: can payloads, configs, migrations, artifacts, or logs be altered?
- Repudiation: is there an audit trail for sensitive actions?
- Information disclosure: can secrets, PII, logs, or tenant data leak?
- Denial of service: can expensive paths be amplified?
- Elevation of privilege: can user or service permissions expand?
- Supply chain: can dependencies, scripts, CI, or generated files introduce risk?
Required Controls
Every finding needs one of:
- preventive control in production code,
- detective control with alerting,
- compensating manual control with owner and expiry,
- explicit accepted risk with rationale.
Do not accept "warn and continue" for authz, secrets, tenant isolation, injection, or payment/security-critical failures.
Output Shape
scope:
assets:
trust_boundaries:
entry_points:
threats:
required_controls:
tests_or_probes:
residual_risks:
review_gate:For implementation work, include exact files and verification commands that prove the controls are active.
© majiayu000, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in skills/security-threat-model of majiayu000/spellbook.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit ed52af7
Compare with similar skills
Security 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Security Threat Model this skillmajiayu000/spellbook | 287 | — | ~561 | Automated safety check: Pass | MIT | |
| Sec Checkwaynesutton/markdown-site | 627 | — | ~753 | Automated safety check: Pass | MIT | |
| Security Threat Modelingdevcodex-labs/devcodex | 439 | — | ~771 | Automated safety check: Pass | AGPL-3.0 | |
| Securitytelagod/code-abyss | 244 | — | ~907 | Automated safety check: Pass | MIT | |
| Clickup Security Basicsjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1k | Automated safety check: Pass | MIT | |
| Flexport Security Basicsjeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~1.1k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Security Threat Model
What does Security Threat Model do?
Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation. Security Threat Model is an agent skill from majiayu000/spellbook. Threat-model product features, APIs, data flows, secrets, permissions, supply-chain changes, auth boundaries, and risky code paths before or during implementation.
When should I use Security Threat Model?
Security Threat Model fits situations like: touching authentication; innerHTML/eval/exec; dependency upgrades; cross-tenant access.
How do I install Security Threat Model in Claude Code?
Run `npx skills add majiayu000/spellbook --skill security-threat-model -a claude-code`. Or copy the skill folder (skills/security-threat-model in majiayu000/spellbook) into .claude/skills/security-threat-model in your project. Claude Code loads it when a task matches its description.
How do I install Security Threat Model in Codex?
Run `npx skills add majiayu000/spellbook --skill security-threat-model -a codex`. Or copy the skill folder (skills/security-threat-model in majiayu000/spellbook) into .agents/skills/security-threat-model in your project. Codex loads it when a task matches its description.
Can I use Security 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 majiayu000/spellbook --skill security-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/security-threat-model, .gemini/skills/security-threat-model, .github/skills/security-threat-model and .opencode/skills/security-threat-model in your project.
What does Security Threat Model need to run?
SKILL.md names no scripts, command-line tools or credentials: Security Threat Model is instructions for the agent only.
Does Security 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 Security Threat Model safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Security Threat Model use?
Security 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 Security Threat Model use?
About 561 tokens (SKILL.md is roughly 2.2k 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 Security Threat Model?
Skills that share tags, products or a category with Security Threat Model: Sec Check (waynesutton/markdown-site, 627 stars), Security Threat Modeling (devcodex-labs/devcodex, 439 stars), Security (telagod/code-abyss, 244 stars) and Clickup Security Basics (jeremylongshore/tons-of-skills-marketplace, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Security Threat Model?
majiayu000 (a GitHub user) maintains it in majiayu000/spellbook, which has 287 GitHub stars. The repository holds 97 skills in this directory. The repository was last updated on October 8, 2026.
Source: majiayu000/spellbook on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.