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.
npx agentmods add skills/thejefflarson/soundcheck/threat-modelnpx skills add thejefflarson/soundcheck --skill threat-modelgit clone --depth 1 https://github.com/thejefflarson/soundcheckWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00078 | $0.00759 |
| Opus 5 | $0.00039 | $0.00380 |
| Sonnet 5 | $0.00016 | $0.00152 |
| Haiku 4.5 | $0.00008 | $0.00076 |
Grade A, and why
threat-model 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Threat Model (A06:2025)
What this checks
This skill produces the threat-model context a developer needs before writing the code: what is this thing, where will it run, what inputs do we trust, what inputs do we not. It does not emit findings or apply a checklist of "missing controls" — that's the developer's job once they have the context.
Single source of truth: this skill delegates to the
threat-modeling subagent in .claude/agents/threat-modeling.md. The
subagent's JSON output is the canonical threat-model shape.
Vulnerable patterns
This is an orchestrator skill. The agent it dispatches has no
vulnerable-pattern catalog of its own — it produces context, and
later auditors (vulnerability-audit, design-review,
contract-audit) use that context to find code-level issues.
Procedure
Use the Agent tool to dispatch one threat-modeling subagent.
Pass it the plan, spec, or codebase under discussion. The subagent
returns a JSON object describing purpose, deployment, trusted
inputs, and untrusted inputs.
Render that JSON as a Markdown report for the developer. Do not show the raw JSON. The report shape:
## Threat Model — <one-line summary derived from purpose>
**Purpose.** <purpose>
**Deployment.** <deployment>
**Trusted inputs** (the maintainer controls these; auditors should
not flag content originating here):
- <category 1>
- <category 2>
- ...
**Untrusted inputs** (cross a trust boundary; every one needs an
explicit handling step in the plan — validation, rate limit,
authentication, etc.):
- <category 1>
- <category 2>
- ...
---
*Use this as the design checklist for what your plan must address.
The skill produced context; deciding which controls to add is
yours.*
The closing line is intentional — this skill does not enforce specific controls or emit findings. It surfaces the trust-boundary picture; the developer decides what to add (auth on new endpoints, rate limits on user-facing surface, validation on external-service responses, …).
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.
- 3d ago First seen · 90 lines · 78 tokens per session scan A 529840e2a262
threat-model is a skill published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 78 tokens to every session and 759 once invoked, about $0.0004 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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