What is fettle-threat-model?

A command that creates a STRIDE threat model for a service. STRIDE is a security checklist covering spoofing, tampering, repudiation, information disclosure, denial of service, and elevation of privilege.

Use it to generate a threat-model document, inspect automatically detected service components, and work through threats with human confirmation.

It provides a starting inventory of entry points, data stores, and authentication mechanisms so security risks can be reviewed systematically.

How MilindGaharwar/fettle configures Claude Code and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to MilindGaharwar/fettle. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/MilindGaharwar/fettle/main/.opencode/commands/fettle-threat-model.md

Clone the repo

git clone --depth 1 https://github.com/MilindGaharwar/fettle

Made for: Claude Code, OpenCode.

Or install fettle, the plugin that ships this one along with the rest of its 34 commands, 4 hooks.

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-threat-model.svg)](https://agentmods.dev/commands/milindgaharwar/fettle/fettle-threat-model)

Your own site

<a href="https://agentmods.dev/commands/milindgaharwar/fettle/fettle-threat-model"><img src="https://agentmods.dev/badge/commands/milindgaharwar/fettle/fettle-threat-model.svg" alt="Measured on agentmods" height="20"></a>

Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 239 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.

Model	Per session	Once invoked
Fable 5.1	$0.00016	$0.00239
Opus 5	$0.00008	$0.00120
Sonnet 5	$0.00003	$0.00048
Haiku 4.5	$0.00002	$0.00024

Measured 6d ago against content hash 6e07c592eb1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

fettle-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 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

threat-model — 89% identical, 9 lines differ

.opencode/commands/fettle-threat-model.md · 30 lines

What it actually says

$ARGUMENTS refers to any text the user typed after the slash command.

Generate a threat model for the target service.

Procedure

Determine service name. Use $ARGUMENTS if provided, otherwise derive from the workspace directory name.

Run the generator:

python3 -m fettle.threat_model --name SERVICE --root . --output docs/threat-model-SERVICE.md

Present the auto-detected data (entry points, data stores, auth mechanisms) and ask the user to confirm or add missing items.
Help fill STRIDE tables by analyzing the detected components and suggesting threats for each category.
Save the completed model to docs/threat-model-{name}.md.

Notes

Auto-detection is best-effort (grep-based), NOT comprehensive
The STRIDE tables require human judgment to fill
This is a guided template, not a replacement for a security architect

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.

6d ago First seen · 30 lines · 16 tokens per session scan A 6e07c592eb1b

Subscribe to this mod's changes

fettle-threat-model is a command published in the GitHub repository MilindGaharwar/fettle (2 stars, last pushed 3d ago), licensed Apache-2.0. It adds 16 tokens to every session and 239 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 2026-08-31.

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fettle: Command for Claude Code