Grim Prompter

Grim Prompter is an open source tool providing threat modeling workflows and analysis prompts for AI coding agents.

Grim Prompter provides 36 architecture workflows and 29 method and analysis prompts for AI coding agents like Claude Code and Codex. Users point their coding agent at a repository to generate structured threat models, covering trust boundaries, threats, controls, and proposed mitigations with file-and-line citations. It supports quick runs, full six-stage deep analyses, specific methods like STRIDE, and change reviews against JSON reports. The project runs locally on macOS or Linux shells and outputs markdown reports and JSON artifacts. It is created by Jim Manico and licensed under the MIT License.

Grim Prompter at a glance

Best for: Software engineer
Runs on: macOS, Linux, open source, CLI
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/jmanico/grim-prompter

Key features

36 architecture workflows
29 method and analysis prompts
Six-stage deep analysis workflow
Change review against JSON baselines
File-and-line citation tracking
JSON and Markdown output reports
AGENTS.md integration support

Use it for

Generate a quick threat model for an application repository
Run a full six-stage deep architectural analysis
Review how a code branch changes an existing threat model
Apply specific methods like STRIDE per element
Map tools to backend credentials and effective permissions

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