Grim Prompter

Promptfoo is an AI application security and evaluation platform for testing prompts, RAG systems, agents, models, and guardrails. It can run evaluation tests with LLM-judge scoring against defined criteria and verify citations against source documents; in the described payment-rules assistant, it was used to assess answer quality and investigate apparent regressions against the underlying evidence. Its security workflows simulate context-aware attacks, including prompt injection, jailbreaks, data leaks, business-rule violations, insecure agent tool use, and toxic-content generation, and can run in development and CI/CD workflows. Promptfoo also provides automated red teaming, code scanning, MCP security testing, remediation guidance, and continuous monitoring, with integrations for AI applications, agent frameworks, CI/CD systems, and on-premises or cloud deployments.

Prompt Audit is a Claude Code skill, also callable through the Claude API, that examines prompts, skills, and tools for outdated or conflicting practices. It identifies anti-patterns such as instructing a model to “think step by step,” unnecessary verification rituals, and contradictory rules, then removes those patterns. The videos describe it as a way to improve model performance and reduce usage costs.

System Prompts Leaks is an open reference archive of extracted AI system prompts, stored as Markdown files and organized by vendor. It collects prompts captured from chat assistants and coding agents—including Anthropic Claude, OpenAI ChatGPT and Codex, Google Gemini, xAI Grok, Cursor, Copilot, VS Code, and Perplexity—as well as officially published prompts for comparison. The repository is updated regularly and is intended for developers and researchers studying the hidden instructions and rules supplied to AI systems before user messages.

SlopMonster is a Python linter for detecting formulaic or suspicious AI-generated writing in HTML pages, Markdown, plain text, landing pages, READMEs, emails, and scripts. Its scorer checks AI-associated vocabulary, sentence constructions, punctuation cadence, rule-of-three rhythms, and unsupported sales claims, assigns a score out of 5, and can fail a build when copy scores below 5/5. Its workflow scores the draft, performs a three-pass rewrite that removes suspect vocabulary and sentence shapes and replaces them with specific copy, sends the draft to a different model family for cleansing, and scores the result again. The cleansing script can use a Codex or Claude CLI, refuses to route a draft back to its own model family, and prints a prompt when no supported rival CLI is available. A GitHub Actions workflow is included as a reusable build gate; the scorer itself uses only Python's standard library, while the cleansing step requires an external AI CLI or manual prompt handling. The repository also includes regression tests, a catalogue of detection rules, rewrite principles, and worked before-and-after examples. It is distributed under the MIT license and can also be installed as an agent skill for Claude Code or used by other agents through its plain-Markdown instructions.

Agent Skills is a curated skill registry and npm-based CLI for extending AI coding agents such as Claude Code, Cursor, Copilot, and Antigravity with packaged instructions, templates, and reference files. The CLI fetches a catalog, lets users search and select skills, caches downloads locally, and installs them to selected agents by copying or symlinking them at global or project scope; it also supports updating, removing, auditing, and managing cached skills. The repository describes the catalog as an open-source, human-curated library with CI static analysis, content hashing, lockfiles, path isolation, symlink guards, sanitization, audit logging, and Snyk Agent Scan checks. It also includes an MCP server that exposes progressive-disclosure tools for listing, searching, reading, and fetching skill files. The CLI source is MIT-licensed; maintainer-authored skills are generally CC BY 4.0, while third-party skills retain their own licenses.