Show HN: Install Cursor rules and Claude agents like NPM packages (promptpm.dev)

A new developer tool demonstrated on Hacker News lets you install Cursor rules and Anthropic Claude agents the same way you install JavaScript libraries—via npm-like commands. After globally installing the CLI with npm, you can add rule or agent "packages" directly from URLs; the tool automatically places files into .cursor/rules/ or .claude/agents/ in your project, scans the repo to discover and register existing rule/agent files, and provides simple CLI commands to list or remove installed packages. This is significant because it treats reusable AI components (task rules and autonomous agents) as first-class, shareable dependencies, streamlining discovery, versioning and onboarding for AI/ML development workflows. Technically it standardizes where assets live (.cursor/.claude directories), supports remote package sourcing, and maintains a registry-like mapping so projects can declaratively consume rule and agent artifacts. Implications include faster prototyping and team collaboration, easier reuse of agent behaviors, and closer integration of agent artifacts into CI and dependency management—but it also raises provenance, security, and trust considerations for running third-party agent code pulled from URLs. Overall, it’s a lightweight package-management pattern that could accelerate modular agent ecosystems if coupled with good versioning and vetting practices.