Quickstart

OpenNexus is a Rust CLI for bootstrapping, updating, and uninstalling context-driven project workflows

OpenNexus is a Rust CLI package (opennexus) centered on the opennexus command. It installs governance and workflow assets into your project, keeps command specs in sync, and gives teams a repeatable way to run context-driven development.

Start Here

Install the CLI:

cargo install opennexus

Initialize OpenNexus in your project root:

opennexus setup

After install + setup, your repository is prepared with Nexus assets as documented in the README:

.
├── .nexus/
│   ├── .version
│   ├── commands/
│   │   ├── nexus-0-prompt.md
│   │   ├── nexus-1.2-context-create.md
│   │   └── ...
│   ├── context/
│   │   ├── .extract-allowlist
│   │   ├── nexus/
│   │   ├── nexus-cli/
│   │   └── fumadocs/
│   ├── rules/
│   │   ├── context.md
│   │   ├── rs.md
│   │   └── ...
│   └── templates/
│       ├── PROJECT.md
│       ├── AGENTS.md
│       └── nexus/
└── .opencode/
    └── command/
        ├── nexus-0-prompt.md -> ../../.nexus/commands/nexus-0-prompt.md
        ├── nexus-1.2-context-create.md -> ../../.nexus/commands/nexus-1.2-context-create.md
        └── ...

If you are new to the workflow, read the Context Driven Development (CDD) guide for the specification model and project structure.

Core Commands

Command	What it does
`opennexus setup`	Installs/refreshes `.nexus` assets and `.opencode/command` links in the current repo
`opennexus update`	Upgrades the installed `opennexus` command to the latest published version
`opennexus uninstall`	Removes the globally installed `opennexus` command
`opennexus --help`	Shows available commands and options

Features

Slash Commands

OpenCode command-form workflows are documented in the Slash Commands catalog.

Slash Command	Purpose
`nexus-0-prompt`	Rewrites a user prompt for clarity/structure and returns only the rewritten prompt
`nexus-1.1-context-search`	Finds relevant Desired Outcomes and Next Actions from `.nexus/context/`
`nexus-1.2-context-create`	Creates new context specs from goals with correct IDs/prefixes and E2E-testable actions
`nexus-1.3-context-sync`	Produces an analysis-only Context Sync Report without editing files
`nexus-1.4-context-review`	Audits context quality, proposes fixes, and can suggest context splitting
`nexus-1.5-context-from-code`	Proposes candidate contexts or updates by analyzing code behavior
`nexus-2-investigate`	Runs 5 parallel analysts and consolidates severity-grouped findings
`nexus-3.5-critique`	Stress-tests a plan for risks, logic gaps, and edge cases
`nexus-4-code`	Orchestrates implementation tracks across parallel workstreams
`nexus-create-skill-from-codebase`	Orchestrates full/incremental `llms.txt` generation with quality gates

Skills

OpenNexus ships built-in skills under Skills -> Rust.

Rust

Skill	Purpose
`ratkit`	Operational guide for the ratkit Rust TUI ecosystem, feature flags, modules, and usage patterns
`opencode-rs-sdk`	Operational guide for OpenCode Rust SDK HTTP, SSE streaming, and managed server/client workflows

llms.txt Generation

OpenNexus can use AIs to generate a friendly llms.txt file that captures project knowledge in an agent-consumable format.

Generated llms.txt content can be converted into reusable skills.
This is the same workflow used to create .nexus/skills/ratkit/SKILL.md and .nexus/skills/opencode-rs-sdk/SKILL.md.
Use the slash-command workflow to iterate from project context to llms.txt, then from llms.txt to skill artifacts.