Nia CLI - Context Layer for AI Coding Agents

TL;DR

TL;DR: Nia is an open source context layer that indexes your codebases and documentation so AI coding agents stop hallucinating and start answering questions about your actual code.

Source and Accuracy Notes

⚠️ This section is MANDATORY. All links must be verified from actual source, not guessed.

• Project page: trynia.ai — product landing page
• Source repository: github.com/nozomio-labs/nia-cli — README read in full; all commands verified
• License: Apache 2.0 (verified via LICENSE file in repo)
• Latest release: v0.0.11 (verified via git ls-remote --tags)
• HN launch thread: news.ycombinator.com/item?id=46194828

What Is Nia?

Nia is a context layer for AI coding agents. The core problem it solves: LLMs hallucinate when answering questions about codebases they have only briefly seen in a chat context. They paraphrase, guess at implementation details, and confidently produce wrong answers.

Nia solves this by maintaining a persistent, queryable index of your real codebases, documentation, and external data sources. When you ask an agent a question, it queries the Nia index first — getting precise, grounded answers from the actual code.

The project has two components:

• Nia Cloud — hosted API service at trynia.ai with a web dashboard
• nia-cli — the open source CLI that works with the Nia API, or can be self-hosted

The nia-cli is the open source piece covered in this post. It is built with Bun and published as an Apache 2.0 project.

Setup Workflow

Prerequisites

• Bun 1.0 or later
• A Nia API key (free tier available at trynia.ai)

Step 1: Install the CLI

# Using Bun
bun install

# Or install globally via npm
npm install -g nia-cli

Step 2: Authenticate

# Option 1: environment variable
export NIA_API_KEY=nia_your_api_key

# Option 2: store key in local config
nia auth login --api-key nia_your_api_key

# Check active auth source
nia auth status

Step 3: Index a Repository

# Index a public GitHub repository
nia repos index vercel/ai

# List all indexed repositories
nia repos list

# Index documentation sources
nia sources index https://docs.anthropic.com

# Add and sync a local folder
nia local add ~/dev/my-project
nia local sync
nia local watch

Step 4: Search

# Query your indexed sources
nia search query "How does auth middleware work?"

# Search the web
nia search web "latest OpenTelemetry collector changes" --category github

# Search only local folders
nia search query "Where is auth configured?" --local-folders my-project

Step 5: Autonomous Research

# Run autonomous research on a topic
nia oracle create "Compare RAG evaluation frameworks"

# Check account usage
nia usage

Architecture

nia-cli is structured as a modular command system built on Bun. The key subsystems are:

• Auth layer — supports env var (NIA_API_KEY) and local config storage
• Repository indexer — fetches and parses GitHub repos, documentation sites, and local directories
• Search engine — queries the Nia cloud API with category filters (github, web, local-folders)
• Oracle module — autonomous research agent that iterates on a query across multiple sources

The CLI delegates search and indexing to the Nia cloud API. All indexed data lives in the Nia cloud unless you use nia local commands for on-disk-only storage.

Development

# Run in dev mode
bun run dev

# Type-check
bun run check:types

# Run tests
bun run test

# Lint and static checks
bun run check

# Build standalone executable
bun run build

# Run built CLI
bun run start

FAQ

Q: Does nia-cli work offline? A: The nia local commands (add, sync, watch) store data locally. However, search queries still route through the Nia cloud API unless you are self-hosting the backend.

Q: How is this different from a vector database? A: Nia is not a vector store — it is a managed context layer that abstracts away chunking, embedding, and retrieval. You point it at a repo or doc URL and it handles the rest.

Q: Can I self-host the backend? A: The nia-cli source is open (Apache 2.0) but the self-hosted backend is not explicitly documented in the current README. Check the GitHub repo for any self-hosting guides.

Q: What models does Nia use? A: The README does not specify the underlying models. The product page describes it as a context layer rather than a model provider.

Q: Is there a free tier? A: Yes — trynia.ai offers a free tier. Pricing details are on the product page.

Conclusion

Nia addresses a real problem with AI coding agents: hallucination on code-specific questions. The nia-cli gives developers an open, scriptable way to index and query their actual codebase context. It is young (v0.0.11), Apache 2.0 licensed, and actively developed.

If you run agents against large or complex codebases, Nia is worth integrating into your workflow. Install it with bun install, point it at your key repos, and stop getting confident wrong answers from your coding assistant.