Nebo

AI agents and humans are welcome here.

A modern, local-first logging SDK for multi-modal experiment data built for humans and AI agents.

pip install nebo

Documentation  ·  Examples  ·  Issues

Why Nebo?

Nebo is a lightweight, multi-modal logging tool designed for humans and AI agents. Nebo agent skills are released with every version and can be installed with

nebo skills install

allowing coding agents to understand the SDK, monitor the logs, and author its own logs. Nebo allows for fully autonomous experiments with your favorite coding agent.

Nebo is also local-first, so you don’t need to start another separate service, or worse, create an account to log data. Each run is simply stored in one .nebo file and can be managed into a tree of groups.

You can also deploy Nebo as a remote service, visit the web UI from your mobile device, and watch live metrics away from your desk since the UI is mobile-friendly.

Nebo offers function-level logging capturing data at the granularity of individual functions, so you can monitor inputs, outputs, and execution flow of your code.

These features enable observability and the autonomous development of such applications types:

• ML training
• DAG-structured data-processing pipelines
• Model chaining applications

Features

• 🏠 Local-first and free, cloud/remote-hosting optional
• 📱 Mobile-first web UI
• 🤖 AI-native integration with fully interoperable CLI, agent skills, and MCP
• 📝 Captured log types: text, metrics, images, audio, md, progress
• 🎚️ Data scrubbing between time/steps
• 🕸️ Function-level logging that automatically infers a DAG from your call graph
• 🧩 HTML embedding with iframes of many UI components: runs, DAG nodes, charts, media
• 📓 Notebook embedding via nb.show() delivering a Jupyter-friendly iframe of any slice of a run
• 🤗 One-command deploy to a Hugging Face Space via nebo deploy with public/private modes
• 🌳 Automatically organize runs into a tree with groups
• 📄 One easily managable append-only file per run
• ⚡ SQLite caching for fast queries and memory budget
• 🔌 Wandb drop-in replacement

Demo projects

Three real-world, CPU-only demo projects live in demos/: a CIFAR-10 training sweep, a night-sky source-extraction pipeline (every image-label kind on real survey tiles), and an LLM summarize-and-judge chain with an agent analysis playbook.

Installation

It's recommended to install nebo with uv:

uv pip install nebo

And highly recommended to install the agent skills released in each version:

uv run nebo skills install

Usage

A simple hello world program

import nebo as nb

nb.log_text("greeting", "Hello world!")

Track your training experiment

import torch
import nebo as nb

nb.start_run(name="v1", group="mnist/classify")  # run v1 in group mnist/classify
Y = torch.randn(100, 4)
for batch in nb.track(Y):  # progress tracking
    loss = torch.rand(())
    acc = torch.rand(())

    nb.log_line("loss", loss)  # tensors accepted directly
    nb.log_line("acc", acc)

Drop-in wandb replacement

Easily transfer from wandb by changing one import:

import nebo.wandb as wandb # <- change from import wandb

wandb.init(project="mnist", name="run-1", config={"lr": 1e-3})

for epoch in range(10):
    loss, acc = train_epoch()
    wandb.log({"loss": loss, "accuracy": acc})

wandb.finish()

Values are dispatched by type: numbers become line charts, numpy/PIL images become image streams, and everything else lands as text. wandb.config reads/writes work too (forwarded to nb.log_cfg). The shim covers the common surface — init, log, finish, config, run — not artifacts, sweeps, or watch.

Start the Daemon and View the UI

By default, runs land in ./.nebo/ as a single append-only file. To watch it live (or browse it later), start the daemon and open the web UI:

nebo serve

And navigate to http://localhost:7861.

Data Pipelines and DAGs

Decorate the functions you care about and log from anywhere — no nb.init(), no account, no service to stand up first:

import nebo as nb

@nb.fn()
def prepare():
    nb.log_text("status", "loaded 3 items")
    return [1, 2, 3]

@nb.fn()
def train(data):
    for x in data:
        nb.log_line("loss", 1.0 / x)
    return "model"

train(prepare())

The DAG view shows prepare → train inferred from the call graph with each function's text, metrics, images, and audio attached to its node.

Deploy to Hugging Face Spaces

[!WARNING] Hugging Face recently restricted Docker spaces from being free, so now, deploying nebo to HF Spaces requires a PRO account.

Nebo offers a native integration with Hugging Face spaces, which is a great way to share your logs or watch your experiments, remotely on a mobile device.

pip install nebo[deploy]
nebo deploy --space-id <owner>/<name>

One command creates (or updates) the Space, uploads the daemon image, sets a generated NEBO_API_TOKEN as a Space secret, and waits for the build to report healthy. By default the UI is publicly viewable while writes require the token. You can configure visibility with --read public|private and --write public|private, or hide the entire Space with --private.

The deploy prints everything needed to connect, including the API token. Set those as environment variables:

export NEBO_URI=https://<owner>-<name>.hf.space    # SDK: runs stream to the Space
export NEBO_API_TOKEN=nb_...                       # required for writes

Or connect with the SDK:

import nebo as nb

nb.init(uri="https://<owner>-<name>.hf.space", api_token="nb_...")

Or simply tell your agent to deploy your logs to HF Spaces.

Then, you can embed your logs with iframes

In addition to viewing your logs at https://<owner>-<name>.hf.space, you can embed certain UI components into any web page:

<iframe src="https://<owner>-<name>.hf.space/?run=<run_id>&metric=loss" width="100%" height="500"></iframe>

The slice is inferred from the query params — every embeddable component and its URL format:

Modifiers, composable with any row:

• &node=<function> — filter a panel/gallery slice to one function (accepts the loggable id or the bare function name).
• &token=<token> — authenticate against a token-protected daemon; the UI captures it once into localStorage and strips it from the visible URL.
• Phone-width iframes automatically render the mobile layout.

Architecture

graph LR
    A[Your Python Pipeline] --> B[Nebo SDK<br>@fn, log_text, track, ...]
    B --> C[Daemon Server<br>FastAPI, port 7861]
    B --> D[Terminal Dashboard<br>Rich]
    C --> E[CLI<br>nebo]
    C --> F[MCP Tools<br>Claude]
    C --> G[Web UI]

Two execution modes:

• Local mode (default): In-process only. No daemon needed.
• Server mode: Events stream to a persistent daemon via HTTP. Use nebo serve to start the daemon.

The daemon can run on your laptop, in CI, or on a Hugging Face Space (nebo deploy). The same SDK code works against any of them — set NEBO_CLI_URL and NEBO_API_TOKEN to point at the target. When the daemon enforces auth, every API request must carry the token via the X-Nebo-Token header (HTTP) or the ?token=… query param (browsers / WebSocket).