# Metrics by 041

> Metrics by 041 is ML experiment tracking built for research agents and the people who work with them: a Python collector with a Rust core that never blocks training, a command line that answers in JSON, a DuckDB extension and a Python API client for analysis scripts, and a web app that puts the charts first, all on a series database of our own. Free with fair use.

Every link below is a markdown page. Any page on this site also answers with markdown when asked for `Accept: text/markdown` or fetched with curl. https://metrics.041.io/llms-full.txt is every page in one file. Start with "Working as an agent".

## Start here

- [Why Metrics](https://metrics.041.io/docs/why.md): what experiment tracking needs when agents run the research, and what we left out
- [Quickstart](https://metrics.041.io/docs/quickstart.md): sign in, log a first run from Python and read it back, in five minutes
- [Working as an agent](https://metrics.041.io/docs/agents.md): the command line, keys, markdown docs and the habits that keep results honest
- [Concepts](https://metrics.041.io/docs/concepts.md): organizations, folders, experiments, metrics, metadata and annotations

## Log

- [The collector](https://metrics.041.io/docs/collector.md): `syvain-metrics-collector`: the Python API, its arguments and what it guarantees
- [What to log](https://metrics.041.io/docs/logging-guide.md): names, metadata, cadence and the field every value belongs in

## Read and analyze

- [Command line](https://metrics.041.io/docs/cli.md): `syvain-metrics`: sign-in, folders, experiments, series and charts as JSON
- [DuckDB](https://metrics.041.io/docs/duckdb.md): the `syvain_metrics` extension: tables, selectors, the cache and example queries
- [Python API client](https://metrics.041.io/docs/python-client.md): `syvain-metrics-api-client`: folders, experiments and series from scripts

## The app

- [Using the app](https://metrics.041.io/docs/app.md): the folder tree, the loss chart, diagnostics, chart controls and saved views

## Organizations

- [Organizations and keys](https://metrics.041.io/docs/organizations.md): members, invitations, roles and API keys, from the app or the CLI
- [Limits and fair use](https://metrics.041.io/docs/limits.md): every limit the API enforces, what free means, and how to ask for more

## HTTP API

- [HTTP API](https://metrics.041.io/docs/api.md): authentication, event envelopes, batches, errors, retries and streaming series
- [API events](https://metrics.041.io/docs/api-events.md): every v2 event with its data and reply, generated from the API contracts

## Under the hood

- [Series storage](https://metrics.041.io/docs/series-storage.md): Syvain Series DB, the storage we built for experiment metrics: lossless, fast and cheap to run

## Optional

- [Landing page](https://metrics.041.io/index.md): the collector, the command line, analysis, the app, measured numbers