---
id: sdks.overview
title: Application SDKs
summary: Choose a server-side SDK and follow a complete Fieldloop submission and receipt example.
kind: reference
product_area: developer_tools
status: stable
updated: 2026-10-31
canonical: /docs/sdks
---

# Application SDKs

## Definition

Use an application SDK inside a backend service, worker or serverless function. Supply its API key through the deployed host's secret mechanism. These libraries do not install the CLI, open browser login, discover credentials or run a local evaluator.

## Choose a language

| Guide | Package identity | Runtime | Resources |
| --- | --- | --- | --- |
| [Python](/docs/sdks/python) | `teammately` | Python 3.10+ | Fieldloop |
| [JavaScript / TypeScript](/docs/sdks/typescript) | `@teammately/sdk` | Node.js 22+, ES modules | Fieldloop |
| [Go](/docs/sdks/go) | `github.com/teammately/teammately-go` | Go 1.25.1+ | Fieldloop and evaluation operations |

Each guide describes installation from a source checkout and a batch call. Resource coverage differs across languages. Use [REST](/docs/public-api) or the [CLI](/docs/cli) for evaluation workflows outside your language client's resource surface.

## Fields, states, or lifecycle rules

A new Fieldloop Submission key authorizes that capability across its workspace. The application supplies organization, Project and source identifiers; current server permissions apply. Older restricted keys retain their restrictions.

`source_event_id` and batch idempotency keys belong to your application. Project/source IDs and receipts are issued by Teammately. In-memory enqueue, durable admission and completed processing are different acknowledgements.

Read [Delivery and Recovery](/docs/sdks/delivery-and-recovery) before continuous ingestion. It covers immutable batches, retries, shutdown, row outcomes and privacy.

## Related task pages

{% related-card-grid %}
- [Python quickstart](/docs/sdks/python)
- [TypeScript quickstart](/docs/sdks/typescript)
- [Go quickstart](/docs/sdks/go)
- [Capture and Inspect Logs](/docs/fieldloop/ingest-logs)
{% /related-card-grid %}