Growthbook

The REST API covers features, experiments, data sources, metrics, and SDK connections. Feature flag management — creating, updating, and targeting rules — is the primary agent automation surface. Agents can toggle features for gradual rollouts, update targeting percentages, and retrieve experiment results for downstream analysis. The SDK connection API manages the feature flag payloads delivered to application clients.

Reliability for self-hosted GrowthBook is the team's operational responsibility. GrowthBook Cloud provides managed reliability. The feature flag delivery mechanism (SDK fetches feature payloads) is designed for reliability — flag payloads are cached client-side, so brief GrowthBook server unavailability doesn't immediately break feature flag behavior in production applications.

GrowthBook is an open-source feature flagging and experimentation platform that combines feature flag management with built-in A/B test analysis. The self-hostable architecture and open-source core make it a popular choice for teams that need full data ownership for experiment results. For agents in deployment automation, GrowthBook's API enables programmatic feature flag management — toggling features, managing targeting rules, and retrieving experiment results for analysis workflows.

Authentication uses API keys for REST API access. Self-hosted deployments manage their own credential infrastructure. Teams building agents on GrowthBook should use service account keys rather than personal account keys for production automation, and should implement appropriate key rotation practices.

Documentation is thorough and developer-friendly, reflecting the project's open-source engineering culture. The API reference, SDK documentation, and experimentation setup guides are well-written. Teams new to experimentation platforms should read the conceptual guides before the API reference to understand how features, experiments, and metrics relate to each other.