$HEADLESS SYSTEMS
03 / Scorecard / Feature Flags & Config

GrowthBook

B
Headless Index
74/100
JAIRF
N/A
Verified
MAY 21, 2026
Methodology v1 · JAIRF v1.0.0

Powered by JAIRF v1.0.0 by Jentic · open methodology at /the-headless-index/methodology

Editorial verdict
GrowthBook is solidly built for programmatic consumption. The Headless Index thesis-fit score of 74/100 lands it in the upper-middle of the index, and JAIRF is recorded as N/A for this vendor because no public OpenAPI specification was reachable for the open-source scorer. In practice, vendors at this tier ship most of the primitives agents need, with one or two surfaces still leaning on documentation rather than discovery, and the rest of this verdict explains where GrowthBook lands inside that pattern. On the API surface, the question is whether the API is the product or a layer beneath the dashboard. GrowthBook is open-source feature flags plus experimentation. REST API plus SDKs in JavaScript, Node, Python, Ruby, PHP, Java, Go, .NET, Swift, Kotlin, Flutter, and React. The product combines flag management with statistical experiment analysis.[1] Schema observability is the related test: can an agent introspect the contract from cold, or does it have to read prose documentation to do so? REST documented at docs.growthbook.io. The open-source codebase exposes the contract. Schema discoverability is reference-class.[2] An agent can drive this product across most practical workflows, with a handful of edges where documentation reading still beats schema discovery. On headless operability: Features, experiments, segments, organisations, projects, and SDK Webhooks are all programmable. The growthbook CLI plus Docker plus Helm chart give deployment paths. Self-host plus GrowthBook Cloud share the API.[3] On the MCP and agent-integration axis, which is the fastest-moving criterion in the index: No first-party GrowthBook MCP server has been published yet. The developer-friendly open-source positioning would make MCP integration tractable.[4] Event posture closes the loop: an agent that cannot react to state changes is reduced to polling. GrowthBook SDK Webhooks deliver feature evaluation cache invalidation events with HMAC signing. Catalog covers flag-change automation. Net assessment: GrowthBook can be operated by agents for the majority of practical workflows. The closest thing to a gap is MCP posture[5], which integrators should sanity-check against their own use case before committing. Strong fit for agent-driven use cases.
Verdict by Headless Index pipeline (auto)
// AI-drafted from the evidence layer. Editorial review pending.
Scores

Scorecard detail

Headless Index · 5 sub-criteria
API-first design intent18/20
scored

GrowthBook is open-source feature flags plus experimentation. REST API plus SDKs in JavaScript, Node, Python, Ruby, PHP, Java, Go, .NET, Swift, Kotlin, Flutter, and React. The product combines flag management with statistical experiment analysis.

signals (6)
  • +AI review appliedReviewer: Editorial review on 2026-05-20
  • −OpenAPI specNot found across 34 probe paths
  • ·GraphQL endpointDiscovered at https://www.growthbook.io/graphql, introspection disabled or scoped
  • +SDKs maintained11 (dotnet, go, java, javascript, kotlin, ruby, rust, swift, typescript); top by stars: growthbook/growthbook-kotlin (29 stars)
  • +SDK recency4 of 11 SDK repos pushed within 30 days (most recent SDK commit: 2026-05-15)
  • −npm weekly downloadsNo published npm package detected for the JS/TS SDKs
cite (1)
  • github.sdks@2026-05-19
Headless operation16/20
scored

Features, experiments, segments, organisations, projects, and SDK Webhooks are all programmable. The growthbook CLI plus Docker plus Helm chart give deployment paths. Self-host plus GrowthBook Cloud share the API.

signals (9)
  • +AI review appliedReviewer: Editorial review on 2026-05-20
  • −API operations exposedNo OpenAPI spec; operations count unknown
  • ·Docs pages crawled0 pages (crawler: none)
  • ·Auth schemes documentedAuth documentation page not reached by crawler
  • ·Setup / quickstart docsNot reached by crawler
  • ·Billing docsNot reached by crawler
  • ·Teams / org docsNot reached by crawler
  • ·CLI docsNot reached by crawler
  • ·Schema / data model docsNot reached by crawler
cite (1)
  • github.sdks@2026-05-19
MCP & agent posture12/20
scored

No first-party GrowthBook MCP server has been published yet. The developer-friendly open-source positioning would make MCP integration tractable.

signals (4)
  • +AI review appliedReviewer: Editorial review on 2026-05-20
  • +Official MCP serverhttps://github.com/growthbook/growthbook-mcp (22 stars, last commit 12 days ago)
  • −Community MCP serversNone found
  • +Agent-friendly SDKs3 TS/JS SDKs available; top: growthbook/js-sdk-contrib
cite (1)
  • github.sdks@2026-05-19
Schema observability14/20
scored

REST documented at docs.growthbook.io. The open-source codebase exposes the contract. Schema discoverability is reference-class.

signals (3)
  • +AI review appliedReviewer: Editorial review on 2026-05-20
  • −OpenAPINot discovered across 34 standard probe paths
  • ·GraphQL introspectionGraphQL endpoint at https://www.growthbook.io/graphql but introspection is disabled, scoped, or behind authentication
cite (1)
  • github.sdks@2026-05-19
Webhooks & events14/20
scored

GrowthBook SDK Webhooks deliver feature evaluation cache invalidation events with HMAC signing. Catalog covers flag-change automation.

signals (2)
  • +AI review appliedReviewer: Editorial review on 2026-05-20
  • ·Webhook docs pageNot reached by crawler within budget (0 pages crawled). Cannot confirm whether vendor offers webhooks.
cite (1)
  • github.sdks@2026-05-19
JAIRF · 6 dimensions
JAIRF · N/A

This vendor does not publish a public OpenAPI specification. JAIRF cannot be computed. The Headless Index score and editorial verdict carry the readiness assessment.

No public OpenAPI specification discovered during collection

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Band rationale:B band: JAIRF=N/A HeadlessIndex=74

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