Is Authsignal agent-ready?

Authsignal scores Band C on The Headless Index. Its JAIRF rating is not available because no machine-readable spec was scored. Its strongest area for agent use is API-first design intent; its weakest is MCP and agent posture.

Does Authsignal publish an OpenAPI spec?

No published OpenAPI specification was found when Authsignal was scored. That caps its JAIRF dimensions and forces agents to rely on documentation or reverse engineering to operate it.

What is Authsignal's Headless Index score?

Authsignal scores 54/100 on the Headless Index thesis-fit rubric and sits in Band C in the Auth & Identity category. The score weighs API-first design, headless operation, MCP and agent posture, schema observability, and webhooks.

03 / Scorecard / Auth & Identity

Authsignal

Headless Index

54/100

JAIRF

N/A

Verified

AUG 20, 2026

Methodology v1 · JAIRF v1.0.0

Authsignal earns Band C in the Auth & Identity category of The Headless Index, with a thesis-fit score of 54/100. Its strongest dimension is API-first design intent (14/20); its weakest scored dimension is MCP and agent posture (4/20). No public OpenAPI specification was found when Authsignal was scored, which limits how far an agent can go without human integration work.

Editorial verdict

Authsignal is partially headless and partly UI-led. The Headless Index thesis-fit score of 54/100 puts it mid-table on 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 are partly machine-consumable: the core flows are reachable through code but several adjacent surfaces still expect a human at a dashboard, and the rest of this verdict explains where Authsignal lands inside that pattern. On the API surface, the question is whether the API is the product or a layer beneath the dashboard. Authsignal exposes a step-up MFA and risk-scoring REST API with bearer auth and SDKs across Node, Python, Go, .NET, Ruby, and Java. Drop-in product for existing auth stacks that need adaptive challenges. The API surface is narrow and well-shaped.^[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.authsignal.com; some surfaces reference OpenAPI but a single canonical URL is not prominent. Cold introspection requires docs context.^[2] An agent can drive parts of this product, but not all of it: integrators should plan for human-in-the-loop checkpoints where the headless surface stops short. On headless operability: The product is shaped to be consumed by other auth systems, so the API focuses on challenge enrollment, risk scoring, and step-up flow control. Tenant management sits behind the dashboard. Within the product scope, every flow is programmable.^[3] On the MCP and agent-integration axis, which is the fastest-moving criterion in the index: No first-party Authsignal MCP server. The product is too narrow for the protocol layer to be a meaningful axis.^[4] Event posture closes the loop: an agent that cannot react to state changes is reduced to polling. Outbound webhooks for risk events use HMAC signing. Catalog is purpose-built and well aligned with the product scope: enrolment events, challenge outcomes, risk score updates. Net assessment: integrators can build agent flows against Authsignal, but the rough edge to plan around is MCP posture^[5]. Expect to wrap missing pieces in bespoke glue or accept human-in-the-loop checkpoints. Workable but requires scaffolding.

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 intent14/20

scored

Authsignal exposes a step-up MFA and risk-scoring REST API with bearer auth and SDKs across Node, Python, Go, .NET, Ruby, and Java. Drop-in product for existing auth stacks that need adaptive challenges. The API surface is narrow and well-shaped.

signals (5)

+AI review appliedReviewer: Editorial review on 2026-05-20
−OpenAPI specNot found across 34 probe paths
·GraphQL endpointDiscovered at https://www.authsignal.com/graphql, introspection disabled or scoped
+SDKs maintained8 (dotnet, go, java, kotlin, python, swift, typescript); top by stars: authsignal/authsignal-browser (7 stars)
·npm weekly downloads4.5k across published packages; top: @authsignal/browser @ 2.9k/week

cite (1)

github.sdks@2026-05-20

Headless operation12/20

scored

The product is shaped to be consumed by other auth systems, so the API focuses on challenge enrollment, risk scoring, and step-up flow control. Tenant management sits behind the dashboard. Within the product scope, every flow is programmable.

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@2026-05-20

MCP & agent posture4/20

scored

No first-party Authsignal MCP server. The product is too narrow for the protocol layer to be a meaningful axis.

signals (4)

+AI review appliedReviewer: Editorial review on 2026-05-20
−Official MCP serverNone found in vendor's GitHub org or the official MCP registry
−Community MCP serversNone found
+Agent-friendly SDKs2 TS/JS SDKs available; top: @authsignal/browser (2.9k/week downloads)

cite (1)

mcp.found@2026-05-20

Schema observability12/20

scored

REST documented at docs.authsignal.com; some surfaces reference OpenAPI but a single canonical URL is not prominent. Cold introspection requires docs context.

signals (3)

+AI review appliedReviewer: Editorial review on 2026-05-20
−OpenAPINot discovered across 34 standard probe paths
·GraphQL introspectionGraphQL endpoint at https://www.authsignal.com/graphql but introspection is disabled, scoped, or behind authentication

cite (1)

openapi.discovered@2026-05-20

Webhooks & events12/20

scored

Outbound webhooks for risk events use HMAC signing. Catalog is purpose-built and well aligned with the product scope: enrolment events, challenge outcomes, risk score updates.

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)

ai_review_browser.webhooks@2026-05-20

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

Band rationale:C band: scores 40-75 range

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FAQ

Authsignal and agent readiness

Is Authsignal agent-ready?: Authsignal scores Band C on The Headless Index. Its JAIRF rating is not available because no machine-readable spec was scored. Its strongest area for agent use is API-first design intent; its weakest is MCP and agent posture.
Does Authsignal publish an OpenAPI spec?: No published OpenAPI specification was found when Authsignal was scored. That caps its JAIRF dimensions and forces agents to rely on documentation or reverse engineering to operate it.
What is Authsignal's Headless Index score?: Authsignal scores 54/100 on the Headless Index thesis-fit rubric and sits in Band C in the Auth & Identity category. The score weighs API-first design, headless operation, MCP and agent posture, schema observability, and webhooks.