Codesignal

CodeSignal is a technical interview and skills-assessment platform used by companies to screen, interview, and upskill software engineers. Its developer surface includes a GraphQL API (companies, tests, test sessions, interviews, and interview templates), a versioned Learn REST API (OpenAPI 3.1) for organization members, skill sets, and learning progress, a webhook event API covering assessment, candidate, auditor, and live-interview workflows with HMAC-SHA256 signed deliveries, and an official remote MCP server that lets AI agents work with assessments, candidate sessions, and interviews. CodeSignal is backed by Menlo Ventures.

Codesignal publishes 3 API contracts indexed on the APIs.io network, including Organization API, and 2 more. Tagged areas include Company, Technical Interview, Skills Assessment, Hiring, and Recruiting.

The Codesignal catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Codesignal’s developer surface includes engineering blog, authentication, documentation, API reference, support, pricing, signup flow, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

56.9/100 strong ▲ 7.9 Agent 32/100 agent ready Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

AccessSelf serve

1 published contract 1 MCP Servers 3 Agent Skills

CompanyTechnical InterviewSkills Assessment Hiring RecruitingDeveloper SkillsAssessment Education GraphQL Webhook

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Human Capital Management

BC-300

Organization

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 56.9/100 · strong

Contract Quality 10.9 / 21

Developer Ergonomics 8.0 / 17

Access Clarity 15.7 / 17

Operational Transparency 4.4 / 11

Contract Governance 0.5 / 10

Discoverability 5.5 / 9

Regulatory Posture 6.8 / 15

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Education & Research regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 51.5 — up to +12.1 composite points
Contract Governance scores 4.5 — up to +11.5 composite points
Developer Ergonomics scores 47.0 — up to +10.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/codesignal/apis.yml: open an issue on github.com/api-evangelist/codesignal to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Education and Edtech	builds-on	50.1	-	-
HCM and Payroll Marketplaces (ADP, Workday, UKG, Paylocity)	builds-on	50.1	-	-
TX-RAMP Certified Cloud Products (Texas DIR)	builds-on	50.1	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

CodeSignal GraphQL API

Primary GraphQL API for companies, tests, test sessions, live interviews, and interview templates. Authenticated with an API key.

CodeSignal Webhook API

Outbound webhook events across assessment, candidate, auditor, and live-interview workflows. Deliveries are signed with HMAC-SHA256.

Codesignal Organization API

The Organization API from Codesignal — 5 operation(s) for organization.

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Codesignal Learn Public Organization API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Codesignal MCP Server

Official remote MCP server that lets AI agents work with CodeSignal assessments, candidate test sessions, and live interviews.

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Schedule and run a CodeSignal live interview

AGENT SKILL

Screen a candidate with a CodeSignal assessment

AGENT SKILL

Track organization learning progress via the Learn API

AGENT SKILL

Pricing Plans 2

Published pricing tiers and plan structures.

Codesignal Plans Pricing

11 plans

PLANS

Codesignal Price Estimates

0 plans

PLANS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Codesignal Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Codesignal Webhooks

ASYNCAPI

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Codesignal Learn Overlay

7 actions · servers · codesignal-learn-openapi.json

DERIVED

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Codesignal Authentication

oauth2 · 1 scheme

SECURITY

Codesignal Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Codesignal Vulnerability Disclosure

security.txt · contact published

SECURITY

Codesignal Trust Center

trust center published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Codesignal Scopes

1 scope · clientCredentials

1 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks

Conventions

ErrorCatalog

DataModel

Conformance

Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 4

The organization behind the API

Blog

BlogRSS

Blog

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: codesignal
name: Codesignal
description: CodeSignal is a technical interview and skills-assessment platform used by companies to screen, interview, and
  upskill software engineers. Its developer surface includes a GraphQL API (companies, tests, test sessions, interviews, and
  interview templates), a versioned Learn REST API (OpenAPI 3.1) for organization members, skill sets, and learning progress,
  a webhook event API covering assessment, candidate, auditor, and live-interview workflows with HMAC-SHA256 signed deliveries,
  and an official remote MCP server that lets AI agents work with assessments, candidate sessions, and interviews. CodeSignal
  is backed by Menlo Ventures.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://codesignal.com/wp-content/uploads/2022/12/codesignal-fallbck.jpg
url: https://raw.githubusercontent.com/api-evangelist/codesignal/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- menlo-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Technical Interview
- Skills Assessment
- Hiring
- Recruiting
- Developer Skills
- Assessment
- Education
- GraphQL
- Webhook
tags_raw:
- Company
- Technical Interview
- Skills Assessment
- Hiring
- Recruiting
- Developer Skills
- Assessment
- Education
- GraphQL
- Webhooks
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: CodeSignal GraphQL API
  description: Primary GraphQL API for companies, tests, test sessions, live interviews, and interview templates. Authenticated
    with an API key.
  humanURL: https://developer.codesignal.com/
  baseURL: https://app.codesignal.com/graphql
  properties:
  - type: GraphQL
    url: https://app.codesignal.com/graphql
  - type: Documentation
    url: https://codesignal.github.io/developer-docs/graphql/
- name: CodeSignal Webhook API
  description: Outbound webhook events across assessment, candidate, auditor, and live-interview workflows. Deliveries are
    signed with HMAC-SHA256.
  humanURL: https://developer.codesignal.com/
  baseURL: https://app.codesignal.com/client-dashboard/integrations/webhooks
  properties:
  - type: Webhooks
    url: asyncapi/codesignal-webhooks.yml
- aid: codesignal:codesignal-organization-api
  name: Codesignal Organization API
  description: The Organization API from Codesignal — 5 operation(s) for organization.
  humanURL: https://developer.codesignal.com/
  baseURL: https://codesignal.com/learn
  tags:
  - Organization
  properties:
  - type: OpenAPI
    url: openapi/codesignal-organization-api-openapi.yml
common:
- type: Plans
  url: plans/codesignal-plans-pricing.yml
- url: https://codesignal.com/blog/
  type: Blog
- url: https://codesignal.com/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/codesignal-capability-edges.yml
  name: Codesignal Business Capability Map
- type: MCPServer
  url: mcp/codesignal-mcp.yml
- type: Webhooks
  url: asyncapi/codesignal-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/codesignal-authentication.yml
- type: OAuthScopes
  url: scopes/codesignal-scopes.yml
- type: Conventions
  url: conventions/codesignal-conventions.yml
- type: ErrorCatalog
  url: errors/codesignal-problem-types.yml
- type: DataModel
  url: data-model/codesignal-data-model.yml
- type: Conformance
  url: conformance/codesignal-conformance.yml
- type: Lifecycle
  url: lifecycle/codesignal-lifecycle.yml
- type: StatusPage
  url: https://status.codesignal.com/
- type: Overlay
  url: overlays/codesignal-learn-overlay.yaml
- type: LLMsTxt
  url: llms/codesignal-llms.txt
- type: WellKnown
  url: well-known/codesignal-well-known.yml
- type: SecurityTxt
  url: well-known/codesignal-security.txt
- type: VulnerabilityDisclosure
  url: security/codesignal-vulnerability-disclosure.yml
- type: Security
  url: https://codesignal.com/security/disclosure-policy
- type: TrustCenter
  url: https://trust.codesignal.com/
- type: DomainSecurity
  url: security/codesignal-domain-security.yml
- type: DeveloperPortal
  url: https://developer.codesignal.com/
- type: Documentation
  url: https://developer.codesignal.com/
- type: APIReference
  url: https://codesignal.github.io/developer-docs/graphql/
- type: GitHubOrganization
  url: https://github.com/codesignal
- type: Support
  url: https://support.codesignal.com/
- type: Blog
  url: https://codesignal.com/blog
- type: Pricing
  url: https://codesignal.com/pricing
- type: SignUp
  url: https://app.codesignal.com/sign-up
- type: TermsOfService
  url: https://codesignal.com/terms
- type: PrivacyPolicy
  url: https://codesignal.com/privacy
- type: Website
  url: https://codesignal.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Codesignal API — frequently asked questions

Does Codesignal have an API?

Yes. APIs.io lists 3 APIs from Codesignal, including CodeSignal GraphQL API, CodeSignal Webhook API and Codesignal Organization API.

Is there an OpenAPI specification for the Codesignal API?

Yes. APIs.io indexes 1 OpenAPI specification for Codesignal, each linked for download from this page.

How do I authenticate with the Codesignal API?

Codesignal documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Codesignal Authentication.

How much does the Codesignal API cost?

APIs.io lists 11 pricing plans for Codesignal, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does Codesignal have an MCP server?

Yes. APIs.io lists 1 MCP server for Codesignal: Official remote MCP server that lets AI agents work with CodeSignal assessments, candidate test sessions, and live interviews.

Is the Codesignal API ready for AI agents?

Codesignal has a Kin Score of 56.9 out of 100 (strong) and an Agent Readiness score of 31.7 (agent-ready), scored by API Evangelist on 2026-10-31.

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