Windmill

Windmill provides an AI‑powered performance management platform that automates reviews, 1‑on‑1 agendas, onboarding, continuous feedback and calibration. It helps modern teams run faster, achieve higher employee satisfaction and gain data‑driven insights, with integrations for Slack, Jira, Notion and more. The service targets HR and people‑ops professionals seeking to modernize performance reviews with AI.

Windmill is listed with 1 API on the APIs.io network. Tagged areas include Company, AI, Performance-Management, HRTech, and SaaS.

Windmill’s developer surface includes changelog, getting-started guide, pricing, engineering blog, support, and 12 more developer resources.

🌐 Visit website📡 Profile data on GitHub
28.1/100 thin Agent 30/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
1 API
CompanyAIPerformance-ManagementHRTechSaaS

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 28.1/100 · thin
Contract Quality 0.0 / 21
Developer Ergonomics 3.2 / 17
Access Clarity 10.7 / 17
Operational Transparency 4.7 / 11
Contract Governance 0.0 / 10
Discoverability 4.9 / 9
Regulatory Posture 2.7 / 15
Agent readiness — 30/100 · agent ready
Machine-Readable Contract 0 / 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 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 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 Horizontal (data, software, accessibility, platform) 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/.
Show this score on your site. Kin Score badge preview for Windmill It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/gowindmill-com/"><img src="https://apis.io/badge/gowindmill-com/card.svg" alt="Windmill on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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)
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
  • 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
6 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/gowindmill-com/apis.yml: open an issue on github.com/api-evangelist/gowindmill-com 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 →

APIs 1

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

Windmill API

Programmatic access to Windmill performance management features.

Pricing Plans 1

Published pricing tiers and plan structures.

Gowindmill Com Plans Pricing

3 plans

PLANS

Security Posture 1

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

Gowindmill Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Access & Security 2

Authentication, authorization, and security posture

Security
Security
 DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog
ChangeLog
 Support
Support
 StatusPage
StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 3

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: gowindmill-com
name: Windmill
image: https://gowindmill.com/index.png/
description: Windmill provides an AI‑powered performance management platform that automates reviews, 1‑on‑1 agendas, onboarding,
  continuous feedback and calibration. It helps modern teams run faster, achieve higher employee satisfaction and gain data‑driven
  insights, with integrations for Slack, Jira, Notion and more. The service targets HR and people‑ops professionals seeking
  to modernize performance reviews with AI.
url: https://artifacts.apis.io/gowindmill-com/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- Company
- AI
- Performance-Management
- HRTech
- SaaS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/gowindmill-com-plans-pricing.yml
- type: LLMsTxt
  url: llms/gowindmill-com-llms.txt
- type: AgentCard
  url: a2a/gowindmill-com-a2a.yml
- type: WellKnown
  url: well-known/gowindmill-com-well-known.yml
- type: Hosts
  url: hosts/gowindmill-com-hosts.yml
- type: Vendors
  url: vendors/gowindmill-com-vendors.yml
- type: Security
  url: https://help.gowindmill.com/security/pii
- type: ChangeLog
  url: https://help.gowindmill.com/changelog
- type: GettingStarted
  url: https://help.gowindmill.com/getting-started/initial-setup
- type: DomainSecurity
  url: security/gowindmill-com-domain-security.yml
- type: Website
  url: https://gowindmill.com/
- type: Pricing
  url: https://gowindmill.com/pricing/
- type: Blog
  url: https://gowindmill.com/blog/
- type: Support
  url: https://help.gowindmill.com/
- type: StatusPage
  url: https://status.gowindmill.com/
- type: TermsOfService
  url: https://gowindmill.com/legal/terms-of-service/
- type: PrivacyPolicy
  url: https://gowindmill.com/legal/privacy-policy/
apis:
- name: Windmill API
  description: Programmatic access to Windmill performance management features.
  humanURL: https://help.gowindmill.com/getting-started/initial-setup
  aid: gowindmill-com:windmill-api
x-backed-by:
- founder-collective
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation pages are served as markdown via llms.txt but no machine‑readable OpenAPI spec is available.
  evidence:
  - url: https://help.gowindmill.com/llms.txt
    status: 200
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Windmill API — frequently asked questions

Does Windmill have an API?

Yes. APIs.io lists 1 API from Windmill, including Windmill API.

How much does the Windmill API cost?

APIs.io lists 3 pricing plans for Windmill, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Windmill API ready for AI agents?

Windmill has a Kin Score of 28.1 out of 100 (thin) and an Agent Readiness score of 30.4 (agent-ready), scored by API Evangelist on 2026-10-31.

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