Hessian

Hessian is a Y Combinator (Spring 2026) startup building a forward-deployed AI agent platform for automating business operations. Its engineers embed on-site to map real workflows, then build and operate custom AI agents on the Hessian platform to run those processes end-to-end — spanning sales proposals, financial reconciliation, data management, and internal-system synchronization. The platform surfaces workflows, task and agent orchestration, workers, queue groups, prompts, assets, artifacts, secrets, webhooks, and audit logging, with integrations for tools such as GitHub, Slack, Postgres, AWS, Docker, Kubernetes, OpenAI, and Claude. Hessian does not yet publish a public API, developer documentation, SDKs, or an OpenAPI definition; this profile captures its verifiable public identity and web properties while the developer surface is awaiting release.

Hessian is profiled on the APIs.io network. Tagged areas include Company, Artificial Intelligence, AI Agents, Automation, and Workflow Automation.

Hessian’s developer surface includes engineering blog and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

10.7/100 minimal ▬ flat Agent 0/100 human only Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

0 APIs

Company Artificial Intelligence AI Agents Automation Workflow Automation Y CombinatorForward Deployed

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 10.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.4 / 17

Access Clarity 5.1 / 17

Operational Transparency 0.5 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.1 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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 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

MCP Tool Quality 6 / 6

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/.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 2.4 — up to +19.5 composite points Ask about this →
Access Clarity scores 29.8 — up to +14.0 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/hessian/apis.yml: open an issue on github.com/api-evangelist/hessian 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 →

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Hessian

9 quoted statements, read from Hessian's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Hessian

20 quoted statements, read from Hessian's own page on 2026-11-09.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Hessian

4 quoted statements, read from Hessian's own page on 2026-11-09.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Hessian

1 quoted statement, read from Hessian's own page on 2026-11-09.

LICENSE

Security Posture 1

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

Hessian Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Other 2

Properties that don't map to a standard resource type

DataProcessing

DataProcessing

Eligibility

Eligibility

Source (apis.yml)

aid: hessian
name: Hessian
description: Hessian is a Y Combinator (Spring 2026) startup building a forward-deployed AI agent platform for automating
  business operations. Its engineers embed on-site to map real workflows, then build and operate custom AI agents on the Hessian
  platform to run those processes end-to-end — spanning sales proposals, financial reconciliation, data management, and internal-system
  synchronization. The platform surfaces workflows, task and agent orchestration, workers, queue groups, prompts, assets,
  artifacts, secrets, webhooks, and audit logging, with integrations for tools such as GitHub, Slack, Postgres, AWS, Docker,
  Kubernetes, OpenAI, and Claude. Hessian does not yet publish a public API, developer documentation, SDKs, or an OpenAPI
  definition; this profile captures its verifiable public identity and web properties while the developer surface is awaiting
  release.
url: https://raw.githubusercontent.com/api-evangelist/hessian/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-yc-batch: Spring 2026
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
image: https://hessian.sh/favicon.svg
tags:
- Company
- Artificial Intelligence
- AI Agents
- Automation
- Workflow Automation
- Y Combinator
- Forward Deployed
tags_raw:
- Company
- Artificial Intelligence
- AI Agents
- Automation
- Workflow Automation
- Operations
- Y Combinator
- Forward Deployed
- Workflow-Automation
apis: []
common:
- url: https://hessian.sh/blog/
  type: Blog
- type: Website
  url: https://hessian.sh
- type: GitHubOrganization
  url: https://github.com/hessianhq
- type: LinkedIn
  url: https://www.linkedin.com/company/hessianhq/
- type: TermsOfService
  url: https://hessian.sh/legal/terms
- type: PrivacyPolicy
  url: https://hessian.sh/legal/privacy
- type: DomainSecurity
  url: security/hessian-domain-security.yml
- type: UsageTerms
  url: terms/hessian-terms-of-service.yml
- type: DataProcessing
  url: privacy/hessian-privacy-policy.yml
- type: Eligibility
  url: eligibility/hessian-eligibility.yml
- type: DataLicense
  url: data-license/hessian-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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