Korso

Korso is a Los Angeles based company (Y Combinator Spring 2026) building tooling for the next generation of software. Its flagship open source product, Shepherd, is a coordination layer for AI coding agents: a Fastify + Postgres hub, a published stdio Model Context Protocol server (@korso/shepherd on npm), a shared zod wire contract, and a React dashboard (@korso/shepherd-ui). Shepherd lets a fleet of agents working across sessions, worktrees, and team members claim files, release claims, broadcast announcements, and refresh a shared workspace landscape so they stop producing merge conflicts and overwriting each other. The MCP surface exposes seven documented tools (work, done, announce, sync, link, unlink, decline). Korso also runs a beta Trading API over its own quantitative trading desk and Korso Research, an AI-native research workspace.

Korso is profiled on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Agents, MCP, and Developer Tools.

Korso’s developer surface includes authentication, changelog, documentation, API reference, getting-started guide, support, signup flow, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.4/100 thin ▬ flat Agent 3/100 human only Front door AI 3/6 light Heartbeat 55/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers 3 Agent Skills

Company Artificial Intelligence Agents MCP Developer Tools Open SourceAgent CoordinationY Combinator

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 30.4/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 10.8 / 17

Access Clarity 3.6 / 17

Operational Transparency 3.2 / 11

Contract Governance 1.9 / 10

Discoverability 4.7 / 9

Regulatory Posture 4.2 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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

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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 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
Access Clarity scores 21.1 — up to +15.8 composite points
Contract Governance scores 18.2 — up to +9.8 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/korso/apis.yml: open an issue on github.com/api-evangelist/korso 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 →

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.

Model Context Protocol (MCP)

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

MCP Servers 1

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

Shepherd MCP server

Shepherd is a coordination layer for AI coding agents. The MCP server is a thin stdio client that forwards agent tool calls to a Shepherd hub (Fastify + Postgres), letting a fle...

MCP SERVER

Agent Skills 3

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

Announce and message across a Shepherd workspace

AGENT SKILL

Coordinate agent work in a shared Shepherd workspace

AGENT SKILL

Opt a repository into or out of Shepherd coordination

AGENT SKILL

Security Posture 3

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

Korso Authentication

http · 3 schemes

SECURITY

Korso Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Korso Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

DataModel

Components

Conformance

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

Packages

Packages

SDKs

SDKs

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Access & Security 4

Authentication, authorization, and security posture

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

ChangeLog

ChangeLog

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: korso
name: Korso
description: 'Korso is a Los Angeles based company (Y Combinator Spring 2026) building tooling for the next generation of
  software. Its flagship open source product, Shepherd, is a coordination layer for AI coding agents: a Fastify + Postgres
  hub, a published stdio Model Context Protocol server (@korso/shepherd on npm), a shared zod wire contract, and a React dashboard
  (@korso/shepherd-ui). Shepherd lets a fleet of agents working across sessions, worktrees, and team members claim files,
  release claims, broadcast announcements, and refresh a shared workspace landscape so they stop producing merge conflicts
  and overwriting each other. The MCP surface exposes seven documented tools (work, done, announce, sync, link, unlink, decline).
  Korso also runs a beta Trading API over its own quantitative trading desk and Korso Research, an AI-native research workspace.'
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - korso-ai/shepherd
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://korsoai.com/docs/favicon.svg
url: https://raw.githubusercontent.com/api-evangelist/korso/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: profiled
x-tier-reason: enrichment-pipeline
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Artificial Intelligence
- Agents
- MCP
- Developer Tools
- Open Source
- Agent Coordination
- Y Combinator
tags_raw:
- Company
- Artificial Intelligence
- Agents
- Model Context Protocol
- Developer Tools
- Open Source
- Agent Coordination
- Y Combinator
- Open-Source
apis: []
common:
- type: IssueTracker
  url: https://github.com/Korso-AI/Shepherd/issues
- type: ContributionGuide
  url: https://github.com/Korso-AI/Shepherd/blob/main/CONTRIBUTING.md
- type: MCPServer
  name: Shepherd MCP server
  url: mcp/korso-mcp.yml
- type: Packages
  url: packages/korso-packages.yml
- type: SDKs
  url: packages/korso-packages.yml
- type: Authentication
  url: authentication/korso-authentication.yml
- type: Conventions
  url: conventions/korso-conventions.yml
- type: DataModel
  url: data-model/korso-data-model.yml
- type: Components
  url: components/korso-components.yml
- type: Conformance
  url: conformance/korso-conformance.yml
- type: Lifecycle
  url: lifecycle/korso-lifecycle.yml
- type: ChangeLog
  url: changelog/korso-changelog.yml
- type: ChangeLog
  name: Shepherd CHANGELOG
  url: https://github.com/Korso-AI/Shepherd/blob/main/CHANGELOG.md
- type: LLMsTxt
  url: llms/korso-llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: VulnerabilityDisclosure
  url: security/korso-vulnerability-disclosure.yml
- type: Security
  name: Shepherd security policy
  url: https://github.com/Korso-AI/Shepherd/blob/main/SECURITY.md
- type: DomainSecurity
  url: security/korso-domain-security.yml
- type: Website
  url: https://korsoai.com/
- type: DeveloperPortal
  url: https://korsoai.com/docs
- type: Documentation
  url: https://korsoai.com/docs
- type: APIReference
  url: https://korsoai.com/docs/mcp-tools/work
- type: GettingStarted
  url: https://korsoai.com/docs/quickstart
- type: Support
  url: mailto:support@korsoai.com
- type: GitHubOrganization
  url: https://github.com/Korso-AI
- type: SourceCode
  url: https://github.com/Korso-AI/Shepherd
- type: SignUp
  url: https://korsoai.com/login
- type: TermsOfService
  url: https://korsoai.com/terms
- type: PrivacyPolicy
  url: https://korsoai.com/privacy
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

Korso API — frequently asked questions

How do I authenticate with the Korso API?

Korso uses bearer-token authentication (http · 3 schemes). The details are profiled on APIs.io as Korso Authentication.

Does Korso have an MCP server?

Yes. APIs.io lists 1 MCP server for Korso: Shepherd is a coordination layer for AI coding agents. The MCP server is a thin stdio client that forwards agent tool calls to a Shepherd hub (Fastify + Postgres), letting a fleet of agents across ses

Is the Korso API ready for AI agents?

Korso has a Kin Score of 30.4 out of 100 (thin) and an Agent Readiness score of 3.4 (human-only), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

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