Coasts

Coasts (Containerized Hosts) is an open-source, MIT-licensed CLI tool that provides localhost service isolation and orchestration for git worktrees. It spawns multiple fully isolated development runtimes for the same project on a single machine, giving each worktree its own ports, databases, and services so parallel AI coding agents (Claude Code, Cursor, Codex, Conductor, and others) can build and test side by side without clashing. Built on Docker Compose, with a thin CLI client talking to a local coastd daemon over a unix socket plus a bundled React/Vite web observability UI, Coasts is local-first and offline-capable, with optional extension to remote machines over SSH. Backed by Y Combinator (Fall 2025) and founded by Jamie Sunderland and Dan Hyman.

Coasts is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, CLI, Git, and Containers.

Coasts’ developer surface includes documentation, getting-started guide, engineering blog, support, CLI, changelog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

17.8/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyDeveloper ToolsCLIGitContainersDockerLocal DevelopmentAI AgentsDeveloper ProductivityOpen SourceDevOps

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 17.8/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 8.3 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/coasts: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

CLI

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

Community

ChangeLog

Releases

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: coasts
name: Coasts
description: Coasts (Containerized Hosts) is an open-source, MIT-licensed CLI tool that provides localhost service isolation
  and orchestration for git worktrees. It spawns multiple fully isolated development runtimes for the same project on a single
  machine, giving each worktree its own ports, databases, and services so parallel AI coding agents (Claude Code, Cursor,
  Codex, Conductor, and others) can build and test side by side without clashing. Built on Docker Compose, with a thin CLI
  client talking to a local coastd daemon over a unix socket plus a bundled React/Vite web observability UI, Coasts is local-first
  and offline-capable, with optional extension to remote machines over SSH. Backed by Y Combinator (Fall 2025) and founded
  by Jamie Sunderland and Dan Hyman.
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://coasts.dev/coasts-og.png
url: https://raw.githubusercontent.com/api-evangelist/coasts/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
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Developer Tools
- CLI
- Git
- Containers
- Docker
- Local Development
- AI Agents
- Developer Productivity
- Open Source
- DevOps
apis: []
common:
- type: DomainSecurity
  url: security/coasts-domain-security.yml
- type: Website
  url: https://coasts.dev
- type: DeveloperPortal
  url: https://coasts.dev/docs
- type: Documentation
  url: https://coasts.dev/docs
- type: GettingStarted
  url: https://coasts.dev/docs/getting-started
- type: Blog
  url: https://coasts.dev/blog
- type: Support
  url: https://coasts.dev/contact
- type: Community
  name: Discord
  url: https://discord.gg/Nj87zwt7Kc
- type: GitHubOrganization
  url: https://github.com/coast-guard
- type: SourceCode
  url: https://github.com/coast-guard/coasts
- type: License
  name: MIT
  url: https://github.com/coast-guard/coasts/blob/main/LICENSE
- type: CLI
  url: cli/coasts-cli.yml
- type: ChangeLog
  url: changelog/coasts-changelog.yml
- type: Releases
  url: https://github.com/coast-guard/coasts/releases
- type: Packages
  url: packages/coasts-packages.yml
- type: LLMsTxt
  url: llms/coasts-llms.txt
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