Emdash

Emdash (YC W26) is a free, open-source agentic development environment (ADE) built by General Action, Inc. in San Francisco. It lets engineering teams run multiple AI coding agents such as Claude Code and Codex in parallel, each isolated in its own git worktree so their work never collides, then compare, review diffs, and open pull requests from one desktop app. Emdash supports 25+ coding agent providers without vendor lock-in, schedules recurring agent work (bug sweeps, release prep, reviews), previews apps in a built-in browser, runs agents on remote machines over SSH, and manages a shared library of reusable prompts, skills, and MCP servers. It is a local-first desktop application (macOS, Windows, Linux) distributed as signed binaries and a Homebrew cask rather than a hosted web API; there is no public REST API surface. Not related to the em dash punctuation mark.

Emdash is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, AI Coding Agents, Agentic Development Environment, and Open Source.

Emdash’s developer surface includes documentation, getting-started guide, engineering blog, changelog, support, signup flow, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.0/100 emerging ▬ flat Agent 4/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyDeveloper ToolsAI Coding AgentsAgentic Development EnvironmentOpen SourceDesktop ApplicationDeveloper ProductivityGit WorktreesMCPY Combinator

Kin Score

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

Composite quality — 24.0/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 7.0 / 20

Commercial Clarity 6.8 / 20

Operational Transparency 3.4 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 4/100 · 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 4 / 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/emdash: 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 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Roadmap

ChangeLog

Support

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Source (apis.yml)

aid: emdash
name: Emdash
description: Emdash (YC W26) is a free, open-source agentic development environment (ADE) built by General Action, Inc. in
  San Francisco. It lets engineering teams run multiple AI coding agents such as Claude Code and Codex in parallel, each isolated
  in its own git worktree so their work never collides, then compare, review diffs, and open pull requests from one desktop
  app. Emdash supports 25+ coding agent providers without vendor lock-in, schedules recurring agent work (bug sweeps, release
  prep, reviews), previews apps in a built-in browser, runs agents on remote machines over SSH, and manages a shared library
  of reusable prompts, skills, and MCP servers. It is a local-first desktop application (macOS, Windows, Linux) distributed
  as signed binaries and a Homebrew cask rather than a hosted web API; there is no public REST API surface. Not related to
  the em dash punctuation mark.
url: https://raw.githubusercontent.com/api-evangelist/emdash/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
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
image: https://emdash.ai/opengraph-image.png
tags:
- Company
- Developer Tools
- AI Coding Agents
- Agentic Development Environment
- Open Source
- Desktop Application
- Developer Productivity
- Git Worktrees
- MCP
- Y Combinator
apis: []
common:
- type: Website
  url: https://emdash.ai
- type: DeveloperPortal
  url: https://emdash.ai/docs
- type: Documentation
  url: https://emdash.ai/docs
- type: GettingStarted
  url: https://emdash.ai/docs/installation.md
- type: Roadmap
  url: https://emdash.ai/docs/roadmap.md
- type: Blog
  url: https://emdash.ai/blog
- type: BlogRSS
  url: https://emdash.ai/blog/rss.xml
- type: ChangeLog
  url: https://emdash.ai/changelog
- type: GitHubOrganization
  url: https://github.com/generalaction
- type: SourceCode
  url: https://github.com/generalaction/emdash
- type: Support
  url: https://discord.com/invite/f2fv7YxuR2
- type: SignUp
  url: https://emdash.ai/download
- type: TermsOfService
  url: https://emdash.ai/terms
- type: PrivacyPolicy
  url: https://emdash.ai/privacy
- type: LLMsTxt
  url: llms/emdash-llms.txt
- type: Packages
  url: packages/emdash-packages.yml
- type: ChangeLog
  url: changelog/emdash-changelog.yml
  name: Emdash changelog (structured)
- type: WellKnown
  url: well-known/emdash-well-known.yml
- type: DomainSecurity
  url: security/emdash-domain-security.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