Open Souls

Open Souls is an open-source framework and philosophy for building "AI souls" — agentic, embodied digital beings with personality, drive, and ego, built on top of large language models. The Soul Engine framework (distributed as the soul-engine npm package and CLI) models agency, memory, emotion, and goal-setting through WorkingMemory, cognitiveSteps, and MentalProcesses abstractions, describing itself as "NextJS + Vercel for the minds of digital beings." The project is now legacy: the opensouls.org site is parked and the hosted Soul Engine cloud service is no longer operating, but the open-source framework and npm packages remain published under the opensouls GitHub organization. Open Souls was surfaced as a portfolio company of a16z and added to the API Evangelist network.

Open Souls is profiled on the APIs.io network. Tagged areas include Company, AI Agents, LLM, Agent Framework, and AI Souls.

Open Souls’ developer surface includes CLI and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub

10.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-28 · rubric v0.5

0 APIs

CompanyAI AgentsLLMAgent FrameworkAI SoulsOpen SourceDeveloper Tools

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.5

Composite quality — 10.0/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 2.6 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 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/open-souls: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Resources

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

CLI

Source (apis.yml)

aid: open-souls
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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/open-souls.png
name: Open Souls
description: 'Open Souls is an open-source framework and philosophy for building "AI souls" — agentic, embodied digital beings
  with personality, drive, and ego, built on top of large language models. The Soul Engine framework (distributed as the soul-engine
  npm package and CLI) models agency, memory, emotion, and goal-setting through WorkingMemory, cognitiveSteps, and MentalProcesses
  abstractions, describing itself as "NextJS + Vercel for the minds of digital beings." The project is now legacy: the opensouls.org
  site is parked and the hosted Soul Engine cloud service is no longer operating, but the open-source framework and npm packages
  remain published under the opensouls GitHub organization. Open Souls was surfaced as a portfolio company of a16z and added
  to the API Evangelist network.'
url: https://raw.githubusercontent.com/api-evangelist/open-souls/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 2
  pass: local-v1
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- AI Agents
- LLM
- Agent Framework
- AI Souls
- Open Source
- Developer Tools
apis: []
common:
- type: GitHubOrganization
  url: https://github.com/opensouls
- type: SourceCode
  url: https://github.com/opensouls/opensouls
- type: Packages
  url: packages/open-souls-packages.yml
- type: SDKs
  url: packages/open-souls-packages.yml
- type: CLI
  url: cli/open-souls-cli.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io