Plugin

An index and topic collection covering plugin, extension, and add-on architectures with public APIs and marketplaces. This collection spans editor and IDE plugin ecosystems (VS Code Marketplace, JetBrains Marketplace, Chrome Web Store, Firefox Add-ons), SaaS platform extension marketplaces (Atlassian Marketplace and Forge, Salesforce AppExchange, Shopify App Store, WordPress Plugins, Slack Apps, Discord Apps, Microsoft AppSource, Google Workspace Marketplace, Notion, Postman, Figma, Sketch, Webflow Apps, HubSpot Marketplace, Zapier App Directory), API gateway plugin frameworks (Kong Plugin Hub, Tyk Plugins, Gravitee Plugins), identity extensibility (Auth0 Actions and Extensions), and AI plugin and tool ecosystems (Open WebUI Functions, ChatGPT Plugins and GPTs, Claude Code plugins, OpenAI tools). It tracks the manifests, listing schemas, install and entitlement flows, extension points, and review and distribution APIs that power modern plugin and extension marketplaces.

Plugin is profiled on the APIs.io network. Tagged areas include Plugins, Extension, Marketplace, App Directory, and Addon.

The Plugin catalog on APIs.io includes 1 JSON-LD context.

Plugin’s developer surface includes developer portal and 1 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

9.6/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

0 APIs 7 Features 7 Use Cases

Plugins Extension MarketplaceApp DirectoryAddon

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 9.6/100 · minimal

Contract Quality 3.1 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.7 / 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

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/plugin/"><img src="https://apis.io/badge/plugin/card.svg" alt="Plugin on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

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 github.com/api-evangelist/plugin: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Features 7

Notable capabilities this provider offers.

Plugin Manifests

Marketplaces and runtimes use declarative manifests (manifest.json for Chrome and VS Code, plugin.xml for JetBrains, app manifests for Slack and Atlassian Connect) to describe i...

Marketplace Listing and Discovery APIs

Public APIs and search endpoints expose listings, categories, ratings, and download counts so developers and users can discover plugins across VS Code Marketplace, Chrome Web St...

Extension Points and Hooks

Host platforms expose well-defined extension points, events, and lifecycle hooks (Forge modules, Shopify Functions, Auth0 Actions, Kong plugin phases, WordPress hooks) that plug...

Install, Update, and Entitlement Flows

Marketplaces standardize installation, OAuth grant, license check, and entitlement validation flows for individual users, organizations, and tenants, including paid plugin billi...

Sandboxing and Permissions

Plugin runtimes enforce permission scopes, sandboxed execution (Atlassian Forge, Chrome MV3 service workers, Slack Bolt scopes, Salesforce managed packages) and review processes...

AI Tooling and Agent Plugins

AI platforms expose plugin and tool surfaces (ChatGPT GPTs and plugins, Open WebUI Functions, Claude Code plugins, OpenAI tools) that let third-party developers extend LLM behav...

API Gateway Plugin Frameworks

API gateways such as Kong, Tyk, and Gravitee define plugin frameworks where authentication, transformation, rate limiting, and observability behavior is implemented and distribu...

Scroll for all 7

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Plugin Context

9 classes · 21 properties

JSON-LD

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

PluginManifest

13 properties

JSON SCHEMA

MarketplaceListing

18 properties

JSON SCHEMA

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

Plugin Manifest Structure

13 properties

JSON STRUCTURE

Plugin Marketplace Listing Structure

18 properties

JSON STRUCTURE

Examples 2

Example request and response payloads for these APIs.

Plugin Manifest Example

13 fields

EXAMPLE

Plugin Marketplace Listing Example

18 fields

EXAMPLE

Use Cases 7

What developers build with this provider.

Editor and IDE Extensibility

Developers ship language support, linters, debuggers, and AI assistants as plugins through VS Code Marketplace and JetBrains Marketplace, reaching millions of editor installatio...

SaaS Platform App Marketplaces

ISVs build and list apps on Salesforce AppExchange, Shopify App Store, Atlassian Marketplace, HubSpot Marketplace, and Slack App Directory to extend SaaS platforms and reach ent...

Browser Extension Distribution

Developers package and distribute browser extensions for content blocking, productivity, password management, and accessibility through Chrome Web Store, Firefox Add-ons, and Mi...

API Gateway Customization

Platform teams extend Kong, Tyk, and Gravitee with custom plugins for authentication, request transformation, AI prompt firewalls, and policy enforcement, often shared through p...

CMS and Commerce Extensibility

WordPress plugin directory and Shopify App Store let merchants and publishers extend CMS and commerce platforms with payment processors, shipping integrations, page builders, an...

AI Agent Tooling

Builders publish ChatGPT GPTs and plugins, Open WebUI Functions, and Claude Code plugins to give AI agents domain-specific tools, retrieval sources, and connectors to external s...

Identity and Access Extensions

Auth0 Actions, Extensions, and the Auth0 Marketplace let teams add custom rules, MFA providers, and SSO integrations to identity flows without forking the platform.

Scroll for all 7

Integrations 14

Pre-built integrations with other platforms and tools.

VS Code Marketplace

Microsoft's marketplace for Visual Studio Code and Visual Studio extensions, with a Gallery API for search, download, and metadata.

JetBrains Marketplace

Official plugin and theme distribution platform for IntelliJ IDEA, PyCharm, WebStorm, and other JetBrains IDEs with a public plugins API.

Chrome Web Store

Google's distribution channel for Chrome and Edge browser extensions and themes, governed by Manifest V3 and the Chrome Web Store API.

Atlassian Marketplace

Marketplace for apps that extend Jira, Confluence, and Bitbucket, including Atlassian Connect and Forge apps with a public Marketplace REST API.

Salesforce AppExchange

Enterprise marketplace for managed packages and Lightning components extending Salesforce CRM, with package install APIs and security review.

Shopify App Store

Marketplace for apps extending Shopify Admin, Storefront, and Checkout via Shopify Apps, Functions, and Theme App Extensions.

WordPress Plugin Directory

Open directory of free WordPress plugins powering a large share of the web, distributed through wordpress.org with a public plugins.org API.

Slack App Directory

Directory of Slack apps and integrations built on the Slack platform, manifested through app config and the Apps API.

Microsoft AppSource

Microsoft's marketplace for business apps and Office 365 add-ins, Teams apps, and Power Platform connectors.

Google Workspace Marketplace

Distribution platform for Google Workspace add-ons and Apps Script-based extensions to Gmail, Drive, Docs, Sheets, and Calendar.

HubSpot Marketplace

Marketplace for HubSpot apps, themes, and templates extending the HubSpot CRM and CMS via OAuth apps and serverless functions.

Zapier App Directory

Directory of integrations and triggers/actions that Zapier exposes to its automation builder via the Zapier Platform CLI and Public APIs.

Kong Plugin Hub

Catalog of first-party and community plugins for Kong Gateway and Konnect, written in Lua, Go, or JavaScript and distributed through the Plugin Hub.

Open WebUI Functions

Pluggable functions, tools, and pipelines that extend the Open WebUI LLM chat interface with custom integrations and behavior.

Scroll for all 14

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Source (apis.yml)

aid: plugin
name: Plugin
description: An index and topic collection covering plugin, extension, and add-on architectures with public APIs and marketplaces.
  This collection spans editor and IDE plugin ecosystems (VS Code Marketplace, JetBrains Marketplace, Chrome Web Store, Firefox
  Add-ons), SaaS platform extension marketplaces (Atlassian Marketplace and Forge, Salesforce AppExchange, Shopify App Store,
  WordPress Plugins, Slack Apps, Discord Apps, Microsoft AppSource, Google Workspace Marketplace, Notion, Postman, Figma,
  Sketch, Webflow Apps, HubSpot Marketplace, Zapier App Directory), API gateway plugin frameworks (Kong Plugin Hub, Tyk Plugins,
  Gravitee Plugins), identity extensibility (Auth0 Actions and Extensions), and AI plugin and tool ecosystems (Open WebUI
  Functions, ChatGPT Plugins and GPTs, Claude Code plugins, OpenAI tools). It tracks the manifests, listing schemas, install
  and entitlement flows, extension points, and review and distribution APIs that power modern plugin and extension marketplaces.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Plugins
- Extension
- Marketplace
- App Directory
- Addon
tags_raw:
- Plugin
- Extension
- Marketplace
- App Directory
- Add-on
url: https://raw.githubusercontent.com/api-evangelist/plugin/refs/heads/main/apis.yml
created: '2026-05-19'
modified: '2026-05-19'
specificationVersion: '0.19'
apis: []
network:
- name: VS Code Marketplace
  url: https://raw.githubusercontent.com/api-evangelist/vs-code-marketplace/refs/heads/main/apis.yml
- name: JetBrains Marketplace
  url: https://raw.githubusercontent.com/api-evangelist/jetbrains-plugin/refs/heads/main/apis.yml
- name: Google Chrome
  url: https://raw.githubusercontent.com/api-evangelist/google-chrome/refs/heads/main/apis.yml
- name: Atlassian
  url: https://raw.githubusercontent.com/api-evangelist/atlassian/refs/heads/main/apis.yml
- name: Salesforce
  url: https://raw.githubusercontent.com/api-evangelist/salesforce/refs/heads/main/apis.yml
- name: Shopify
  url: https://raw.githubusercontent.com/api-evangelist/shopify/refs/heads/main/apis.yml
- name: WordPress
  url: https://raw.githubusercontent.com/api-evangelist/wordpress/refs/heads/main/apis.yml
- name: Slack
  url: https://raw.githubusercontent.com/api-evangelist/slack/refs/heads/main/apis.yml
- name: Discord
  url: https://raw.githubusercontent.com/api-evangelist/discord/refs/heads/main/apis.yml
- name: Microsoft Office 365
  url: https://raw.githubusercontent.com/api-evangelist/microsoft-office-365/refs/heads/main/apis.yml
- name: Google Workspace
  url: https://raw.githubusercontent.com/api-evangelist/google-workspace/refs/heads/main/apis.yml
- name: Notion
  url: https://raw.githubusercontent.com/api-evangelist/notion/refs/heads/main/apis.yml
- name: Postman
  url: https://raw.githubusercontent.com/api-evangelist/postman/refs/heads/main/apis.yml
- name: Figma
  url: https://raw.githubusercontent.com/api-evangelist/figma/refs/heads/main/apis.yml
- name: Webflow
  url: https://raw.githubusercontent.com/api-evangelist/webflow/refs/heads/main/apis.yml
- name: HubSpot
  url: https://raw.githubusercontent.com/api-evangelist/hubspot/refs/heads/main/apis.yml
- name: Zapier
  url: https://raw.githubusercontent.com/api-evangelist/zapier/refs/heads/main/apis.yml
- name: Auth0
  url: https://raw.githubusercontent.com/api-evangelist/auth0/refs/heads/main/apis.yml
- name: Kong
  url: https://raw.githubusercontent.com/api-evangelist/kong/refs/heads/main/apis.yml
- name: Tyk
  url: https://raw.githubusercontent.com/api-evangelist/tyk/refs/heads/main/apis.yml
- name: Gravitee
  url: https://raw.githubusercontent.com/api-evangelist/gravitee/refs/heads/main/apis.yml
- name: Open WebUI
  url: https://raw.githubusercontent.com/api-evangelist/open-webui/refs/heads/main/apis.yml
- name: ChatGPT
  url: https://raw.githubusercontent.com/api-evangelist/chatgpt/refs/heads/main/apis.yml
- name: OpenAI
  url: https://raw.githubusercontent.com/api-evangelist/openai/refs/heads/main/apis.yml
- name: Claude
  url: https://raw.githubusercontent.com/api-evangelist/claude/refs/heads/main/apis.yml
common:
- type: Portal
  url: https://apievangelist.com
- type: GitHubOrganization
  url: https://github.com/api-evangelist
- type: Features
  data:
  - name: Plugin Manifests
    description: Marketplaces and runtimes use declarative manifests (manifest.json for Chrome and VS Code, plugin.xml for
      JetBrains, app manifests for Slack and Atlassian Connect) to describe identity, permissions, entry points, and capabilities
      of a plugin.
  - name: Marketplace Listing and Discovery APIs
    description: Public APIs and search endpoints expose listings, categories, ratings, and download counts so developers
      and users can discover plugins across VS Code Marketplace, Chrome Web Store, JetBrains Marketplace, Shopify App Store,
      and Atlassian Marketplace.
  - name: Extension Points and Hooks
    description: Host platforms expose well-defined extension points, events, and lifecycle hooks (Forge modules, Shopify
      Functions, Auth0 Actions, Kong plugin phases, WordPress hooks) that plugins implement to integrate with the host.
  - name: Install, Update, and Entitlement Flows
    description: Marketplaces standardize installation, OAuth grant, license check, and entitlement validation flows for individual
      users, organizations, and tenants, including paid plugin billing and trials.
  - name: Sandboxing and Permissions
    description: Plugin runtimes enforce permission scopes, sandboxed execution (Atlassian Forge, Chrome MV3 service workers,
      Slack Bolt scopes, Salesforce managed packages) and review processes to protect host platforms and end users.
  - name: AI Tooling and Agent Plugins
    description: AI platforms expose plugin and tool surfaces (ChatGPT GPTs and plugins, Open WebUI Functions, Claude Code
      plugins, OpenAI tools) that let third-party developers extend LLM behavior with custom actions, retrieval, and integrations.
  - name: API Gateway Plugin Frameworks
    description: API gateways such as Kong, Tyk, and Gravitee define plugin frameworks where authentication, transformation,
      rate limiting, and observability behavior is implemented and distributed as installable plugins.
- type: UseCases
  data:
  - name: Editor and IDE Extensibility
    description: Developers ship language support, linters, debuggers, and AI assistants as plugins through VS Code Marketplace
      and JetBrains Marketplace, reaching millions of editor installations through manifest-driven distribution.
  - name: SaaS Platform App Marketplaces
    description: ISVs build and list apps on Salesforce AppExchange, Shopify App Store, Atlassian Marketplace, HubSpot Marketplace,
      and Slack App Directory to extend SaaS platforms and reach enterprise customers.
  - name: Browser Extension Distribution
    description: Developers package and distribute browser extensions for content blocking, productivity, password management,
      and accessibility through Chrome Web Store, Firefox Add-ons, and Microsoft Edge Add-ons.
  - name: API Gateway Customization
    description: Platform teams extend Kong, Tyk, and Gravitee with custom plugins for authentication, request transformation,
      AI prompt firewalls, and policy enforcement, often shared through plugin hubs.
  - name: CMS and Commerce Extensibility
    description: WordPress plugin directory and Shopify App Store let merchants and publishers extend CMS and commerce platforms
      with payment processors, shipping integrations, page builders, and analytics.
  - name: AI Agent Tooling
    description: Builders publish ChatGPT GPTs and plugins, Open WebUI Functions, and Claude Code plugins to give AI agents
      domain-specific tools, retrieval sources, and connectors to external systems.
  - name: Identity and Access Extensions
    description: Auth0 Actions, Extensions, and the Auth0 Marketplace let teams add custom rules, MFA providers, and SSO integrations
      to identity flows without forking the platform.
- type: Integrations
  data:
  - name: VS Code Marketplace
    description: Microsoft's marketplace for Visual Studio Code and Visual Studio extensions, with a Gallery API for search,
      download, and metadata.
  - name: JetBrains Marketplace
    description: Official plugin and theme distribution platform for IntelliJ IDEA, PyCharm, WebStorm, and other JetBrains
      IDEs with a public plugins API.
  - name: Chrome Web Store
    description: Google's distribution channel for Chrome and Edge browser extensions and themes, governed by Manifest V3
      and the Chrome Web Store API.
  - name: Atlassian Marketplace
    description: Marketplace for apps that extend Jira, Confluence, and Bitbucket, including Atlassian Connect and Forge apps
      with a public Marketplace REST API.
  - name: Salesforce AppExchange
    description: Enterprise marketplace for managed packages and Lightning components extending Salesforce CRM, with package
      install APIs and security review.
  - name: Shopify App Store
    description: Marketplace for apps extending Shopify Admin, Storefront, and Checkout via Shopify Apps, Functions, and Theme
      App Extensions.
  - name: WordPress Plugin Directory
    description: Open directory of free WordPress plugins powering a large share of the web, distributed through wordpress.org
      with a public plugins.org API.
  - name: Slack App Directory
    description: Directory of Slack apps and integrations built on the Slack platform, manifested through app config and the
      Apps API.
  - name: Microsoft AppSource
    description: Microsoft's marketplace for business apps and Office 365 add-ins, Teams apps, and Power Platform connectors.
  - name: Google Workspace Marketplace
    description: Distribution platform for Google Workspace add-ons and Apps Script-based extensions to Gmail, Drive, Docs,
      Sheets, and Calendar.
  - name: HubSpot Marketplace
    description: Marketplace for HubSpot apps, themes, and templates extending the HubSpot CRM and CMS via OAuth apps and
      serverless functions.
  - name: Zapier App Directory
    description: Directory of integrations and triggers/actions that Zapier exposes to its automation builder via the Zapier
      Platform CLI and Public APIs.
  - name: Kong Plugin Hub
    description: Catalog of first-party and community plugins for Kong Gateway and Konnect, written in Lua, Go, or JavaScript
      and distributed through the Plugin Hub.
  - name: Open WebUI Functions
    description: Pluggable functions, tools, and pipelines that extend the Open WebUI LLM chat interface with custom integrations
      and behavior.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
humanURL: https://apievangelist.com

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