---
title: "Plugin vendor extensions"
canonical: "https://canmyagentuse.com/features/plugin-vendor-extensions"
contentKind: "feature"
locale: "en"
description: "Preserve namespaced host-specific behavior without representing it as portable core support. This is tracked as an independent compatibility claim."
llmSummary: "Plugin vendor extensions is atomic and does not follow automatically from broader plugins support."
publishedAt: "2026-08-28T00:00:00.000Z"
updatedAt: "2026-08-28T00:00:00.000Z"
verifiedAt: "2026-08-28"
tags: ["interfaces","plugins"]
---

# Plugin vendor extensions

Plugin vendor extensions is atomic and does not follow automatically from broader plugins support.

- HTML: https://canmyagentuse.com/features/plugin-vendor-extensions
- JSON: https://canmyagentuse.com/api/v1/features/plugin-vendor-extensions.json
- Markdown: https://canmyagentuse.com/features/plugin-vendor-extensions.md

Terminology basis: **Agent Plugins 1.0** — https://agent-plugins.org/specification/1.0.

## Current support at a glance

Plugin vendor extensions: 0 supported, 1 partial, 0 unsupported, 30 unreviewed across 31 cataloged products.

- Reviewed current products: 1 of 31
- Supported: 0
- Partial: 1
- Unsupported: 0
- Unreviewed: 30
- Not applicable: 0

Unknown or unreviewed means insufficient published evidence; it does not mean unsupported.

Preserve namespaced host-specific behavior without representing it as portable core support.

Support is recorded only when exact, dated evidence covers this behavior.

## Catalog context

- Category: [interfaces](/categories/interfaces.md)
- Specification: [agent-plugins](/specs/agent-plugins.md) — revision 1.0.0
- Aliases: namespaced plugin extensions
- Family: [Plugin systems](/features/plugins.md)
- Siblings: [Agent Plugins failure isolation](/features/agent-plugin-failure-isolation.md), [Agent Plugins packaged MCP](/features/agent-plugin-mcp.md), [Agent Plugins packaged skills](/features/agent-plugin-skills.md), [Agent Plugins portable manifest](/features/agent-plugin-core.md), [Native plugin system](/features/native-plugins.md), [Plugin marketplace](/features/plugin-marketplace.md)

## Compatibility assertions

Unknown means insufficient published evidence; it does not mean unsupported.

### ChatGPT (web)

- Harness: [ChatGPT](/harnesses/chatgpt-web.md)
- current: **Unknown**
- preview: **Unknown**

### Claude (web)

- Harness: [Claude](/harnesses/claude-web.md)
- current: **Unknown**
- preview: **Unknown**

### Gemini (web)

- Harness: [Gemini](/harnesses/gemini-web.md)
- current: **Unknown**
- preview: **Unknown**

### Copilot (web)

- Harness: [Copilot](/harnesses/copilot-web.md)
- current: **Unknown**
- preview: **Unknown**

### Grok (web)

- Harness: [Grok](/harnesses/grok-web.md)
- current: **Unknown**
- preview: **Unknown**

### Grok Bot (desktop)

- Harness: [Grok Bot](/harnesses/grok-bot-desktop.md)
- current: **Unknown**

### Perplexity (web)

- Harness: [Perplexity](/harnesses/perplexity-web.md)
- current: **Unknown**
- preview: **Unknown**

### Le Chat (web)

- Harness: [Le Chat](/harnesses/le-chat.md)
- current: **Unknown**
- preview: **Unknown**

### Devin (web)

- Harness: [Devin](/harnesses/devin-web.md)
- current: **Unknown**
- preview: **Unknown**

### Replit Agent (web)

- Harness: [Replit Agent](/harnesses/replit-agent.md)
- current: **Unknown**
- preview: **Unknown**

### ChatGPT (desktop)

- Harness: [ChatGPT](/harnesses/chatgpt-desktop.md)
- current: **Unknown**
- preview: **Unknown**

### Claude (desktop)

- Harness: [Claude](/harnesses/claude-desktop.md)
- current: **Unknown**
- preview: **Unknown**

### Cursor (desktop)

- Harness: [Cursor](/harnesses/cursor.md)
- current: **Unknown**
- preview: **Unknown**

### OpenWork Desktop (desktop)

- Harness: [OpenWork Desktop](/harnesses/openwork-desktop.md)
- current: **Unknown**

### Copilot Chat (desktop)

- Harness: [Copilot Chat](/harnesses/vscode-copilot.md)
- current: **Unknown**
- preview: **Unknown**

### Chrome WebMCP origin trial (desktop)

- Harness: [Chrome WebMCP origin trial](/harnesses/chrome-webmcp-preview.md)
- current: **Unknown**

### Windsurf (desktop)

- Harness: [Windsurf](/harnesses/windsurf.md)
- current: **Unknown**
- preview: **Unknown**

### Zed Agent (desktop)

- Harness: [Zed Agent](/harnesses/zed-agent.md)
- current: **Unknown**
- preview: **Unknown**

### Continue (desktop)

- Harness: [Continue](/harnesses/continue.md)
- current: **Unknown**
- preview: **Unknown**

### Cline (desktop)

- Harness: [Cline](/harnesses/cline.md)
- current: **Unknown**
- preview: **Unknown**

### JetBrains AI (desktop)

- Harness: [JetBrains AI](/harnesses/jetbrains-ai.md)
- current: **Unknown**
- preview: **Unknown**

### Warp (desktop)

- Harness: [Warp](/harnesses/warp.md)
- current: **Unknown**
- preview: **Unknown**

### Claude CLI (cli)

- Harness: [Claude CLI](/harnesses/claude-cli.md)
- current: **Partial**
  - Target: dated-documentation — current Claude Code plugins reference; observed 2026-08-28
  - Environment: local-default
  - Constraint (vendor-extension): Claude Code supports its own metadata and experimental manifest fields and treats foreign top-level fields as non-fatal, but does not document the Agent Plugins reverse-domain extensions object or namespace-directory model
  - Evidence: [Anthropic — Claude Code plugins reference](https://code.claude.com/docs/en/plugins-reference) — documented; observed 2026-08-28
  - Qualification note 1: Claude Code keeps foreign manifest fields non-fatal and has native metadata and experimental fields, but does not document the Agent Plugins reverse-domain extensions model.
- preview: **Unknown**

### ChatGPT CLI (cli)

- Harness: [ChatGPT CLI](/harnesses/chatgpt-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Codex CLI (cli)

- Harness: [Codex CLI](/harnesses/codex-cli.md)
- current: **Unknown**
- preview: **Unknown**

### OpenCode (cli)

- Harness: [OpenCode](/harnesses/opencode.md)
- current: **Unknown**
- preview: **Unknown**

### Gemini CLI (cli)

- Harness: [Gemini CLI](/harnesses/gemini-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Aider (cli)

- Harness: [Aider](/harnesses/aider.md)
- current: **Unknown**
- preview: **Unknown**

### Goose (cli)

- Harness: [Goose](/harnesses/goose.md)
- current: **Unknown**
- preview: **Unknown**

### Copilot CLI (cli)

- Harness: [Copilot CLI](/harnesses/copilot-cli.md)
- current: **Unknown**
- preview: **Unknown**

### Amp (cli)

- Harness: [Amp](/harnesses/amp-cli.md)
- current: **Unknown**
- preview: **Unknown**