refactor: frame .plugin as vendor-neutral Open Plugin, not VS Code

`.plugin/plugin.json` is the Open Plugin format, which any agent host can
consume — VS Code is just its first consumer. Verified against VS Code
1.128.1: it only auto-detects three shared manifests (.plugin, .claude-plugin,
bare plugin.json) and has no VS Code-only manifest path.

- Rename agents/vscode/ -> agents/open-plugin/ and set X-Source-Name to
  `open-plugin` (was `vscode-plugin`), since the header is part of a neutral
  format rather than a VS Code-specific surface.
- Neutralize the .plugin manifest description.
- VS Code installs remain attributable server-side via the MCP `clientInfo`
  (`vscode_agent_host`) sent on initialize.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Rodriguespn

.plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "supabase",
   "version": "0.1.12",
-  "description": "Supabase tools for VS Code agent plugins — MCP server for managing your Supabase projects and skills to guide you through every stage of building with Supabase.",
+  "description": "Official Supabase plugin in the vendor-neutral Open Plugin format with bundled Supabase skills and MCP access for project management, database work, auth, storage, and Postgres best practices.",
   "author": {
     "name": "Supabase",
     "email": "support@supabase.io"
@@ -22,5 +22,5 @@
     "rls"
   ],
   "skills": "./skills/",
-  "mcpServers": "./agents/vscode/.mcp.json"
+  "mcpServers": "./agents/open-plugin/.mcp.json"
 }

AGENTS.md

@@ -10,8 +10,8 @@ Keep this repository focused on the shared multi-vendor plugin layout:
 - `.cursor-plugin/plugin.json` defines the Cursor plugin surface
 - `.codex-plugin/plugin.json` defines the Codex plugin surface
 - `.github/plugin/plugin.json` defines the GitHub Copilot plugin surface
-- `.plugin/plugin.json` defines the vendor-neutral open-plugin surface that VS Code auto-detects (see below)
-- `agents/claude/.mcp.json`, `agents/cursor/mcp.json`, `agents/codex/.app.json`, `agents/copilot/.mcp.json`, and `agents/vscode/.mcp.json` hold agent-specific MCP config files
+- `.plugin/plugin.json` defines the vendor-neutral [Open Plugin](https://open-plugins.com/) surface (consumed by VS Code today, and by any other Open Plugin host)
+- `agents/claude/.mcp.json`, `agents/cursor/mcp.json`, `agents/codex/.app.json`, `agents/copilot/.mcp.json`, and `agents/open-plugin/.mcp.json` hold agent-specific MCP config files
 - `gemini-extension.json` defines the Gemini extension manifest
 - `skills/` contains the shipped, real skill files consumed by the supported plugin surfaces
 
@@ -53,9 +53,10 @@ Known vendor documentation pages:
   - https://docs.github.com/en/copilot/reference/copilot-cli-reference/cli-plugin-reference
 - Gemini CLI:
   - https://geminicli.com/docs/extensions/writing-extensions/
-- VS Code:
+- Open Plugin format (`.plugin/plugin.json`, consumed by VS Code):
+  - https://open-plugins.com/
   - https://code.visualstudio.com/docs/agent-customization/agent-plugins
-  - Auto-detects `.plugin/plugin.json` first; uses the vendor-neutral open-plugin manifest pointing at `agents/vscode/.mcp.json`. Installable via **Chat: Install Plugin From Source**.
+  - `.plugin/plugin.json` is the vendor-neutral Open Plugin manifest, not a VS Code-specific format. VS Code (verified against `1.128.1`) only auto-detects three shared manifests — `.plugin/plugin.json`, then `.claude-plugin/plugin.json`, then a bare `plugin.json` — and has no VS Code-only manifest path. Because the format is neutral, its MCP config (`agents/open-plugin/.mcp.json`) uses `X-Source-Name: open-plugin`. VS Code installs are still distinguishable server-side: VS Code sends `clientInfo.name: "vscode_agent_host"` in the MCP `initialize` handshake. Installable via **Chat: Install Plugin From Source**.
 
 For vendors listed above, read the official documentation pages for the vendor you are working on and follow the plugin structure required by those docs.
 

README.md

@@ -23,7 +23,7 @@ Per-vendor plugin manifests and MCP adapters:
 | Codex          | ✓         |
 | GitHub Copilot | ✓         |
 | Gemini         | ✓         |
-| VS Code        | ✓         |
+| VS Code (Open Plugin) | ✓  |
 
 
 ## Notes

agents/vscode/.mcp.json agents/open-plugin/.mcp.jsonagents/vscode/.mcp.json renamed to agents/open-plugin/.mcp.json

@@ -4,7 +4,7 @@
       "type": "http",
       "url": "https://mcp.supabase.com/mcp",
       "headers": {
-        "X-Source-Name": "vscode-plugin",
+        "X-Source-Name": "open-plugin",
         "X-Source-Version": "0.1.12"
       }
     }

release-please-config.json

@@ -52,7 +52,7 @@
         },
         {
           "type": "json",
-          "path": "agents/vscode/.mcp.json",
+          "path": "agents/open-plugin/.mcp.json",
           "jsonpath": "$.mcpServers.supabase.headers[\"X-Source-Version\"]"
         },
         {