NPM package validation failing for certain packages

[domdomegg]

From Discord:

I'm trying to publish my MCP server and it is not working.

Error: publish failed: server returned status 400: {"title":"Bad Request","status":400,"detail":"Failed to publish server","errors":[{"message":"registry validation failed for package 0 (@hellocoop/admin-mcp): NPM package '@hellocoop/admin-mcp' not found (status: 404)"}]}

[domdomegg]

My initial guess is that maybe it's something about the URL encoding etc, given the @ and / symbols? Not sure we have tests for namespaced servers, which we should.

[Avish34]

@domdomegg I will also try to check this. We certainly need to add more test cases :)

[dickhardt]

@hellocoop/admin-mcp is the NPM package name

Let me know what I can do to help debug

[Avish34]

@dickhardt can you please help me with your server.json that you used to publish? I need to find what's going wrong.

[dickhardt]

{
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
  "name": "io.github.hellocoop/admin-mcp",
  "description": "Model Context Protocol (MCP) for Hellō Admin API.",
  "status": "active",
  "repository": {
    "url": "https://github.com/hellocoop/admin-mcp",
    "source": "github"
  },
  "version": "1.0.0",
  "packages": [
    {
      "registry_type": "npm",
      "registry_base_url": "https://registry.npmjs.org",
      "identifier": "@hellocoop/admin-mcp",
      "version": "1.0.0",
      "transport": {
        "type": "stdio"
      }
    }
  ]
}

[dickhardt]

repo is public

https://github.com/hellocoop/admin-mcp

[dickhardt]

I just tried to publish again and got the same error

I do:
mcp-publisher login github
Then:
mcp-publisher publish

and get

Publishing to https://registry.modelcontextprotocol.io...
Error: publish failed: server returned status 400: {"title":"Bad Request","status":400,"detail":"Failed to publish server","errors":[{"message":"registry validation failed for package 0 (@hellocoop/admin-mcp): NPM package '@hellocoop/admin-mcp' not found (status: 404)"}]}

[domdomegg]

Think this should be fixed by #429

[A1996-dot]

{
"$schema": "https://static.modelcontextprotocol.io/schemas/2025-07-09/server.schema.json",
"name": "io.github.hellocoop/admin-mcp",
"description": "Model Context Protocol (MCP) for Hellō Admin API.",
"status": "active",
"repository": {
"url": "https://github.com/hellocoop/admin-mcp",
"source": "github"
},
"version": "1.0.0",
"packages": [
{
"registry_type": "npm",
"registry_base_url": "https://registry.npmjs.org",
"identifier": "@hellocoop/admin-mcp",
"version": "1.0.0",
"transport": {
"type": "studio"
}
}
]
}
some error i find than i do correction