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claude-code - 💡(How to fix) Fix [BUG] Claude Code on the web session blocks registry.tiptap.dev — private npm registries fail with host_not_allowed [1 comments, 2 participants]

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anthropics/claude-code#54897•Fetched 2026-05-01 05:51:34
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Error Message

Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

In a Claude Code on the web session (https://claude.ai/code), npm install fails when a workspace depends on packages hosted on a private npm registry (in our case registry.tiptap.dev for @tiptap-pro/*). The sandbox's policy blocks the host before the request reaches the registry.

What Should Happen?

In Claude Code web session, we should be allowed to install from private npm registry. In this case, tiptap pro requires installing from private npm registry https://tiptap.dev/docs/guides/pro-extensions

Error Messages/Logs

Steps to Reproduce

Start a Claude Code on the web session in a repo whose package.json depends on @tiptap-pro/* packages. The repo's install command configures the registry and auth token: npm config set "@tiptap-pro:registry" https://registry.tiptap.dev/ npm config set "//registry.tiptap.dev/:_authToken" "$TIPTAP_REGISTRY_TOKEN" npm ci TIPTAP_REGISTRY_TOKEN is present in the env. Run npm install (or npm run build, which depends on it).

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.123

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue can be resolved by configuring the Claude Code sandbox to allow requests to the private npm registry.

Guidance

  • Verify that the TIPTAP_REGISTRY_TOKEN environment variable is correctly set and passed to the npm config commands.
  • Check the Claude Code documentation for any specific configuration options or settings that may be required to allow requests to private npm registries.
  • Consider modifying the npm config commands to use a different authentication method, such as a .npmrc file, to see if that resolves the issue.
  • Test the npm install command with the --verbose flag to get more detailed output and potentially identify the exact point of failure.

Example

No code snippet is provided as the issue is more related to configuration and environment setup.

Notes

The issue may be specific to the Claude Code Opus model or the Anthropic API platform, and further investigation may be required to determine the root cause.

Recommendation

Apply workaround: Configure the Claude Code sandbox to allow requests to the private npm registry, as this is the most likely cause of the issue.

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#api#file not found#serialization error#model compatibility#GPU setup

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