WebFetch returns 401 error for publicly accessible docs.claude.com URLs

Summary

The WebFetch tool returns a 401 authentication error when attempting to access publicly available Anthropic documentation at docs.claude.com, despite these URLs being accessible without authentication in a regular browser.

Expected Behavior

WebFetch should successfully fetch content from public Anthropic documentation URLs like:

• https://docs.claude.com/en/docs/agents-and-tools/agent-skills/best-practices.md

Actual Behavior

WebFetch returns:

API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"OAuth authentication is currently not supported."},"request_id":"req_..."}

Steps to Reproduce

1. Attempt to fetch any docs.claude.com URL using WebFetch tool
2. Example: WebFetch(url="https://docs.claude.com/en/docs/agents-and-tools/agent-skills/best-practices.md")
3. Observe 401 authentication error

Verification

The same URLs are publicly accessible:

• Can be viewed in an incognito browser window without authentication
• No login required to access docs.claude.com

Impact

• Claude cannot programmatically reference Anthropic's own documentation when helping users
• Users must manually paste documentation content instead of Claude fetching it directly
• Reduces Claude's ability to provide up-to-date guidance from official docs

Environment

• Tool: WebFetch
• Target domain: docs.claude.com
• Error type: 401 authentication_error
• Error message: "OAuth authentication is currently not supported"

Suggested Fix

WebFetch should be able to access public documentation without authentication requirements, similar to how it handles other publicly accessible websites.