fix: use EU subdomain for MCP OAuth routing #240
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Use mcp-eu.posthog.com subdomain for EU users instead of ?region=eu query param. This is a workaround for Claude Code's OAuth bug where it ignores the authorization_servers field and fetches the OAuth metadata directly from the MCP server hostname. See: anthropics/claude-code#2267 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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The agent runner was hardcoding the US MCP URL, ignoring the user's region selection. Now uses mcp-eu.posthog.com for EU users. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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joshsny
approved these changes
Jan 21, 2026
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Problem
EU users connecting to the PostHog MCP server via Claude Code are incorrectly redirected to the US OAuth login page. This is because Claude Code has a bug where it ignores the
authorization_serversfield from OAuth protected resource metadata and instead fetches/.well-known/oauth-authorization-serverdirectly from the MCP server hostname.See: anthropics/claude-code#2267
Changes
Use
mcp-eu.posthog.comsubdomain for EU users instead of?region=euquery param.https://mcp.posthog.com/mcphttps://mcp-eu.posthog.com/mcpHow did you test this code?
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🤖 Generated with Claude Code