docs(mcp): add EU subdomain instructions for Claude Code #14502
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Claude Code requires the mcp-eu.posthog.com subdomain for EU users due to an OAuth bug where it ignores the authorization_servers field. Other clients can continue using the ?region=eu query parameter. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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joshsny
approved these changes
Jan 22, 2026
| If your PostHog project is on EU Cloud, add `?region=eu` to the MCP URLs. For example: `https://mcp.posthog.com/mcp?region=eu` | ||
| If your PostHog project is on EU Cloud: | ||
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| - **Claude Code**: Use `https://mcp-eu.posthog.com/mcp` (the EU subdomain is required for OAuth to work correctly) |
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this is confusing, can we just tell them to use mcp-eu, its weird to have two standards?
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| If your PostHog project is on EU Cloud: | ||
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| - **Claude Code**: Use `https://mcp-eu.posthog.com/mcp` (the EU subdomain is required for OAuth to work correctly) | ||
| - **Other clients**: Add `?region=eu` to the MCP URLs, e.g., `https://mcp.posthog.com/mcp?region=eu` |
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Why not suggest the mcp-eu subdomain at all times? Is there anything bad with it? We should have simpler docs if possible
rafaeelaudibert
approved these changes
Jan 22, 2026
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
sarahxsanders
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Jan 26, 2026
* docs(mcp): add EU subdomain instructions for Claude Code Claude Code requires the mcp-eu.posthog.com subdomain for EU users due to an OAuth bug where it ignores the authorization_servers field. Other clients can continue using the ?region=eu query parameter. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * chore: simplify EU MCP docs to use subdomain for all clients Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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Problem
EU users using Claude Code with the PostHog MCP server were being redirected to US OAuth login even with
?region=eu. This is due to a Claude Code bug where it ignores theauthorization_serversfield from OAuth metadata.Changes
Updated the EU region callout box to specify:
https://mcp-eu.posthog.com/mcpsubdomain?region=euquery parameterRelated PRs
🤖 Generated with Claude Code