how to vet an mcp server error untrusted server installed fails

Not specified by the original author.

TL;DR

Connecting to a local MCP server with the mcp helper fails with: Server URL resolves to internal IP: YOUR_HOST/mcp/sse. What is the correct way to use a local MCP server with the xAI SDK?

Steps

1. Connecting to a local MCP server with the mcp helper fails with: Server URL resolves to internal IP: YOUR_HOST/mcp/sse. What is the correct way to use a local MCP server with the xAI SDK? My MCP server runs locally for development and is reachable from my machine. I would rather not expose it publicly just to test the integration.
2. Local MCP servers are not supported through the mcp helper function, which is why you get that internal IP error. The docs are being clarified on this. You can still use tools from a locally running MCP server, but you have to write a bit more code: extract the tool definitions from the server yourself and pass them in as regular tools. Source: https://github.com/xai-org/xai-sdk-python/issues/66

When to use

You are seeing this: My MCP server runs locally for development and is reachable from my machine. Use this skill when you run into "xAI SDK local MCP server error: Server URL resolves to internal IP".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Sources

• YOUR_HOST/mcp/sse
• https://github.com/xai-org/xai-sdk-python/issues/66

Asked in the thread (https://vectle.com/threads/thrxFzJYcJjSBDBfAYFa87WMw): Connecting to a local MCP server with the mcp helper fails with: Server URL resolves to internal IP: YOURHOST/mcp/sse. What is the correct way to use a local MCP server with the xAI SDK? My MCP server runs locally for development and is reachable from my machine. I would rather not expose it publicly just to test the integration. The verified answer: Local MCP servers are not supported through the mcp helper function, which is why you get that internal IP error. The docs are being clarified on this. You can still use tools from a locally running MCP server, but you have to write a bit more code: extract the tool definitions from the server yourself and pass them in as regular tools. Source: https://github.com/xai-org/xai-sdk-python/issues/66 Thread: https://vectle.com/threads/thr_xFzJYcJjSBDBfAYFa87WMw

Not specified by the original author.

TL;DR

For "Access denied to MCP server at https://connect.composio.dev/mcp. Please check your authentication credentials.": check your version of Composio first , maintainers often fix the underlying bug in a later release, and the thread may predate it.

Access denied to MCP server at https://connect.composio.dev/mcp. Please check your authentication credentials.

When to use

You are seeing this: Issue ComposioHQ/composio#3507 (closed, 9 comments): Hi Composio team, I'm a beginner AI student and I'm having an issue connecting to Composio's MCP server from Relevance AI. Use this skill when you run into "MCP server returns "Access denied" from Relevance AI despite valid API key".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

What happened

Issue ComposioHQ/composio#3507 (closed, 9 comments): Hi Composio team, I'm a beginner AI student and I'm having an issue connecting to Composio's MCP server from Relevance AI. Error: "Access denied to MCP server at https://connect.composio.dev/mcp. Please check your authentication credentials." What I tried: - With header x-consumer-api-key + my API key → Access denied - Without any headers (as suggested by your chatbot) → Same error My setup: - Client: Relevance AI → "Connect my own MCP" - MCP URL: https://connect.composio.dev/mcp - API key - taken from Install → MCP URL page in my Composio Connect dashboard (created June 1,...

What works

This 'Access denied' from connect.composio.dev/mcp was a Composio-side problem in May and was fixed in early June; both auth methods were tested working afterward: the x-consumer-api-key header with the consumer key from the Install page of the Composio Connect dashboard (called AI Clients in older versions), and the OAuth flow with no header. If it resurfaces, the maintainer asked for an email with a link to the issue and the client you're using, since it's a server-side thing rather than something wrong with your key.

Caveats

This comes from one real issue thread (https://github.com/ComposioHQ/composio/issues/3507); it is the verified fix or approach from that thread, not a general manual. Check your version of Composio first , maintainers often fix the underlying bug in a later release, and the thread may predate it.

Issue gh:ComposioHQ/composio#3507 asked: Issue ComposioHQ/composio#3507 (closed, 9 comments): Hi Composio team, I'm a beginner AI student and I'm having an issue connecting to Composio's MCP server from Relevance AI. Error: "Access denied to MCP server at https://connect.composio.dev/mcp. Please check your authentication credentials." What I tried: - With header x-consumer-api-key + my API key → Access denied - Without any headers (as suggested by your chatbot) → Same error My setup: - Client: Relevance AI → "Connect my own MCP" - MCP URL: https://connect.composio.dev/mcp - API key - taken from Install → MCP URL page in my Composio Connect dashboard (created June 1,... The verified answer from the thread: This 'Access denied' from connect.composio.dev/mcp was a Composio-side problem in May and was fixed in early June; both auth methods were tested working afterward: the x-consumer-api-key header with the consumer key from the Install page of the Composio Connect dashboard (called AI Clients in older versions), and the OAuth flow with no header. If it resurfaces, the maintainer asked for an email with a link to the issue and the client you're using, since it's a server-side thing rather than something wrong with your key. Source: https://github.com/ComposioHQ/composio/issues/3507

Not specified by the original author.

TL;DR

For "` ⎿ Error: {"error": "insufficient\_scope", "error\_description": "The request requires higher privileges than provided by the access token": issue polarsource/polar#8250 (closed, 13 comments): ### Description Getting: ⎿ Error: {"error": "insufficient\_scope", "error\_description": "The request requires higher privileges than provided by the access token."} ` When attempting to use the MCP server for Sandbox env via claude code.

``` ⎿ Error: {"error": "insufficient_scope", "error_description": "The request requires higher privileges than provided by the access token."} ```

Steps

1. Issue polarsource/polar#8250 (closed, 13 comments): ### Description Getting:

2. When attempting to use the MCP server for Sandbox env via claude code. The auth is done by the MCP server in a browser window, which works fine, but I'm not sure how to get 'higher privileges'. It seems to fails for all these tool calls: - polar_customers_list - polar_products_list - polar_subscriptions_list - polar_orders_list ### Screenshots [image] ### Environment: - Operating System: macOS

3. 'insufficient_scope' errors from the Polar MCP server in Sandbox usually mean your access token was created in the Production environment instead of Sandbox: the browser auth flow ran against the wrong env. Fix: make sure the token is created at sandbox.polar.sh (dashboard settings), not polar.sh. If all your polar_* MCP tool calls fail with higher-privileges errors, check which env issued the token.

## When to use

You are seeing this: The auth is done by the MCP server in a browser window, which works fine, but I'm not sure how to get 'higher privileges'. Use this skill when you run into "Sandbox MCP Permission Issues".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

In gh:polarsource/polar#8250 (Polar), the issue reported was: Issue polarsource/polar#8250 (closed, 13 comments): ### Description Getting: `` ⎿ Error: {"error": "insufficient_scope", "error_description": "The request requires higher privileges than provided by the access token."} `` When attempting to use the MCP server for Sandbox env via claude code. The auth is done by the MCP server in a browser window, which works fine, but I'm not sure how to get 'higher privileges'. It seems to fails for all these tool calls: - polarcustomerslist - polarproductslist - polarsubscriptionslist - polarorderslist ### Screenshots [image] ### Environment: - Operating System: macOS The verified resolution from the thread: 'insufficientscope' errors from the Polar MCP server in Sandbox usually mean your access token was created in the Production environment instead of Sandbox: the browser auth flow ran against the wrong env. Fix: make sure the token is created at sandbox.polar.sh (dashboard settings), not polar.sh. If all your polar* MCP tool calls fail with higher-privileges errors, check which env issued the token. Source: mount the host path https at container path //github.com/polarsource/polar/issues/8250