424 Failed Dependency error when connecting to Stripe remote MCP connector

API Bugs
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Environment / Integration Details:

  • Feature: External Remote MCP Connector

  • Target Server: Stripe MCP Server ([https://mcp.stripe.com](https://mcp.stripe.com) / @stripe/mcp)

  • Error Code: 424 (Failed Dependency) / Error retrieving tool list from MCP server

Description:

We are experiencing a persistent HTTP 424 (Failed Dependency) error when attempting to fetch or initialize the tool list from an external Model Context Protocol (MCP) server, specifically the standard Stripe MCP connector.

The connection attempt fails on the OpenAI side during initialization/tool retrieval before executing upstream tool logic.

Key Context & Isolation Steps Taken:

  1. Verification via non-OpenAI Client: The exact same Stripe MCP setup and credentials function without issue when connecting via Gemini (and standard MCP Inspector tools). The tool list initializes cleanly and tool calls execute as expected outside of OpenAI.

  2. Error behavior: OpenAI receives a 424 Failed Dependency status during tools/list or connector registration, suggesting an unhandled exception or handshake/validation failure in the OpenAI MCP proxy runtime rather than an issue on Stripe’s endpoint.

N.B. The issue seems to happen since Monday 27/08/2026 at around 6 pm CET

2

I’m also facing this issue as of 08/27/2026