We’ve built a remote MCP server (Streamable HTTP) with both read and write tools and are trying to integrate it into a ChatGPT Business workspace. The server is fully functional — it works correctly as an MCP client in Claude, Copilot, and passes all tool calls when tested via MCP Inspector and dire…

[image] Tade95: 1. Is workspace-level write action support for custom MCP apps intentionally restricted to Enterprise in the current beta, despite the documentation stating otherwise for Business? No, write actions are available to everyone. [image] Tade95: 2. Is there a workaround to en…

Thanks for the responses so far. I wanted to share additional findings that narrow this down considerably. We have two versions of the same MCP server, with identical tool definitions: Production server: https://mcp.your-domain.com/internal/mcp → write actions are BLOCKED QA/testing server: https…

I am sure you checked but who knows. What about the tls certificate? Is it valid?

I’m having the same issue with a custom MCP server on a personal Plus plan. I’m running an instance of the iris-networks/terminal_mcp MCP server (not allowed to paste the GitHub link) and connecting it to a custom OpenAI app over a secure tunnel. When I use it in ChatGPT, OpenAI will frequently blo…

Thanks for the guidance on this. Sharing what worked for us in case it helps others hitting the same block. Following the support team’s recommendations when we open a ticket thought support@openai.com , we made these changes: We rewrote the descriptions of our write tools (and the overall descrip…

Hello! We are seeing the “This tool call was blocked by OpenAI’s safety checks.” a lot more recently, even on read_only tools. What we have found: This is coming either from the tool metadata or the tool call payload. We do give instructions in the tool description (with some emphasis on certain…

I get the same issue, which started 2 days go. I’ve tried extensive testing in the past 2 days, tried with the browser and the desktop. It is not an issue with platform - I’ve tried with a .Net api and a node.js api. Tools that do not require parameters execute successfully. But Tools that accept on…

Write actions blocked on custom MCP server – Business plan workspace, Developer Mode unavailable at workspace level

ChatGPT Apps SDK

casey-chow July 10, 2026, 1:00pm 10

Let’s centralize discussion of the safety checks over here: ChatGPT App MCP tool calls blocked by OpenAI safety checks before reaching MCP server - #16 by casey-chow

I suspect this is something new.

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Write actions blocked on custom MCP server – Business plan workspace, Developer Mode unavailable at workspace level

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