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Overview

ChatGPT connects to remote MCP servers as custom connectors. Once added, StackOne’s actions are available as tools in your chats.
Custom MCP connectors require Developer Mode and are available on paid ChatGPT plans (Plus, Pro, Business, Enterprise, Edu). Availability and steps change often — see OpenAI’s connectors documentation for the current flow.

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Setup

StackOne’s MCP endpoint is a remote, Streamable HTTP server:
1

Get your MCP URL

In the StackOne dashboard, open a connector, click Use in Agent, select a linked account, and copy the generated token URL (https://api.stackone.com/mcp?token=...).
2

Add it as a custom connector

In ChatGPT, enable Developer Mode, then go to Settings → Connectors → Create and paste the StackOne MCP URL. ChatGPT handles the connection over Streamable HTTP — no mcp-remote wrapper needed.
3

Use it in a chat

Start a new chat, enable the StackOne connector, and try:

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Handling large tool catalogs

If the connector exposes many actions, add the tool-mode=search_execute query parameter to the MCP URL in your config. The client then registers just two tools — search + execute — and the agent discovers actions at runtime, so the context footprint stays flat however large the catalog:
For a token URL, append it as an extra parameter: https://api.stackone.com/mcp?token=<session_token>&tool-mode=search_execute. See Tool Discovery for how search works, its accuracy, and the other modes.

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Optimize and secure

With your agent connected, use StackOne’s platform features to optimize performance and secure every call.

Search & Execute

Reduce context and save tokens.

Data Sync

Reduce latency and enable semantic search.

Defender

Block prompt injections before they reach your agent.