Install in ChatGPT

ChatGPT Web support is best-effort until ChatGPT shows the Hoist app and returns a Hoist tool result. Full MCP apps, including write actions, are available on ChatGPT web for Business and Enterprise/Edu. ChatGPT Pro supports custom MCP apps only for read/fetch permissions. Hoist includes write-capable tools, so Pro is not a complete Hoist host.

Hoist also exposes PPSR paid-operation shapes, but paid PPSR searches and pricing are not currently available through Hoist. See OpenAI’s current developer-mode requirements for plan, role, and web-only availability details.

Config

app values

Name:           Hoist
MCP endpoint:   https://mcp.assets.hoistai.com/mcp
Authentication: OAuth

Steps

1. On ChatGPT web, open Settings > Apps > Advanced settings and enable Developer mode.
2. Open Settings > Apps > Create app. Workspace admins and owners can instead use Workspace settings > Apps > Create app.
3. Name the app Hoist, enter the MCP endpoint https://mcp.assets.hoistai.com/mcp, and select OAuth authentication.
4. Select Scan Tools, complete OAuth when prompted, and wait for the tool scan to finish.
5. Select Create, start a new chat, and choose Hoist from the app/tool picker.
6. Treat ChatGPT output as Hoist source-backed only after ChatGPT shows the Hoist app and a Hoist tool result.

Smoke test

Ask: “Use Hoist to run abn_lookup for ABN 11695718659. Do not run a paid PPSR search.” A passing result should show the Hoist app, name the Hoist tool, and return source-cited ABN data. This is a test to perform after setup, not a claim that ChatGPT has already passed it.

Troubleshooting

• If Create app is missing, confirm the account is using ChatGPT web and check plan, role, and workspace policy. Pro cannot use Hoist’s full write-capable tool surface.
• If the OAuth window does not open, check browser pop-up settings.
• If calls return 403, re-approve OAuth.
• If tools do not appear, reopen the draft app and run Scan Tools again.