Notion MCP server tool create-a-database not supported in codex

What version of Codex is running?

0.39.0

Which model were you using?

gpt-5-codex

What platform is your computer?

Darwin 24.6.0 arm64 arm

What steps can reproduce the bug?

Add the notion MCP server inside CODEX_HOME/config.toml:

# IMPORTANT: the top-level key is `mcp_servers` rather than `mcpServers`.
[mcp_servers.notion]
command = "npx"
args = ["-y", "@notionhq/notion-mcp-server"]
env = { "NOTION_TOKEN" = "<your-notion-token>" }

To get your token follow the steps in https://github.com/makenotion/notion-mcp-server. Then

• tail the logs of codex tail -F ~/.codex/log/codex-tui.log
• Ask codex to create an empty Notion page with a empty database

What is the expected behavior?

No error in the logs and a working create a database Notion MCP tool.

What do you see instead?

When tailing the logs of codex tail -F ~/.codex/log/codex-tui.log at every call you get the following error:

2025-09-21T22:12:53.843020Z ERROR Failed to convert "notion__API-create-a-database" MCP tool to OpenAI tool: Error("invalid type: map, expected a boolean", line: 0, column: 0)

See screenshot for example:

<img width="1600" height="1021" alt="Image" src="https://github.com/user-attachments/assets/d23f0abf-311e-4beb-9aff-0c7993f6b141" />

When trying to ask codex to create a database it then fails. All other Notion tools work (summarize, create a page etc...)

Additional information

_No response_