MCP Errors: 0.12.0 was last version to load and reliably run most _reference_ MCP servers

What version of Codex is running?

0.13.0 with errors being emitted in 0.14.0+

Which model were you using?

gpt-oss

What platform is your computer?

Linux x86_64

What steps can reproduce the bug?

any versions work reliably? errors?
0.12.0 yes, [no errors]
0.13.0 no, [no errors]
0.14.0 no, Failed to convert MCP tool to OpenAI tool: Error....
0.15.0 no, Failed to convert MCP tool to OpenAI tool: Error....
0.16.0 no, Failed to convert MCP tool to OpenAI tool: Error....
0.17.0 missing release
0.18.0 missing release
0.19.0 no, Failed to convert MCP tool to OpenAI tool: Error....
0.20.0 no, Failed to convert MCP tool to OpenAI tool: Error....

What is the expected behavior?

when using the tui, successful tool calling is normally noted in the log without a reload error on all MCP servers for each prompt

What do you see instead?

errors on most of the basic set of so-called "Reference" MCP Servers, mcp/git, for example:

_Failed to convert "git__git_branch" MCP tool to OpenAI tool: Error("missing field type", line: 0, column: 0)_

Additional information

_No response_