codex - 💡(How to fix) Fix Failing to use apply_patch tool [4 comments, 3 participants]

What version of Codex CLI is running?

codex-cli 0.120.0

What subscription do you have?

None, using local model via LM Studio

Which model were you using?

openai/gpt-oss-20b

What platform is your computer?

Darwin 25.4.0 arm64 arm

What terminal emulator and version are you using (if applicable)?

GhosTTy

What issue are you seeing?

apply_patch tool keeps failing:

• Ran apply_patch └ Usage: apply_patch 'PATCH' echo 'PATCH' | apply_patch

• - Begin Patch\n..."]}. That's exec_command expecting "cmd" field maybe array? The earlier example is confusing. Let's check the tool spec: In functions namespace, there's apply_patch with arguments: command string? It says:

apply_patch tool signature: type apply_patch = (_: {command:"string", ...}) => any; Actually earlier spec says:

apply_patch: (_: { command: string, ... }) => any;

So we need to pass "command":"apply_patch"?? Wait the example shows:

{"command":["apply_patch","*** Begin Patch\n..."]}

So maybe the command field is an array: first element tool name? Actually they used exec_command earlier. Let's search for previous usage of apply_patch in logs: Not present.

Maybe we need to use apply_patch tool directly with argument "command" being array? Let's try:

(...)

What steps can reproduce the bug?

Uploaded thread: 019d8fa8-12c1-7691-9c45-08b9fa850073

What is the expected behavior?

No errors with apply_patch

Additional information

No response