codex in vscode doesn't work

What version of Codex is running?

codex-cli 0.50.0

What subscription do you have?

free

Which model were you using?

qwen3-coder

What platform is your computer?

Darwin 24.6.0 arm64 arm

What issue are you seeing?

I use codex vscode extension to test with the prompt write 1 to a.txt, the codex panel shows it had finished working, but actually nothing changed in my workspace.

here is the conversation output:

<|endoftext|><|im_start|>
<|im_start|>
<|endoftext|><|im_start|>
<|im_start|>
<|endoftext|><|repo_name|>
<function=shell>
<parameter=command>
["echo", "1", ">", "a.txt"]
</parameter>
<parameter=justification>
Writing the number 1 to a file named a.txt as requested
</parameter>
<parameter=with_escalated_permissions>
True
</parameter>
</function>
</tool_call>

here is the codex logs in vscode extension output panel:

2025-10-29 11:24:11.413 [error] Unknown MCP notification: sessionConfigured {"sessionId":"019a2de4-c3a0-7662-be67-05474349ccfc","model":"qwen3-coder","reasoningEffort":"high","historyLogId":116814424,"historyEntryCount":38,"initialMessages":[{"type":"user_message","message":"# Context from my IDE setup:\n\n## Active file: /Users/xxxx/.codex/config.toml\n\n## Active selection of the file:\ners.context7]\n# command = \"npx\"\n# args = [\"-y\"\n## Open tabs:\n- article.json: data/article.json\n- prompt.txt: prompt.txt\n- fileUtils.ts: src/utils/fileUtils.ts\n- config.toml: /Users/wenhua/.codex/config.toml\n\n## My request for Codex:\nwrite `1` to a.txt\n","images":[]},{"type":"agent_message","message":"I'll write '1' to `a.txt` using the shell."},{"type":"token_count","info":null,"rate_limits":null}],"rolloutPath":"/Users/xxxx/.codex/sessions/2025/10/29/rollout-2025-10-29T10-55-58-019a2de4-c3a0-7662-be67-05474349ccfc.jsonl"}
2025-10-29 11:24:19.649 [error] Unknown MCP notification: codex/event/user_message {"id":"0","msg":{"type":"user_message","message":"# Context from my IDE setup:\n\n## Active file: codex-rs/core/src/mcp_connection_manager.rs\n\n## Open tabs:\n- codex.js: codex-cli/bin/codex.js\n- codex_message_processor.rs: codex-rs/app-server/src/codex_message_processor.rs\n- mcp_process.rs: codex-rs/app-server/tests/common/mcp_process.rs\n- list_resume.rs: codex-rs/app-server/tests/suite/list_resume.rs\n- archive_conversation.rs: codex-rs/app-server/tests/suite/archive_conversation.rs\n- codex.rs: codex-rs/core/src/codex.rs\n- mcp_connection_manager.rs: codex-rs/core/src/mcp_connection_manager.rs\n\n## My request for Codex:\nwrite `1` to a.txt\n","images":[]},"conversationId":"019a2de4-c3a0-7662-be67-05474349ccfc"}

What steps can reproduce the bug?

Uploaded thread: 019a2e03-4eaf-71e2-bdcd-8feeee317ff9

What is the expected behavior?

the prompt can create the file a.txt with content 1

Additional information

I am using litellm-proxy as my provider with model qwen3-coder

my codex config content

# Codex CLI Configuration
# See: https://developers.openai.com/codex/local-config#ide

model_reasoning_effort = "high"
model_reasoning_summary = "detailed"
show_raw_agent_reasoning = false
model_verbosity = "high"
approval_policy = "untrusted"
sandbox_mode = "workspace-write"
hide_agent_reasoning = false
model = "qwen3-coder"
model_provider = "litellm"

[model_providers.litellm]
name = "litellm"
base_url = "http://localhost:4000"

codex extension version
Version
0.4.31
Last Updated
2025-10-29, 08:44:01