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feat: added SetDefaultModel to JSON-RPC server (#3512)

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This adds `SetDefaultModel`, which takes `model` and `reasoning_effort`
as optional fields. If set, the field will overwrite what is in the
user's `config.toml`.

This reuses logic that was added to support the `/model` command in the
TUI: https://github.com/openai/codex/pull/2799.
This commit is contained in:
Michael Bolin
2025-09-11 23:44:17 -07:00
committed by GitHub
parent 9bbeb75361
commit c172e8e997
7 changed files with 136 additions and 2 deletions
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42
codex-rs/mcp-server/src/codex_message_processor.rs
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@@ -18,6 +18,9 @@ use codex_core::config::Config;
use codex_core::config::ConfigOverrides;
use codex_core::config::ConfigToml;
use codex_core::config::load_config_as_toml;
use codex_core::config_edit::CONFIG_KEY_EFFORT;
use codex_core::config_edit::CONFIG_KEY_MODEL;
use codex_core::config_edit::persist_non_null_overrides;
use codex_core::default_client::get_codex_user_agent;
use codex_core::exec::ExecParams;
use codex_core::exec_env::create_env;
@@ -71,6 +74,8 @@ use codex_protocol::mcp_protocol::SendUserMessageResponse;
use codex_protocol::mcp_protocol::SendUserTurnParams;
use codex_protocol::mcp_protocol::SendUserTurnResponse;
use codex_protocol::mcp_protocol::ServerNotification;
use codex_protocol::mcp_protocol::SetDefaultModelParams;
use codex_protocol::mcp_protocol::SetDefaultModelResponse;
use codex_protocol::mcp_protocol::UserInfoResponse;
use codex_protocol::mcp_protocol::UserSavedConfig;
use codex_protocol::models::ContentItem;
@@ -192,6 +197,9 @@ impl CodexMessageProcessor {
ClientRequest::GetUserSavedConfig { request_id } => {
self.get_user_saved_config(request_id).await;
}
ClientRequest::SetDefaultModel { request_id, params } => {
self.set_default_model(request_id, params).await;
}
ClientRequest::GetUserAgent { request_id } => {
self.get_user_agent(request_id).await;
}
@@ -499,6 +507,40 @@ impl CodexMessageProcessor {
self.outgoing.send_response(request_id, response).await;
}
async fn set_default_model(&self, request_id: RequestId, params: SetDefaultModelParams) {
let SetDefaultModelParams {
model,
reasoning_effort,
} = params;
let effort_str = reasoning_effort.map(|effort| effort.to_string());
let overrides: [(&[&str], Option<&str>); 2] = [
(&[CONFIG_KEY_MODEL], model.as_deref()),
(&[CONFIG_KEY_EFFORT], effort_str.as_deref()),
];
match persist_non_null_overrides(
&self.config.codex_home,
self.config.active_profile.as_deref(),
&overrides,
)
.await
{
Ok(()) => {
let response = SetDefaultModelResponse {};
self.outgoing.send_response(request_id, response).await;
}
Err(err) => {
let error = JSONRPCErrorError {
code: INTERNAL_ERROR_CODE,
message: format!("failed to persist overrides: {err}"),
data: None,
};
self.outgoing.send_error(request_id, error).await;
}
}
}
async fn exec_one_off_command(&self, request_id: RequestId, params: ExecOneOffCommandParams) {
tracing::debug!("ExecOneOffCommand params: {params:?}");