openai/codex · error · anyhow::Error

env_vars entry `{}` uses source `remote`, which requires rem

Error message

env_vars entry `{}` uses source `remote`, which requires remote MCP stdio

What it means

Error "env_vars entry `{}` uses source `remote`, which requires remote MCP stdio" thrown in openai/codex.

Source

Thrown at codex-rs/rmcp-client/src/utils.rs:92

    env.retain(|name, _| {
        name.to_str()
            .is_none_or(|name| !is_non_inheritable_env_var(name))
    });
    env
}

pub(crate) fn remote_mcp_env_var_names(env_vars: &[McpServerEnvVar]) -> Vec<String> {
    env_vars
        .iter()
        .filter(|var| var.is_remote_source())
        .filter(|var| !is_non_inheritable_env_var(var.name()))
        .map(|var| var.name().to_string())
        .collect()
}

fn local_stdio_env_var_names(env_vars: &[McpServerEnvVar]) -> Result<impl Iterator<Item = &str>> {
    if let Some(remote_var) = env_vars.iter().find(|var| var.is_remote_source()) {
        return Err(anyhow!(
            "env_vars entry `{}` uses source `remote`, which requires remote MCP stdio",
            remote_var.name()
        ));
    }
    Ok(env_vars
        .iter()
        .map(McpServerEnvVar::name)
        .filter(|name| !is_non_inheritable_env_var(name)))
}

pub(crate) fn build_default_headers(
    http_headers: Option<HashMap<String, String>>,
    env_http_headers: Option<HashMap<String, String>>,
) -> Result<HeaderMap> {
    let mut headers = HeaderMap::new();
    headers.insert(USER_AGENT, HeaderValue::from_static(MCP_USER_AGENT));

    if let Some(static_headers) = http_headers {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rmcp-client/src/utils.rs:92 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/b861c4efc5c20044. Report an issue: GitHub.