openai/codex · error · std::io::Error

project_root_markers must be an array of strings

Error message

project_root_markers must be an array of strings

What it means

Error "project_root_markers must be an array of strings" thrown in openai/codex.

Source

Thrown at codex-rs/config/src/project_root_markers.rs:24

/// Reads `project_root_markers` from a merged `config.toml` [toml::Value].
///
/// Invariants:
/// - If `project_root_markers` is not specified, returns `Ok(None)`.
/// - If `project_root_markers` is specified, returns `Ok(Some(markers))` where
///   `markers` is a `Vec<String>` (including `Ok(Some(Vec::new()))` for an
///   empty array, which indicates that root detection should be disabled).
/// - Returns an error if `project_root_markers` is specified but is not an
///   array of strings.
pub fn project_root_markers_from_config(config: &TomlValue) -> io::Result<Option<Vec<String>>> {
    let Some(table) = config.as_table() else {
        return Ok(None);
    };
    let Some(markers_value) = table.get("project_root_markers") else {
        return Ok(None);
    };
    let TomlValue::Array(entries) = markers_value else {
        return Err(io::Error::new(
            io::ErrorKind::InvalidData,
            "project_root_markers must be an array of strings",
        ));
    };
    if entries.is_empty() {
        return Ok(Some(Vec::new()));
    }
    let mut markers = Vec::new();
    for entry in entries {
        let Some(marker) = entry.as_str() else {
            return Err(io::Error::new(
                io::ErrorKind::InvalidData,
                "project_root_markers must be an array of strings",
            ));
        };
        markers.push(marker.to_string());
    }
    Ok(Some(markers))

View on GitHub (pinned to 339751715c)

Solutions

1. Set `project_root_markers` to an array of strings in the config.

When it happens

Trigger: Thrown at codex-rs/config/src/project_root_markers.rs:24 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/3f0180d8aec95cb7. Report an issue: GitHub.