openai/codex · error

failed to serialize default config: {e}

Error message

failed to serialize default config: {e}

What it means

Error "failed to serialize default config: {e}" thrown in openai/codex.

Source

Thrown at codex-rs/core/src/config/mod.rs:1856

    pub async fn load_default_with_cli_overrides(
        cli_overrides: Vec<(String, TomlValue)>,
    ) -> std::io::Result<Self> {
        let codex_home = find_codex_home()?;
        Self::load_default_with_cli_overrides_for_codex_home(
            codex_home.to_path_buf(),
            cli_overrides,
        )
        .await
    }

    /// Load a default configuration for a specific Codex home without reading
    /// user, project, or system config layers.
    pub async fn load_default_with_cli_overrides_for_codex_home(
        codex_home: PathBuf,
        cli_overrides: Vec<(String, TomlValue)>,
    ) -> std::io::Result<Self> {
        let mut merged = toml::Value::try_from(ConfigToml::default()).map_err(|e| {
            std::io::Error::new(
                std::io::ErrorKind::InvalidData,
                format!("failed to serialize default config: {e}"),
            )
        })?;
        let cli_layer = codex_config::build_cli_overrides_layer(&cli_overrides);
        codex_config::merge_toml_values(&mut merged, &cli_layer);
        let codex_home = AbsolutePathBuf::from_absolute_path_checked(codex_home)?;
        let config_toml = deserialize_config_toml_with_base(merged, &codex_home)?;
        Self::load_config_with_layer_stack(
            LOCAL_FS.as_ref(),
            config_toml,
            ConfigOverrides::default(),
            codex_home,
            ConfigLayerStack::default(),
        )
        .await
    }
    /// This is a secondary way of creating [Config], which is appropriate when

View on GitHub (pinned to 339751715c)

Solutions

1. Internal serialization failure of the default config; report it with the underlying error.

When it happens

Trigger: Thrown at codex-rs/core/src/config/mod.rs:1856 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/bb34d66c696a4b0f. Report an issue: GitHub.