openai/codex · error · anyhow::Error

Unknown feature flag: {feature}

Error message

Unknown feature flag: {feature}

What it means

Error "Unknown feature flag: {feature}" thrown in openai/codex.

Source

Thrown at codex-rs/cli/src/main.rs:1003

impl FeatureToggles {
    fn to_overrides(&self) -> anyhow::Result<Vec<String>> {
        let mut v = Vec::new();
        for feature in &self.enable {
            Self::validate_feature(feature)?;
            v.push(format!("features.{feature}=true"));
        }
        for feature in &self.disable {
            Self::validate_feature(feature)?;
            v.push(format!("features.{feature}=false"));
        }
        Ok(v)
    }

    fn validate_feature(feature: &str) -> anyhow::Result<()> {
        if is_known_feature_key(feature) {
            Ok(())
        } else {
            anyhow::bail!("Unknown feature flag: {feature}")
        }
    }
}

#[derive(Debug, Parser)]
struct FeaturesCli {
    #[command(subcommand)]
    sub: FeaturesSubcommand,
}

#[derive(Debug, Parser)]
enum FeaturesSubcommand {
    /// List known features with their stage and effective state.
    List,
    /// Enable a feature in config.toml.
    Enable(FeatureSetArgs),
    /// Disable a feature in config.toml.
    Disable(FeatureSetArgs),

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/cli/src/main.rs:1003 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/a78076b0ff213eb0. Report an issue: GitHub.