Variant title naming collision detected: {collision_key} (ge

Error message

Variant title naming collision detected: {collision_key} (generated name: {name})

What it means

Error "Variant title naming collision detected: {collision_key} (generated name: {name})" thrown in openai/codex.

Source

Thrown at codex-rs/app-server-protocol/src/export.rs:1815

    let mut seen = HashSet::new();

    for variant in variants.iter() {
        if let Some(name) = variant_title(variant) {
            seen.insert(name.to_owned());
        }
    }

    for variant in variants.iter_mut() {
        let mut variant_name = variant_title(variant).map(str::to_owned);

        if variant_name.is_none()
            && let Some(base_name) = base
            && let Some(name) = variant_definition_name(base_name, variant)
        {
            let candidate = name.clone();
            if seen.contains(&candidate) {
                let collision_key = variant_title_collision_key(base_name, &name, variant);
                panic!(
                    "Variant title naming collision detected: {collision_key} (generated name: {name})"
                );
            }
            if let Some(obj) = variant.as_object_mut() {
                obj.insert("title".into(), Value::String(candidate.clone()));
            }
            seen.insert(candidate.clone());
            variant_name = Some(candidate);
        }

        if let Some(name) = variant_name.as_deref()
            && let Some(obj) = variant.as_object_mut()
            && let Some(Value::Object(props)) = obj.get_mut("properties")
        {
            set_discriminator_titles(props, name);
        }

        annotate_schema(variant, base);

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/app-server-protocol/src/export.rs:1815 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/6aa23de723d03d59. Report an issue: GitHub.