codex/codex-rs/core/src/config/edit.rs

use crate::config::CONFIG_TOML_FILE;
use crate::config::types::McpServerConfig;
use crate::config::types::Notice;
use crate::path_utils::resolve_symlink_write_paths;
use crate::path_utils::write_atomically;
use anyhow::Context;
use codex_protocol::config_types::Personality;
use codex_protocol::config_types::TrustLevel;
use codex_protocol::openai_models::ReasoningEffort;
use std::collections::BTreeMap;
use std::path::Path;
use std::path::PathBuf;
use tokio::task;
use toml_edit::ArrayOfTables;
use toml_edit::DocumentMut;
use toml_edit::Item as TomlItem;
use toml_edit::Table as TomlTable;
use toml_edit::value;

/// Discrete config mutations supported by the persistence engine.
#[derive(Clone, Debug)]
pub enum ConfigEdit {
    /// Update the active (or default) model selection and optional reasoning effort.
    SetModel {
        model: Option<String>,
        effort: Option<ReasoningEffort>,
    },
    /// Update the active (or default) model personality.
    SetModelPersonality { personality: Option<Personality> },
    /// Toggle the acknowledgement flag under `[notice]`.
    SetNoticeHideFullAccessWarning(bool),
    /// Toggle the Windows world-writable directories warning acknowledgement flag.
    SetNoticeHideWorldWritableWarning(bool),
    /// Toggle the rate limit model nudge acknowledgement flag.
    SetNoticeHideRateLimitModelNudge(bool),
    /// Toggle the Windows onboarding acknowledgement flag.
    SetWindowsWslSetupAcknowledged(bool),
    /// Toggle the model migration prompt acknowledgement flag.
    SetNoticeHideModelMigrationPrompt(String, bool),
    /// Record that a migration prompt was shown for an old->new model mapping.
    RecordModelMigrationSeen { from: String, to: String },
    /// Replace the entire `[mcp_servers]` table.
    ReplaceMcpServers(BTreeMap<String, McpServerConfig>),
    /// Set or clear a skill config entry under `[[skills.config]]`.
    SetSkillConfig { path: PathBuf, enabled: bool },
    /// Set trust_level under `[projects."<path>"]`,
    /// migrating inline tables to explicit tables.
    SetProjectTrustLevel { path: PathBuf, level: TrustLevel },
    /// Set the value stored at the exact dotted path.
    SetPath {
        segments: Vec<String>,
        value: TomlItem,
    },
    /// Remove the value stored at the exact dotted path.
    ClearPath { segments: Vec<String> },
}

// TODO(jif) move to a dedicated file
mod document_helpers {
    use crate::config::types::McpServerConfig;
    use crate::config::types::McpServerTransportConfig;
    use toml_edit::Array as TomlArray;
    use toml_edit::InlineTable;
    use toml_edit::Item as TomlItem;
    use toml_edit::Table as TomlTable;
    use toml_edit::value;

    pub(super) fn ensure_table_for_write(item: &mut TomlItem) -> Option<&mut TomlTable> {
        match item {
            TomlItem::Table(table) => Some(table),
            TomlItem::Value(value) => {
                if let Some(inline) = value.as_inline_table() {
                    *item = TomlItem::Table(table_from_inline(inline));
                    item.as_table_mut()
                } else {
                    *item = TomlItem::Table(new_implicit_table());
                    item.as_table_mut()
                }
            }
            TomlItem::None => {
                *item = TomlItem::Table(new_implicit_table());
                item.as_table_mut()
            }
            _ => None,
        }
    }

    pub(super) fn ensure_table_for_read(item: &mut TomlItem) -> Option<&mut TomlTable> {
        match item {
            TomlItem::Table(table) => Some(table),
            TomlItem::Value(value) => {
                let inline = value.as_inline_table()?;
                *item = TomlItem::Table(table_from_inline(inline));
                item.as_table_mut()
            }
            _ => None,
        }
    }

    fn serialize_mcp_server_table(config: &McpServerConfig) -> TomlTable {
        let mut entry = TomlTable::new();
        entry.set_implicit(false);

        match &config.transport {
            McpServerTransportConfig::Stdio {
                command,
                args,
                env,
                env_vars,
                cwd,
            } => {
                entry["command"] = value(command.clone());
                if !args.is_empty() {
                    entry["args"] = array_from_iter(args.iter().cloned());
                }
                if let Some(env) = env
                    && !env.is_empty()
                {
                    entry["env"] = table_from_pairs(env.iter());
                }
                if !env_vars.is_empty() {
                    entry["env_vars"] = array_from_iter(env_vars.iter().cloned());
                }
                if let Some(cwd) = cwd {
                    entry["cwd"] = value(cwd.to_string_lossy().to_string());
                }
            }
            McpServerTransportConfig::StreamableHttp {
                url,
                bearer_token_env_var,
                http_headers,
                env_http_headers,
            } => {
                entry["url"] = value(url.clone());
                if let Some(env_var) = bearer_token_env_var {
                    entry["bearer_token_env_var"] = value(env_var.clone());
                }
                if let Some(headers) = http_headers
                    && !headers.is_empty()
                {
                    entry["http_headers"] = table_from_pairs(headers.iter());
                }
                if let Some(headers) = env_http_headers
                    && !headers.is_empty()
                {
                    entry["env_http_headers"] = table_from_pairs(headers.iter());
                }
            }
        }

        if !config.enabled {
            entry["enabled"] = value(false);
        }
        if let Some(timeout) = config.startup_timeout_sec {
            entry["startup_timeout_sec"] = value(timeout.as_secs_f64());
        }
        if let Some(timeout) = config.tool_timeout_sec {
            entry["tool_timeout_sec"] = value(timeout.as_secs_f64());
        }
        if let Some(enabled_tools) = &config.enabled_tools
            && !enabled_tools.is_empty()
        {
            entry["enabled_tools"] = array_from_iter(enabled_tools.iter().cloned());
        }
        if let Some(disabled_tools) = &config.disabled_tools
            && !disabled_tools.is_empty()
        {
            entry["disabled_tools"] = array_from_iter(disabled_tools.iter().cloned());
        }
        if let Some(scopes) = &config.scopes
            && !scopes.is_empty()
        {
            entry["scopes"] = array_from_iter(scopes.iter().cloned());
        }

        entry
    }

    pub(super) fn serialize_mcp_server(config: &McpServerConfig) -> TomlItem {
        TomlItem::Table(serialize_mcp_server_table(config))
    }

    pub(super) fn serialize_mcp_server_inline(config: &McpServerConfig) -> InlineTable {
        serialize_mcp_server_table(config).into_inline_table()
    }

    pub(super) fn merge_inline_table(existing: &mut InlineTable, replacement: InlineTable) {
        existing.retain(|key, _| replacement.get(key).is_some());

        for (key, value) in replacement.iter() {
            if let Some(existing_value) = existing.get_mut(key) {
                let mut updated_value = value.clone();
                *updated_value.decor_mut() = existing_value.decor().clone();
                *existing_value = updated_value;
            } else {
                existing.insert(key.to_string(), value.clone());
            }
        }
    }

    fn table_from_inline(inline: &InlineTable) -> TomlTable {
        let mut table = new_implicit_table();
        for (key, value) in inline.iter() {
            let mut value = value.clone();
            let decor = value.decor_mut();
            decor.set_suffix("");
            table.insert(key, TomlItem::Value(value));
        }
        table
    }

    pub(super) fn new_implicit_table() -> TomlTable {
        let mut table = TomlTable::new();
        table.set_implicit(true);
        table
    }

    fn array_from_iter<I>(iter: I) -> TomlItem
    where
        I: Iterator<Item = String>,
    {
        let mut array = TomlArray::new();
        for value in iter {
            array.push(value);
        }
        TomlItem::Value(array.into())
    }

    fn table_from_pairs<'a, I>(pairs: I) -> TomlItem
    where
        I: IntoIterator<Item = (&'a String, &'a String)>,
    {
        let mut entries: Vec<_> = pairs.into_iter().collect();
        entries.sort_by(|(a, _), (b, _)| a.cmp(b));
        let mut table = TomlTable::new();
        table.set_implicit(false);
        for (key, val) in entries {
            table.insert(key, value(val.clone()));
        }
        TomlItem::Table(table)
    }
}

struct ConfigDocument {
    doc: DocumentMut,
    profile: Option<String>,
}

#[derive(Copy, Clone)]
enum Scope {
    Global,
    Profile,
}

#[derive(Copy, Clone)]
enum TraversalMode {
    Create,
    Existing,
}

impl ConfigDocument {
    fn new(doc: DocumentMut, profile: Option<String>) -> Self {
        Self { doc, profile }
    }

    fn apply(&mut self, edit: &ConfigEdit) -> anyhow::Result<bool> {
        match edit {
            ConfigEdit::SetModel { model, effort } => Ok({
                let mut mutated = false;
                mutated |= self.write_profile_value(
                    &["model"],
                    model.as_ref().map(|model_value| value(model_value.clone())),
                );
                mutated |= self.write_profile_value(
                    &["model_reasoning_effort"],
                    effort.map(|effort| value(effort.to_string())),
                );
                mutated
            }),
            ConfigEdit::SetModelPersonality { personality } => Ok(self.write_profile_value(
                &["model_personality"],
                personality.map(|personality| value(personality.to_string())),
            )),
            ConfigEdit::SetNoticeHideFullAccessWarning(acknowledged) => Ok(self.write_value(
                Scope::Global,
                &[Notice::TABLE_KEY, "hide_full_access_warning"],
                value(*acknowledged),
            )),
            ConfigEdit::SetNoticeHideWorldWritableWarning(acknowledged) => Ok(self.write_value(
                Scope::Global,
                &[Notice::TABLE_KEY, "hide_world_writable_warning"],
                value(*acknowledged),
            )),
            ConfigEdit::SetNoticeHideRateLimitModelNudge(acknowledged) => Ok(self.write_value(
                Scope::Global,
                &[Notice::TABLE_KEY, "hide_rate_limit_model_nudge"],
                value(*acknowledged),
            )),
            ConfigEdit::SetNoticeHideModelMigrationPrompt(migration_config, acknowledged) => {
                Ok(self.write_value(
                    Scope::Global,
                    &[Notice::TABLE_KEY, migration_config.as_str()],
                    value(*acknowledged),
                ))
            }
            ConfigEdit::RecordModelMigrationSeen { from, to } => Ok(self.write_value(
                Scope::Global,
                &[Notice::TABLE_KEY, "model_migrations", from.as_str()],
                value(to.clone()),
            )),
            ConfigEdit::SetWindowsWslSetupAcknowledged(acknowledged) => Ok(self.write_value(
                Scope::Global,
                &["windows_wsl_setup_acknowledged"],
                value(*acknowledged),
            )),
            ConfigEdit::ReplaceMcpServers(servers) => Ok(self.replace_mcp_servers(servers)),
            ConfigEdit::SetSkillConfig { path, enabled } => {
                Ok(self.set_skill_config(path.as_path(), *enabled))
            }
            ConfigEdit::SetPath { segments, value } => Ok(self.insert(segments, value.clone())),
            ConfigEdit::ClearPath { segments } => Ok(self.clear_owned(segments)),
            ConfigEdit::SetProjectTrustLevel { path, level } => {
                // Delegate to the existing, tested logic in config.rs to
                // ensure tables are explicit and migration is preserved.
                crate::config::set_project_trust_level_inner(
                    &mut self.doc,
                    path.as_path(),
                    *level,
                )?;
                Ok(true)
            }
        }
    }

    fn write_profile_value(&mut self, segments: &[&str], value: Option<TomlItem>) -> bool {
        match value {
            Some(item) => self.write_value(Scope::Profile, segments, item),
            None => self.clear(Scope::Profile, segments),
        }
    }

    fn write_value(&mut self, scope: Scope, segments: &[&str], value: TomlItem) -> bool {
        let resolved = self.scoped_segments(scope, segments);
        self.insert(&resolved, value)
    }

    fn clear(&mut self, scope: Scope, segments: &[&str]) -> bool {
        let resolved = self.scoped_segments(scope, segments);
        self.remove(&resolved)
    }

    fn clear_owned(&mut self, segments: &[String]) -> bool {
        self.remove(segments)
    }

    fn replace_mcp_servers(&mut self, servers: &BTreeMap<String, McpServerConfig>) -> bool {
        if servers.is_empty() {
            return self.clear(Scope::Global, &["mcp_servers"]);
        }

        let root = self.doc.as_table_mut();
        if !root.contains_key("mcp_servers") {
            root.insert(
                "mcp_servers",
                TomlItem::Table(document_helpers::new_implicit_table()),
            );
        }

        let Some(item) = root.get_mut("mcp_servers") else {
            return false;
        };

        if document_helpers::ensure_table_for_write(item).is_none() {
            *item = TomlItem::Table(document_helpers::new_implicit_table());
        }

        let Some(table) = item.as_table_mut() else {
            return false;
        };

        let keys_to_remove: Vec<String> = table
            .iter()
            .map(|(key, _)| key.to_string())
            .filter(|key| !servers.contains_key(key.as_str()))
            .collect();

        for key in keys_to_remove {
            table.remove(&key);
        }

        for (name, config) in servers {
            if let Some(existing) = table.get_mut(name.as_str()) {
                if let TomlItem::Value(value) = existing
                    && let Some(inline) = value.as_inline_table_mut()
                {
                    let replacement = document_helpers::serialize_mcp_server_inline(config);
                    document_helpers::merge_inline_table(inline, replacement);
                } else {
                    *existing = document_helpers::serialize_mcp_server(config);
                }
            } else {
                table.insert(name, document_helpers::serialize_mcp_server(config));
            }
        }

        true
    }

    fn set_skill_config(&mut self, path: &Path, enabled: bool) -> bool {
        let normalized_path = normalize_skill_config_path(path);
        let mut remove_skills_table = false;
        let mut mutated = false;

        {
            let root = self.doc.as_table_mut();
            let skills_item = match root.get_mut("skills") {
                Some(item) => item,
                None => {
                    if enabled {
                        return false;
                    }
                    root.insert(
                        "skills",
                        TomlItem::Table(document_helpers::new_implicit_table()),
                    );
                    let Some(item) = root.get_mut("skills") else {
                        return false;
                    };
                    item
                }
            };

            if document_helpers::ensure_table_for_write(skills_item).is_none() {
                if enabled {
                    return false;
                }
                *skills_item = TomlItem::Table(document_helpers::new_implicit_table());
            }
            let Some(skills_table) = skills_item.as_table_mut() else {
                return false;
            };

            let config_item = match skills_table.get_mut("config") {
                Some(item) => item,
                None => {
                    if enabled {
                        return false;
                    }
                    skills_table.insert("config", TomlItem::ArrayOfTables(ArrayOfTables::new()));
                    let Some(item) = skills_table.get_mut("config") else {
                        return false;
                    };
                    item
                }
            };

            if !matches!(config_item, TomlItem::ArrayOfTables(_)) {
                if enabled {
                    return false;
                }
                *config_item = TomlItem::ArrayOfTables(ArrayOfTables::new());
            }

            let TomlItem::ArrayOfTables(overrides) = config_item else {
                return false;
            };

            let existing_index = overrides.iter().enumerate().find_map(|(idx, table)| {
                table
                    .get("path")
                    .and_then(|item| item.as_str())
                    .map(Path::new)
                    .map(normalize_skill_config_path)
                    .filter(|value| *value == normalized_path)
                    .map(|_| idx)
            });

            if enabled {
                if let Some(index) = existing_index {
                    overrides.remove(index);
                    mutated = true;
                    if overrides.is_empty() {
                        skills_table.remove("config");
                        if skills_table.is_empty() {
                            remove_skills_table = true;
                        }
                    }
                }
            } else if let Some(index) = existing_index {
                for (idx, table) in overrides.iter_mut().enumerate() {
                    if idx == index {
                        table["path"] = value(normalized_path);
                        table["enabled"] = value(false);
                        mutated = true;
                        break;
                    }
                }
            } else {
                let mut entry = TomlTable::new();
                entry.set_implicit(false);
                entry["path"] = value(normalized_path);
                entry["enabled"] = value(false);
                overrides.push(entry);
                mutated = true;
            }
        }

        if remove_skills_table {
            let root = self.doc.as_table_mut();
            root.remove("skills");
        }

        mutated
    }

    fn scoped_segments(&self, scope: Scope, segments: &[&str]) -> Vec<String> {
        let resolved: Vec<String> = segments
            .iter()
            .map(|segment| (*segment).to_string())
            .collect();

        if matches!(scope, Scope::Profile)
            && resolved.first().is_none_or(|segment| segment != "profiles")
            && let Some(profile) = self.profile.as_deref()
        {
            let mut scoped = Vec::with_capacity(resolved.len() + 2);
            scoped.push("profiles".to_string());
            scoped.push(profile.to_string());
            scoped.extend(resolved);
            return scoped;
        }

        resolved
    }

    fn insert(&mut self, segments: &[String], value: TomlItem) -> bool {
        let Some((last, parents)) = segments.split_last() else {
            return false;
        };

        let Some(parent) = self.descend(parents, TraversalMode::Create) else {
            return false;
        };

        let mut value = value;
        if let Some(existing) = parent.get(last) {
            Self::preserve_decor(existing, &mut value);
        }
        parent[last] = value;
        true
    }

    fn remove(&mut self, segments: &[String]) -> bool {
        let Some((last, parents)) = segments.split_last() else {
            return false;
        };

        let Some(parent) = self.descend(parents, TraversalMode::Existing) else {
            return false;
        };

        parent.remove(last).is_some()
    }

    fn descend(&mut self, segments: &[String], mode: TraversalMode) -> Option<&mut TomlTable> {
        let mut current = self.doc.as_table_mut();

        for segment in segments {
            match mode {
                TraversalMode::Create => {
                    if !current.contains_key(segment.as_str()) {
                        current.insert(
                            segment.as_str(),
                            TomlItem::Table(document_helpers::new_implicit_table()),
                        );
                    }

                    let item = current.get_mut(segment.as_str())?;
                    current = document_helpers::ensure_table_for_write(item)?;
                }
                TraversalMode::Existing => {
                    let item = current.get_mut(segment.as_str())?;
                    current = document_helpers::ensure_table_for_read(item)?;
                }
            }
        }

        Some(current)
    }

    fn preserve_decor(existing: &TomlItem, replacement: &mut TomlItem) {
        match (existing, replacement) {
            (TomlItem::Table(existing_table), TomlItem::Table(replacement_table)) => {
                replacement_table
                    .decor_mut()
                    .clone_from(existing_table.decor());
                for (key, existing_item) in existing_table.iter() {
                    if let (Some(existing_key), Some(mut replacement_key)) =
                        (existing_table.key(key), replacement_table.key_mut(key))
                    {
                        replacement_key
                            .leaf_decor_mut()
                            .clone_from(existing_key.leaf_decor());
                        replacement_key
                            .dotted_decor_mut()
                            .clone_from(existing_key.dotted_decor());
                    }
                    if let Some(replacement_item) = replacement_table.get_mut(key) {
                        Self::preserve_decor(existing_item, replacement_item);
                    }
                }
            }
            (TomlItem::Value(existing_value), TomlItem::Value(replacement_value)) => {
                replacement_value
                    .decor_mut()
                    .clone_from(existing_value.decor());
            }
            _ => {}
        }
    }
}

fn normalize_skill_config_path(path: &Path) -> String {
    dunce::canonicalize(path)
        .unwrap_or_else(|_| path.to_path_buf())
        .to_string_lossy()
        .to_string()
}

/// Persist edits using a blocking strategy.
pub fn apply_blocking(
    codex_home: &Path,
    profile: Option<&str>,
    edits: &[ConfigEdit],
) -> anyhow::Result<()> {
    if edits.is_empty() {
        return Ok(());
    }

    let config_path = codex_home.join(CONFIG_TOML_FILE);
    let write_paths = resolve_symlink_write_paths(&config_path)?;
    let serialized = match write_paths.read_path {
        Some(path) => match std::fs::read_to_string(&path) {
            Ok(contents) => contents,
            Err(err) if err.kind() == std::io::ErrorKind::NotFound => String::new(),
            Err(err) => return Err(err.into()),
        },
        None => String::new(),
    };

    let doc = if serialized.is_empty() {
        DocumentMut::new()
    } else {
        serialized.parse::<DocumentMut>()?
    };

    let profile = profile.map(ToOwned::to_owned).or_else(|| {
        doc.get("profile")
            .and_then(|item| item.as_str())
            .map(ToOwned::to_owned)
    });

    let mut document = ConfigDocument::new(doc, profile);
    let mut mutated = false;

    for edit in edits {
        mutated |= document.apply(edit)?;
    }

    if !mutated {
        return Ok(());
    }

    write_atomically(&write_paths.write_path, &document.doc.to_string()).with_context(|| {
        format!(
            "failed to persist config.toml at {}",
            write_paths.write_path.display()
        )
    })?;

    Ok(())
}

/// Persist edits asynchronously by offloading the blocking writer.
pub async fn apply(
    codex_home: &Path,
    profile: Option<&str>,
    edits: Vec<ConfigEdit>,
) -> anyhow::Result<()> {
    let codex_home = codex_home.to_path_buf();
    let profile = profile.map(ToOwned::to_owned);
    task::spawn_blocking(move || apply_blocking(&codex_home, profile.as_deref(), &edits))
        .await
        .context("config persistence task panicked")?
}

/// Fluent builder to batch config edits and apply them atomically.
#[derive(Default)]
pub struct ConfigEditsBuilder {
    codex_home: PathBuf,
    profile: Option<String>,
    edits: Vec<ConfigEdit>,
}

impl ConfigEditsBuilder {
    pub fn new(codex_home: &Path) -> Self {
        Self {
            codex_home: codex_home.to_path_buf(),
            profile: None,
            edits: Vec::new(),
        }
    }

    pub fn with_profile(mut self, profile: Option<&str>) -> Self {
        self.profile = profile.map(ToOwned::to_owned);
        self
    }

    pub fn set_model(mut self, model: Option<&str>, effort: Option<ReasoningEffort>) -> Self {
        self.edits.push(ConfigEdit::SetModel {
            model: model.map(ToOwned::to_owned),
            effort,
        });
        self
    }

    pub fn set_model_personality(mut self, personality: Option<Personality>) -> Self {
        self.edits
            .push(ConfigEdit::SetModelPersonality { personality });
        self
    }

    pub fn set_hide_full_access_warning(mut self, acknowledged: bool) -> Self {
        self.edits
            .push(ConfigEdit::SetNoticeHideFullAccessWarning(acknowledged));
        self
    }

    pub fn set_hide_world_writable_warning(mut self, acknowledged: bool) -> Self {
        self.edits
            .push(ConfigEdit::SetNoticeHideWorldWritableWarning(acknowledged));
        self
    }

    pub fn set_hide_rate_limit_model_nudge(mut self, acknowledged: bool) -> Self {
        self.edits
            .push(ConfigEdit::SetNoticeHideRateLimitModelNudge(acknowledged));
        self
    }

    pub fn set_hide_model_migration_prompt(mut self, model: &str, acknowledged: bool) -> Self {
        self.edits
            .push(ConfigEdit::SetNoticeHideModelMigrationPrompt(
                model.to_string(),
                acknowledged,
            ));
        self
    }

    pub fn record_model_migration_seen(mut self, from: &str, to: &str) -> Self {
        self.edits.push(ConfigEdit::RecordModelMigrationSeen {
            from: from.to_string(),
            to: to.to_string(),
        });
        self
    }

    pub fn set_windows_wsl_setup_acknowledged(mut self, acknowledged: bool) -> Self {
        self.edits
            .push(ConfigEdit::SetWindowsWslSetupAcknowledged(acknowledged));
        self
    }

    pub fn replace_mcp_servers(mut self, servers: &BTreeMap<String, McpServerConfig>) -> Self {
        self.edits
            .push(ConfigEdit::ReplaceMcpServers(servers.clone()));
        self
    }

    pub fn set_project_trust_level<P: Into<PathBuf>>(
        mut self,
        project_path: P,
        trust_level: TrustLevel,
    ) -> Self {
        self.edits.push(ConfigEdit::SetProjectTrustLevel {
            path: project_path.into(),
            level: trust_level,
        });
        self
    }

    /// Enable or disable a feature flag by key under the `[features]` table.
    pub fn set_feature_enabled(mut self, key: &str, enabled: bool) -> Self {
        self.edits.push(ConfigEdit::SetPath {
            segments: vec!["features".to_string(), key.to_string()],
            value: value(enabled),
        });
        self
    }

    pub fn with_edits<I>(mut self, edits: I) -> Self
    where
        I: IntoIterator<Item = ConfigEdit>,
    {
        self.edits.extend(edits);
        self
    }

    /// Apply edits on a blocking thread.
    pub fn apply_blocking(self) -> anyhow::Result<()> {
        apply_blocking(&self.codex_home, self.profile.as_deref(), &self.edits)
    }

    /// Apply edits asynchronously via a blocking offload.
    pub async fn apply(self) -> anyhow::Result<()> {
        task::spawn_blocking(move || {
            apply_blocking(&self.codex_home, self.profile.as_deref(), &self.edits)
        })
        .await
        .context("config persistence task panicked")?
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::config::types::McpServerTransportConfig;
    use codex_protocol::openai_models::ReasoningEffort;
    use pretty_assertions::assert_eq;
    #[cfg(unix)]
    use std::os::unix::fs::symlink;
    use tempfile::tempdir;
    use toml::Value as TomlValue;

    #[test]
    fn blocking_set_model_top_level() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: Some("gpt-5.1-codex".to_string()),
                effort: Some(ReasoningEffort::High),
            }],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"model = "gpt-5.1-codex"
model_reasoning_effort = "high"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn builder_with_edits_applies_custom_paths() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        ConfigEditsBuilder::new(codex_home)
            .with_edits(vec![ConfigEdit::SetPath {
                segments: vec!["enabled".to_string()],
                value: value(true),
            }])
            .apply_blocking()
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert_eq!(contents, "enabled = true\n");
    }

    #[test]
    fn set_skill_config_writes_disabled_entry() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        ConfigEditsBuilder::new(codex_home)
            .with_edits([ConfigEdit::SetSkillConfig {
                path: PathBuf::from("/tmp/skills/demo/SKILL.md"),
                enabled: false,
            }])
            .apply_blocking()
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[[skills.config]]
path = "/tmp/skills/demo/SKILL.md"
enabled = false
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn set_skill_config_removes_entry_when_enabled() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[[skills.config]]
path = "/tmp/skills/demo/SKILL.md"
enabled = false
"#,
        )
        .expect("seed config");

        ConfigEditsBuilder::new(codex_home)
            .with_edits([ConfigEdit::SetSkillConfig {
                path: PathBuf::from("/tmp/skills/demo/SKILL.md"),
                enabled: true,
            }])
            .apply_blocking()
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert_eq!(contents, "");
    }

    #[test]
    fn blocking_set_model_preserves_inline_table_contents() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        // Seed with inline tables for profiles to simulate common user config.
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"profile = "fast"

profiles = { fast = { model = "gpt-4o", sandbox_mode = "strict" } }
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: Some("o4-mini".to_string()),
                effort: None,
            }],
        )
        .expect("persist");

        let raw = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let value: TomlValue = toml::from_str(&raw).expect("parse config");

        // Ensure sandbox_mode is preserved under profiles.fast and model updated.
        let profiles_tbl = value
            .get("profiles")
            .and_then(|v| v.as_table())
            .expect("profiles table");
        let fast_tbl = profiles_tbl
            .get("fast")
            .and_then(|v| v.as_table())
            .expect("fast table");
        assert_eq!(
            fast_tbl.get("sandbox_mode").and_then(|v| v.as_str()),
            Some("strict")
        );
        assert_eq!(
            fast_tbl.get("model").and_then(|v| v.as_str()),
            Some("o4-mini")
        );
    }

    #[cfg(unix)]
    #[test]
    fn blocking_set_model_writes_through_symlink_chain() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        let target_dir = tempdir().expect("target dir");
        let target_path = target_dir.path().join(CONFIG_TOML_FILE);
        let link_path = codex_home.join("config-link.toml");
        let config_path = codex_home.join(CONFIG_TOML_FILE);

        symlink(&target_path, &link_path).expect("symlink link");
        symlink("config-link.toml", &config_path).expect("symlink config");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: Some("gpt-5.1-codex".to_string()),
                effort: Some(ReasoningEffort::High),
            }],
        )
        .expect("persist");

        let meta = std::fs::symlink_metadata(&config_path).expect("config metadata");
        assert!(meta.file_type().is_symlink());

        let contents = std::fs::read_to_string(&target_path).expect("read target");
        let expected = r#"model = "gpt-5.1-codex"
model_reasoning_effort = "high"
"#;
        assert_eq!(contents, expected);
    }

    #[cfg(unix)]
    #[test]
    fn blocking_set_model_replaces_symlink_on_cycle() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        let link_a = codex_home.join("a.toml");
        let link_b = codex_home.join("b.toml");
        let config_path = codex_home.join(CONFIG_TOML_FILE);

        symlink("b.toml", &link_a).expect("symlink a");
        symlink("a.toml", &link_b).expect("symlink b");
        symlink("a.toml", &config_path).expect("symlink config");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: Some("gpt-5.1-codex".to_string()),
                effort: None,
            }],
        )
        .expect("persist");

        let meta = std::fs::symlink_metadata(&config_path).expect("config metadata");
        assert!(!meta.file_type().is_symlink());

        let contents = std::fs::read_to_string(&config_path).expect("read config");
        let expected = r#"model = "gpt-5.1-codex"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn batch_write_table_upsert_preserves_inline_comments() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        let original = r#"approval_policy = "never"

[mcp_servers.linear]
name = "linear"
# ok
url = "https://linear.example"

[mcp_servers.linear.http_headers]
foo = "bar"

[sandbox_workspace_write]
# ok 3
network_access = false
"#;
        std::fs::write(codex_home.join(CONFIG_TOML_FILE), original).expect("seed config");

        apply_blocking(
            codex_home,
            None,
            &[
                ConfigEdit::SetPath {
                    segments: vec![
                        "mcp_servers".to_string(),
                        "linear".to_string(),
                        "url".to_string(),
                    ],
                    value: value("https://linear.example/v2"),
                },
                ConfigEdit::SetPath {
                    segments: vec![
                        "sandbox_workspace_write".to_string(),
                        "network_access".to_string(),
                    ],
                    value: value(true),
                },
            ],
        )
        .expect("apply");

        let updated =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"approval_policy = "never"

[mcp_servers.linear]
name = "linear"
# ok
url = "https://linear.example/v2"

[mcp_servers.linear.http_headers]
foo = "bar"

[sandbox_workspace_write]
# ok 3
network_access = true
"#;
        assert_eq!(updated, expected);
    }

    #[test]
    fn blocking_clear_model_removes_inline_table_entry() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"profile = "fast"

profiles = { fast = { model = "gpt-4o", sandbox_mode = "strict" } }
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: None,
                effort: Some(ReasoningEffort::High),
            }],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"profile = "fast"

[profiles.fast]
sandbox_mode = "strict"
model_reasoning_effort = "high"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_model_scopes_to_active_profile() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"profile = "team"

[profiles.team]
model_reasoning_effort = "low"
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetModel {
                model: Some("o5-preview".to_string()),
                effort: Some(ReasoningEffort::Minimal),
            }],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"profile = "team"

[profiles.team]
model_reasoning_effort = "minimal"
model = "o5-preview"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_model_with_explicit_profile() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[profiles."team a"]
model = "gpt-5.1-codex"
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            Some("team a"),
            &[ConfigEdit::SetModel {
                model: Some("o4-mini".to_string()),
                effort: None,
            }],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[profiles."team a"]
model = "o4-mini"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_hide_full_access_warning_preserves_table() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"# Global comment

[notice]
# keep me
existing = "value"
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetNoticeHideFullAccessWarning(true)],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"# Global comment

[notice]
# keep me
existing = "value"
hide_full_access_warning = true
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_hide_rate_limit_model_nudge_preserves_table() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[notice]
existing = "value"
"#,
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetNoticeHideRateLimitModelNudge(true)],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[notice]
existing = "value"
hide_rate_limit_model_nudge = true
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_hide_gpt5_1_migration_prompt_preserves_table() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[notice]
existing = "value"
"#,
        )
        .expect("seed");
        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetNoticeHideModelMigrationPrompt(
                "hide_gpt5_1_migration_prompt".to_string(),
                true,
            )],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[notice]
existing = "value"
hide_gpt5_1_migration_prompt = true
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_set_hide_gpt_5_1_codex_max_migration_prompt_preserves_table() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[notice]
existing = "value"
"#,
        )
        .expect("seed");
        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetNoticeHideModelMigrationPrompt(
                "hide_gpt-5.1-codex-max_migration_prompt".to_string(),
                true,
            )],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[notice]
existing = "value"
"hide_gpt-5.1-codex-max_migration_prompt" = true
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_record_model_migration_seen_preserves_table() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[notice]
existing = "value"
"#,
        )
        .expect("seed");
        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::RecordModelMigrationSeen {
                from: "gpt-5".to_string(),
                to: "gpt-5.1".to_string(),
            }],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[notice]
existing = "value"

[notice.model_migrations]
gpt-5 = "gpt-5.1"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_replace_mcp_servers_round_trips() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        let mut servers = BTreeMap::new();
        servers.insert(
            "stdio".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::Stdio {
                    command: "cmd".to_string(),
                    args: vec!["--flag".to_string()],
                    env: Some(
                        [
                            ("B".to_string(), "2".to_string()),
                            ("A".to_string(), "1".to_string()),
                        ]
                        .into_iter()
                        .collect(),
                    ),
                    env_vars: vec!["FOO".to_string()],
                    cwd: None,
                },
                enabled: true,
                disabled_reason: None,
                startup_timeout_sec: None,
                tool_timeout_sec: None,
                enabled_tools: Some(vec!["one".to_string(), "two".to_string()]),
                disabled_tools: None,
                scopes: None,
            },
        );

        servers.insert(
            "http".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::StreamableHttp {
                    url: "https://example.com".to_string(),
                    bearer_token_env_var: Some("TOKEN".to_string()),
                    http_headers: Some(
                        [("Z-Header".to_string(), "z".to_string())]
                            .into_iter()
                            .collect(),
                    ),
                    env_http_headers: None,
                },
                enabled: false,
                disabled_reason: None,
                startup_timeout_sec: Some(std::time::Duration::from_secs(5)),
                tool_timeout_sec: None,
                enabled_tools: None,
                disabled_tools: Some(vec!["forbidden".to_string()]),
                scopes: None,
            },
        );

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::ReplaceMcpServers(servers.clone())],
        )
        .expect("persist");

        let raw = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = "\
[mcp_servers.http]
url = \"https://example.com\"
bearer_token_env_var = \"TOKEN\"
enabled = false
startup_timeout_sec = 5.0
disabled_tools = [\"forbidden\"]

[mcp_servers.http.http_headers]
Z-Header = \"z\"

[mcp_servers.stdio]
command = \"cmd\"
args = [\"--flag\"]
env_vars = [\"FOO\"]
enabled_tools = [\"one\", \"two\"]

[mcp_servers.stdio.env]
A = \"1\"
B = \"2\"
";
        assert_eq!(raw, expected);
    }

    #[test]
    fn blocking_replace_mcp_servers_preserves_inline_comments() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[mcp_servers]
# keep me
foo = { command = "cmd" }
"#,
        )
        .expect("seed");

        let mut servers = BTreeMap::new();
        servers.insert(
            "foo".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::Stdio {
                    command: "cmd".to_string(),
                    args: Vec::new(),
                    env: None,
                    env_vars: Vec::new(),
                    cwd: None,
                },
                enabled: true,
                disabled_reason: None,
                startup_timeout_sec: None,
                tool_timeout_sec: None,
                enabled_tools: None,
                disabled_tools: None,
                scopes: None,
            },
        );

        apply_blocking(codex_home, None, &[ConfigEdit::ReplaceMcpServers(servers)])
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[mcp_servers]
# keep me
foo = { command = "cmd" }
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_replace_mcp_servers_preserves_inline_comment_suffix() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[mcp_servers]
foo = { command = "cmd" } # keep me
"#,
        )
        .expect("seed");

        let mut servers = BTreeMap::new();
        servers.insert(
            "foo".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::Stdio {
                    command: "cmd".to_string(),
                    args: Vec::new(),
                    env: None,
                    env_vars: Vec::new(),
                    cwd: None,
                },
                enabled: false,
                disabled_reason: None,
                startup_timeout_sec: None,
                tool_timeout_sec: None,
                enabled_tools: None,
                disabled_tools: None,
                scopes: None,
            },
        );

        apply_blocking(codex_home, None, &[ConfigEdit::ReplaceMcpServers(servers)])
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[mcp_servers]
foo = { command = "cmd" , enabled = false } # keep me
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_replace_mcp_servers_preserves_inline_comment_after_removing_keys() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[mcp_servers]
foo = { command = "cmd", args = ["--flag"] } # keep me
"#,
        )
        .expect("seed");

        let mut servers = BTreeMap::new();
        servers.insert(
            "foo".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::Stdio {
                    command: "cmd".to_string(),
                    args: Vec::new(),
                    env: None,
                    env_vars: Vec::new(),
                    cwd: None,
                },
                enabled: true,
                disabled_reason: None,
                startup_timeout_sec: None,
                tool_timeout_sec: None,
                enabled_tools: None,
                disabled_tools: None,
                scopes: None,
            },
        );

        apply_blocking(codex_home, None, &[ConfigEdit::ReplaceMcpServers(servers)])
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[mcp_servers]
foo = { command = "cmd"} # keep me
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_replace_mcp_servers_preserves_inline_comment_prefix_on_update() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            r#"[mcp_servers]
# keep me
foo = { command = "cmd" }
"#,
        )
        .expect("seed");

        let mut servers = BTreeMap::new();
        servers.insert(
            "foo".to_string(),
            McpServerConfig {
                transport: McpServerTransportConfig::Stdio {
                    command: "cmd".to_string(),
                    args: Vec::new(),
                    env: None,
                    env_vars: Vec::new(),
                    cwd: None,
                },
                enabled: false,
                disabled_reason: None,
                startup_timeout_sec: None,
                tool_timeout_sec: None,
                enabled_tools: None,
                disabled_tools: None,
                scopes: None,
            },
        );

        apply_blocking(codex_home, None, &[ConfigEdit::ReplaceMcpServers(servers)])
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"[mcp_servers]
# keep me
foo = { command = "cmd" , enabled = false }
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_clear_path_noop_when_missing() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::ClearPath {
                segments: vec!["missing".to_string()],
            }],
        )
        .expect("apply");

        assert!(
            !codex_home.join(CONFIG_TOML_FILE).exists(),
            "config.toml should not be created on noop"
        );
    }

    #[test]
    fn blocking_set_path_updates_notifications() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        let item = value(false);
        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::SetPath {
                segments: vec!["tui".to_string(), "notifications".to_string()],
                value: item,
            }],
        )
        .expect("apply");

        let raw = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let config: TomlValue = toml::from_str(&raw).expect("parse config");
        let notifications = config
            .get("tui")
            .and_then(|item| item.as_table())
            .and_then(|tbl| tbl.get("notifications"))
            .and_then(toml::Value::as_bool);
        assert_eq!(notifications, Some(false));
    }

    #[tokio::test]
    async fn async_builder_set_model_persists() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path().to_path_buf();

        ConfigEditsBuilder::new(&codex_home)
            .set_model(Some("gpt-5.1-codex"), Some(ReasoningEffort::High))
            .apply()
            .await
            .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let expected = r#"model = "gpt-5.1-codex"
model_reasoning_effort = "high"
"#;
        assert_eq!(contents, expected);
    }

    #[test]
    fn blocking_builder_set_model_round_trips_back_and_forth() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();

        let initial_expected = r#"model = "o4-mini"
model_reasoning_effort = "low"
"#;
        ConfigEditsBuilder::new(codex_home)
            .set_model(Some("o4-mini"), Some(ReasoningEffort::Low))
            .apply_blocking()
            .expect("persist initial");
        let mut contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert_eq!(contents, initial_expected);

        let updated_expected = r#"model = "gpt-5.1-codex"
model_reasoning_effort = "high"
"#;
        ConfigEditsBuilder::new(codex_home)
            .set_model(Some("gpt-5.1-codex"), Some(ReasoningEffort::High))
            .apply_blocking()
            .expect("persist update");
        contents = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert_eq!(contents, updated_expected);

        ConfigEditsBuilder::new(codex_home)
            .set_model(Some("o4-mini"), Some(ReasoningEffort::Low))
            .apply_blocking()
            .expect("persist revert");
        contents = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert_eq!(contents, initial_expected);
    }

    #[tokio::test]
    async fn blocking_set_asynchronous_helpers_available() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path().to_path_buf();

        ConfigEditsBuilder::new(&codex_home)
            .set_hide_full_access_warning(true)
            .apply()
            .await
            .expect("persist");

        let raw = std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        let notice = toml::from_str::<TomlValue>(&raw)
            .expect("parse config")
            .get("notice")
            .and_then(|item| item.as_table())
            .and_then(|tbl| tbl.get("hide_full_access_warning"))
            .and_then(toml::Value::as_bool);
        assert_eq!(notice, Some(true));
    }

    #[test]
    fn replace_mcp_servers_blocking_clears_table_when_empty() {
        let tmp = tempdir().expect("tmpdir");
        let codex_home = tmp.path();
        std::fs::write(
            codex_home.join(CONFIG_TOML_FILE),
            "[mcp_servers]\nfoo = { command = \"cmd\" }\n",
        )
        .expect("seed");

        apply_blocking(
            codex_home,
            None,
            &[ConfigEdit::ReplaceMcpServers(BTreeMap::new())],
        )
        .expect("persist");

        let contents =
            std::fs::read_to_string(codex_home.join(CONFIG_TOML_FILE)).expect("read config");
        assert!(!contents.contains("mcp_servers"));
    }
}