diff --git a/docs/contracts/Sync-v1契约.md b/docs/contracts/Sync-v1契约.md
index 5658729..76df0c8 100644
--- a/docs/contracts/Sync-v1契约.md
+++ b/docs/contracts/Sync-v1契约.md
@@ -8,7 +8,7 @@ Workspace schema 3 新增持久绑定、上传作业与远端 heads。首次向
 
 Rust HTTP 客户端已实现握手、登录、空远端复核、1 MiB 分块上传、查询 offset 续传、complete 和 Revision 提交。默认 HTTPS，测试 HTTP 必须显式启用；不跟随重定向，令牌不进入 URL，响应有大小限制。真实本地 HTTP Fixture 已验证 20 次编辑形成 20 个正确远端基线、同一提交重复 100 次无重复 revision。此 Fixture 使用 SQLite/磁盘对象，不替代生产 PostgreSQL/MinIO 验收。
 
-此增量尚未开放桌面 Sync capability：Stronghold 会话接入、冲突解决与 UI、附件故障矩阵及数据分类仍在实施。
+桌面 Sync capability 已接入 Stronghold 会话、冲突解决 UI、附件续传与逻辑数据分类；本地真实 HTTP Fixture 只证明客户端协议行为，不替代 PostgreSQL/MinIO、备份恢复和发布包验收。
 
 Workspace schema 4 增加持久 inbox、分页 boundary 和冲突记录，并为文件移动/删除日志记录 local/remote 来源。下载先验证长度与摘要，再登记 inbox；文件操作通过 Workspace journal 应用后才推进 cursor。进程在文件提交与 cursor 提交之间重启时使用操作回执去重。远端新增保留 file_id，远端移动/删除不回流 outbox。本机历史提交回放仅确认操作，不回退新编辑。本地待上传修改或摘要不符产生冲突，保存本地与远端内容引用后推进接收游标；同一文件保留最新待处理冲突，旧冲突记录仍保留。空本地库可以绑定已有远端并仅拉取。
 
@@ -63,7 +63,7 @@ Host 在写入 journal、捕获外部修改和上传前验证记录；未知字
 
 桌面 Task CRUD 经 Host records broker，操作重放返回原始记录且同 ID 不同字段拒绝；Core 不以全局 SQLite 作为任务来源。已明确归属于当前 Vault 的旧 Task 表在首次访问时逐条迁移，完成后设置所有权标记，来源表保留；未分配 Vault 的全局旧数据不猜测归属。文件身份采纳时，任务链接通过 Host 别名解析，并在上传队列物化前将规范化引用写成新的逻辑记录。
 
-用户 Skill 的独立白名单与适配器见下文；可选对话等其他类别仍须逐类定义，不得用复制任意 JSON/SQLite 代替。
+用户 Skill 与六类可选数据的独立白名单见下文；所有类别均使用逐字段逻辑记录，不得用复制任意 JSON/SQLite 代替。
 
 
 ## 主题与编辑器偏好记录 v1
@@ -108,10 +108,22 @@ Core 通过绑定 Vault 的 workspace.persona.get/write RPC 读写；Host 先校
 逻辑记录的“另存副本并采用远端”可将原始记录内容导出为 `attachments/*.txt`；文本副本作为普通附件同步，拥有独立 file_id，不作为活动设置自动应用。副本目标必须属于同步白名单；若目标本身位于记录命名空间，还必须与原始记录 kind/id/schema 一致。这些检查在持久化冲突决定之前完成，因此无效路径不占用该冲突的解决选择。
 
 
-## 可选记录范围（Workspace schema 11）
+## 对话、Agent、Provider 与安装清单记录 v1
 
-人设与布局默认仅保存在本机。用户在同步设置中分别选择 persona/layout 后才参与传输；选择保存在本机 Vault 数据库，不随逻辑记录上传。已有活动绑定时不得直接改变范围，必须解除绑定、调整选择、重新预览合并；预览摘要包含范围，旧范围的预览不能用于绑定新范围。
+对话使用 `opennexus-records/v1/conversations/conversation_<32位小写十六进制>.json`。data 只包含 title、active_leaf、created_at_ms、updated_at_ms 和 messages；每条 message 只包含 message_id、parent_message_id、role、content、thinking、attachments、created_at_ms。消息 ID 唯一，父节点和 active_leaf 必须引用本记录中的消息；role 限 user/assistant/system，附件只保存可移植的相对引用。单条正文或思考最多 256 KiB，记录整体仍受 1 MiB 上限约束。
+
+已结束的 Agent 历史使用 `opennexus-records/v1/agent-history/agent_run_<32位小写十六进制>.json`。data 只包含 status、input、output、model、skill_id、error_code、error_message、token_usage、created_at_ms、updated_at_ms；status 仅允许 completed/failed/cancelled。queued、running、waiting_permission 不可编码，目标设备不会恢复运行、继续工具调用或继承许可。
+
+一般 Provider 参数使用 `opennexus-records/v1/provider-settings/provider_<32位小写十六进制>.json`。data 只包含 version、provider_type、name、base_url、default_model、enabled、capabilities；base_url 必须是无用户信息、查询或 fragment 的 HTTP(S) URL。credential_id、API Key、Header、令牌、请求秘密和设备凭据状态不是合法字段，目标设备需单独配置凭据。
+
+安装清单使用 `opennexus-records/v1/extension-installations/extension_<32位小写十六进制>.json`。data 恰好包含 package_kind、package_id、source、version、sha256；package_kind 限 skill/plugin/theme。该记录只表达期望安装项，不包含 enabled、trusted、permissions、granted_permissions、device_grants、package_path 或本机托管目录。目标设备必须从 source 重新获取、验证 sha256、执行本机安装审查并重新授权，逻辑记录本身不能启用扩展。
+
+以上四类与人设、布局均默认关闭。Rust 在 journal 前、远端应用前和上传提交前重复验证信封、路径、schema 与 data；未知字段、非法 ID、超限内容和 schema≠1 均拒绝。正文属于用户主动选择同步的内容，字段白名单不按关键字删除正文；秘密仍不得进入专用配置字段、附件外普通文件或任意数据库副本。
+
+## 可选记录范围（Workspace schema 13）
+
+人设、布局、对话、已结束 Agent 历史、一般 Provider 参数和安装清单默认仅保存在本机。用户在同步设置中逐类选择后才参与传输；选择保存在本机 Vault 数据库，不随逻辑记录上传。已有活动绑定时不得直接改变范围，必须解除绑定、调整选择、重新预览合并；预览摘要包含范围，旧范围的预览不能用于绑定新范围。
 
 本地扫描、外部删除发现、首次对账和 outbox 捕获均排除未选择的类别。旧版本残留的可选上传作业会被归档，提交前再次核验范围。关闭选项不删除本地文件或远端历史，也不产生远端 delete。接收未选择的类别时只保存 revision 元数据并推进已处理游标，既不获取对象正文，也不应用记录或制造冲突。已有未完成的排除类别冲突决定保留，但不继续应用；需重新对账处理。
 
-重新开启经新绑定获取固定远端快照，因此能够获取先前已跳过游标的记录，匹配的现有文件沿用初始对账身份与 CAS 规则。普通 Markdown、允许附件、任务及默认设置类别保持原范围；手动导出的 attachments/*.txt 是普通附件，不是自动生效的人设。此版只定义已实现的人设和布局选择，不把尚无适配器的对话、Agent 历史或 Provider 参数视为已支持。
+重新开启经新绑定获取固定远端快照，因此能够获取先前已跳过游标的记录，匹配的现有文件沿用初始对账身份与 CAS 规则。普通 Markdown、允许附件、任务、用户 Skill、主题和编辑器偏好保持默认同步；手动导出的 attachments/*.txt 是普通附件，不是自动生效的人设。Workspace 从 schema 12 升级前创建完整可读 SQLite 备份，保留旧 persona/layout 选择，新类别全部初始化为关闭；schema 13 以上由旧客户端以 `SCHEMA_INCOMPATIBLE` 拒绝打开，不能降级写入。
diff --git a/docs/development/OpenNexus生产验收Runner.md b/docs/development/OpenNexus生产验收Runner.md
index 2b4adf9..a2f3d59 100644
--- a/docs/development/OpenNexus生产验收Runner.md
+++ b/docs/development/OpenNexus生产验收Runner.md
@@ -24,4 +24,4 @@ python scripts/phase3-production-acceptance.py `
 
 报告目录包含 `summary.json`、`case-manifest.json`、`junit.xml`、`cases/<ID>.json` 和脱敏的 `logs/<ID>.log`。摘要记录 commit、各锁文件 SHA-256、配置摘要与已提供安装产物摘要。日志将仓库、数据根、报告根、用户主目录和配置声明的秘密值替换为占位符，并限制为 10 MiB。报告目录必须为空，避免单例复跑覆盖原始证据。
 
-当前 runner 与失败闭合行为已实现，A-02/A-03 Sidecar、B-01/B-02 凭据、D-01 扩展包以及 S-01/S-02/S-03 Sync 客户端 driver 已登记；其余 22 个生产验收 ID 尚未登记，运行时会生成 `NOT_IMPLEMENTED` 证据并退出 1。这用于阻止误报，不是这些用例的验收通过。
+当前 runner 与失败闭合行为已实现，A-02/A-03 Sidecar、B-01/B-02 凭据、D-01 扩展包以及 S-01/S-02/S-03/S-08 Sync 客户端 driver 已登记；其余 21 个生产验收 ID 尚未登记，运行时会生成 `NOT_IMPLEMENTED` 证据并退出 1。这用于阻止误报，不是这些用例的验收通过。
diff --git a/frontend/src-tauri/src/preference_records.rs b/frontend/src-tauri/src/preference_records.rs
index 7627a1b..7ea1611 100644
--- a/frontend/src-tauri/src/preference_records.rs
+++ b/frontend/src-tauri/src/preference_records.rs
@@ -101,6 +101,60 @@ struct Preferences {
     markdown: Markdown,
     presets: Vec<Preset>,
 }
+#[derive(Deserialize)]
+#[serde(deny_unknown_fields)]
+struct ConversationMessage {
+    message_id: String,
+    parent_message_id: Option<String>,
+    role: String,
+    content: String,
+    thinking: Option<String>,
+    attachments: Vec<String>,
+    created_at_ms: i64,
+}
+#[derive(Deserialize)]
+#[serde(deny_unknown_fields)]
+struct Conversation {
+    title: String,
+    active_leaf: Option<String>,
+    created_at_ms: i64,
+    updated_at_ms: i64,
+    messages: Vec<ConversationMessage>,
+}
+#[derive(Deserialize)]
+#[serde(deny_unknown_fields)]
+struct AgentHistory {
+    status: String,
+    input: String,
+    output: Option<String>,
+    model: String,
+    skill_id: Option<String>,
+    error_code: Option<String>,
+    error_message: Option<String>,
+    token_usage: u64,
+    created_at_ms: i64,
+    updated_at_ms: i64,
+}
+#[derive(Deserialize)]
+#[serde(deny_unknown_fields)]
+struct ProviderSettings {
+    version: u64,
+    provider_type: String,
+    name: String,
+    base_url: Option<String>,
+    default_model: Option<String>,
+    enabled: bool,
+    capabilities: Vec<String>,
+}
+#[derive(Deserialize)]
+#[serde(deny_unknown_fields)]
+struct ExtensionInstallation {
+    package_kind: String,
+    package_id: String,
+    source: String,
+    version: String,
+    sha256: String,
+}
 fn decode<T: serde::de::DeserializeOwned>(value: &Value) -> Result<T> {
     serde_json::from_value(value.clone()).map_err(|_| HostError::new("RECORD_SCHEMA_INVALID"))
 }
@@ -138,6 +192,44 @@ fn unique_bounded(values: &[String], max_items: usize, max_chars: usize) -> bool
             .enumerate()
             .all(|(index, value)| !values[..index].contains(value))
 }
+fn bounded_identifier(value: &str, max_chars: usize) -> bool {
+    !value.is_empty()
+        && value.chars().count() <= max_chars
+        && value
+            .bytes()
+            .all(|b| b.is_ascii_alphanumeric() || b"._:-".contains(&b))
+}
+fn portable_reference(value: &str, max_chars: usize) -> bool {
+    !value.is_empty()
+        && value.chars().count() <= max_chars
+        && !value.starts_with('/')
+        && !value.contains(['\\', '\0'])
+        && value
+            .split('/')
+            .all(|part| !part.is_empty() && part != "." && part != "..")
+}
+fn model_identifier(value: &str) -> bool {
+    !value.is_empty()
+        && value.chars().count() <= 256
+        && value
+            .bytes()
+            .all(|byte| byte.is_ascii_alphanumeric() || b"._:/+-".contains(&byte))
+}
+fn timestamp(value: i64) -> bool {
+    (0..=253402300799999).contains(&value)
+}
+fn safe_base_url(value: &str) -> bool {
+    let Some(rest) = value
+        .strip_prefix("https://")
+        .or_else(|| value.strip_prefix("http://"))
+    else {
+        return false;
+    };
+    !rest.is_empty()
+        && !rest.bytes().any(|byte| byte.is_ascii_control())
+        && !rest.contains(['@', '?', '#', '\\'])
+        && rest.split('/').next().is_some_and(|host| !host.is_empty())
+}
 pub fn validate(kind: &str, value: &Value) -> Result<()> {
     let valid = match kind {
         "persona" => {
@@ -252,6 +344,138 @@ pub fn validate(kind: &str, value: &Value) -> Result<()> {
                         && markdown(&p.preferences)
                 })
         }
+        "conversation" => {
+            let value: Conversation = decode(value)?;
+            let message_id = |id: &str| bounded_identifier(id, 128);
+            !value.title.trim().is_empty()
+                && value.title.chars().count() <= 120
+                && timestamp(value.created_at_ms)
+                && timestamp(value.updated_at_ms)
+                && value.updated_at_ms >= value.created_at_ms
+                && value.messages.len() <= 2_000
+                && value.active_leaf.as_deref().is_none_or(|id| {
+                    message_id(id) && value.messages.iter().any(|v| v.message_id == id)
+                })
+                && value.messages.iter().enumerate().all(|(index, message)| {
+                    message_id(&message.message_id)
+                        && !value.messages[..index]
+                            .iter()
+                            .any(|previous| previous.message_id == message.message_id)
+                        && message.parent_message_id.as_deref().is_none_or(|id| {
+                            message_id(id)
+                                && id != message.message_id
+                                && value
+                                    .messages
+                                    .iter()
+                                    .any(|candidate| candidate.message_id == id)
+                        })
+                        && matches!(message.role.as_str(), "user" | "assistant" | "system")
+                        && message.content.chars().count() <= 262_144
+                        && message
+                            .thinking
+                            .as_ref()
+                            .is_none_or(|text| text.chars().count() <= 262_144)
+                        && message.attachments.len() <= 64
+                        && message
+                            .attachments
+                            .iter()
+                            .all(|path| portable_reference(path, 512))
+                        && message
+                            .attachments
+                            .iter()
+                            .enumerate()
+                            .all(|(index, path)| !message.attachments[..index].contains(path))
+                        && timestamp(message.created_at_ms)
+                })
+        }
+        "agent_history" => {
+            let value: AgentHistory = decode(value)?;
+            matches!(value.status.as_str(), "completed" | "failed" | "cancelled")
+                && value.input.chars().count() <= 262_144
+                && value
+                    .output
+                    .as_ref()
+                    .is_none_or(|text| text.chars().count() <= 524_288)
+                && model_identifier(&value.model)
+                && value
+                    .skill_id
+                    .as_deref()
+                    .is_none_or(|id| bounded_identifier(id, 128))
+                && value
+                    .error_code
+                    .as_deref()
+                    .is_none_or(|code| bounded_identifier(code, 128))
+                && value
+                    .error_message
+                    .as_ref()
+                    .is_none_or(|message| message.chars().count() <= 4_096)
+                && value.token_usage <= 9_007_199_254_740_991
+                && timestamp(value.created_at_ms)
+                && timestamp(value.updated_at_ms)
+                && value.updated_at_ms >= value.created_at_ms
+        }
+        "provider_settings" => {
+            let value: ProviderSettings = decode(value)?;
+            let _ = value.enabled;
+            let known_capabilities = [
+                "chat",
+                "vision",
+                "tool_calling",
+                "reasoning",
+                "streaming",
+                "structured_output",
+                "embedding",
+                "transcription",
+                "speaker_matching",
+            ];
+            value.version <= 9_007_199_254_740_991
+                && matches!(
+                    value.provider_type.as_str(),
+                    "mock"
+                        | "openai_responses"
+                        | "openai_chat"
+                        | "openai_compatible"
+                        | "anthropic_messages"
+                        | "ollama"
+                )
+                && !value.name.trim().is_empty()
+                && value.name.chars().count() <= 128
+                && value
+                    .base_url
+                    .as_deref()
+                    .is_none_or(|url| url.len() <= 2_048 && safe_base_url(url))
+                && value.default_model.as_deref().is_none_or(model_identifier)
+                && unique_bounded(&value.capabilities, 16, 64)
+                && value
+                    .capabilities
+                    .iter()
+                    .all(|capability| known_capabilities.contains(&capability.as_str()))
+        }
+        "extension_installation" => {
+            let value: ExtensionInstallation = decode(value)?;
+            matches!(value.package_kind.as_str(), "skill" | "plugin" | "theme")
+                && bounded_identifier(&value.package_id, 128)
+                && !value.source.is_empty()
+                && value.source.len() <= 512
+                && value
+                    .source
+                    .bytes()
+                    .all(|byte| byte.is_ascii_alphanumeric() || b"._:/-".contains(&byte))
+                && !value.source.contains("..")
+                && !value.source.contains('@')
+                && !value.source.contains(['?', '#', '\\'])
+                && !value.version.is_empty()
+                && value.version.len() <= 128
+                && value
+                    .version
+                    .bytes()
+                    .all(|byte| byte.is_ascii_alphanumeric() || b".+-_".contains(&byte))
+                && value.sha256.len() == 64
+                && value
+                    .sha256
+                    .bytes()
+                    .all(|byte| byte.is_ascii_digit() || (b'a'..=b'f').contains(&byte))
+        }
         _ => return Err(HostError::new("RECORD_SCHEMA_UNSUPPORTED")),
     };
     if valid {
@@ -347,4 +571,71 @@ mod tests {
             "RECORD_DATA_INVALID"
         );
     }
+
+    #[test]
+    fn s08_optional_schemas_are_strict_and_installations_cannot_authorize() {
+        let fixtures = [
+            (
+                "conversation",
+                "conversation_00000000000000000000000000000001",
+                json!({"title":"Review","active_leaf":"message_1","created_at_ms":1,"updated_at_ms":2,"messages":[{"message_id":"message_1","parent_message_id":null,"role":"user","content":"Hello","thinking":null,"attachments":[],"created_at_ms":1}]}),
+            ),
+            (
+                "agent_history",
+                "agent_run_00000000000000000000000000000001",
+                json!({"status":"completed","input":"Review","output":"Done","model":"gpt-5.6","skill_id":null,"error_code":null,"error_message":null,"token_usage":42,"created_at_ms":1,"updated_at_ms":2}),
+            ),
+            (
+                "provider_settings",
+                "provider_00000000000000000000000000000001",
+                json!({"version":1,"provider_type":"openai_responses","name":"OpenAI","base_url":"https://api.openai.com/v1","default_model":"gpt-5.6","enabled":true,"capabilities":["chat","tool_calling"]}),
+            ),
+            (
+                "extension_installation",
+                "extension_00000000000000000000000000000001",
+                json!({"package_kind":"plugin","package_id":"opennexus.review","source":"community/opennexus.review","version":"1.2.3","sha256":"a".repeat(64)}),
+            ),
+        ];
+        for (kind, id, data) in fixtures {
+            let path = crate::records::path_for(kind, id).unwrap();
+            let record = json!({"schema":1,"kind":kind,"id":id,"data":data});
+            crate::records::validate(&path, &serde_json::to_vec(&record).unwrap()).unwrap();
+            assert!(crate::records::allowed(&path));
+            assert!(!crate::sync_scope::OptionalScope::default().includes(&path));
+            let mut unknown = record.clone();
+            unknown["data"]["api_key"] = json!("must-never-sync");
+            assert_eq!(
+                crate::records::validate(&path, &serde_json::to_vec(&unknown).unwrap())
+                    .err()
+                    .unwrap()
+                    .code,
+                "RECORD_SCHEMA_INVALID"
+            );
+        }
+
+        let installation = json!({"package_kind":"plugin","package_id":"opennexus.review","source":"community/opennexus.review","version":"1.2.3","sha256":"a".repeat(64)});
+        for forbidden in [
+            "permissions",
+            "granted_permissions",
+            "enabled",
+            "trusted",
+            "device_grants",
+            "package_path",
+        ] {
+            let mut invalid = installation.clone();
+            invalid[forbidden] = json!(true);
+            assert_eq!(
+                validate("extension_installation", &invalid)
+                    .unwrap_err()
+                    .code,
+                "RECORD_SCHEMA_INVALID"
+            );
+        }
+        let mut provider = json!({"version":1,"provider_type":"openai_responses","name":"OpenAI","base_url":"https://api.openai.com/v1","default_model":"gpt-5.6","enabled":true,"capabilities":["chat"]});
+        provider["credential_id"] = json!("device-secret-reference");
+        assert_eq!(
+            validate("provider_settings", &provider).unwrap_err().code,
+            "RECORD_SCHEMA_INVALID"
+        );
+    }
 }
diff --git a/frontend/src-tauri/src/records.rs b/frontend/src-tauri/src/records.rs
index e1f4e64..5c1426a 100644
--- a/frontend/src-tauri/src/records.rs
+++ b/frontend/src-tauri/src/records.rs
@@ -45,6 +45,17 @@ pub fn user_skill_path(id: &str) -> Result<String> {
     }
     Ok(format!("opennexus-records/v1/user-skills/{id}.json"))
 }
+fn portable_id_path(id: &str, prefix: &str, directory: &str) -> Result<String> {
+    if !id.starts_with(prefix)
+        || id.len() != prefix.len() + 32
+        || !id[prefix.len()..]
+            .bytes()
+            .all(|v| v.is_ascii_digit() || (b'a'..=b'f').contains(&v))
+    {
+        return Err(HostError::new("RECORD_ID_INVALID"));
+    }
+    Ok(format!("opennexus-records/v1/{directory}/{id}.json"))
+}
 pub fn path_for(kind: &str, id: &str) -> Result<String> {
     match (kind, id) {
         ("task", id) => path(id),
@@ -55,6 +66,12 @@ pub fn path_for(kind: &str, id: &str) -> Result<String> {
         ("layout", "sidebars") => Ok("opennexus-records/v1/layout/sidebars.json".into()),
         ("preferences", "editor") => Ok("opennexus-records/v1/preferences/editor.json".into()),
         ("user_skill", id) => user_skill_path(id),
+        ("conversation", id) => portable_id_path(id, "conversation_", "conversations"),
+        ("agent_history", id) => portable_id_path(id, "agent_run_", "agent-history"),
+        ("provider_settings", id) => portable_id_path(id, "provider_", "provider-settings"),
+        ("extension_installation", id) => {
+            portable_id_path(id, "extension_", "extension-installations")
+        }
         _ => Err(HostError::new("RECORD_ID_INVALID")),
     }
 }
@@ -78,10 +95,32 @@ pub fn allowed(path_value: &str) -> bool {
     {
         return true;
     }
-    path_value
+    if path_value
         .strip_prefix("opennexus-records/v1/user-skills/")
         .and_then(|v| v.strip_suffix(".json"))
         .is_some_and(|id| user_skill_path(id).is_ok())
+    {
+        return true;
+    }
+    [
+        ("conversation", "opennexus-records/v1/conversations/"),
+        ("agent_history", "opennexus-records/v1/agent-history/"),
+        (
+            "provider_settings",
+            "opennexus-records/v1/provider-settings/",
+        ),
+        (
+            "extension_installation",
+            "opennexus-records/v1/extension-installations/",
+        ),
+    ]
+    .iter()
+    .any(|(kind, prefix)| {
+        path_value
+            .strip_prefix(prefix)
+            .and_then(|value| value.strip_suffix(".json"))
+            .is_some_and(|id| path_for(kind, id).is_ok())
+    })
 }
 pub fn validate(path_value: &str, content: &[u8]) -> Result<Record> {
     if content.len() > 1024 * 1024 {
@@ -184,6 +223,10 @@ impl Workspace {
         let prefix = match kind {
             "task" => "opennexus-records/v1/tasks/",
             "user_skill" => "opennexus-records/v1/user-skills/",
+            "conversation" => "opennexus-records/v1/conversations/",
+            "agent_history" => "opennexus-records/v1/agent-history/",
+            "provider_settings" => "opennexus-records/v1/provider-settings/",
+            "extension_installation" => "opennexus-records/v1/extension-installations/",
             _ => return Err(HostError::new("RECORD_SCHEMA_UNSUPPORTED")),
         };
         let paths = self
@@ -295,4 +338,38 @@ mod tests {
             value
         );
     }
+
+    #[test]
+    fn s08_incompatible_remote_schema_preserves_local_file_and_upload_queue() {
+        let root = tempfile::tempdir().unwrap();
+        let mut ws = Workspace::open(root.path()).unwrap();
+        let current = fixture();
+        let path = path(current["id"].as_str().unwrap()).unwrap();
+        let entry = ws
+            .write(&path, "", &serde_json::to_vec(&current).unwrap(), "local")
+            .unwrap();
+        assert_eq!(ws.pending_count().unwrap(), 1);
+
+        let mut future = current.clone();
+        future["schema"] = json!(2);
+        future["data"]["title"] = json!("future remote value");
+        assert_eq!(
+            ws.write(
+                &path,
+                &entry.hash,
+                &serde_json::to_vec(&future).unwrap(),
+                "remote",
+            )
+            .unwrap_err()
+            .code,
+            "RECORD_SCHEMA_UNSUPPORTED"
+        );
+        assert_eq!(ws.pending_count().unwrap(), 1);
+        assert_eq!(
+            ws.record_get(current["id"].as_str().unwrap())
+                .unwrap()
+                .unwrap()["record"],
+            current
+        );
+    }
 }
diff --git a/frontend/src-tauri/src/sync_discovery.rs b/frontend/src-tauri/src/sync_discovery.rs
index eadfee2..67226da 100644
--- a/frontend/src-tauri/src/sync_discovery.rs
+++ b/frontend/src-tauri/src/sync_discovery.rs
@@ -206,6 +206,11 @@ mod tests {
             "attachments/tool.exe",
             "attachments/plugin.zip",
             "settings.json",
+            "index.sqlite3",
+            "vectors.bin",
+            "cache/index.md",
+            "logs/agent.md",
+            "models/embedding.md",
         ] {
             assert!(!allowed(path), "{path}");
         }
@@ -214,6 +219,8 @@ mod tests {
             "attachments/movie.mp4",
             "attachments/image.png",
             "attachments/fixture.bin",
+            "opennexus-records/v1/conversations/conversation_00000000000000000000000000000001.json",
+            "opennexus-records/v1/extension-installations/extension_00000000000000000000000000000001.json",
         ] {
             assert!(allowed(path), "{path}");
         }
diff --git a/frontend/src-tauri/src/sync_resolution.rs b/frontend/src-tauri/src/sync_resolution.rs
index e172856..c39d591 100644
--- a/frontend/src-tauri/src/sync_resolution.rs
+++ b/frontend/src-tauri/src/sync_resolution.rs
@@ -419,6 +419,7 @@ mod tests {
         ws.sync_set_optional_scope(crate::sync_scope::OptionalScope {
             persona: true,
             layout: true,
+            ..Default::default()
         })
         .unwrap();
         let binding = ws
diff --git a/frontend/src-tauri/src/sync_scope.rs b/frontend/src-tauri/src/sync_scope.rs
index fa12145..78214f9 100644
--- a/frontend/src-tauri/src/sync_scope.rs
+++ b/frontend/src-tauri/src/sync_scope.rs
@@ -8,6 +8,10 @@ use serde::{Deserialize, Serialize};
 pub struct OptionalScope {
     pub persona: bool,
     pub layout: bool,
+    pub conversations: bool,
+    pub agent_history: bool,
+    pub provider_settings: bool,
+    pub extension_installations: bool,
 }
 
 impl OptionalScope {
@@ -15,6 +19,14 @@ impl OptionalScope {
         match path {
             "opennexus-records/v1/persona/default.json" => self.persona,
             "opennexus-records/v1/layout/sidebars.json" => self.layout,
+            path if path.starts_with("opennexus-records/v1/conversations/") => self.conversations,
+            path if path.starts_with("opennexus-records/v1/agent-history/") => self.agent_history,
+            path if path.starts_with("opennexus-records/v1/provider-settings/") => {
+                self.provider_settings
+            }
+            path if path.starts_with("opennexus-records/v1/extension-installations/") => {
+                self.extension_installations
+            }
             _ => true,
         }
     }
@@ -29,12 +41,16 @@ impl Workspace {
         Ok(self
             .db
             .query_row(
-                "SELECT persona,layout FROM sync_optional_scope WHERE id=1",
+                "SELECT persona,layout,conversations,agent_history,provider_settings,extension_installations FROM sync_optional_scope WHERE id=1",
                 [],
                 |row| {
                     Ok(OptionalScope {
                         persona: row.get(0)?,
                         layout: row.get(1)?,
+                        conversations: row.get(2)?,
+                        agent_history: row.get(3)?,
+                        provider_settings: row.get(4)?,
+                        extension_installations: row.get(5)?,
                     })
                 },
             )
@@ -47,8 +63,8 @@ impl Workspace {
             return Err(HostError::new("SYNC_SCOPE_REBIND_REQUIRED"));
         }
         self.db.execute(
-            "INSERT INTO sync_optional_scope VALUES (1,?1,?2) ON CONFLICT(id) DO UPDATE SET persona=excluded.persona,layout=excluded.layout",
-            rusqlite::params![scope.persona, scope.layout],
+            "INSERT INTO sync_optional_scope (id,persona,layout,conversations,agent_history,provider_settings,extension_installations) VALUES (1,?1,?2,?3,?4,?5,?6) ON CONFLICT(id) DO UPDATE SET persona=excluded.persona,layout=excluded.layout,conversations=excluded.conversations,agent_history=excluded.agent_history,provider_settings=excluded.provider_settings,extension_installations=excluded.extension_installations",
+            rusqlite::params![scope.persona, scope.layout, scope.conversations, scope.agent_history, scope.provider_settings, scope.extension_installations],
         )?;
         Ok(())
     }
@@ -65,6 +81,7 @@ mod tests {
         ws.sync_set_optional_scope(OptionalScope {
             persona: true,
             layout: false,
+            ..OptionalScope::default()
         })
         .unwrap();
         let data = serde_json::to_vec(&serde_json::json!({"schema":1,"kind":"persona","id":"default","data":{"version":0,"name":"local","system_prompt":"private","dialogue_pairs":[]}})).unwrap();
@@ -135,6 +152,7 @@ mod tests {
         ws.sync_set_optional_scope(OptionalScope {
             persona: true,
             layout: false,
+            ..OptionalScope::default()
         })
         .unwrap();
         assert_eq!(
@@ -176,7 +194,7 @@ mod tests {
             ws.db
                 .query_row("PRAGMA user_version", [], |r| r.get::<_, i64>(0))
                 .unwrap(),
-            12
+            13
         );
     }
     #[test]
@@ -187,10 +205,24 @@ mod tests {
         let off = ws.sync_optional_scope().unwrap();
         assert!(!off.includes("opennexus-records/v1/persona/default.json"));
         assert!(!off.includes("opennexus-records/v1/layout/sidebars.json"));
+        assert!(!off.includes(
+            "opennexus-records/v1/conversations/conversation_00000000000000000000000000000001.json"
+        ));
+        assert!(!off.includes(
+            "opennexus-records/v1/agent-history/agent_run_00000000000000000000000000000001.json"
+        ));
+        assert!(!off.includes(
+            "opennexus-records/v1/provider-settings/provider_00000000000000000000000000000001.json"
+        ));
+        assert!(!off.includes("opennexus-records/v1/extension-installations/extension_00000000000000000000000000000001.json"));
         assert!(off.includes("notes/example.md"));
         let chosen = OptionalScope {
             persona: true,
             layout: false,
+            conversations: true,
+            agent_history: true,
+            provider_settings: true,
+            extension_installations: true,
         };
         ws.sync_set_optional_scope(chosen).unwrap();
         assert_eq!(ws.pending_count().unwrap(), 0);
@@ -220,7 +252,7 @@ mod tests {
     #[test]
     fn scope_rejects_unknown_fields_instead_of_authorizing_future_categories() {
         assert!(serde_json::from_str::<OptionalScope>(
-            r#"{"persona":true,"layout":false,"credentials":true}"#
+            r#"{"persona":true,"layout":false,"conversations":false,"agent_history":false,"provider_settings":false,"extension_installations":false,"credentials":true}"#
         )
         .is_err());
     }
diff --git a/frontend/src-tauri/src/workspace.rs b/frontend/src-tauri/src/workspace.rs
index dfbd0ca..a188800 100644
--- a/frontend/src-tauri/src/workspace.rs
+++ b/frontend/src-tauri/src/workspace.rs
@@ -136,10 +136,10 @@ impl Workspace {
         let db = Connection::open(db_path)?;
         db.execute_batch("PRAGMA journal_mode=WAL; PRAGMA synchronous=FULL;")?;
         let version: i64 = db.query_row("PRAGMA user_version", [], |r| r.get(0))?;
-        if version > 12 {
+        if version > 13 {
             return Err(HostError::new("SCHEMA_INCOMPATIBLE"));
         }
-        if (1..12).contains(&version) {
+        if (1..13).contains(&version) {
             // Independent, complete SQLite backup before the schema ownership change.
             let backup = managed.join(format!("host-schema{version}-{}.sqlite3", Uuid::new_v4()));
             db.execute("VACUUM INTO ?1", [backup.to_string_lossy().as_ref()])?;
@@ -166,7 +166,7 @@ impl Workspace {
             CREATE TABLE IF NOT EXISTS sync_attempts (binding TEXT NOT NULL,operation_id TEXT NOT NULL,attempts INTEGER NOT NULL,outcome TEXT NOT NULL,error TEXT,PRIMARY KEY(binding,operation_id));
             CREATE TABLE IF NOT EXISTS sync_retry (binding TEXT PRIMARY KEY,error TEXT,failures INTEGER NOT NULL,retry_at INTEGER,halted INTEGER NOT NULL);
             CREATE TABLE IF NOT EXISTS sync_preferences (binding TEXT PRIMARY KEY,paused INTEGER NOT NULL DEFAULT 0);
-            CREATE TABLE IF NOT EXISTS sync_optional_scope (id INTEGER PRIMARY KEY CHECK(id=1),persona INTEGER NOT NULL CHECK(persona IN (0,1)),layout INTEGER NOT NULL CHECK(layout IN (0,1)));
+            CREATE TABLE IF NOT EXISTS sync_optional_scope (id INTEGER PRIMARY KEY CHECK(id=1),persona INTEGER NOT NULL CHECK(persona IN (0,1)),layout INTEGER NOT NULL CHECK(layout IN (0,1)),conversations INTEGER NOT NULL DEFAULT 0 CHECK(conversations IN (0,1)),agent_history INTEGER NOT NULL DEFAULT 0 CHECK(agent_history IN (0,1)),provider_settings INTEGER NOT NULL DEFAULT 0 CHECK(provider_settings IN (0,1)),extension_installations INTEGER NOT NULL DEFAULT 0 CHECK(extension_installations IN (0,1)));
             CREATE TABLE IF NOT EXISTS sync_resolutions (binding TEXT NOT NULL,sequence INTEGER NOT NULL,choice TEXT NOT NULL,destination TEXT NOT NULL,expected TEXT NOT NULL,operation_id TEXT NOT NULL,rename_id TEXT NOT NULL,copy_id TEXT NOT NULL,state TEXT NOT NULL,retire_id TEXT NOT NULL,restore_id TEXT NOT NULL,PRIMARY KEY(binding,sequence));")?;
         let has_origin: bool = db.query_row(
             "SELECT EXISTS(SELECT 1 FROM pragma_table_info('file_ops') WHERE name='origin')",
@@ -201,10 +201,30 @@ impl Workspace {
                 [],
             )?;
         }
+        for column in [
+            "conversations",
+            "agent_history",
+            "provider_settings",
+            "extension_installations",
+        ] {
+            let exists: bool = db.query_row(
+                "SELECT EXISTS(SELECT 1 FROM pragma_table_info('sync_optional_scope') WHERE name=?1)",
+                [column],
+                |row| row.get(0),
+            )?;
+            if !exists {
+                db.execute(
+                    &format!(
+                        "ALTER TABLE sync_optional_scope ADD COLUMN {column} INTEGER NOT NULL DEFAULT 0 CHECK({column} IN (0,1))"
+                    ),
+                    [],
+                )?;
+            }
+        }
         if version < 7 {
             db.execute_batch("INSERT OR IGNORE INTO sync_observed SELECT f.id,COALESCE((SELECT o.path FROM outbox o WHERE o.file_id=f.id AND o.state IN ('pending','queued') ORDER BY rowid DESC LIMIT 1),(SELECT h.path FROM sync_heads h JOIN sync_bindings b ON h.binding=b.id WHERE h.file_id=f.id AND b.state='active'),f.path),COALESCE((SELECT o.hash FROM outbox o WHERE o.file_id=f.id AND o.state IN ('pending','queued') ORDER BY rowid DESC LIMIT 1),(SELECT h.hash FROM sync_heads h JOIN sync_bindings b ON h.binding=b.id WHERE h.file_id=f.id AND b.state='active'),f.hash),f.deleted FROM files f;")?;
         }
-        db.execute_batch("UPDATE sync_attempts SET outcome=CASE WHEN EXISTS(SELECT 1 FROM sync_jobs j WHERE j.binding=sync_attempts.binding AND j.operation_id=sync_attempts.operation_id AND j.state='acked') THEN 'succeeded' ELSE 'interrupted' END WHERE outcome='running'; PRAGMA user_version=12; COMMIT;")?;
+        db.execute_batch("UPDATE sync_attempts SET outcome=CASE WHEN EXISTS(SELECT 1 FROM sync_jobs j WHERE j.binding=sync_attempts.binding AND j.operation_id=sync_attempts.operation_id AND j.state='acked') THEN 'succeeded' ELSE 'interrupted' END WHERE outcome='running'; PRAGMA user_version=13; COMMIT;")?;
         let vault_id: String = db
             .query_row("SELECT id FROM identity", [], |r| r.get(0))
             .optional()?
@@ -1398,7 +1418,7 @@ mod tests {
     }
 
     #[test]
-    fn schema_eleven_upgrade_adds_durable_conflict_operation_ids() {
+    fn schema_eleven_upgrade_adds_durable_conflict_and_scope_fields() {
         let dir = tempfile::tempdir().unwrap();
         let ws = Workspace::open(dir.path()).unwrap();
         ws.db
@@ -1415,7 +1435,7 @@ mod tests {
             ws.db
                 .query_row("PRAGMA user_version", [], |row| row.get::<_, i64>(0))
                 .unwrap(),
-            12
+            13
         );
         for column in ["retire_id", "restore_id"] {
             assert!(ws
@@ -1447,6 +1467,54 @@ mod tests {
             .unwrap());
     }
 
+    #[test]
+    fn schema_twelve_upgrade_adds_optional_categories_without_consent() {
+        let dir = tempfile::tempdir().unwrap();
+        let ws = Workspace::open(dir.path()).unwrap();
+        ws.db
+            .execute_batch(
+                "DROP TABLE sync_optional_scope;
+                 CREATE TABLE sync_optional_scope (id INTEGER PRIMARY KEY CHECK(id=1),persona INTEGER NOT NULL CHECK(persona IN (0,1)),layout INTEGER NOT NULL CHECK(layout IN (0,1)));
+                 INSERT INTO sync_optional_scope VALUES (1,1,0);
+                 PRAGMA user_version=12;",
+            )
+            .unwrap();
+        drop(ws);
+
+        let ws = Workspace::open(dir.path()).unwrap();
+        let scope = ws.sync_optional_scope().unwrap();
+        assert!(scope.persona);
+        assert!(!scope.layout);
+        assert!(!scope.conversations);
+        assert!(!scope.agent_history);
+        assert!(!scope.provider_settings);
+        assert!(!scope.extension_installations);
+        assert_eq!(
+            ws.db
+                .query_row("PRAGMA user_version", [], |row| row.get::<_, i64>(0))
+                .unwrap(),
+            13
+        );
+        let backup = fs::read_dir(dir.path().join(".ainote"))
+            .unwrap()
+            .filter_map(|entry| entry.ok())
+            .find(|entry| {
+                entry
+                    .file_name()
+                    .to_string_lossy()
+                    .starts_with("host-schema12-")
+            })
+            .unwrap();
+        let old = Connection::open(backup.path()).unwrap();
+        assert!(!old
+            .query_row(
+                "SELECT EXISTS(SELECT 1 FROM pragma_table_info('sync_optional_scope') WHERE name='conversations')",
+                [],
+                |row| row.get::<_, bool>(0),
+            )
+            .unwrap());
+    }
+
     #[test]
     fn unsafe_paths_external_change_and_remote_origin() {
         let dir = tempfile::tempdir().unwrap();
diff --git a/frontend/src-tauri/tests/sync_classification.rs b/frontend/src-tauri/tests/sync_classification.rs
new file mode 100644
index 0000000..2aa70b3
--- /dev/null
+++ b/frontend/src-tauri/tests/sync_classification.rs
@@ -0,0 +1,401 @@
+#![cfg(feature = "desktop")]
+
+use notesagent_host::{
+    records, sync_client::SyncClient, sync_scope::OptionalScope, workspace::Workspace,
+};
+use serde_json::{json, Value};
+use std::{
+    io::{BufRead, BufReader},
+    path::Path,
+    process::{Child, Command, Stdio},
+    sync::{Arc, Mutex},
+};
+use zeroize::Zeroizing;
+
+struct Server(Child);
+
+impl Drop for Server {
+    fn drop(&mut self) {
+        self.0.stdin.take();
+        let _ = self.0.kill();
+        let _ = self.0.wait();
+    }
+}
+
+fn record(kind: &str, id: &str, data: Value) -> Value {
+    json!({"schema":1,"kind":kind,"id":id,"data":data})
+}
+
+fn records_fixture() -> Vec<(&'static str, &'static str, Value, bool)> {
+    let task = "task_00000000000000000000000000000001";
+    let skill = "user_skill_00000000000000000000000000000001";
+    let conversation = "conversation_00000000000000000000000000000001";
+    let run = "agent_run_00000000000000000000000000000001";
+    let provider = "provider_00000000000000000000000000000001";
+    let extension = "extension_00000000000000000000000000000001";
+    vec![
+        (
+            "task",
+            task,
+            record(
+                "task",
+                task,
+                json!({"title":"Ship","description":"Production checklist","status":"todo","note_id":null,"due_at_ms":null,"created_at_ms":1,"updated_at_ms":2}),
+            ),
+            false,
+        ),
+        (
+            "user_skill",
+            skill,
+            record(
+                "user_skill",
+                skill,
+                json!({"version":1,"name":"Review","description":"Review a note","prompt":"Check carefully","tools":["notes.read"],"permissions":["notes.read"],"retrieval":{"top_k":10,"rerank":true,"citation":true},"required_capabilities":["chat"],"created_at_ms":1,"updated_at_ms":2}),
+            ),
+            false,
+        ),
+        (
+            "theme_settings",
+            "appearance",
+            record(
+                "theme_settings",
+                "appearance",
+                json!({"themeId":"dark","fontEditorSize":18,"fontEditorFamily":"system-ui","lineHeight":1.7,"codeBlockTheme":"auto","headings":{"custom":false,"family":"inherit","levels":([32,28,24,21,18,16].map(|size|json!({"size":size,"weight":700})))}}),
+            ),
+            false,
+        ),
+        (
+            "preferences",
+            "editor",
+            record(
+                "preferences",
+                "editor",
+                json!({"restoreLastVault":true,"autoSaveInterval":1500,"language":"zh-CN","defaultEditorMode":"wysiwyg","editorLineWidth":80,"spellCheck":false,"markdown":{"heading":"atx","bullet":"-","incrementList":true,"fence":"`","math":true,"callouts":true,"diagrams":true,"autoLinks":true,"lineNumbers":true,"wrapCode":false,"indent":4,"defaultLanguage":""},"presets":[]}),
+            ),
+            false,
+        ),
+        (
+            "persona",
+            "default",
+            record(
+                "persona",
+                "default",
+                json!({"version":1,"name":"Writer","system_prompt":"Be concise","dialogue_pairs":[]}),
+            ),
+            true,
+        ),
+        (
+            "layout",
+            "sidebars",
+            record(
+                "layout",
+                "sidebars",
+                json!({"primaryExpanded":true,"workspaceWidth":400,"chatWidth":320}),
+            ),
+            true,
+        ),
+        (
+            "conversation",
+            conversation,
+            record(
+                "conversation",
+                conversation,
+                json!({"title":"Release review","active_leaf":"message_1","created_at_ms":1,"updated_at_ms":2,"messages":[{"message_id":"message_1","parent_message_id":null,"role":"user","content":"Review the release","thinking":null,"attachments":[],"created_at_ms":1}]}),
+            ),
+            true,
+        ),
+        (
+            "agent_history",
+            run,
+            record(
+                "agent_history",
+                run,
+                json!({"status":"completed","input":"Review release","output":"Ready","model":"gpt-5.6","skill_id":null,"error_code":null,"error_message":null,"token_usage":42,"created_at_ms":1,"updated_at_ms":2}),
+            ),
+            true,
+        ),
+        (
+            "provider_settings",
+            provider,
+            record(
+                "provider_settings",
+                provider,
+                json!({"version":1,"provider_type":"openai_responses","name":"OpenAI","base_url":"https://api.openai.com/v1","default_model":"gpt-5.6","enabled":true,"capabilities":["chat","tool_calling"]}),
+            ),
+            true,
+        ),
+        (
+            "extension_installation",
+            extension,
+            record(
+                "extension_installation",
+                extension,
+                json!({"package_kind":"plugin","package_id":"opennexus.review","source":"community/opennexus.review","version":"1.2.3","sha256":"a".repeat(64)}),
+            ),
+            true,
+        ),
+    ]
+}
+
+fn seed(workspace: &mut Workspace) -> Vec<(String, Value, bool)> {
+    workspace
+        .write("notes/default.md", "", b"# Default markdown", "local")
+        .unwrap();
+    workspace
+        .write(
+            "attachments/manual.pdf",
+            "",
+            b"portable attachment",
+            "local",
+        )
+        .unwrap();
+    let mut written = Vec::new();
+    for (kind, id, value, optional) in records_fixture() {
+        let path = records::path_for(kind, id).unwrap();
+        workspace
+            .write(&path, "", &serde_json::to_vec(&value).unwrap(), "local")
+            .unwrap();
+        written.push((path, value, optional));
+    }
+    for (path, contents) in [
+        ("logs/trace.md", "forbidden log"),
+        ("cache/search.md", "forbidden cache"),
+        ("models/local.md", "forbidden model"),
+        ("index.sqlite3", "forbidden index"),
+        ("vectors.bin", "forbidden vectors"),
+        ("provider-settings.json", "fixture-api-key"),
+    ] {
+        workspace
+            .write(path, "", contents.as_bytes(), "local")
+            .unwrap();
+    }
+    written
+}
+
+async fn push_all(
+    client: &SyncClient,
+    workspace: &Arc<Mutex<Workspace>>,
+    binding: &notesagent_host::sync_state::Binding,
+) {
+    while client.push_one(workspace, binding).await.unwrap() {}
+}
+
+async fn pull_all(
+    client: &SyncClient,
+    workspace: &Arc<Mutex<Workspace>>,
+    binding: &notesagent_host::sync_state::Binding,
+) {
+    while client.pull_page(workspace, binding).await.unwrap() > 0 {}
+}
+
+async fn create_remote(client: &SyncClient, name: &str) -> String {
+    client
+        .json(
+            reqwest::Method::POST,
+            "sync/v1/vaults",
+            Some(json!({"name":name})),
+        )
+        .await
+        .unwrap()["vault_id"]
+        .as_str()
+        .unwrap()
+        .to_owned()
+}
+
+#[tokio::test]
+async fn s08_actual_service_enforces_classification_and_roundtrips_selected_records() {
+    let service_root = tempfile::tempdir().unwrap();
+    std::fs::write(service_root.path().join(".opennexus-test"), b"fixture").unwrap();
+    let service = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .join("../../server sync")
+        .canonicalize()
+        .unwrap();
+    let python = service.join(if cfg!(windows) {
+        ".venv/Scripts/python.exe"
+    } else {
+        ".venv/bin/python"
+    });
+    let mut server = Server(
+        Command::new(python)
+            .args(["-m", "tests.host_fixture"])
+            .arg(service_root.path())
+            .current_dir(service)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::null())
+            .spawn()
+            .unwrap(),
+    );
+    let mut line = String::new();
+    BufReader::new(server.0.stdout.take().unwrap())
+        .read_line(&mut line)
+        .unwrap();
+    let ready: Value = serde_json::from_str(&line).unwrap();
+    let endpoint = format!("http://127.0.0.1:{}", ready["port"]);
+    let public = SyncClient::new(&endpoint, Zeroizing::new(String::new()), true).unwrap();
+    public.handshake().await.unwrap();
+    let session = public
+        .login(
+            "rust-fixture",
+            Zeroizing::new("controlled-fixture-password".into()),
+            "S-08 classification",
+        )
+        .await
+        .unwrap();
+    let client = SyncClient::new(
+        &endpoint,
+        Zeroizing::new(session.access_token.clone()),
+        true,
+    )
+    .unwrap();
+
+    let default_remote = create_remote(&client, "S-08 default").await;
+    let source_root = tempfile::tempdir().unwrap();
+    let mut source = Workspace::open(source_root.path()).unwrap();
+    let written = seed(&mut source);
+    let source = Arc::new(Mutex::new(source));
+    let source_binding = source
+        .lock()
+        .unwrap()
+        .sync_bind_empty(&endpoint, &default_remote, "rust-fixture")
+        .unwrap();
+    push_all(&client, &source, &source_binding).await;
+    let default_snapshot = client.snapshot(&default_remote).await.unwrap();
+    let default_paths = default_snapshot
+        .items
+        .iter()
+        .map(|item| item.path.as_str())
+        .collect::<Vec<_>>();
+    assert_eq!(default_paths.len(), 6);
+    assert!(default_paths.contains(&"notes/default.md"));
+    assert!(default_paths.contains(&"attachments/manual.pdf"));
+    assert!(written
+        .iter()
+        .filter(|(_, _, optional)| !optional)
+        .all(|(path, _, _)| default_paths.contains(&path.as_str())));
+    assert!(written
+        .iter()
+        .filter(|(_, _, optional)| *optional)
+        .all(|(path, _, _)| !default_paths.contains(&path.as_str())));
+    assert!(default_paths.iter().all(|path| {
+        !path.starts_with("logs/")
+            && !path.starts_with("cache/")
+            && !path.starts_with("models/")
+            && !path.contains("index")
+            && !path.contains("vectors")
+            && !path.contains("provider-settings.json")
+    }));
+
+    let target_root = tempfile::tempdir().unwrap();
+    let target = Arc::new(Mutex::new(Workspace::open(target_root.path()).unwrap()));
+    let target_binding = target
+        .lock()
+        .unwrap()
+        .sync_bind_download(&endpoint, &default_remote, "rust-fixture")
+        .unwrap();
+    pull_all(&client, &target, &target_binding).await;
+    assert_eq!(
+        target
+            .lock()
+            .unwrap()
+            .read("notes/default.md")
+            .unwrap()
+            .content,
+        "# Default markdown"
+    );
+    assert_eq!(
+        target
+            .lock()
+            .unwrap()
+            .read("attachments/manual.pdf")
+            .unwrap()
+            .content,
+        "portable attachment"
+    );
+    for (path, value, optional) in &written {
+        if *optional {
+            assert!(!target_root.path().join(path).exists());
+        } else {
+            assert_eq!(
+                serde_json::from_slice::<Value>(
+                    &std::fs::read(target_root.path().join(path)).unwrap()
+                )
+                .unwrap(),
+                *value
+            );
+        }
+    }
+
+    let optional_remote = create_remote(&client, "S-08 optional").await;
+    let optional_source_root = tempfile::tempdir().unwrap();
+    let mut optional_source = Workspace::open(optional_source_root.path()).unwrap();
+    optional_source
+        .sync_set_optional_scope(OptionalScope {
+            persona: true,
+            layout: true,
+            conversations: true,
+            agent_history: true,
+            provider_settings: true,
+            extension_installations: true,
+        })
+        .unwrap();
+    let optional_written = seed(&mut optional_source);
+    let optional_source = Arc::new(Mutex::new(optional_source));
+    let optional_source_binding = optional_source
+        .lock()
+        .unwrap()
+        .sync_bind_empty(&endpoint, &optional_remote, "rust-fixture")
+        .unwrap();
+    push_all(&client, &optional_source, &optional_source_binding).await;
+    assert_eq!(
+        client.snapshot(&optional_remote).await.unwrap().items.len(),
+        12
+    );
+
+    let optional_target_root = tempfile::tempdir().unwrap();
+    let mut optional_target = Workspace::open(optional_target_root.path()).unwrap();
+    optional_target
+        .sync_set_optional_scope(OptionalScope {
+            persona: true,
+            layout: true,
+            conversations: true,
+            agent_history: true,
+            provider_settings: true,
+            extension_installations: true,
+        })
+        .unwrap();
+    let optional_target = Arc::new(Mutex::new(optional_target));
+    let optional_target_binding = optional_target
+        .lock()
+        .unwrap()
+        .sync_bind_download(&endpoint, &optional_remote, "rust-fixture")
+        .unwrap();
+    pull_all(&client, &optional_target, &optional_target_binding).await;
+    for (path, value, _) in &optional_written {
+        assert_eq!(
+            serde_json::from_slice::<Value>(
+                &std::fs::read(optional_target_root.path().join(path)).unwrap()
+            )
+            .unwrap(),
+            *value
+        );
+    }
+    let installation = &optional_written
+        .iter()
+        .find(|(_, value, _)| value["kind"] == "extension_installation")
+        .unwrap()
+        .1["data"];
+    let keys = installation
+        .as_object()
+        .unwrap()
+        .keys()
+        .cloned()
+        .collect::<Vec<_>>();
+    assert_eq!(keys.len(), 5);
+    assert!(keys.iter().all(|key| {
+        matches!(
+            key.as_str(),
+            "package_kind" | "package_id" | "source" | "version" | "sha256"
+        )
+    }));
+}
diff --git a/frontend/src-tauri/tests/sync_push.rs b/frontend/src-tauri/tests/sync_push.rs
index 53daece..f909c52 100644
--- a/frontend/src-tauri/tests/sync_push.rs
+++ b/frontend/src-tauri/tests/sync_push.rs
@@ -81,6 +81,7 @@ async fn s01_actual_service_preserves_offline_chains_and_response_loss_idempoten
         .sync_set_optional_scope(notesagent_host::sync_scope::OptionalScope {
             persona: true,
             layout: true,
+            ..Default::default()
         })
         .unwrap();
     let binding = {
@@ -211,6 +212,7 @@ async fn s01_actual_service_preserves_offline_chains_and_response_loss_idempoten
         .sync_set_optional_scope(notesagent_host::sync_scope::OptionalScope {
             persona: true,
             layout: true,
+            ..Default::default()
         })
         .unwrap();
     let binding_b = workspace_b
@@ -810,6 +812,7 @@ async fn s01_actual_service_preserves_offline_chains_and_response_loss_idempoten
             .sync_set_optional_scope(notesagent_host::sync_scope::OptionalScope {
                 persona: true,
                 layout: true,
+                ..Default::default()
             })
             .unwrap();
     }
diff --git a/frontend/src/features/settings/SyncSettings.spec.ts b/frontend/src/features/settings/SyncSettings.spec.ts
index dc620a0..db9bd6b 100644
--- a/frontend/src/features/settings/SyncSettings.spec.ts
+++ b/frontend/src/features/settings/SyncSettings.spec.ts
@@ -83,13 +83,14 @@ it('shows persisted per-job interruption counts without starting work from the v
 })
 
 
-it('keeps optional records off until an explicit unbound scope change', async () => {
-  vi.mocked(hostInvoke).mockResolvedValue({ ...empty(), optional_scope: { persona: false, layout: false } })
+it('keeps every optional record class off until an explicit unbound scope change', async () => {
+  const optionalScope = { persona: false, layout: false, conversations: false, agent_history: false, provider_settings: false, extension_installations: false }
+  vi.mocked(hostInvoke).mockResolvedValue({ ...empty(), optional_scope: optionalScope })
   const wrapper = mount(SyncSettings); await flushPromises()
   const options = wrapper.findAll('.sync-scope input[type=checkbox]')
-  expect(options).toHaveLength(2)
-  expect((options[0]!.element as HTMLInputElement).checked).toBe(false)
+  expect(options).toHaveLength(6)
+  expect(options.every(option => !(option.element as HTMLInputElement).checked)).toBe(true)
   await options[0]!.setValue(true); await flushPromises()
-  expect(hostInvoke).toHaveBeenCalledWith('sync_set_scope', { vaultId: empty().vault_id, scope: { persona: true, layout: false } })
+  expect(hostInvoke).toHaveBeenCalledWith('sync_set_scope', { vaultId: empty().vault_id, scope: { ...optionalScope, persona: true } })
   wrapper.unmount()
 })
diff --git a/frontend/src/features/settings/SyncSettings.vue b/frontend/src/features/settings/SyncSettings.vue
index fb3464f..71c6d12 100644
--- a/frontend/src/features/settings/SyncSettings.vue
+++ b/frontend/src/features/settings/SyncSettings.vue
@@ -8,7 +8,8 @@ import { t } from '@/i18n'
 const { actionDialog, resolveAction, askConfirm } = useActionDialog()
 interface Binding { id: string; endpoint: string; account: string; remote_vault: string; cursor: number }
 interface Conflict { sequence: number; local_path: string; local_hash: string; current_hash?: string; current_path?: string; remote: { path: string; operation: string } }
-interface Status { optional_scope?: { persona: boolean; layout: boolean }; vault_id: string; binding: Binding | null; paused: boolean; pending: number; conflicts: Conflict[]; credential_state: string; running: boolean; error: string | null; retry_in: number | null; failures: number; halted: boolean; attempts?: Array<{ operation_id: string; path: string; attempts: number; outcome: string; error: string | null }> }
+type OptionalScope = { persona: boolean; layout: boolean; conversations: boolean; agent_history: boolean; provider_settings: boolean; extension_installations: boolean }
+interface Status { optional_scope?: OptionalScope; vault_id: string; binding: Binding | null; paused: boolean; pending: number; conflicts: Conflict[]; credential_state: string; running: boolean; error: string | null; retry_in: number | null; failures: number; halted: boolean; attempts?: Array<{ operation_id: string; path: string; attempts: number; outcome: string; error: string | null }> }
 interface RemoteVault { id: string; name: string; sequence: number; used: number; quota: number }
 const status = ref<Status | null>(null)
 const endpoint = ref('https://'), account = ref(''), password = ref(''), device = ref('OpenNexus Desktop'), testHttp = ref(false)
@@ -42,11 +43,11 @@ async function act(action: () => Promise<void>) {
   catch (error) { message.value = error instanceof Error ? error.message : 'SYNC_FAILED' }
   finally { busy.value = false }
 }
-function setScope(kind: 'persona' | 'layout', event: Event) {
+function setScope(kind: keyof OptionalScope, event: Event) {
   const current = status.value
   if (!current || current.binding) return
   const input = event.target as HTMLInputElement
-  const scope = { persona: false, layout: false, ...current.optional_scope, [kind]: input.checked }
+  const scope: OptionalScope = { persona: false, layout: false, conversations: false, agent_history: false, provider_settings: false, extension_installations: false, ...current.optional_scope, [kind]: input.checked }
   input.checked = current.optional_scope?.[kind] ?? false
   preview.value = null
   return act(async () => { await hostInvoke('sync_set_scope', { vaultId: current.vault_id, scope }) })
@@ -131,6 +132,10 @@ onUnmounted(() => { mounted = false; clearInterval(timer); password.value = '' }
       <legend>{{ t('可选同步内容', 'Optional sync content') }}</legend>
       <label><input type="checkbox" :checked="status.optional_scope?.persona ?? false" @change="setScope('persona', $event)" />{{ t('工作区人设', 'Workspace persona') }}</label>
       <label><input type="checkbox" :checked="status.optional_scope?.layout ?? false" @change="setScope('layout', $event)" />{{ t('侧栏布局', 'Sidebar layout') }}</label>
+      <label><input type="checkbox" :checked="status.optional_scope?.conversations ?? false" @change="setScope('conversations', $event)" />{{ t('对话记录', 'Conversation history') }}</label>
+      <label><input type="checkbox" :checked="status.optional_scope?.agent_history ?? false" @change="setScope('agent_history', $event)" />{{ t('已结束的 Agent 历史', 'Completed agent history') }}</label>
+      <label><input type="checkbox" :checked="status.optional_scope?.provider_settings ?? false" @change="setScope('provider_settings', $event)" />{{ t('Provider 通用参数（不含凭据）', 'Provider parameters (credentials excluded)') }}</label>
+      <label><input type="checkbox" :checked="status.optional_scope?.extension_installations ?? false" @change="setScope('extension_installations', $event)" />{{ t('扩展安装清单（需重新下载和授权）', 'Extension list (download and authorize again)') }}</label>
       <p>{{ t('默认仅保存在本机。修改已绑定范围时，请先解除绑定，再重新预览合并；关闭选项不会删除远端内容。', 'Kept locally by default. Unbind before changing scope, then preview a new merge. Disabling an option does not delete remote content.') }}</p>
     </fieldset>
     <div v-if="status?.binding" class="sync-bound">
diff --git a/scripts/acceptance_cases/s08_sync_client.py b/scripts/acceptance_cases/s08_sync_client.py
new file mode 100644
index 0000000..8eaf02b
--- /dev/null
+++ b/scripts/acceptance_cases/s08_sync_client.py
@@ -0,0 +1,107 @@
+"""S-08 sync classification and logical-record compatibility acceptance driver."""
+
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+import os
+import shutil
+import subprocess
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+MANIFEST = ROOT / "frontend" / "src-tauri" / "Cargo.toml"
+SERVICE_TEST = "s08_actual_service_enforces_classification_and_roundtrips_selected_records"
+SCHEMA_TEST = "preference_records::tests::s08_optional_schemas_are_strict_and_installations_cannot_authorize"
+QUEUE_TEST = "records::tests::s08_incompatible_remote_schema_preserves_local_file_and_upload_queue"
+MIGRATION_TEST = "workspace::tests::schema_twelve_upgrade_adds_optional_categories_without_consent"
+
+
+def sha256(path: Path) -> str:
+    digest = hashlib.sha256()
+    with path.open("rb") as source:
+        for chunk in iter(lambda: source.read(1024 * 1024), b""):
+            digest.update(chunk)
+    return digest.hexdigest()
+
+
+def run_exact(command: list[str]) -> bool:
+    completed = subprocess.run(command, cwd=ROOT, capture_output=True, text=True, check=False)
+    print(completed.stdout, end="")
+    print(completed.stderr, end="")
+    return completed.returncode == 0 and "1 passed; 0 failed" in completed.stdout
+
+
+def result(case_id: str, status: str, reason: str, assertions: list[dict]) -> dict:
+    evidence = f"cargo exact tests {SERVICE_TEST}, {SCHEMA_TEST}, {QUEUE_TEST}, and {MIGRATION_TEST}"
+    for assertion in assertions:
+        assertion.update({"status": status, "evidence": evidence})
+    files = []
+    for relative in (
+        "frontend/src-tauri/src/records.rs",
+        "frontend/src-tauri/src/preference_records.rs",
+        "frontend/src-tauri/src/sync_discovery.rs",
+        "frontend/src-tauri/src/sync_scope.rs",
+        "frontend/src-tauri/src/workspace.rs",
+        "frontend/src-tauri/tests/sync_classification.rs",
+        "frontend/src/features/settings/SyncSettings.vue",
+        "server sync/tests/host_fixture.py",
+    ):
+        files.append({"path": relative, "sha256": sha256(ROOT / relative)})
+    return {
+        "schema": 1,
+        "case_id": case_id,
+        "status": status,
+        "reason": reason,
+        "assertions": assertions,
+        "metrics": {"peak_rss_bytes": None, "max_process_count": None, "denied_access_count": None},
+        "files": files,
+        "revisions": [
+            {"scope": "actual two-client HTTP classification roundtrip", "default_records": 6, "all_selected_records": 12},
+            {"scope": "logical schema", "version": 1, "workspace_schema": 13},
+        ],
+    }
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--config", required=True)
+    parser.add_argument("--output", required=True)
+    args = parser.parse_args()
+    case_id = os.environ.get("OPENNEXUS_ACCEPTANCE_CASE_ID", "")
+    output = Path(args.output)
+    output.parent.mkdir(parents=True, exist_ok=True)
+    assertions = [
+        {"name": "classification fixtures cover default, optional, forbidden, and unknown data"},
+        {"name": "the complete default set roundtrips through the actual Sync service"},
+        {"name": "unselected optional records produce zero remote revisions"},
+        {"name": "secrets, indexes, vectors, logs, models, and caches produce zero remote revisions"},
+        {"name": "selected optional records roundtrip through the actual Sync service"},
+        {"name": "target extension installation records contain no permission or trust state"},
+        {"name": "an incompatible record schema rejects the write and preserves the local upload queue"},
+        {"name": "schema 12 upgrades with a readable backup and no inferred consent"},
+    ]
+    cargo = shutil.which(os.environ.get("CARGO", "cargo"))
+    passed = case_id == "S-08" and cargo is not None
+    if passed:
+        commands = [
+            [cargo, "test", "--manifest-path", str(MANIFEST), "--locked", "--features", "desktop", "--test", "sync_classification", SERVICE_TEST, "--", "--exact", "--nocapture"],
+            [cargo, "test", "--manifest-path", str(MANIFEST), "--locked", "--lib", SCHEMA_TEST, "--", "--exact", "--nocapture"],
+            [cargo, "test", "--manifest-path", str(MANIFEST), "--locked", "--lib", QUEUE_TEST, "--", "--exact", "--nocapture"],
+            [cargo, "test", "--manifest-path", str(MANIFEST), "--locked", "--lib", MIGRATION_TEST, "--", "--exact", "--nocapture"],
+        ]
+        for command in commands:
+            passed = run_exact(command) and passed
+    payload = result(
+        case_id,
+        "PASSED" if passed else "FAILED",
+        "" if passed else "An exact S-08 classification, roundtrip, compatibility, or migration oracle failed.",
+        assertions,
+    )
+    output.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+    return 0 if passed else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/phase3_acceptance.py b/scripts/phase3_acceptance.py
index add4e9f..8c98bc0 100644
--- a/scripts/phase3_acceptance.py
+++ b/scripts/phase3_acceptance.py
@@ -72,6 +72,11 @@ CASE_DRIVERS: dict[str, dict[str, Any]] = {
         "timeout_seconds": 900,
         "required_metrics": (),
     },
+    "S-08": {
+        "driver": "scripts/acceptance_cases/s08_sync_client.py",
+        "timeout_seconds": 900,
+        "required_metrics": (),
+    },
 }
 ENV_NAME = re.compile(r"[A-Z][A-Z0-9_]{2,127}")
 RUN_ID = re.compile(r"[A-Za-z0-9][A-Za-z0-9._-]{2,63}")