feat(permission): add new-session default setting

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Yichen Jiang
2026-07-31 12:48:19 +08:00
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# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
# side as of the last confirmed-consistent state. Both languages carry equal authority;
# after editing either side, bring the other along and re-record with:
# pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-31-permission-default-for-new-sessions.md
2026-07-31-permission-default-for-new-sessions.md: 236e0eedd2b3a6ba64a837fa1838d63545f13fb1
2026-07-31-permission-default-for-new-sessions.zh.md: 8cdb5e6a0b6ca8a9a878351474728b325fb92528

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# Agent Note: Permission Settings default for new sessions
Status: implemented
English | [中文](2026-07-31-permission-default-for-new-sessions.zh.md)
## Problem
The Web General-settings page displayed Permission as a disabled skeleton even though `dsh-permission` already owned the preset table and current-session switch path. The Settings seam could persist a plugin-owned value, but the Web settings API exposed only configurable LLM-provider namespaces. More importantly, treating a user preference as a live global permission would make an existing session's execution policy change outside its durable log.
## Decision
`dsh-permission` owns a `permission` Settings namespace with one `defaultPreset` field. Its base value is `Config.defaultPreset`, or the preset matching the composed sandbox and approval defaults when the config omits it. The schema derives its enum from the configured preset table, so Settings validates stored values and the Web client discovers the deployment's actual choices without duplicating them.
The service reads the current Settings value synchronously at `session/created`. A genuinely fresh session receives three explicit events: `permission/preset`, `sandbox/mode`, and `approval/policy`. Those facts pin the permission selected at creation, so a later Settings change affects only later sessions. A seeded or partially initialized session preserves its effective knobs and receives only missing facts; it never adopts the latest user default while resuming.
The existing `/permission` command and `permissions` projection remain the current-session path. The browser plugin now contributes the Permission row to `settings.general.item`, reads the dynamic enum from the redacted Settings descriptor, and writes only `defaultPreset` through a revision-checked `settings.mutate`. The ownerless General-settings package retains only the Tool Call skeleton.
ApiProxy explicitly adds `permission` to its Web settings allowlist beside the configurable-provider namespaces. This is a local boundary decision, not a general registration flag or a `local-client` access model: registering another Settings namespace still does not expose it. Permission changes emit `host/settings-changed` but not `host/models-changed`.
## Consequences
Changing Permission in Settings updates `settings.yaml` and the selector immediately, but does not alter the open session. Every later session is reconstructable from its three pinned permission facts, including after the user changes the default again or the process restarts. Deployments whose composed sandbox and approval defaults match no preset must configure `defaultPreset` explicitly.
The assembled Web snapshot now contains a functional Permission selector. Its keyless browser scenario writes `read-only`, verifies an existing `danger-full-access` session is unchanged, and verifies a subsequently created session starts with the read-only event triplet.
## Alternatives considered
**Apply the Settings value live to every session.** Rejected because execution policy would change without a session event and replay could not reconstruct which permission governed an earlier tool call.
**Record only `permission/preset` on creation.** Rejected because sandbox and approval are independently owned whole-value knobs; pinning all three facts keeps their consumers independent of future composition-default changes.
**Expose all Settings registrations, or add a generic `local-client` declaration.** Rejected for this change because it expands a security boundary and the Settings contract beyond the one requested preference. The explicit `permission` allowlist entry is sufficient and leaves future namespaces to make their own exposure decision.
**Apply the latest default while resuming a seeded session.** Rejected because resume must preserve the session's prior effective execution policy; missing legacy facts are materialized from that policy instead.

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# Agent Note: 新会话的权限 Settings 默认值
Status: implemented
[English](2026-07-31-permission-default-for-new-sessions.md) | 中文
## 问题
Web「通用」设置页将「权限」显示为禁用的骨架控件,尽管 `dsh-permission` 已经拥有 preset 表和当前会话的切换路径。Settings seam 可以持久化由插件拥有的值,但 Web Settings API 只暴露可配置 LLM 提供方的 namespace。更重要的是,如果把用户偏好当成实时生效的全局权限,现有会话的执行策略就会在其持久日志之外发生变化。
## 决策
`dsh-permission` 拥有一个 `permission` Settings namespace,其中只有 `defaultPreset` 字段。它的基础值是 `Config.defaultPreset`;省略该配置时,则使用与组合后的沙箱和审批默认值匹配的 preset。schema 的 enum 从已配置的 preset 表派生,因此 Settings 既能校验已存储的值,Web 客户端也能发现部署中的实际选项,而无需重复定义。
服务会在 `session/created` 时同步读取当前 Settings 值。真正的新会话会收到三个显式事件:`permission/preset`、`sandbox/mode` 和 `approval/policy`。这些事实将创建时选中的权限固定下来,因此后续 Settings 变更只影响之后的会话。带 seed 或只完成部分初始化的会话会保留其有效调节项,只补齐缺失的事实;恢复时绝不会采用最新的用户默认值。
现有 `/permission` 命令和 `permissions` 投影仍是当前会话的操作路径。浏览器插件现在向 `settings.general.item` 贡献「权限」行,从脱敏后的 Settings 描述符读取动态 enum,并只通过经过 revision 校验的 `settings.mutate` 写入 `defaultPreset`。无归属的「通用」设置包只保留「工具调用」骨架。
ApiProxy 在可配置提供方 namespace 之外,将 `permission` 显式加入 Web Settings allowlist。这是局部的边界决策,而不是通用注册标志或 `local-client` 访问模型:注册其他 Settings namespace 仍不会将其暴露。权限变更会发出 `host/settings-changed`,但不会发出 `host/models-changed`。
## 后果
在 Settings 中更改「权限」会立即更新 `settings.yaml` 和选择器,但不会改变已打开的会话。之后的每个会话都可以从三个已固定的权限事实中重建,即使用户再次更改默认值或进程重启也不受影响。如果部署中组合后的沙箱和审批默认值与任何 preset 都不匹配,则必须显式配置 `defaultPreset`。
组装后的 Web 快照现在包含功能完整的「权限」选择器。其无密钥浏览器场景会写入 `read-only`,验证现有的 `danger-full-access` 会话保持不变,并验证随后创建的会话以 read-only 事件三元组启动。
## 曾考虑的替代方案
**将 Settings 值实时应用于每个会话。** 不予采纳,因为执行策略会在没有会话事件的情况下改变,重放也无法重建先前工具调用采用了哪种权限。
**创建时只记录 `permission/preset`。** 不予采纳,因为沙箱和审批是由不同组件独立拥有的全量值调节项;固定全部三个事实,可以让其消费方不依赖未来的组合默认值变化。
**暴露所有 Settings 注册,或增加通用的 `local-client` 声明。** 本次变更不予采纳,因为这会扩大安全边界,并使 Settings 契约超出所请求的单项偏好。显式加入 `permission` allowlist 已足够,未来的 namespace 可以各自决定是否暴露。
**恢复带 seed 的会话时应用最新默认值。** 不予采纳,因为恢复操作必须保留会话先前的有效执行策略;缺失的旧版事实应从该策略中补齐。