This commit consolidates a large set of host-mode security and UX fixes across backend and frontend.
Security / execution model:
- Make permission/execution mode switches apply immediately (no deferred pending-only behavior).
- Keep runtime mode change notices durable and visible via user-message guidance path.
- Add explicit runtime message source taxonomy support and persistence:
user / presend / guidance / notify / sub_agent / background_command.
- Ensure guidance/notify insertion is batched per tool-cycle so mid-run inserts are committed together.
- Separate notify from guidance semantics for mode-change notices.
- Add direct-mode auto-fallback handling visibility on frontend.
Approval and command gating:
- Align run_command approval pre-check logic with docker behavior for approval/auto_approval modes in host execution paths.
- Keep approval retry flow and final-result semantics intact when permission errors trigger approval.
- Externalize forbidden command keyword list into JSON config:
config/forbidden_commands.json.
- Update forbidden command rejection message to user-facing wording:
用户不允许执行包含“... ”的指令.
Prompt/runtime guidance:
- Refine execution-mode runtime rule text to avoid endless workaround loops:
one safe alternative first, then request switching to direct mode when truly required.
Chat rendering / message UX:
- Prevent injected guidance/notify user-messages from incorrectly triggering assistant work header/timer chain.
- Restore correct visibility after history reload while preserving runtime-source behavior.
- Update user-header icon/label rendering by message source:
- guidance -> 引导 + navigation icon
- notify/sub_agent/background_command -> 通知 + bell icon
- user/presend -> keep normal user header.
- Add new icons: static/icons/navigation.svg, static/icons/bell.svg.
Approval panel UX:
- Convert desktop approval panel from layout-compress sidebar to overlay + blur sheet.
- Fix panel transition behavior (remove unintended vertical motion; use dedicated desktop overlay transition).
- Improve approval result display:
- decision and reason split lines,
- green/red status styling,
- multiline reason rendering,
- auto-collapse delay adjusted to 3s.
Execution mode TTL feedback:
- When direct mode auto-expires to sandbox, frontend menu state is updated from status snapshot.
- Show non-auto-dismiss warning toast to explicitly notify auto-fallback.
Misc consistency updates:
- Execution mode label text cleanup in composer.
- Runtime notice wording normalization (权限模式修改为..., 执行环境修改为...).
Build/test notes:
- Frontend rebuilt after UI changes.
- Smoke tests passed for server refactor path.
This commit lands a broad host-security architecture update focused on enforceable sandbox execution, clearer permission semantics, and operator usability.
Core execution/security changes
- Introduce and wire a unified host sandbox runner for multi-OS execution:
- macOS: sandbox-exec
- Linux: bubblewrap + seccomp
- Windows: WSL2 path
- Remove silent fallback behavior in failure paths; sandbox-unavailable cases now fail closed instead of dropping to unsafe host execution.
- Ensure host execution mode (sandbox/direct) is propagated consistently into runtime components, including sub-agent startup.
Permission mode model upgrade
- Rework readonly/approval behavior for run_command from brittle command-text gating to execution-layer enforcement:
- readonly: run_command executes in read-only sandbox profile.
- approval: run_command first executes read-only; when permission-denied is detected, request approval and retry once with writable sandbox for that single call.
- Tool loop now returns final post-approval execution result, not intermediate permission-denied payloads.
- Update permission-mode system messaging to describe user-visible behavior without exposing internal implementation details.
Path authorization system
- Add dynamic host policy module and persisted policy file.
- Support dual path classes:
- writable_paths (read+write)
- readable_extra_paths (read-only)
- Enforce file access in file_manager by access type (read vs write) under host mode.
- Add host-only frontend 路径授权 management dialog (settings三级菜单入口), including mode switch between 可读可写 and 仅可读 with separate drafts and save flow.
Sub-agent and terminal alignment
- Sub-agent process launch now respects host execution mode and sandbox controls in host mode.
- Keep terminal session model compatible with sandbox-first behavior and execution-mode propagation.
Tool surface updates
- Remove legacy file-management tools from active tool definitions (create_file/create_folder/rename_file/delete_file) while preserving historical conversation compatibility.
Docs updates
- Add dedicated architecture doc: docs/host_sandbox_and_permission_model.md
- Refresh README and AGENTS sections to reflect updated permission/execution model and path-authorization semantics.
Validation performed
- python unittest smoke suite passes: test.test_server_refactor_smoke
- frontend build passes: npm run build
- syntax checks for touched Python modules completed
