openchamber/packages/vscode/src/DOCUMENTATION.md

VS Code Backend Modules

This document describes backend runtime modules used by the VS Code extension bridge (packages/vscode/src/bridge.ts).

Purpose

Keep bridge.ts as a thin orchestration layer that delegates message handling to cohesive domain runtimes while preserving API behavior.

Runtime modules

• bridge.ts

  • Entry orchestration layer for bridge messages.
  • Delegates to specialized runtimes in order and handles only unmatched fallthrough cases.

• bridge-git-runtime.ts

  • Standard Git message handlers.

• bridge-git-special-runtime.ts

  • Specialized Git flows (pr-description, conflict-details) and generation helpers.

• bridge-git-process-runtime.ts

  • Git process execution and environment setup (execGit), including SSH agent socket resolution.

• gitService.ts

  • Owns VS Code Git and worktree operations.
  • Fetches the current tracked source branch once before worktree creation. Fetch failure falls back to the local branch and reports it to the shared UI.
  • Fast worktree creation reports bootstrap phases explicitly: directory-created, then git-ready after Git population/upstream work, and setup-ready after setup commands. Existing worktrees without tracked bootstrap state fall back to ready/setup-ready; shared webview consumers also accept legacy responses without phase.
  • Worktree removal waits for an active create/bootstrap task for the same directory so background Git and setup work cannot race deletion or restore stale bootstrap state.
  • Worktree population enables Git core.longpaths (local repo config plus -c core.longpaths=true on git reset --hard) so deeply nested checkouts under the managed data-dir worktree root do not fail on Windows MAX_PATH with "Filename too long".

• bridge-fs-runtime.ts

  • Bridge handlers for filesystem-related message routes.
  • Uses shared FS helpers via injected dependencies.

• bridge-fs-helpers-runtime.ts

  • Filesystem/path/search helper functions:
    • path normalization and resolution
    • directory listing
    • file search
    • file read path safety checks
    • active-directory selection across multi-root workspaces
    • dropped-file parsing and attachment reading
    • models metadata fetch helper
  • Read paths are authorized in the requested workspace path space before symlink resolution, matching the web runtime; directly requested outside-workspace paths remain denied.

The webview CSP permits blob: only for worker-src so shared UI parsers can run bounded local decompression off the main thread. Blob scripts remain disallowed by script-src.

The webview build emits each worker as one self-contained file. VS Code webviews cannot load workers directly from extension resource URLs or load module imports from inside a worker. The shared Shiki client therefore fetches the built worker, starts it from a blob: URL, and relies on the worker CSP allowance above.

• bridge-localfs-proxy-runtime.ts

  • Local /api/fs/read and /api/fs/raw proxy helpers and shared proxy utility helpers.
  • Workspace-contained Markdown gallery images use these local filesystem routes without calling the server grant route. Grant requests for OpenCode temporary-directory images return an explicit unsupported response instead of being forwarded to OpenCode.

• bridge-proxy-runtime.ts

  • Proxy route handlers (api:proxy, api:session:message) with injected helper dependencies.
  • SSE routes are intentionally excluded from the generic proxy and use sseProxy.ts, whose upstream-only stall watchdog closes a quiet OpenCode stream so the webview can reconnect instead of trusting an open but silent response.
  • The webview allocates each SSE stream ID and installs its listener before requesting the upstream stream, so immediate OpenCode replay events cannot race the bridge start response.

• bridge-config-runtime.ts

  • Config and skills message handlers (api:config/*).
  • Includes OpenCode resolution diagnostics parity handler used by shared UI (/api/config/opencode-resolution).
  • OpenCode JSONC reads in opencodeConfig.ts fail closed on a partial or non-object jsonc-parser tree (INVALID_JSONC) so mutations cannot rewrite a $schema-only stub over an existing config. Comment-only files read as empty, while other content that yields no JSON value (YAML, plain text) fails closed. A broken layer is omitted from the merge and recorded on layerErrors; valid sibling layers still load, including plugin list/read via getPluginConfigSources. Writes still refuse to overwrite the broken file.

• bridge-settings-runtime.ts

  • Settings read/write and OpenCode skills discovery via API for bridge consumers.

• bridge-system-runtime.ts

  • System/editor/provider/quota/notification/update-check message handlers.
  • Includes session activity snapshot bridge handler used by webview parity routes (/api/session-activity).
  • Includes Zen utility model parity handler used by shared notification settings (/api/zen/models).
  • Owns managed OpenCode upgrade status and mutation handlers, including capability reporting, upgrade serialization, and process restart after a successful upgrade.
  • Provider handlers cover source lookup, disconnect (DELETE /api/provider/:id/auth), and custom provider upsert (PUT /api/provider; create/update OpenAI-compatible config with explicit scope for user/project/custom layers; requires env or stored auth; secrets via OpenCode auth API). Updates preserve existing provider, option, and retained-model fields that the form does not manage while honoring explicit model, header, and env removal. Legacy providers entries migrate to the canonical provider key when edited.
  • Quota handlers keep managed exe.dev, Ollama Cloud, and Cursor credentials in the extension data directory with the same private-file contract as the web runtime. exe.dev uses one command-scoped usage token for the aggregate billing shared by every exe-* model provider.

• opencode-upgrade-runtime.ts

  • Owns managed-versus-external capability decisions, latest-version checks, serialized OpenCode self-upgrades, and restart-after-upgrade behavior.

• bridge-permission-auto-accept-runtime.ts

  • Owns the persisted VS Code permission auto-accept policy and its GET/PUT bridge contract.
  • Serializes reads and read-modify-write updates, persists a monotonic policy revision, and broadcasts the exact committed snapshot to every active OpenChamber webview. Permission replies remain foreground UI-owned because VS Code does not run the OpenChamber server runtime.

Shared webview message ordering

Message and part ordering is owned by packages/ui/src/sync/DOCUMENTATION.md. The VS Code webview consumes that shared sync implementation; bridge and proxy runtimes pass OpenCode records through without adding runtime-specific ordering.

Extension guideline

When adding new bridge route families:

1. Prefer creating or extending a domain runtime module under packages/vscode/src/bridge-*-runtime.ts.
2. Keep bridge.ts focused on delegation order and minimal fallthrough behavior.
3. Inject dependencies into runtimes instead of reaching into unrelated modules directly.

VS Code surface reachability map

Verified 2026-08-28 against 8f5eb231b.

Three webview hosts, all rendering renderVSCodeApp → VSCodeApp (packages/ui/src/apps/VSCodeApp.tsx):

• ChatViewProvider.ts — sidebar view, panelType: 'chat', viewMode: 'sidebar'.
• SessionEditorPanelProvider.ts — editor tab, panelType: 'chat', viewMode: 'editor'.
• AgentManagerPanelProvider.ts — editor tab, panelType: 'agentManager' → AgentManagerView, no VSCodeLayout.

VSCodeLayout has exactly three views: sessions, chat, settings (packages/ui/src/components/layout/VSCodeLayout.tsx:76). There is no MainLayout, no ContextPanel, and no ContextPanelRail in this runtime, so every surface reached only through those is unreachable.

Surfaces

Surface	Status	Mount chain / cut-off
Chat timeline	MOUNTED	VSCodeLayout → ChatView → ChatContainer → MessageList
Composer	MOUNTED	ChatContainer → ChatInput (model/agent controls, autocomplete, attachments, dictation, GitHub issue/PR pickers, ReviewFlowDialog, PendingChangesBar)
Work status panel	MOUNTED	ChatContainer → WorkStatusPanel
Permission / question cards	MOUNTED	ChatContainer → PermissionCard, QuestionCard
Timeline dialog	MOUNTED	ChatContainer → TimelineDialog
Tool output / inline diff preview	MOUNTED	MessageList → ToolPart, ToolOutputDialog (DiffViewToggle, not DiffView)
Sessions sidebar	MOUNTED	VSCodeLayout → SessionSidebar with mobileVariant hideDirectoryControls
Session dialogs	MOUNTED	VSCodeLayout → SessionDialogs
Session switcher	MOUNTED	VSCodeHeader → SessionSwitcherDropdown
MCP dropdown	MOUNTED	VSCodeHeader showMcp → McpDropdown
Context usage / rate limits	MOUNTED	VSCodeHeader showContextUsage / showRateLimits → ContextUsageDisplay, UsageProgressBar
Agent manager	MOUNTED	VSCodeApp panelType === 'agentManager' → AgentManagerView
Settings	PARTIAL	VSCodeLayout → lazy SettingsView. metadata.ts isAvailable: (ctx) => !ctx.isVSCode hides remote-instances, git, shortcuts, magic-prompts, voice, tunnel, about
Usage / quota page	MOUNTED	SettingsView → UsagePage (slug usage, no VS Code gate)
Notifications settings	MOUNTED	SettingsView → slug notifications (no VS Code gate)
MCP settings	MOUNTED	SettingsView → McpSidebar / McpPage
Agents / commands / skills / plugins / providers / projects settings	MOUNTED	SettingsView page registry
Worktrees	PARTIAL	Create/remove reachable via SessionSidebar → NewWorktreeDialog and sessionWorktreeMenu. WorktreesView is MainLayout-only
Git	PARTIAL	Read-only status/branches/log via useGitStore in SessionSidebar, ChatInput, WorkStatusPrimaryGroup. Stage/commit/push/history/merge/rebase live in GitView + views/git/*, cut off with ContextPanel
Voice / dictation	PARTIAL	ComposerDictation renders in ChatInput; the voice settings page is VS Code-gated
Command palette	PARTIAL	useKeyboardShortcuts runs from SyncAppEffects and open_command_palette toggles isCommandPaletteOpen, but CommandPalette renders only in MainLayout — the shortcut opens nothing
ContextPanel / project context (notes, todos, plans tabs)	NOT MOUNTED	ContextPanel, ContextPanelRail, RightSidebarTabs imported only by MainLayout and MobileWorkspaceDrawer
Terminal	NOT MOUNTED	TerminalView imported only by ContextPanel and MobileWorkspaceDrawer. webview/api/index.ts ships createStubTerminalAPI() whose every method throws unsupported
Files view	NOT MOUNTED	lazy FilesView in ContextPanel; SidebarFilesTree is MainLayout-only
Diff view	NOT MOUNTED	lazy DiffView in ContextPanel
Git view	NOT MOUNTED	lazy GitView in ContextPanel
Plan view	NOT MOUNTED	lazy PlanView in ContextPanel, ProjectNotesTodoPanel, MobileApp
Pull request view	NOT MOUNTED	PullRequestView imported only by ContextPanel
Browser panel	NOT MOUNTED	BrowserPane imported only by ContextPanel; RuntimeAPIs has no browser member in webview/api/index.ts
Walkthrough	NOT MOUNTED	WalkthroughView imported only by ContextPanel
Archive view	NOT MOUNTED	ArchiveView imported only by MainLayout
Scheduled tasks	NOT MOUNTED	ScheduledTasksDialog imported only by MainLayout
Memory debug panel	NOT MOUNTED	MemoryDebugPanel imported only by App.tsx (web/desktop root)
Mini chat	NOT MOUNTED	MiniChatLayout imported only by ElectronMiniChatApp

Dead bridge surface

Handlers with no reachable caller in the VS Code webview.

Handler	Why unreachable
api:git/ignore-openchamber	No reference anywhere in packages/vscode/webview
api:git/commit, api:git/commit-files, api:git/commit-file-diff	Only GitView and views/git/* call them
api:git/log (write paths), api:git/checkout, api:git/checkout-commit, api:git/reset-to-commit, api:git/revert-commit, api:git/cherry-pick	views/git/HistoryCommitRow.tsx only
api:git/merge, api:git/merge/abort, api:git/merge/continue, api:git/rebase, api:git/rebase/abort, api:git/rebase/continue, api:git/conflict-details	GitView only
api:git/push, api:git/pull, api:git/fetch	GitView and MobileChangesSurface only
api:git/diff, api:git/file-diff	DiffView only
api:git/pr-description	views/git/PullRequestSection.tsx only
api:git/identity	git settings page is VS Code-gated
api:github/pr:create, api:github/pr:merge, api:github/pr:ready, api:github/pr:update	views/git/PullRequestSection.tsx only. api:github/pr:status stays reachable through useGitHubPrStatusStore in the sidebar
api:fs:write, api:fs:rename, api:fs:delete, api:fs:reveal, api:fs:mkdir	FilesView, SidebarFilesTree, PlanView only
api:fs:exec	Terminal API is a throwing stub; no other caller

Reachable filesystem routes: api:fs:read (attachments, config), api:fs:search (useFileSearchStore behind composer file mentions), api:fs:list, api:fs:stat.

Maintenance: reviews, changelog entries, and parity claims consult this map; whoever mounts or unmounts a surface updates it in the same change.