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BTerminal — Claude Behavioral Guide

Workflow

  • v1 is a single-file Python app (bterminal.py). Changes are localized.
  • v2 docs are in docs/. Architecture decisions are in docs/task_plan.md.
  • v2 Phases 1-7 + multi-machine (A-D) + profiles/skills complete. Extras: SSH, ctx, themes, detached mode, auto-updater, shiki, copy/paste, session resume, drag-resize, session groups, Deno sidecar, Claude profiles, skill discovery.
  • v3 Mission Control (All Phases 1-10 Complete + S-1 Phase 1/1.5/2/3 + S-2 Session Anchors + Provider Adapter Pattern + Provider Runners + Memora Adapter): project groups, workspace store, 12 Workspace components, session continuity, workspace teardown, file overlap conflict detection, inotify-based external write detection, multi-provider adapter pattern (3 phases + Codex/Ollama runners), worktree isolation, session anchors, Memora adapter (read-only SQLite), dead v2 component cleanup. 286 vitest + 49 cargo tests.
  • v3 docs: docs/v3-task_plan.md, docs/v3-findings.md, docs/v3-progress.md.
  • Consult Memora (tag: bterminal) before making architectural changes.

Documentation References

Rules

  • Do not modify v1 code (bterminal.py) unless explicitly asked — it is production-stable.
  • v2/v3 work goes on the v2-mission-control branch, not master.
  • v2 architecture decisions must reference docs/task_plan.md Decisions Log.
  • v3 architecture decisions must reference docs/v3-task_plan.md Decisions Log.
  • When adding new decisions, append to the Decisions Log table with date.
  • Update docs/progress.md after each significant work session.

Key Technical Constraints

  • WebKit2GTK has no WebGL — xterm.js must use Canvas addon explicitly.
  • Agent sessions use @anthropic-ai/claude-agent-sdk query() function (migrated from raw CLI spawning due to piped stdio hang bug). SDK handles subprocess management internally. All output goes through the adapter layer (src/lib/adapters/claude-messages.ts via message-adapters.ts registry) — SDK message format matches CLI stream-json. Multi-provider support: message-adapters.ts routes by ProviderId to provider-specific parsers (claude-messages.ts, codex-messages.ts, ollama-messages.ts — all 3 registered).
  • Sidecar uses per-provider runner bundles (sidecar/dist/{provider}-runner.mjs). Currently only claude-runner.mjs exists. SidecarManager.resolve_sidecar_for_provider(provider) finds the right runner file. Deno preferred (faster startup), Node.js fallback. Communicates with Rust via stdio NDJSON. Claude CLI auto-detected at startup via findClaudeCli() — checks ~/.local/bin/claude, ~/.claude/local/claude, /usr/local/bin/claude, /usr/bin/claude, then which claude. Path passed to SDK via pathToClaudeCodeExecutable option. Agents error immediately if CLI not found. Provider env var stripping: strip_provider_env_var() strips CLAUDE*/CODEX*/OLLAMA* vars (whitelists CLAUDE_CODE_EXPERIMENTAL_*). Dual-layer: (1) Rust env_clear() + clean_env, (2) JS runner SDK env option. Session stop uses AbortController.abort(). agent-runner-deno.ts exists as standalone alternative runner but is NOT used by SidecarManager.
  • AgentPane does NOT stop agents in onDestroy — onDestroy fires on layout remounts, not just explicit close. Stop-on-close is handled externally (was TilingGrid in v2, now workspace teardown in v3).
  • Agent dispatcher (src/lib/agent-dispatcher.ts) is a singleton that routes sidecar events to the agent store. Provider-aware: sessionProviderMap routes messages through adaptMessage(provider, event) from message-adapters.ts. Handles subagent routing (project-scoped sessions skip layout pane, render in TeamAgentsPanel; detached mode creates layout pane). Session persistence via registerSessionProject(sessionId, projectId, provider) + persistSessionForProject() (saves state + messages to SQLite on complete).
  • AgentQueryOptions supports provider field (defaults to 'claude', flows Rust -> sidecar), provider_config blob (Rust passes through as serde_json::Value), permission_mode (defaults to 'bypassPermissions'), setting_sources (defaults to ['user', 'project']), system_prompt, model, claude_config_dir (for multi-account), additional_directories, worktree_name (when set, passed as extraArgs: { worktree: name } to SDK → --worktree <name> CLI flag).
  • Worktree isolation (S-1 Phase 3): Per-project useWorktrees toggle in SettingsTab. When enabled, AgentPane passes worktree_name=sessionId in queryAgent(). Agent runs in <repo>/.claude/worktrees/<sessionId>/. CWD-based detection: agent-dispatcher.ts detectWorktreeFromCwd() matches .claude/worktrees/, .codex/worktrees/, .cursor/worktrees/ patterns on init events → calls setSessionWorktree() for conflict suppression. Dual detection: CWD-based (primary, from init event) + tool_call-based extractWorktreePath() (subagent fallback).
  • Claude profiles: claude_list_profiles() reads ~/.config/switcher/profiles/ with profile.toml metadata. Profile set per-project in Settings (project.profile field), passed through AgentSession -> AgentPane profile prop -> resolved to config_dir for SDK. Profile name shown as info-only in ProjectHeader.
  • ProjectBox has project-level tab bar: Model | Docs | Context | Files | SSH | Memory. Three mount strategies: PERSISTED-EAGER (Model, Docs, Context — always mounted, display:flex/none), PERSISTED-LAZY (Files, SSH, Memory — mount on first activation via {#if everActivated} + display:flex/none). Tab type: 'model' | 'docs' | 'context' | 'files' | 'ssh' | 'memories'. Model tab = AgentSession+TeamAgentsPanel. Docs tab = ProjectFiles (markdown viewer). Context tab = ContextTab.svelte (LLM context window visualization: stats bar, segmented token meter, file references, turn breakdown; reads from agent store via sessionId prop; replaced old ContextPane ctx database viewer). Files tab = FilesTab.svelte (VSCode-style directory tree + CodeMirror 6 editor with 15 language modes, dirty tracking, Ctrl+S save, save-on-blur setting, image display via convertFileSrc, 10MB gate; CodeEditor.svelte wrapper; PdfViewer.svelte for PDF files via pdfjs-dist with canvas multi-page rendering + zoom 0.5x–3x; CsvTable.svelte for CSV with RFC 4180 parser, delimiter auto-detect, sortable columns). SSH tab = SshTab.svelte (CRUD for SSH connections, launch spawns terminal tab in Model tab). Memory tab = MemoriesTab.svelte (pluggable via MemoryAdapter interface in memory-adapter.ts; MemoraAdapter registered at startup, reads ~/.local/share/memora/memories.db via Rust memora.rs). Rust backend: list_directory_children + read_file_content + write_file_content (FileContent tagged union: Text/Binary/TooLarge). Frontend bridge: files-bridge.ts.
  • ProjectHeader shows CWD (ellipsized from START via direction: rtl) + profile name as info-only text on right side. AgentPane no longer has DIR/ACC toolbar — CWD and profile are props from parent.
  • Skill discovery: claude_list_skills() reads ~/.claude/skills/ (dirs with SKILL.md or .md files). claude_read_skill() reads content. AgentPane / prefix triggers autocomplete menu. Skill content injected as prompt via expandSkillPrompt().
  • claude-bridge.ts adapter wraps profile/skill Tauri commands (ClaudeProfile, ClaudeSkill interfaces). provider-bridge.ts wraps claude-bridge as generic provider bridge (delegates by ProviderId).
  • Provider adapter pattern: ProviderId = 'claude' | 'codex' | 'ollama'. ProviderCapabilities flags gate UI (hasProfiles, hasSkills, hasModelSelection, hasSandbox, supportsSubagents, supportsCost, supportsResume). ProviderMeta registered via registerProvider() in App.svelte onMount. AgentPane receives provider + capabilities props. SettingsTab has Providers section with collapsible per-provider config panels. ProjectConfig.provider field for per-project selection. Settings persisted as provider_settings JSON blob.
  • Sidecar build: npm run build:sidecar builds all 3 runners via esbuild (claude-runner.mjs, codex-runner.mjs, ollama-runner.mjs). Each is a standalone ESM bundle. Codex runner dynamically imports @openai/codex-sdk (graceful failure if not installed). Ollama runner uses native fetch (zero deps).
  • Agent preview terminal: AgentPreviewPane.svelte is a read-only xterm.js terminal (disableStdin:true) that subscribes to an agent session's messages via $derived(getAgentSession(sessionId)) and renders tool calls/results in real-time. Bash commands shown as cyan ❯ cmd, file ops as yellow [Read] path, results as plain text (80-line truncation), errors in red. Spawned via 👁 button in TerminalTabs (appears when agentSessionId prop is set). TerminalTab type: 'agent-preview' with agentSessionId field. Deduplicates — won't create two previews for the same session. ProjectBox passes mainSessionId to TerminalTabs.
  • Maximum 4 active xterm.js instances to avoid WebKit2GTK memory issues. Agent preview uses disableStdin and no PTY so is lighter, but still counts.
  • Store files using Svelte 5 runes ($state, $derived) MUST have .svelte.ts extension (not .ts). Import with .svelte suffix. Plain .ts compiles but fails at runtime with "rune_outside_svelte".
  • Session persistence uses rusqlite (bundled) with WAL mode. Data dir: dirs::data_dir()/bterminal/sessions.db.
  • Layout store persists to SQLite on every addPane/removePane/setPreset/setPaneGroup change (fire-and-forget). Restores on app startup via restoreFromDb().
  • Session groups: Pane.group? field in layout store, group_name column in sessions table, collapsible group headers in sidebar. Right-click pane to set group.
  • File watcher uses notify crate v6, watches parent directory (NonRecursive), emits file-changed Tauri events.
  • Settings use key-value settings table in SQLite (session.rs). Frontend: settings-bridge.ts adapter. v3 uses SettingsTab.svelte rendered in sidebar drawer panel (v2 SettingsDialog.svelte deleted in P10). SettingsTab has two sections: Global (single-column layout, split into Appearance [theme dropdown, UI font dropdown with sans-serif options + size stepper, Terminal font dropdown with monospace options + size stepper] and Defaults [shell, CWD] — all custom themed dropdowns, no native <select>, all persisted via settings-bridge with keys: theme, ui_font_family, ui_font_size, term_font_family, term_font_size, default_shell, default_cwd) and Group/Project CRUD.
  • Notifications use ephemeral toast system: notifications.svelte.ts store (max 5, 4s auto-dismiss), ToastContainer.svelte display. Agent dispatcher emits toasts on agent complete/error/crash.
  • StatusBar → Mission Control bar: running/idle/stalled agent counts (color-coded), total $/hr burn rate, "needs attention" dropdown priority queue (up to 5 cards sorted by urgency score, click-to-focus), total tokens + cost. Uses health.svelte.ts store (not workspace store for health signals).
  • health.svelte.ts store: per-project health tracking via ProjectTracker map. ActivityState = inactive|running|idle|stalled (configurable per-project via stallThresholdMin in ProjectConfig, default 15 min, range 5–60 min step 5, synced via setStallThreshold() API). Burn rate from 5-min EMA costSnapshots. Context pressure = tokens/model limit. File conflict count from conflicts.svelte.ts. Attention scoring: stalled=100, error=90, ctx>90%=80, file_conflict=70, ctx>75%=40. 5-second tick timer (auto-stop/start). API: trackProject(), recordActivity(), recordToolDone(), recordTokenSnapshot(), getProjectHealth(), getAttentionQueue(), getHealthAggregates().
  • conflicts.svelte.ts store: per-project file overlap + external write detection. Records Write/Edit/Bash-write tool_call file paths per session. Detects when 2+ sessions in same worktree write same file. S-1 Phase 2: inotify-based external write detection via fs_watcher.rs — uses 2s timing heuristic (AGENT_WRITE_GRACE_MS) to distinguish agent writes from external. EXTERNAL_SESSION_ID='external' sentinel. Worktree-aware. Dismissible. recordExternalWrite() for inotify events. FileConflict.isExternal flag, ProjectConflicts.externalConflictCount. Session-scoped, no persistence.
  • tool-files.ts utility: shared extractFilePaths(tc) → ToolFileRef[], extractWritePaths(tc) → string[], extractWorktreePath(tc) → string|null. Bash write detection via regex (>, >>, sed -i, tee, cp, mv). Used by ContextTab (all ops) and agent-dispatcher (writes + worktree tracking for conflict detection).
  • ProjectHeader shows status dot (green pulse=running, gray=idle, orange pulse=stalled, dim=inactive) + external write badge (orange ⚡ clickable, shown when externalConflictCount > 0) + agent conflict badge (red ⚠ clickable with ✕) + context pressure badge (>90% red, >75% orange, >50% yellow) + burn rate badge ($/hr). Health prop from ProjectBox via getProjectHealth(). ProjectBox starts/stops fs watcher per project CWD via $effect.
  • session_metrics SQLite table: per-project historical session data (project_id, session_id, timestamps, peak_tokens, turn_count, tool_call_count, cost_usd, model, status, error_message). 100-row retention per project. Tauri commands: session_metric_save, session_metrics_load. Persisted on agent completion via agent-dispatcher.
  • Session anchors (S-2): Preserves important turns through compaction chains. Types: auto (on first compaction, 3 turns, observation-masked — reasoning preserved in full, only tool outputs compacted), pinned (user-created via pin button in AgentPane), promoted (user-promoted from pinned, re-injectable). Configurable budget via AnchorBudgetScale ('small'=2K|'medium'=6K|'large'=12K|'full'=20K) — per-project slider in SettingsTab, stored as ProjectConfig.anchorBudgetScale in groups.json. Re-injection: anchors.svelte.ts → AgentPane.startQuery() → system_prompt field → sidecar → SDK. ContextTab shows anchor section with budget meter (derived from scale) + promote/demote. SQLite: session_anchors table. Files: types/anchors.ts, adapters/anchors-bridge.ts, stores/anchors.svelte.ts, utils/anchor-serializer.ts.
  • Agent tree (AgentTree.svelte) uses SVG with recursive layout. Tree data built by agent-tree.ts utility from agent messages.
  • ctx integration opens ~/.claude-context/context.db as SQLITE_OPEN_READ_ONLY — never writes. CtxDb uses Option for graceful absence if DB doesn't exist.
  • SSH sessions spawn TerminalPane with shell=/usr/bin/ssh and args array. No SSH library needed — PTY handles it natively.
  • Theme system: 17 themes in 3 groups — 4 Catppuccin + 7 Editor (VSCode Dark+, Atom One Dark, Monokai, Dracula, Nord, Solarized Dark, GitHub Dark) + 6 Deep Dark (Tokyo Night, Gruvbox Dark, Ayu Dark, Poimandres, Vesper, Midnight). All map to same 26 --ctp-* CSS custom properties — zero component changes needed. ThemeId replaces CatppuccinFlavor. getCurrentTheme()/setTheme() are primary API (deprecated wrappers exist). THEME_LIST has ThemeMeta with group metadata for custom dropdown UI. Open terminals hot-swap via onThemeChange() callback registry in theme.svelte.ts. Typography uses --ui-font-family/--ui-font-size (UI elements, sans-serif fallback) and --term-font-family/--term-font-size (terminal, monospace fallback) CSS custom properties (defined in catppuccin.css). initTheme() restores all 4 font settings (ui_font_family, ui_font_size, term_font_family, term_font_size) from SQLite on startup.
  • Detached pane mode: App.svelte checks URL param ?detached=1 and renders a single pane without sidebar/grid chrome. Used for pop-out windows.
  • Shiki syntax highlighting uses lazy singleton pattern (avoid repeated WASM init). 13 languages preloaded. Used in MarkdownPane and AgentPane text messages.
  • Cargo workspace at v2/ level: members = [src-tauri, bterminal-core, bterminal-relay]. Cargo.lock is at workspace root (v2/), not in src-tauri/.
  • EventSink trait (bterminal-core/src/event.rs) abstracts event emission. PtyManager and SidecarManager are in bterminal-core, not src-tauri. src-tauri has thin re-exports.
  • RemoteManager (src-tauri/src/remote.rs) manages WebSocket client connections to bterminal-relay instances. 12 Tauri commands prefixed with remote_.
  • remote-bridge.ts adapter wraps remote machine management IPC. machines.svelte.ts store tracks remote machine state.
  • Pane.remoteMachineId?: string routes operations through RemoteManager instead of local managers. Bridge adapters (pty-bridge, agent-bridge) check this field.
  • bterminal-relay binary (v2/bterminal-relay/) is a standalone WebSocket server with token auth, rate limiting, and per-connection isolated managers. Commands return structured responses (pty_created, pong, error) with commandId for correlation via send_error() helper.
  • RemoteManager reconnection: exponential backoff (1s-30s cap) on disconnect, attempt_tcp_probe() (TCP-only, no WS upgrade), emits remote-machine-reconnecting and remote-machine-reconnect-ready events. Frontend listeners in remote-bridge.ts; machines store auto-reconnects on ready.
  • v3 workspace store (workspace.svelte.ts) replaces layout store for v3. Groups loaded from ~/.config/bterminal/groups.json via groups-bridge.ts. State: groups, activeGroupId, activeTab, focusedProjectId. Derived: activeGroup, activeProjects.
  • v3 groups backend (groups.rs): load_groups(), save_groups(), default_groups(). Tauri commands: groups_load, groups_save.
  • Telemetry (telemetry.rs): tracing + optional OTLP export to Tempo. BTERMINAL_OTLP_ENDPOINT env var controls (absent = console-only). TelemetryGuard in AppState with Drop-based shutdown. Frontend events route through frontend_log Tauri command → Rust tracing (no browser OTEL SDK — WebKit2GTK incompatible). telemetry-bridge.ts provides tel.info/warn/error() convenience API. Docker stack at docker/tempo/ (Grafana port 9715).
  • v3 SQLite additions: agent_messages table (per-project message persistence), project_agent_state table (sdkSessionId, cost, status per project), sessions.project_id column.
  • v3 App.svelte: VSCode-style sidebar layout. Horizontal: left icon rail (GlobalTabBar, 2.75rem, single Settings gear icon) + expandable drawer panel (Settings only, content-driven width, max 50%) + main workspace (ProjectGrid always visible) + StatusBar. Sidebar has Settings only — Sessions/Docs/Context are project-specific (in ProjectBox tabs). Keyboard: Ctrl+B (toggle sidebar), Ctrl+, (settings), Escape (close).
  • v3 component tree: App -> GlobalTabBar (settings icon) + sidebar-panel? (SettingsTab) + workspace (ProjectGrid) + StatusBar. See docs/v3-task_plan.md for full tree.
  • MarkdownPane reactively watches filePath changes via $effect (not onMount-only). Uses sans-serif font (Inter, system-ui), all --ctp-* theme vars. Styled blockquotes with translucent backgrounds, table row hover, link hover underlines. Inner .markdown-pane-scroll wrapper with container-type: inline-size for responsive padding via --bterminal-pane-padding-inline.
  • AgentPane UI (redesigned 2026-03-09): sans-serif root font (system-ui, -apple-system, sans-serif), monospace only on code/tool names. Tool calls paired with results in collapsible <details> groups via $derived.by toolResultMap (cache-guarded by tool_result count). Hook messages collapsed into compact <details> with gear icon. Context window meter inline in status strip. Cost bar minimal (no background, subtle border-top). Session summary with translucent surface background. Two-phase scroll anchoring ($effect.pre + $effect). Tool-aware output truncation (Bash 500 lines, Read/Write 50, Glob/Grep 20, default 30). Colors softened via color-mix(). Inner .agent-pane-scroll wrapper with container-type: inline-size for responsive padding via shared --bterminal-pane-padding-inline variable.
  • ProjectBox uses CSS style:display (flex/none) instead of {#if} for tab content panes — keeps AgentSession mounted across tab switches (prevents session ID reset and message loss). Terminal section also uses style:display. Grid rows: auto auto 1fr auto.
  • Svelte 5 event syntax: use onclick not on:click. Svelte 5 requires lowercase event handler attributes (no colon syntax).

Memora Tags

Project tag: bterminal Common tag combinations: bterminal,architecture, bterminal,research, bterminal,tech-stack

Operational Rules

All operational rules live in .claude/rules/. Every .md file in that directory is automatically loaded at session start by Claude Code with the same priority as this file.

Rule Index

# File Scope
01 security.md PARAMOUNT — secrets, input validation, least privilege
02 error-handling.md PARAMOUNT — handle every error visibly
03 environment-safety.md PARAMOUNT — verify target, data safety, K8s isolation, cleanup
04 communication.md Stop on ambiguity, scope discipline
05 git-practices.md Conventional commits, authorship
06 testing.md TDD, unit tests, E2E tests
07 documentation.md README, CLAUDE.md sync, docs/
08 branch-hygiene.md Branches, naming, clean state before refactors
09 dependency-discipline.md No deps without consent
10 code-consistency.md Match existing patterns
11 api-contracts.md Contract-first, flag breaking changes (path-conditional)
12 performance-awareness.md No N+1, no unbounded fetches (path-conditional)
13 logging-observability.md Structured logging, OTEL (path-conditional)
14 resilience-and-config.md Timeouts, circuit breakers, externalized config (path-conditional)
15 memora.md Persistent memory across sessions
16 sub-agents.md When to use sub-agents and team agents
17 document-imports.md Resolve @ imports in CLAUDE.md before acting
18 relative-units.md Use rem/em for layout, px only for icons/borders
51 theme-integration.md All colors via --ctp-* CSS vars, never hardcode
52 no-implicit-push.md Never push unless explicitly asked