src/

Responsibility

Core plugin implementation for oh-my-opencode-slim, providing:

Main plugin initialization and OpenCode integration (index.ts)
Dual v1/v2 host export: default.server (v1) + default.setup (v2 adapter via src/v2/)
Terminal User Interface (TUI) sidebar plugin for agent status display (tui.ts)
TUI state persistence and synchronization across sessions (tui-state.ts)
Three-level TUI /preset manager (tui-preset.ts)
Installer-managed plugin-entry marker (plugin-entry.ts)
Plugin init health-check thresholds and helpers (health-check.ts)

This directory serves as the primary entry point for the plugin's runtime behavior, configuration system, and user-facing UI components.

Design

Architectural Patterns

Plugin Pattern: The plugin follows OpenCode's plugin architecture with a single exported plugin function that returns agent, tool, and MCP registrations
Facade Pattern: index.ts acts as a facade that composes multiple subsystems (agents, tools, MCPs, hooks, multiplexer)
Observer Pattern: Event-driven architecture using OpenCode's event system for session lifecycle, message updates, and tool execution
Strategy Pattern: Runtime model selection and fallback via ForegroundFallbackManager
Singleton Pattern: MultiplexerSessionManager maintains single instance for task session management
Admission runtime lease: admission-runtime.ts scopes the background scheduler and pending-call tracker per directory, retaining them across immediate plugin-generation replacement and disposing them after the last owner is gone.

Data Flow

OpenCode Core → Plugin Initialization (index.ts)
  → Agent Registration (createAgents/getAgentConfigs)
  → Tool Registration (createCancelTaskTool, etc.)
  → MCP Registration (createBuiltinMcps)
  → Hook Registration (auto-update, phase reminders, cache monitor, etc.)
  → Event Subscription (session lifecycle, message updates, tool execution)
  → Runtime State Tracking (tui-state.ts)
  → TUI Rendering (tui.ts → sidebar_content slot)
  → TUI /preset Management (tui-preset.ts → preset-switch.ts)

Key Components

File	Role	Dependencies
`index.ts`	Main plugin entry, orchestrates all subsystems; exports dual `server`/`setup` default	Config system, agent factories, tool creators, multiplexer, hooks, v2 adapter
`admission-runtime.ts`	Per-directory scheduler/pending-call runtime lease	Background task concurrency, task-session pending calls
`tui.ts`	TUI sidebar plugin for agent model display	tui-state.ts, config constants, tmux-pane-registry
`tui-state.ts`	Persistent state management for TUI	Node.js fs/promises, os module
`tui-preset.ts`	Three-level `/preset` manager (preset list → agents → agent edit) using `api.ui` dialogs	preset-switch.ts, config loader/constants
`plugin-entry.ts`	Installer-managed plugin entry marker and `PluginEntry` type	none
`health-check.ts`	Init health-check thresholds and disabled-tool-aware minimum tool count	none (kept internal, not re-exported)

Flow

Plugin Initialization Flow (index.ts)

Config Loading: loadPluginConfig() reads and validates plugin configuration; RuntimeConfig singleton seeded and host config captured
Agent Creation: createAgents() instantiates agent definitions (incl. dynamic councillors) with prompts and permissions
Agent Configuration: getAgentConfigs() merges defaults with user overrides and runtime presets
Tool Registration: Tools are created conditionally based on config (task_cancel, task_message, task_revive, task_status, task_result, wait_for_user, marketplace, webfetch, AST-grep, acp_run)
MCP Registration: Built-in MCPs are created (context7, gh_grep)
Multiplexer Setup: Multiplexer session manager initialized for task tool sessions
Hook Initialization: Auto-update checker, phase reminders, skill filters, task-session manager, cache monitor, orchestrator-wake scheduler, etc.
Runtime Model Resolution: Resolves model arrays to single models for startup
TUI State Sync: recordTuiAgentModels() captures resolved models/variants for TUI display
Health Check: Validates agent/tool/MCP counts against HEALTH_CHECK thresholds, adjusted for disabled baseline tools via minimumExpectedToolCount
Companion Management: Ensures companion version compatibility

TUI Rendering Flow (tui.ts)

Plugin Registration: TUI plugin registered with OpenCode's TUI system via tui export
Version Detection: Reads plugin version from package.json or uses 'dev'
Config Validation: Checks if current directory has valid plugin config
Snapshot Loading: Reads agent models, variants, and per-session activity from tui-state.ts
Live Updates: Refreshes persisted state every 1000ms and reactively advances 100ms animation frames only while agents are active
Tmux registration: Refreshes the active session-to-TMUX_PANE registration for parent-aware child-pane routing
Sidebar Rendering: Renders sidebar with:
- Plugin header (OMO-Slim + version)
- Config status warning (if invalid)
- Agent list with model/variant details and Braille activity indicators
Lifecycle Management: Cleans up refresh/animation timers and owned tmux registration on dispose

State Persistence Flow (tui-state.ts)

State Path Resolution: Determines XDG-compliant state directory (~/.local/share/opencode/storage/oh-my-opencode-slim/tui-state.json)
Snapshot Operations:
- readTuiSnapshot(): Reads and parses state file (returns empty snapshot on error)
- readTuiSnapshotAsync(): Async variant for TUI rendering
- recordTuiAgentModels(): Updates both agent models and variants atomically
- recordTuiAgentModel(): Updates single agent's model/variant
- recordTuiAgentActivity(): Tracks active agents by session so concurrent runs of the same agent remain visible until all runs finish
- clearTuiAgentActivities(): Removes stale activity during startup
Atomic Writes: Cross-process file locking serializes each read → mutate → atomic rename transaction, with dead-owner and aged-lock recovery
Error Handling: All operations are best-effort; failures don't crash plugin
Instance Cleanup: On shutdown, each plugin instance removes only sessions it marked active, preserving activity owned by other running instances

Event Handling Flow (index.ts)

Key event flows:

Session Lifecycle:
- session.created → register child session
- session.status → multiplexer session management, Companion updates, and TUI activity state
- session.deleted → cleanup session agent map, Companion state, and TUI activity state
Message Updates:
- message.updated → record agent/model usage in TUI state
Tool Execution:
- tool.execute.before → apply patch and task session hooks
- tool.execute.after → post-tool hooks (retry guidance, JSON error recovery, file-tool nudges)
Chat Integration:
- chat.message → track session → agent mapping and mark TUI activity
- experimental.chat.system.transform → inject orchestrator prompt for serve mode
- experimental.chat.messages.transform → phase reminders, skill filtering, image attachment processing
Command Execution:
- command.execute.before → interview, deepwork, reflect, and loop command hooks (preset switching moved to the TUI)
Cache Telemetry:
- message.updated (completed assistant requests) → cache monitor observes tokens.cache.read/write and logs prompt-cache bust/plateau warnings

Integration

Consumers

OpenCode Core: Main plugin entry point consumed by OpenCode's plugin system
TUI System: tui.ts slot registration consumed by OpenCode's TUI renderer
Agents: Agent configurations consumed by OpenCode's agent registry
Tools: Tool definitions consumed by OpenCode's tool system
MCPs: MCP definitions consumed by OpenCode's MCP registry

Dependencies

Config System (src/config/): Configuration loading, validation, the RuntimeConfig runtime-state singleton, and runtime presets
Agents (src/agents/): Agent personalities and permission sets
Tools (src/tools/): Tool implementations (task lifecycle controls, webfetch, AST operations, ACP)
Hooks (src/hooks/): Lifecycle hooks for auto-update, phase reminders, cache monitor, orchestrator wake, etc.
Multiplexer (src/multiplexer/): Tmux/Zellij session management for child sessions
Council (src/agents/council.ts, src/agents/council-agents.ts): Multi-LLM council orchestration
Companion (src/companion/): Companion version management
Utils (src/utils/): Logger, environment checks, background job board/supervisor, session status
V2 Adapter (src/v2/): Wraps the v1 factory for the v2 host via default.setup

Cross-Directory Flow

Plugin Initialization: src/index.ts imports and composes all subsystems
State Synchronization: TUI state in src/tui-state.ts is updated during plugin init and message events
UI Integration: TUI plugin in src/tui.ts reads state and renders sidebar
Event Propagation: Events flow from OpenCode → plugin handlers → subsystems → state updates

Configuration Integration

Plugin config loaded via loadPluginConfig() with support for:
- User overrides from ~/.config/opencode/oh-my-opencode-slim.json
- Preset switching via the TUI /preset manager (persisted to the config file, applied on next reload)
- Environment-based disablement via OH_MY_OPENCODE_SLIM_DISABLE
Agent configurations merged with user settings from OpenCode config
Model resolution supports both string models and array-based fallback chains

Error Handling & Resilience

Config Errors: Non-fatal; plugin continues with defaults and logs warnings
State Errors: Non-fatal; TUI falls back to empty state
Event Errors: Wrapped in try/catch; plugin continues operation
Dependency Failures: Health checks detect missing dependencies (e.g., jsdom for webfetch)

Testing & Validation

Type Safety: TypeScript strict mode ensures type correctness
Health Checks: Validates minimum agent/tool/MCP registrations on init
Config Validation: Schema-based validation via Zod in config system
TUI State: Best-effort persistence; failures don't affect core functionality

Performance Considerations

Live Updates: TUI reads state every 1000ms and animates active Braille indicators every 100ms without extra disk reads
Atomic State: State writes are atomic to prevent corruption
Lazy Initialization: Some subsystems (e.g., webfetch probe) run async without blocking init
Event-Driven: Minimal polling; relies on OpenCode's event system

Future Extensions

Dynamic Agent Registration: Support runtime agent addition/removal
State Migration: Versioned state format for breaking changes
TUI Customization: Allow user-defined sidebar layouts
Performance Metrics: Track and display plugin performance in TUI

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