oh-my-opencode/src/shared/AGENTS.md

SHARED UTILITIES KNOWLEDGE BASE

OVERVIEW

55 cross-cutting utilities: path resolution, token truncation, config parsing, model resolution.

STRUCTURE

shared/
├── tmux/                  # Tmux TUI integration (types, utils, constants)
├── logger.ts              # File-based logging (/tmp/oh-my-opencode.log)
├── dynamic-truncator.ts   # Token-aware context window management (194 lines)
├── model-resolver.ts      # 3-step resolution (Override → Fallback → Default)
├── model-requirements.ts  # Agent/category model fallback chains (132 lines)
├── model-availability.ts  # Provider model fetching & fuzzy matching (154 lines)
├── jsonc-parser.ts        # JSONC parsing with comment support
├── frontmatter.ts         # YAML frontmatter extraction (JSON_SCHEMA only)
├── data-path.ts           # XDG-compliant storage resolution
├── opencode-config-dir.ts # ~/.config/opencode resolution (143 lines)
├── claude-config-dir.ts   # ~/.claude resolution
├── migration.ts           # Legacy config migration logic (231 lines)
├── opencode-version.ts    # Semantic version comparison
├── permission-compat.ts   # Agent tool restriction enforcement
├── system-directive.ts    # Unified system message prefix & types
├── session-utils.ts       # Session cursor, orchestrator detection
├── shell-env.ts           # Cross-platform shell environment
├── agent-variant.ts       # Agent variant from config
├── zip-extractor.ts       # Binary/Resource ZIP extraction
├── deep-merge.ts          # Recursive object merging (proto-pollution safe, MAX_DEPTH=50)
├── case-insensitive.ts    # Case-insensitive object lookups
├── session-cursor.ts      # Session message cursor tracking
├── command-executor.ts    # Shell command execution (225 lines)
└── index.ts               # Barrel export for all utilities

MOST IMPORTED

Utility	Users	Purpose
logger.ts	16+	Background task visibility
system-directive.ts	8+	Message filtering
opencode-config-dir.ts	8+	Path resolution
permission-compat.ts	6+	Tool restrictions

WHEN TO USE

Task	Utility
Path Resolution	getOpenCodeConfigDir(), getDataPath()
Token Truncation	dynamicTruncate(ctx, sessionId, output)
Config Parsing	readJsoncFile<T>(path), parseJsonc(text)
Model Resolution	resolveModelWithFallback(client, reqs, override)
Version Gating	isOpenCodeVersionAtLeast(version)
YAML Metadata	parseFrontmatter(content)
Tool Security	createAgentToolAllowlist(tools)
System Messages	createSystemDirective(type), isSystemDirective(msg)
Deep Merge	deepMerge(target, source)

KEY PATTERNS

3-Step Resolution (Override → Fallback → Default):

const model = resolveModelWithFallback({
  userModel: config.agents.sisyphus.model,
  fallbackChain: AGENT_MODEL_REQUIREMENTS.sisyphus.fallbackChain,
  availableModels: fetchedModels,
})

System Directive Filtering:

if (isSystemDirective(message)) return  // Skip system-generated
const directive = createSystemDirective("TODO CONTINUATION")

ANTI-PATTERNS

• Raw JSON.parse: Use jsonc-parser.ts for comment support
• Hardcoded Paths: Use *-config-dir.ts or data-path.ts
• console.log: Use logger.ts for background task visibility
• Unbounded Output: Use dynamic-truncator.ts to prevent overflow
• Manual Version Check: Use opencode-version.ts for semver safety