oh-my-openagent/AGENTS.md

oh-my-opencode — OpenCode Plugin

Generated: 2026-02-19 | Commit: 5dc437f4 | Branch: dev

OVERVIEW

OpenCode plugin (npm: oh-my-opencode) that extends Claude Code (OpenCode fork) with multi-agent orchestration, 44 lifecycle hooks, 26 tools, skill/command/MCP systems, and Claude Code compatibility. 1158 TypeScript files, 133k LOC.

STRUCTURE

oh-my-opencode/
├── src/
│   ├── index.ts              # Plugin entry: loadConfig → createManagers → createTools → createHooks → createPluginInterface
│   ├── plugin-config.ts      # JSONC multi-level config: user → project → defaults (Zod v4)
│   ├── agents/               # 11 agents (Sisyphus, Hephaestus, Oracle, Librarian, Explore, Atlas, Prometheus, Metis, Momus, Multimodal-Looker, Sisyphus-Junior)
│   ├── hooks/                # 44 hooks across 39 directories + 6 standalone files
│   ├── tools/                # 26 tools across 15 directories
│   ├── features/             # 19 feature modules (background-agent, skill-loader, tmux, MCP-OAuth, etc.)
│   ├── shared/               # 101 utility files in 13 categories
│   ├── config/               # Zod v4 schema system (22 files)
│   ├── cli/                  # CLI: install, run, doctor, mcp-oauth (Commander.js)
│   ├── mcp/                  # 3 built-in remote MCPs (websearch, context7, grep_app)
│   ├── plugin/               # 8 OpenCode hook handlers + 44 hook composition
│   └── plugin-handlers/      # 6-phase config loading pipeline
├── packages/                 # Monorepo: comment-checker, opencode-sdk
└── local-ignore/             # Dev-only test fixtures

INITIALIZATION FLOW

OhMyOpenCodePlugin(ctx)
  ├─→ loadPluginConfig()         # JSONC parse → project/user merge → Zod validate → migrate
  ├─→ createManagers()           # TmuxSessionManager, BackgroundManager, SkillMcpManager, ConfigHandler
  ├─→ createTools()              # SkillContext + AvailableCategories + ToolRegistry (26 tools)
  ├─→ createHooks()              # 3-tier: Core(35) + Continuation(7) + Skill(2) = 44 hooks
  └─→ createPluginInterface()    # 8 OpenCode hook handlers → PluginInterface

8 OPENCODE HOOK HANDLERS

Handler	Purpose
config	6-phase: provider → plugin-components → agents → tools → MCPs → commands
tool	26 registered tools
chat.message	First-message variant, session setup, keyword detection
chat.params	Anthropic effort level adjustment
event	Session lifecycle (created, deleted, idle, error)
tool.execute.before	Pre-tool hooks (file guard, label truncator, rules injector)
tool.execute.after	Post-tool hooks (output truncation, metadata store)
experimental.chat.messages.transform	Context injection, thinking block validation

WHERE TO LOOK

Task	Location	Notes
Add new agent	src/agents/ + src/agents/builtin-agents/	Follow createXXXAgent factory pattern
Add new hook	src/hooks/{name}/ + register in src/plugin/hooks/create-*-hooks.ts	Match event type to tier
Add new tool	src/tools/{name}/ + register in src/plugin/tool-registry.ts	Follow createXXXTool factory
Add new feature module	src/features/{name}/	Standalone module, wire in plugin/
Add new MCP	src/mcp/ + register in createBuiltinMcps()	Remote HTTP only
Add new skill	src/features/builtin-skills/skills/	Implement BuiltinSkill interface
Add new command	src/features/builtin-commands/	Template in templates/
Add new CLI command	src/cli/cli-program.ts	Commander.js subcommand
Add new doctor check	src/cli/doctor/checks/	Register in checks/index.ts
Modify config schema	src/config/schema/ + update root schema	Zod v4, add to OhMyOpenCodeConfigSchema

MULTI-LEVEL CONFIG

Project (.opencode/oh-my-opencode.jsonc)  →  User (~/.config/opencode/oh-my-opencode.jsonc)  →  Defaults

Fields: agents (14 overridable), categories (8 built-in + custom), disabled_* arrays, 19 feature-specific configs.

THREE-TIER MCP SYSTEM

Tier	Source	Mechanism
Built-in	src/mcp/	3 remote HTTP: websearch (Exa/Tavily), context7, grep_app
Claude Code	.mcp.json	${VAR} env expansion via claude-code-mcp-loader
Skill-embedded	SKILL.md YAML	Managed by SkillMcpManager (stdio + HTTP)

CONVENTIONS

• Test pattern: Vitest, co-located *.test.ts, given/when/then style
• Factory pattern: createXXX() for all tools, hooks, agents
• Hook tiers: Session (22) → Tool-Guard (9) → Transform (4) → Continuation (7) → Skill (2)
• Agent modes: primary (respects UI model) vs subagent (own fallback chain) vs all
• Model resolution: 3-step: override → category-default → provider-fallback → system-default
• Config format: JSONC with comments, Zod v4 validation, snake_case keys

ANTI-PATTERNS

• Never use as any, @ts-ignore, @ts-expect-error
• Never suppress lint/type errors
• Never add emojis to code/comments unless user explicitly asks
• Never commit unless explicitly requested
• Test: given/when/then — never use Arrange-Act-Assert comments
• Comments: avoid AI-generated comment patterns (enforced by comment-checker hook)

COMMANDS

bun test                    # Vitest test suite
bun run build              # Build plugin
bunx oh-my-opencode install # Interactive setup
bunx oh-my-opencode doctor  # Health diagnostics
bunx oh-my-opencode run     # Non-interactive session

NOTES

• Logger writes to /tmp/oh-my-opencode.log — check there for debugging
• Background tasks: 5 concurrent per model/provider (configurable)
• Plugin load timeout: 10s for Claude Code plugins
• Model fallback priority: Claude > OpenAI > Gemini > Copilot > OpenCode Zen > Z.ai > Kimi
• Config migration runs automatically on legacy keys (agent names, hook names, model versions)