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AGENTS.md

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AGENTS.md

Task Completion Requirements

  • Both bun lint and bun typecheck must pass before considering tasks completed.
  • NEVER run bun test. Always use bun run test (runs Vitest).

Project Snapshot

T3 Code is a minimal web GUI for using code agents like Codex and Claude Code (coming soon).

This repository is a VERY EARLY WIP. Proposing sweeping changes that improve long-term maintainability is encouraged.

Core Priorities

  1. Performance first.
  2. Reliability first.
  3. Keep behavior predictable under load and during failures (session restarts, reconnects, partial streams).

If a tradeoff is required, choose correctness and robustness over short-term convenience.

Maintainability

Long term maintainability is a core priority. If you add new functionality, first check if there are shared logic that can be extracted to a separate module. Duplicate logic across mulitple files is a code smell and should be avoided. Don't be afraid to change existing code. Don't take shortcuts by just adding local logic to solve a problem.

Package Roles

  • apps/server: Node.js WebSocket server. Wraps Codex app-server (JSON-RPC over stdio), serves the React web app, and manages provider sessions.
  • apps/web: React/Vite UI. Owns session UX, conversation/event rendering, and client-side state. Connects to the server via WebSocket.
  • packages/contracts: Shared effect/Schema schemas and TypeScript contracts for provider events, WebSocket protocol, and model/session types. Keep this package schema-only — no runtime logic.
  • packages/shared: Shared runtime utilities consumed by both server and web. Uses explicit subpath exports (e.g. @t3tools/shared/git) — no barrel index.

Codex App Server (Important)

T3 Code is currently Codex-first. The server starts codex app-server (JSON-RPC over stdio) per provider session, then streams structured events to the browser through WebSocket push messages.

How we use it in this codebase:

  • Session startup/resume and turn lifecycle are brokered in apps/server/src/codexAppServerManager.ts.
  • Provider dispatch and thread event logging are coordinated in apps/server/src/providerManager.ts.
  • WebSocket server routes NativeApi methods in apps/server/src/wsServer.ts.
  • Web app consumes orchestration domain events via WebSocket push on channel orchestration.domainEvent (provider runtime activity is projected into orchestration events server-side).

Docs:

Reference Repos

Use these as implementation references when designing protocol handling, UX flows, and operational safeguards.