---
phase: 31-puter.js-zero-config-cloud
plan: "01"
subsystem: server
tags: [puter, proxy, sse, streaming, cost-tracking, secrets]
dependency_graph:
  requires: []
  provides: [puterProxyService, puterProxyRoutes]
  affects: [server/src/app.ts]
tech_stack:
  added: []
  patterns: [SSE streaming, AsyncGenerator, secretService token storage, conditional cost recording]
key_files:
  created:
    - server/src/services/puter-proxy.ts
    - server/src/routes/puter-proxy.ts
    - server/src/__tests__/31-puter-proxy.test.ts
  modified:
    - server/src/app.ts
decisions:
  - "agentId is optional in chatStream — cost recording skipped when null/undefined to avoid FK violation in cost_events"
  - "PUTER_DEFAULT_MODEL set to claude-3-5-haiku-20241022 matching Puter's OpenAI-compat endpoint"
  - "Non-blocking cost recording via .catch(() => {}) pattern — stream completes regardless of cost event persistence"
metrics:
  duration: 4m
  completed: 2026-04-03
  tasks_completed: 2
  files_changed: 4
requirements: [CLOUD-01, CLOUD-02]
---

# Phase 31 Plan 01: Puter Proxy Service + Routes Summary

JWT auth with Puter token stored via secretService and relayed as Bearer header to Puter's OpenAI-compatible SSE endpoint with conditional cost tracking.

## What Was Built

**`server/src/services/puter-proxy.ts`** — `puterProxyService(db)` factory with:
- `storeToken(companyId, token)`: create-or-rotate idempotent token storage via `secretService` with name `puter_auth_token`, provider `local_encrypted`
- `resolveToken(companyId)`: retrieves and resolves latest secret version; throws `unprocessable` if not configured
- `chatStream(companyId, agentId, messages, model, signal)`: AsyncGenerator that POSTs to `https://api.puter.com/puterai/openai/v1/chat/completions` with `stream: true` and `stream_options: { include_usage: true }`, parses SSE lines, yields content tokens, records cost event (only when agentId is truthy)

**`server/src/routes/puter-proxy.ts`** — `puterProxyRoutes(db)` Express Router with:
- `POST /puter-proxy/token` — board auth, stores token, returns `{ ok: true }`
- `POST /puter-proxy/chat` — board auth, SSE headers, streams tokens as `data: { token: "..." }`, sends `data: { done: true }` on completion

**`server/src/app.ts`** — import and mount `api.use(puterProxyRoutes(db))` after `costRoutes`, inside boardMutationGuard.

**`server/src/__tests__/31-puter-proxy.test.ts`** — 10 vitest tests covering all behaviors (token create/rotate, token resolve, Puter fetch headers, SSE yielding, cost recording with agentId, cost skip without agentId, route 200/SSE/optional-agentId).

## Verification

- All 10 tests passing: `npx vitest run src/__tests__/31-puter-proxy.test.ts`
- All 14 acceptance criteria pass (grep checks)
- New files produce zero TypeScript errors (pre-existing plugin-sdk errors unrelated to this plan)

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Test 4 mock missing return value for createEvent**
- **Found during:** GREEN phase test run — Test 4 passed agentId="agent-1" triggering cost recording but mockCreateEvent had no configured return (returns undefined after vi.clearAllMocks)
- **Fix:** Added `mockCreateEvent.mockResolvedValue({ id: "ev-1" })` to Test 4 setup
- **Files modified:** server/src/__tests__/31-puter-proxy.test.ts
- **Commit:** 13bc39b1

## Known Stubs

None — all data paths are wired. The Puter token is resolved from secretService on every call (no stub).

## Self-Check: PASSED
