---
title: Runbook — AUTH_TOKEN_MISSING (인증 토큰 누락)
category: AUTH
error_codes: [AUTH_TOKEN_MISSING, AUTHENTICATION_REQUIRED]
severity: P3
owner: oncall
last_updated: 2026-08-18
status: stub
---

# Runbook: AUTH_TOKEN_MISSING (`runbook://auth/token-missing`)

## Symptoms

- HTTP 401 responses with `error.code=AUTH_TOKEN_MISSING`
- Client missing Authorization header or Bearer token
- Tech Log Studio (`studio-v1.yaml`) surfaces the same missing-authentication scenario as
  `error.code=AUTHENTICATION_REQUIRED` — same root cause, Studio-scoped code
  (feature-techlog-studio-backend, `StudioError.AUTHENTICATION_REQUIRED`)

## Diagnosis

- Check request logs for missing Authorization header
- Verify client SDK configuration

## Action

- Confirm API clients are sending Authorization header
- Check gateway/proxy configuration for header stripping

## Escalation

- Escalate if widespread or affecting critical workflows

---

> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)