moshi-hook 0.1.6 returns stale `capturedAt` — Anthropic /api/oauth/usage requires new `anthropic-beta` header

[appvoraFR]

Symptom

The Moshi mobile app's "Utilisation" tab shows Claude Max usage data that hasn't updated for 18+ hours, even though the daemon reports usage poller: synced count=1 every poll cycle and Claude Code is being actively used.

moshi-hook usage consistently returns the same capturedAt timestamp from a previous successful poll, regardless of how recently the daemon ran.

Reproduction

$ moshi-hook version
moshi-hook 0.1.6

$ moshi-hook usage
[
  {
    "accountId": "claude:73dd89e1aa7c",
    "accountLabel": "Max 5x",
    "agent": "claude-code",
    "hostName": "ov-214601",
    "capturedAt": "2026-05-03T15:01:43.006526991+02:00",
    "windows": [
      { "label": "5h", "usedPercentage": 0, "resetsAt": "2026-05-04T07:10:00Z" },
      { "label": "7d", "usedPercentage": 8, "resetsAt": "2026-05-10T06:00:00Z" }
    ]
  }
]

capturedAt is from May 3, 15:01 — never refreshes despite the daemon running and the OAuth token being valid (Claude Code itself works fine).

Root cause

Anthropic's /api/oauth/usage endpoint now requires the beta header anthropic-beta: oauth-2025-04-20. Without it, the endpoint returns 401:

$ TOKEN="$(jq -r .claudeAiOauth.accessToken ~/.claude/.credentials.json)"

# Without the beta header → 401:
$ curl -i -H "Authorization: Bearer $TOKEN" https://api.anthropic.com/api/oauth/usage
HTTP/1.1 401 Unauthorized
{"type":"error","error":{"type":"authentication_error",
 "message":"OAuth authentication is currently not supported."}}

# With anthropic-beta: oauth-2025-04-20 → 200:
$ curl -H "Authorization: Bearer $TOKEN"        -H "anthropic-beta: oauth-2025-04-20"        https://api.anthropic.com/api/oauth/usage
{
  "five_hour":  {"utilization": 8.0,  "resets_at": "2026-05-04T09:49:59.888578+00:00"},
  "seven_day":  {"utilization": 15.0, "resets_at": "2026-05-10T06:00:00.888597+00:00"},
  "seven_day_oauth_apps": null,
  "seven_day_opus": null,
  "seven_day_sonnet":  {"utilization": 0.0, "resets_at": null},
  "seven_day_omelette":{"utilization": 0.0, "resets_at": null},
  ...
}

So moshi-hook likely calls /api/oauth/usage with a different (older?) anthropic-beta value, gets a silent 401, then falls back to the last successfully cached snapshot.

Suggested fix

Update the anthropic-beta request header used in internal/usage/claude_poll.go (or wherever the OAuth usage call lives) to include oauth-2025-04-20.

If multiple beta features are needed, the API accepts a comma-separated list, e.g. anthropic-beta: oauth-2025-04-20,<other>.

It would also be helpful if a 401 from this endpoint either:

• logged a clear error at WARN/ERROR (currently the daemon log just says usage poller: synced count=1), or
• bumped capturedAt to the actual poll time so the UI surfaces "stale data, last successful sync at X".

Environment

• moshi-hook 0.1.6 (Linux x86_64, installed from https://cdn.getmoshi.app/hook/v0.1.6/moshi-hook_Linux_x86_64.tar.gz, sha256 verified)
• Claude Code 2.1.126
• Linux 6.12.85+deb13-amd64
• Account plan: Max 5x

Workaround

None local — the anthropic-beta header is hard-coded in the binary. Either patch the binary or wait for an upstream release.