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Port OCP server.mjs:842-1109 plan-usage probe to lib/providers/anthropic.mjs:quotaStatus(). ## Authority citations (CLAUDE.md hard requirement #1) 1. Schema pin: ~/.cc-rules/memory/learnings/anthropic_plan_usage_probe_schema_2026_05_26.md — 13-field canonical schema verified live 2026-05-26; 3 fields new vs OCP 2026-04 capture (5h-status, 7d-status, overage-reset). 2. OCP port source: OCP server.mjs:842-1109 — usageCache, oauthRefreshBackoff, getOAuthCredentials, refreshOAuthToken, fetchUsageFromApi, parseRateLimitHeaders. Claude Code CLI uses this same POST /v1/messages internally (verified 2026-05-26 by `strings` on @anthropic-ai/claude-code v2.1.142 / v2.1.150 Mach-O binary — see audit memory). This is observed CLI behaviour, not invention. 3. ADR 0002 Amendment 8 — READ-ONLY exemption for quotaStatus() direct-API access. Three constraints satisfied: READ-ONLY (max_tokens:1, body discarded), subscription-scope (same readAuthArtifact() creds as spawn path), idempotent-failure (returns null / stale on any error, never throws). 4. ADR 0013 — OAuth READ-ONLY consumption rules. All 7 rules satisfied: Rule 1: credential reuse via readAuthArtifact() (env → .credentials.json → keychain). Rule 2: only POST /v1/messages (no other endpoints). Body discarded; headers-only. Rule 3: 5min TTL cache; 60s–3600s exponential backoff; stale-on-failure. Rule 4: opt-in via ~/.olp/config.json providers.anthropic.quota_probe_enabled (default false). Rule 5: schema pin committed to memory file; drift detection protocol in place. Rule 6: doctor check anthropic.quota_probe_reachable surfaces probe status. Rule 7: does not govern spawn-path refresh (separate concern). 5. ADR 0012 D80 — Phase 5 charter: this commit is the D80 deliverable. ## Live probe transcript (2026-05-26 from MacBook keychain OAuth credentials) Path B verification per ADR 0013 Rule 5: curl -s -i -m 20 -X POST https://api.anthropic.com/v1/messages \ -H "Authorization: Bearer <token>" \ -H "anthropic-beta: oauth-2025-04-20" \ -H "anthropic-version: 2023-06-01" \ -H "Content-Type: application/json" \ -d '{"model":"claude-haiku-4-5-20251001","max_tokens":1,"messages":[{"role":"user","content":"."}]}' Response (header lines only): HTTP/2 200 anthropic-ratelimit-unified-status: allowed anthropic-ratelimit-unified-5h-status: allowed anthropic-ratelimit-unified-5h-reset: 1779794400 anthropic-ratelimit-unified-5h-utilization: 0.09 anthropic-ratelimit-unified-7d-status: allowed anthropic-ratelimit-unified-7d-reset: 1780225200 anthropic-ratelimit-unified-7d-utilization: 0.32 anthropic-ratelimit-unified-representative-claim: five_hour anthropic-ratelimit-unified-fallback-percentage: 0.5 anthropic-ratelimit-unified-reset: 1779794400 anthropic-ratelimit-unified-overage-disabled-reason: org_level_disabled_until anthropic-ratelimit-unified-overage-status: rejected (no anthropic-ratelimit-unified-overage-reset — expected: only present on active overage) 12/13 fields present. overage-reset absent = no active overage (expected per audit memory). All fields parsed correctly by _parseRateLimitHeaders(). Confirmed via D80 smoke test. ## Implementation A. quotaStatus() — full probe implementation replacing D4 null stub: - _readProviderConfig('anthropic') gate (Rule 4 opt-in) - 5min module-level cache check (quotaProbeState.cache) - 60s–3600s exponential backoff check (quotaProbeState.backoffUntil / backoffMs) - readAuthArtifact() credential read (env → .credentials.json → macOS keychain) - _probeOnce() → POST /v1/messages with 4 required headers; body discarded - 401/403 → single refresh-and-retry via _refreshAccessToken() - On success: cache { fetchedAt, data } + reset backoff to MIN - On failure: _scheduleBackoff() (doubles backoffMs, caps at MAX) + return stale or null - Return shape: { probedAt, source, schemaVersion, stale, fields:{...13}, raw:{...} } B. _parseRateLimitHeaders() — all 13 fields (3 new vs OCP): - status, representative_claim, reset, fallback_percentage (aggregate) - status_5h, utilization_5h, reset_5h (5h window) - status_7d, utilization_7d, reset_7d (7d window) - overage_status, overage_disabled_reason, overage_reset (overage) - Numeric strings → numbers; missing fields → null (not 0 or "unknown") C. _refreshAccessToken() — uses Node.js built-in https (no fetch/3rd-party deps). Shared backoff state via quotaProbeState. Max one refresh per backoff window. D. _probeOnce() — uses Node.js built-in https. 15s timeout. Drains + discards body. E. _readProviderConfig() — reads ~/.olp/config.json providers.<name> block. OLP_HOME respected (same as lib/keys.mjs). Never throws; returns {} on error. F. doctorChecks() — new anthropic.quota_probe_reachable check (ADR 0013 Rule 6): - status: ok when probe disabled (returns advisory message) - status: ok when probe succeeds (shows utilization %) - status: warn when stale cache exists (probe failed but cache present) - status: fail when no cache + probe failed (fix_commands + human_steps recipe) G. docs/v1x-roadmap.md — #8 Dashboard enrichment entry (D79 follow-up) added. ## Tests - All 720 existing tests pass (npm test). - Suite 33j updated to include anthropic.quota_probe_reachable in the expected probe set (3 probes total, previously 2). - D83 (Suite 38) will add quota-probe unit tests with mock HTTP server. ## What NOT changed - dashboard.html — untouched (D82) - lib/audit-query.mjs — untouched (D81) - lib/providers/codex.mjs, mistral.mjs — untouched (D84 NO-GO per ADR 0012 Amendment 1) Co-authored-by: dtzp555 <dtzp555@gmail.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>