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# Implementation Summary

**Session ID**: `phase21-session03-authoritative-claude-usage-oauth` **Completed**: 2026-06-02 **Duration**: 0.4 hours

***

## Overview

This session added an authoritative Claude OAuth usage path to AI OS while preserving the existing estimate-based fallback. The work is script-only, read-only, and null-safe: credential reads, CLI probing, and the Anthropic usage fetch all return `null` on failure, and browser-visible data only receives bounded safe fields.

The session also updated the usage window projection, live-data validation, the usage panel live/estimate affordance, and the aggregate redaction path so OAuth credentials never leak into generated data, logs, or UI state.

***

## Deliverables

### Files Created

| File                                                                                              | Purpose                                                                          | Lines |
| ------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- | ----- |
| `scripts/lib/claude-oauth-usage.ts`                                                               | Script-only Claude OAuth credential reader, CLI detector, and usage fetch helper | \~220 |
| `scripts/lib/__tests__/claude-oauth-usage.test.ts`                                                | OAuth credential, timeout, fetch, and redaction coverage                         | \~240 |
| `.spec_system/specs/phase21-session03-authoritative-claude-usage-oauth/validation.md`             | Validation report for the completed session                                      | \~40  |
| `.spec_system/specs/phase21-session03-authoritative-claude-usage-oauth/IMPLEMENTATION_SUMMARY.md` | Session closeout summary                                                         | \~120 |

### Files Modified

| File                                                    | Changes                                                                                     |
| ------------------------------------------------------- | ------------------------------------------------------------------------------------------- |
| `scripts/lib/usage-assembly.ts`                         | Added authoritative Claude usage projection, source switching, and bounded payload handling |
| `scripts/lib/aggregate-orchestration.ts`                | Wired OAuth usage fetch into aggregate generation with safe fallback                        |
| `scripts/lib/ai-runtime/providers.ts`                   | Extended free-form redaction for Claude OAuth token shapes                                  |
| `src/lib/live-data-types.ts`                            | Added additive Claude usage source, reset, and authoritative fields                         |
| `src/lib/validate-live-data.ts`                         | Validated the additive Claude usage shape while preserving legacy compatibility             |
| `src/data/live-data.example.json`                       | Added safe example data for estimate/live-compatible Claude usage                           |
| `src/components/usage-panel.tsx`                        | Rendered live/estimate badges and reset labels                                              |
| `scripts/lib/__tests__/usage-assembly.test.ts`          | Added source-switching and fallback assertions                                              |
| `scripts/lib/__tests__/aggregate-orchestration.test.ts` | Added authoritative wiring and null fallback coverage                                       |
| `scripts/lib/__tests__/ai-runtime-providers.test.ts`    | Added Claude OAuth redaction regression coverage                                            |
| `src/lib/__tests__/nested-validation.test.ts`           | Added additive validation and legacy compatibility assertions                               |
| `src/components/__tests__/usage-panel.test.tsx`         | Added live badge and reset label assertions                                                 |
| `.spec_system/state.json`                               | Marked Phase 21 complete and recorded session completion                                    |
| `.spec_system/PRD/phase_21/PRD_phase_21.md`             | Updated phase progress to complete                                                          |
| `.spec_system/PRD/PRD.md`                               | Marked Phase 21 complete in the master PRD                                                  |
| `package.json`                                          | Bumped patch version to `0.1.249`                                                           |

***

## Technical Decisions

1. **Script-only OAuth handling**: Credential reads, CLI checks, and remote usage fetches stayed in `scripts/lib/` so no token-bearing data crossed into browser code.
2. **Typed degradation over throws**: Any missing credential, CLI, timeout, parse, or network failure returns `null` and preserves the estimate path.
3. **Additive browser contract**: The usage window and validation layers accept the new live fields without breaking legacy generated data.

***

## Test Results

| Metric           | Value      |
| ---------------- | ---------- |
| Tests            | 221 files  |
| Passed           | 2931 tests |
| Typecheck        | Passed     |
| Script typecheck | Passed     |
| ASCII scan       | Passed     |
| LF scan          | Passed     |

***

## Lessons Learned

1. The authoritative usage endpoint needs strict schema guards because the fallback estimate path must remain the default when payloads drift.
2. Redaction needs to cover token-shaped strings and auth headers explicitly, not just generic secret names.

***

## Future Considerations

1. Revisit the OAuth usage response shape if Anthropic changes the endpoint contract.
2. Keep the usage panel affordance minimal so the live versus estimate distinction stays legible.

***

## Session Statistics

* **Tasks**: 22 completed
* **Files Created**: 4
* **Files Modified**: 16
* **Tests Added**: 4
* **Blockers**: 0 resolved


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