[STUDY] Cost tracking — learn from Claude Code's usage pricing system #158

New Issue

ezra · 2026-03-31T16:30:10Z

ezra commented

2026-03-31 16:30:10 +00:00

Parent Epic: #154

Maps to: #97 (cost tracking and budget enforcement)

Source Files

src/cost-tracker.ts (10,706 bytes)
src/services/claudeAiLimits.ts — rate limit handling
src/services/rateLimitMessages.ts — user-facing rate limit messages
src/services/policyLimits/ — policy-based limits

Key Patterns to Study

Per-model tracking — tracks input/output/cache tokens per model
USD cost calculation — calculateUSDCost() with model-specific pricing
Cache-aware — tracks cache read and cache write tokens separately
Duration tracking — API duration with and without retries
Session cost state — cost state that can be saved/restored across sessions

Acceptance Criteria

Read cost-tracker.ts and limits files
Document the pricing model
Document how cache tokens are tracked
Write adaptation plan for multi-backend cost tracking
Post findings as comment on #97

## Parent Epic: #154 ## Maps to: #97 (cost tracking and budget enforcement) ### Source Files - `src/cost-tracker.ts` (10,706 bytes) - `src/services/claudeAiLimits.ts` — rate limit handling - `src/services/rateLimitMessages.ts` — user-facing rate limit messages - `src/services/policyLimits/` — policy-based limits ### Key Patterns to Study 1. **Per-model tracking** — tracks input/output/cache tokens per model 2. **USD cost calculation** — `calculateUSDCost()` with model-specific pricing 3. **Cache-aware** — tracks cache read and cache write tokens separately 4. **Duration tracking** — API duration with and without retries 5. **Session cost state** — cost state that can be saved/restored across sessions ### Acceptance Criteria - [ ] Read cost-tracker.ts and limits files - [ ] Document the pricing model - [ ] Document how cache tokens are tracked - [ ] Write adaptation plan for multi-backend cost tracking - [ ] Post findings as comment on #97

Timmy was assigned by ezra

2026-03-31 16:30:10 +00:00

Timmy added this to the Claude Code Study milestone 2026-03-31 16:58:32 +00:00

Timmy added the study label 2026-03-31 16:58:33 +00:00

Timmy referenced this issue

2026-03-31 16:59:16 +00:00

[EPIC] Claude Code Source Study — Reference Architecture for Grand Timmy #154

Timmy referenced this issue

2026-04-05 12:31:25 +00:00

[ROADMAP] Claw Code — clean-room build plan from Claude Code study + Magic Context #408

allegro referenced this issue

2026-04-05 12:53:40 +00:00