review · segments
Pi source integration: architecture review, refactor, and documentation
pi 360 events 7 segments
segment 1 of 7
Review CREAM architecture for Pi source integration
Read cream.py, tests, fixtures, and macOS app code to understand how Claude and Codex sources are wired. Discovered that provider is conflated with source (Claude=Anthropic, Codex=OpenAI) and that Pi is a multi-provider harness with 98 real session files on disk.
outcome
Full understanding of the 2523-line cream.py architecture: PROVIDERS tuple, per-source loaders, SessionAccumulator, cache inference strategies, and the source/provider conflation.
next steps
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key decisions
- Pi session files exist at ~/.pi/agent/sessions/--<cwd>--/*.jsonl with 98 files across multiple providers (cursor, openrouter, etc.)
- Pi's per-turn provider field is the model provider, not the harness — this breaks the current source=provider assumption
open questions
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2 weeks ago → 2 weeks ago
segment 2 of 7
Analyze Pi session structure and compare to OpenRouter API data
Examined real Pi session files to understand the JSONL format, entry types (session header, model_change, thinking_level_change, message with user/assistant/toolResult/bashExecution roles), and usage fields. Compared Pi's recorded data against OpenRouter's Generation Data raw JSON for the same request (gen-1781862879), finding that Pi faithfully records native token counts, cost, and cacheRead/cacheWrite but does NOT record the upstream inference provider name (e.g. 'Wafer') or reasoning tokens.
outcome
Verified that Pi's responseId matches OpenRouter's generation_id (joinable), Pi records native tokens not billing tokens, but upstream provider reroutes within OpenRouter are invisible locally.
next steps
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key decisions
- Pi's provider field is always 'openrouter' for OpenRouter-routed models — sub-provider reroutes are undetectable from local data
- Pi's usage.input/output/cacheRead/cacheWrite/cost.total match OpenRouter's native_tokens_*/usage exactly
- responseId == generation_id provides a join key for future OpenRouter API enrichment
open questions
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2 weeks ago → 2 weeks ago
segment 3 of 7
Codify decisions and scope plan in CURRENT-TASK.md
Wrote CURRENT-TASK.md capturing all decisions: split source from provider in JSON contract, cache-strategy resolver keyed on provider, OpenRouter handling via empirical_dropoff with reroute-caveat note, light module split into providers/* and cache_strategies.py, and a 4-phase plan (Phase 0: contract split, Phase 1: resolver, Phase 2: Pi adapter, Phase 3: docs). Later updated to add Phase 4 (cost tracking) and Phase 5 (OpenRouter API enrichment) based on user direction.
outcome
CURRENT-TASK.md written with locked decisions, non-goals, phase plan, verification commands, and open items.
next steps
- Begin Phase 0: split cream.py into shared core + providers/{claude,codex}.py + cache_strategies.py with zero behavior change
key decisions
- Split source from provider in JSON contract — add source field, redefine provider as model provider
- Cache strategy resolver keyed on provider (anthropic_ephemeral, empirical_dropoff, unknown)
- OpenRouter: use empirical_dropoff where enough samples exist, else unknown, always carry reroute-caveat note
- Light module split: cream.py → shared core + CLI + registries; providers/{claude,codex,pi}.py; cache_strategies.py
- Cost fields added in Phase 1 (cheap, already touching UsageRecord), UI surfacing in Phase 4
- OpenRouter API enrichment is Phase 5 — separate design pass before implementation
open questions
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2 weeks ago → 2 weeks ago
segment 4 of 7
Refactor cream.py into package and add source field
The assistant split the 2523-line cream.py into a cream/ package with core.py, cache_strategies.py, cli.py, and providers/claude.py and providers/codex.py, keeping cream.py as a thin shim. Added a `source` field to SessionSummary, bumped scan cache version to 2, and updated tests. Verified byte-identical output (ignoring new source field) and that all tests pass under both venv and /usr/bin/python3 3.9.6.
outcome
The codebase is now modular with a package structure, and the `source` field is present in the JSON output.
next steps
- Proceed to Phase 1: implement cache strategy dispatch (resolve(provider, model))
- Proceed to Phase 2: add Pi support including provider reassignment and app updates
key decisions
- Deferred provider value reassignment (claude→anthropic, codex→openai) to Phase 2 to avoid regressing the macOS app's colors, subtitles, and diagnostic text
- Kept cream.py as a thin shim so the macOS app's python3 cream.py invocation continues to work
- Bumped SCAN_CACHE_VERSION to 2 and changed default path to scan-cache-v2.json to invalidate old cache entries lacking source
open questions
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2 weeks ago → 2 weeks ago
segment 5 of 7
Verify Phase 0 byte-identical output and confirm no regression
Investigated a reported difference between before/after JSON output. Found that after removing the new `source` field from sessions, the only remaining differences were the expected scan-cache path bump (v1→v2) and the clock-based `as_of` timestamp. Confirmed sessions are byte-identical and diagnostics only differ in the cache path. Ran final lint checks (all modules import clean) and tests (9/9 pass). Marked Phase 0 complete in CURRENT-TASK.md.
outcome
Phase 0 verified complete: monolith split into cream/ package, source field added, scan-cache version bumped, all tests pass, output byte-identical modulo intended changes.
next steps
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key decisions
- The scan-cache path difference (v1→v2) is an expected, intentional change, not a regression.
- Phase 0 is complete and verified; no further work needed on it.
open questions
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2 weeks ago → 2 weeks ago
segment 6 of 7
Document Phase 1 exit criteria and add session handoff section to CURRENT-TASK.md
Added the missing 'Exit criteria' line to Phase 1 in CURRENT-TASK.md, specifying the dispatch routing, cost fields, synthetic test, and build verification. Also added a 'Session handoff' section at the top of the file to orient a new session: what's done (Phase 0), what's next (Phase 1), key decisions, code layout, and verification commands.
outcome
CURRENT-TASK.md now has Phase 1 exit criteria and a handoff section for a new session to pick up the work.
next steps
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key decisions
- Phase 1 exit criteria include: resolve(provider, model) dispatch, model_usage keyed by provider, cost fields in to_json, synthetic test proving provider-keyed strategy, existing tests green, swift build clean.
open questions
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2 weeks ago → 2 weeks ago
segment 7 of 7
Update CLAUDE.md/AGENTS.md for current project state
Updated CLAUDE.md (and AGENTS.md via symlink) to reflect the current state: package structure, source field in contract, scan-cache v2, Pi support in progress, and deferred provider reassignment. Updated the tagline, Project Shape, Working Rules (read-only scope, contract extension), and added a Current Notes section with concrete facts about the source field and scan-cache version. Verified symlink consistency, tests pass, and swift build clean.
outcome
CLAUDE.md and AGENTS.md now accurately describe the current codebase state and in-flight refactor, with pointers to CURRENT-TASK.md for details.
next steps
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key decisions
- docs/CURRENT_STATE.md is intentionally left stale; its full rewrite is Phase 3's job.
- The provider reassignment (claude→anthropic, codex→openai) is deferred to Phase 2, as documented.
open questions
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2 weeks ago → 2 weeks ago