Now-Chess

Scala 3.5.1 · Gradle 9

Commands

./clean      # Clear build dirs — only when necessary
./compile    # Compile all modules — always run
./test       # Run all tests
./coverage   # Check coverage
./lint       # Run linters

Use consistently.

Modules

Module	Role	Depends on
`api`	Model / shared types	(none)
`core`	Primary business logic	api, rule
`rule`	Game rules	api
`bot`	Bots and AI	api,rule,io
`io`	Export formats	api, core
`ui`	Entrypoint & UI	core, io

Style

Immutable data, pure functions.
Functions under 30 lines. Need "and"? Split it.
Cyclomatic complexity under 15.
No comments. Names carry intent. Comment non-obvious algorithms only.
Scan duplicated logic. Extract.
Follow default Sonar style for Scala.
Option/Either for fallible ops. Skip exceptions for control flow.
Naming: types PascalCase, functions/values camelCase.

Code Quality

Coverage: 100% condition coverage required in api, core, rule, io (mandatory); ui exempt.

Linters

scalafmt — Enforces formatting. Check: ./gradlew spotlessScalaCheck. Refactor: ./gradlew spotlessScalaApply.
scalafix — Enforces style, detects unused imports/code. Run: ./gradlew scalafix.

Architecture Decisions

Immutable state as primary model: GameContext (api) holds board, history, player state—immutable throughout. Each move → new GameContext. Enables undo/redo without side effects.
Observer pattern for UI decoupling: GameEngine publishes move/state events; CommandInvoker queues moves; UI listens (no polling). GameEngine never imports UI.
RuleSet trait encapsulates rules: Move generation, check, castling, en passant all in RuleSet impl. GameEngine calls rules as black box; rules don't know rest of core.
Polyglot hash must follow spec index layout: Piece keys use interleaved mapping (pieceType * 2 + colorBit) (black=0, white=1). Castling keys: 768..771. En-passant file keys: 772..779, XORed only if side-to-move has capturable en passant. Side-to-move key: 780 (white).
Alpha-beta uses sequential PV search by default: Parallel split disabled (fixed-window futures removed pruning effectiveness). Sequential PV default. Correctness + pruning quality > speculative parallelism.
Search hash is updated incrementally per move: Bot search updates Zobrist keys from parent hash with move deltas, not recomputing piece scans per node.

Rules

Tests are the spec. Don't modify to pass. Fix requirements/code. Update only if requirements change.
Never read build folders. Ask permission if needed.
Keep file current with decisions + conventions.

Instructions for Claude Code

Two-Step Rule (mandatory)

Step 1 — Orient: Use wiki articles to find WHERE things live. Step 2 — Verify: Read source files from wiki BEFORE coding.

Wiki = structural summaries (routes, models, file locations). No function logic, middleware internals, runtime behavior. Don't code from wiki alone—read sources.

Read in order at session start:

.codesight/wiki/index.md — orientation map (~200 tokens)
.codesight/wiki/overview.md — architecture overview (~500 tokens)
Domain article (e.g. .codesight/wiki/auth.md) → check "Source Files" section → read those files
.codesight/CODESIGHT.md — full context map for deep exploration

[inferred] routes = regex-detected. Verify sources. ⚠ in wiki? Re-run codesight --wiki.

Or use the codesight MCP server for on-demand queries:

codesight_get_wiki_article — read a specific wiki article by name
codesight_get_wiki_index — get the wiki index
codesight_get_summary — quick project overview
codesight_get_routes --prefix /api/users — filtered routes
codesight_get_blast_radius --file src/lib/db.ts — impact analysis before changes
codesight_get_schema --model users — specific model details

Consult codesight context first. Saves ~16.893 tokens/conversation.

graphify

graphify knowledge graph at graphify-out/.

Rules:

Architecture/codebase questions? Read graphify-out/GRAPH_REPORT.md (god nodes, communities).
graphify-out/wiki/index.md exists? Use it (not raw files).
Code modified? Run python3 -c "from graphify.watch import _rebuild_code; from pathlib import Path; _rebuild_code(Path('.'))" to sync graph.

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