tsz-architecture - SKILL.md Agent Skill

name: tsz-architecture description: Preserve TSZ architecture boundaries while changing checker, solver, binder, emitter, LSP, WASM, or CLI code. Use when planning semantic fixes, moving logic across query boundaries, handling architecture guard failures, ratcheting boundary debt, or reviewing changes for solver-first and no hardcoding rules.

Use for ownership-boundary work. Default direction: solver-first semantics, thin checker, syntax parser, symbol/flow binder, output-only emitter.

Read AGENTS.md and docs/plan/ROADMAP.md for conformance, emit, performance, architecture, LSP/WASM, Sound Mode, or DRY cleanup work.
Inspect overlapping PRs/issues.
State: When <structural condition>, tsc does X; tsz does X through <owner>.
No fixture paths, user names, source snippets, rendered strings, or single test names as decision inputs.
Prefer one query/boundary helper over local checker branches.

Scanner: tokens and interning.
Parser: syntax-only AST.
Binder: symbols, scopes, hoisting, flow graph.
Solver: relations, evaluation, inference, instantiation, operations, narrowing, semantic caches.
Checker: orchestration, diagnostics, source spans.
Emitter: JS/DTS output and transform scheduling.
LSP/WASM/CLI: API consumers.

Classify as WHAT (solver/query boundary) or WHERE (checker location/ diagnostic orchestration).
Search existing boundaries: rg "struct .*Request|RelationRequest|query_boundaries|TypeData" crates/tsz-checker/src crates/tsz-solver/src
Put checker-facing semantic adapters under crates/tsz-checker/src/query_boundaries/.
Avoid new checker TypeKey matching, direct CompatChecker, raw interning, or type-shape recursion.
Add owning-crate tests and adjacent cases varying names/wrappers.

python3 scripts/arch/arch_guard.py
scripts/arch/check-checker-boundaries.sh
python3 scripts/arch/test_arch_guard.py

Use targeted cargo nextest run; wrap heavy runs with scripts/safe-run.sh.

PR notes: structural rule, owner layer, adjacent matrix, guard/tests, temporary debt/removal condition.