required

name	required
description	Use when starting any compiler task or session before touching parser/analyze/transform/ast/codegen/css/diagnostics code, before proposing a design or writing code, and when the task grows into a new layer and you need its PRD invariants.
allowed-tools	Read, Bash

required

Read before touching the compiler: the PRDs your task touches land in context by matching the topics: contract, never by judging a filename.

context.md is the glossary — your routing vocabulary. map.md indexes the code. Each PRD's topics: line lists the canonical glossary terms it owns.

1. Read context.md and map.md in full — the vocabulary the rest of this runs on.
2. Name your task's terms in glossary vocabulary. Unsure of the canonical term? Map through the term's _Avoid_ synonyms.
3. Match each term against topics:, not filenames. grep -il "^topics:.*<stem>" docs/*.md — grep the bare stem (derived, each, bind), never the punctuated form ($derived, {#each}). Over-matching is free; a missed match is the failure. A term that matches no PRD is a routing gap — say so.
4. Read every matched PRD in full, then list them. Skipping a match is a stated decision, never a silent default.
5. Re-match when the task grows. New term in scope → grep again → read the new match.