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Phase 0 of the Dynamic Context Management epic (#1671): the ADR (documentation) plus a non-shipping reference example under examples/dynamic-context-management/ — the Option-E predicate fact-store parser/selector, a self-contained --check/--write/--select index generator, a sample index, and a runnable demo. The example is intentionally excluded from the build (src/->bin/lib/), the npm package files[], the installer, and the CI test suite (tests/) — nothing here is compiled into or installed with GSD. Production implementation lands in a later phase. Resolves #1672 Refs #1671 Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Dynamic context management — Option-E reference example
Reference example for ADR-1671, "Dynamic context management platform."
This is a non-shipping reference example. It lives outside the build (
src/→bin/lib/), the npm packagefiles[], the installer, and the CI test suite (tests/). Nothing here is compiled into or installed with GSD. The production implementation lands in a later phase of the Dynamic Context Management epic (#1671).
What it demonstrates
The predicate fact-store → JIT selector slice of the platform: parse the
repo-root CONTEXT.md CLASS.subkey=value predicates into structured records,
drift-guard a generated index, and select the relevant predicate subset for a
task — the building block for just-in-time agent-brief assembly instead of
hand-citing a 200 KB file.
Files
context-predicates.cjs— parser + selector + deterministic index builder (self-contained).gen-context-index.cjs—--check/--writedrift-guarded generator +--select.CONTEXT-INDEX.json— sample generated output (393 predicates, 18 classes).demo.cjs— runnable usage example.
Run (from the repo root)
node examples/dynamic-context-management/demo.cjs
node examples/dynamic-context-management/gen-context-index.cjs --select PRED.k320
node examples/dynamic-context-management/gen-context-index.cjs --check
Validation
During research this slice was validated with 42 behavioral tests — predicate
forms, fenced-code / prose skipping, duplicate-id detection, the selector, a
deterministic index, and a fast-check property test. Those return as CI tests
under tests/ when the production implementation lands.
It also surfaced 3 latent duplicate predicate IDs in CONTEXT.md
(RULESET.WORKFLOW_MARKDOWN.FENCES, RULESET.GEMINI.TOOLS.ask_user,
RULESET.GEMINI.TEST_SENTINEL), recorded in the index duplicates field.