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feat: preamble emits gbrain-availability block when capability ok

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Extends generate-brain-sync-block.ts to emit Variant A (steady-state, 4
lines) when cwd page_count > 0 or Variant B (empty-corpus emergency, 3
lines) when 0; empty string otherwise. Reads cached page_count from
.gbrain-sync-state.json (handles pretty + compact JSON). Refreshes ship
golden fixtures and bumps the plan-review preamble byte budget to 35K
to absorb the new block.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-05-03 20:42:42 -07:00
parent 51482b0d81
commit f5f79a4982
5 changed files with 126 additions and 5 deletions
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32
scripts/resolvers/preamble/generate-brain-sync-block.ts
View File

@@ -2,6 +2,9 @@
* gbrain-sync preamble block.
*
* Emits bash that runs at every skill invocation:
* 0. Live gbrain-availability hint (per /plan-eng-review): when gbrain is
* configured, emit one of two variants (steady-state vs empty-corpus
* emergency). Zero context cost when gbrain is not configured.
* 1. If ~/.gstack-brain-remote.txt exists AND ~/.gstack/.git is missing,
* surface a restore-available hint (does NOT auto-run restore).
* 2. If sync is on, run `gstack-brain-sync --once` (drain + push).
@@ -31,6 +34,35 @@ _BRAIN_REMOTE_FILE="$HOME/.gstack-brain-remote.txt"
_BRAIN_SYNC_BIN="${ctx.paths.binDir}/gstack-brain-sync"
_BRAIN_CONFIG_BIN="${ctx.paths.binDir}/gstack-config"
# /sync-gbrain context-load: teach the agent to use gbrain when it's available.
# Mutually exclusive variants per /plan-eng-review §4. Empty string when gbrain
# is not configured (zero context cost for non-gbrain users).
_GBRAIN_CONFIG="$HOME/.gbrain/config.json"
if [ -f "$_GBRAIN_CONFIG" ] && command -v gbrain >/dev/null 2>&1; then
_GBRAIN_VERSION_OK=$(gbrain --version 2>/dev/null | grep -c '^gbrain ' || echo 0)
if [ "$_GBRAIN_VERSION_OK" -gt 0 ] 2>/dev/null; then
_SYNC_STATE="$_GSTACK_HOME/.gbrain-sync-state.json"
_CWD_PAGES=0
if [ -f "$_SYNC_STATE" ]; then
# Flatten newlines so the regex works against pretty-printed JSON too.
_CWD_PAGES=$(tr -d '\\n' < "$_SYNC_STATE" 2>/dev/null \\
| grep -o '"name": *"code"[^}]*"detail": *{[^}]*"page_count": *[0-9]*' \\
| grep -o '"page_count": *[0-9]*' | grep -o '[0-9]\\+' | head -1)
_CWD_PAGES=\${_CWD_PAGES:-0}
fi
if [ "$_CWD_PAGES" -gt 0 ] 2>/dev/null; then
echo "GBrain configured. Prefer \\\`gbrain search\\\`/\\\`gbrain query\\\` over Grep for"
echo "semantic questions; use \\\`gbrain code-def\\\`/\\\`code-refs\\\`/\\\`code-callers\\\` for"
echo "symbol-aware code lookup. See \\"## GBrain Search Guidance\\" in CLAUDE.md."
echo "Run /sync-gbrain to refresh."
else
echo "GBrain configured but this repo isn't indexed yet. Run \\\`/sync-gbrain --full\\\`"
echo "before relying on \\\`gbrain search\\\` for code questions in this repo."
echo "Falls back to Grep until indexed."
fi
fi
fi
_BRAIN_SYNC_MODE=$("$_BRAIN_CONFIG_BIN" get gbrain_sync_mode 2>/dev/null || echo off)
if [ -f "$_BRAIN_REMOTE_FILE" ] && [ ! -d "$_GSTACK_HOME/.git" ] && [ "$_BRAIN_SYNC_MODE" = "off" ]; then