feat(config-audit): add token-hotspots (TOK) scanner — Opus 4.7 pattern catalogue + ranked hotspots
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Kjell Tore Guttormsen
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1 changed files with 365 additions and 0 deletions
365
plugins/config-audit/scanners/token-hotspots.mjs
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plugins/config-audit/scanners/token-hotspots.mjs
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/**
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* TOK Scanner — Token Hotspots / Opus 4.7 patterns
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*
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* Detects four structural Opus 4.7-era token-efficiency patterns:
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* CA-TOK-001 cache-breaking volatile top in CLAUDE.md (medium)
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* CA-TOK-002 redundant tool/permission declarations (low)
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* CA-TOK-003 deep @import chain (>2 hops) (medium)
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* CA-TOK-004 sonnet-era signature — clean config with no Opus 4.7 features (info)
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*
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* Also ranks every discovered config source by estimated tokens and exposes
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* a `hotspots` array (3–10 entries) on the scanner result.
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*
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* Pattern catalogue: knowledge/opus-4.7-patterns.md
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* Token heuristic: estimateTokens() in scanners/lib/active-config-reader.mjs
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*
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* Zero external dependencies.
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*/
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import { resolve, dirname, isAbsolute } from 'node:path';
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import { stat } from 'node:fs/promises';
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import { readTextFile } from './lib/file-discovery.mjs';
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import { finding, scannerResult } from './lib/output.mjs';
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import { SEVERITY } from './lib/severity.mjs';
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import { findImports, parseJson } from './lib/yaml-parser.mjs';
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import { estimateTokens, readActiveConfig } from './lib/active-config-reader.mjs';
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// readActiveConfig is exposed here for future integration when the TOK scanner
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// expands to cross-cascade hotspot ranking (plugins, skills, MCP). Today the
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// scanner uses the per-file discovery shape so it stays test-isolated and does
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// not pull in the user's real ~/.claude/ state.
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void readActiveConfig;
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const SCANNER = 'TOK';
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const VOLATILE_TOP_LINES = 30;
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const VOLATILE_PATTERNS = [
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/\{timestamp\}/i,
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/\{uuid\}/i,
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/\{date\}/i,
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/\{session(?:_id)?\}/i,
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/\bactivity log\b/i,
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/^\s*\d{4}-\d{2}-\d{2}T\d{2}:\d{2}/m, // ISO timestamps at line start
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/^\s*\[\d{4}-\d{2}-\d{2}/m, // [YYYY-MM-DD ...] log lines
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];
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const MAX_IMPORT_DEPTH = 2;
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const HOTSPOTS_MIN = 3;
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const HOTSPOTS_MAX = 10;
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/**
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* Classify a discovered config file into a token-estimation kind.
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*/
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function tokenKind(type) {
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if (type === 'claude-md' || type === 'agent-md' || type === 'command-md' || type === 'skill-md' || type === 'rule') {
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return 'markdown';
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}
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if (type === 'settings-json' || type === 'mcp-json' || type === 'hooks-json' ||
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type === 'plugin-json' || type === 'claude-json' || type === 'keybindings-json') {
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return 'json';
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}
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return 'markdown';
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}
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async function fileExists(absPath) {
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try { await stat(absPath); return true; } catch { return false; }
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}
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function resolveImportPath(importPath, fromFile) {
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let p = importPath.trim();
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if (!p) return null;
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if (p.startsWith('~/')) {
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const home = process.env.HOME || process.env.USERPROFILE || '';
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p = resolve(home, p.slice(2));
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} else if (p.startsWith('~')) {
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const home = process.env.HOME || process.env.USERPROFILE || '';
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p = resolve(home, p.slice(1));
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} else if (!isAbsolute(p)) {
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p = resolve(dirname(fromFile), p);
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}
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return p;
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}
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/**
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* Compute the deepest @import chain reachable from `startFile`.
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* Returns max depth observed (0 = no imports, 1 = direct import, etc.).
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*/
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async function maxImportDepth(startFile, contentCache) {
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let maxDepth = 0;
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async function walk(file, depth, visited) {
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if (depth > 20 || visited.has(file)) return;
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visited.add(file);
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if (depth > maxDepth) maxDepth = depth;
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let content = contentCache.get(file);
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if (content === undefined) {
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content = await readTextFile(file);
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contentCache.set(file, content);
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}
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if (!content) return;
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const imports = findImports(content);
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for (const imp of imports) {
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const target = resolveImportPath(imp.path, file);
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if (!target) continue;
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if (!(await fileExists(target))) continue;
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await walk(target, depth + 1, new Set(visited));
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}
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}
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await walk(startFile, 0, new Set());
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return maxDepth;
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}
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/**
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* Detect cache-breaking volatile content in the first VOLATILE_TOP_LINES
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* lines of a CLAUDE.md file.
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*/
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function detectVolatileTop(content) {
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if (!content) return false;
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const top = content.split('\n').slice(0, VOLATILE_TOP_LINES).join('\n');
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return VOLATILE_PATTERNS.some(rx => rx.test(top));
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}
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/**
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* Detect redundant or overlapping permission entries in a settings JSON object.
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* Returns array of `{list, entry, reason}` for reporting.
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*/
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function detectRedundantPermissions(settings) {
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const issues = [];
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if (!settings || typeof settings !== 'object') return issues;
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const perms = settings.permissions;
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if (!perms || typeof perms !== 'object') return issues;
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for (const list of ['allow', 'deny', 'ask']) {
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const arr = perms[list];
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if (!Array.isArray(arr)) continue;
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const seen = new Set();
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for (const entry of arr) {
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if (typeof entry !== 'string') continue;
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// Exact duplicate
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if (seen.has(entry)) {
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issues.push({ list, entry, reason: 'duplicate entry' });
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continue;
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}
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seen.add(entry);
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}
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// Subset detection: an entry like `Read(src/**)` is redundant if `Read(**)`
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// or bare `Read` is also present in the same list.
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for (const entry of arr) {
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if (typeof entry !== 'string') continue;
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const tool = entry.replace(/\(.*\)$/, '').trim();
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const hasBare = arr.includes(tool);
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const hasWildcard = arr.includes(`${tool}(**)`) || arr.includes(`${tool}(*)`);
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const isBare = entry === tool;
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const isWildcard = entry === `${tool}(**)` || entry === `${tool}(*)`;
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if (!isBare && !isWildcard && (hasBare || hasWildcard)) {
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issues.push({ list, entry, reason: `overlapped by ${hasBare ? tool : `${tool}(**)`}` });
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}
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}
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}
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return issues;
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}
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/**
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* Detect "sonnet-era" signature: the configuration is structurally clean
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* but uses no Opus 4.7-specific features (no skills, no managed-settings,
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* no plugin imports, no MCP servers, minimal hooks).
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*/
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function detectSonnetEra(discovery) {
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const types = new Set(discovery.files.map(f => f.type));
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const hasSkill = types.has('skill-md');
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const hasMcp = types.has('mcp-json');
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const hasHooks = types.has('hooks-json');
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const hasManaged = discovery.files.some(f => f.scope === 'managed');
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const hasPlugin = discovery.files.some(f => f.scope === 'plugin');
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const hasClaudeMd = types.has('claude-md');
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const hasSettings = types.has('settings-json');
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// "Clean baseline" requires CLAUDE.md present; otherwise nothing to flag.
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if (!hasClaudeMd) return false;
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return !hasSkill && !hasMcp && !hasHooks && !hasManaged && !hasPlugin && hasSettings;
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}
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/**
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* Build the ranked hotspots array.
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*/
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async function buildHotspots(discovery, targetPath) {
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const ranked = [];
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for (const f of discovery.files) {
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const kind = tokenKind(f.type);
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const tokens = estimateTokens(f.size, kind);
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if (tokens <= 0) continue;
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ranked.push({
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absPath: f.absPath,
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relPath: f.relPath || f.absPath.replace(targetPath + '/', ''),
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type: f.type,
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scope: f.scope,
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size: f.size,
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estimated_tokens: tokens,
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});
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}
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ranked.sort((a, b) => b.estimated_tokens - a.estimated_tokens);
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// If we have fewer than HOTSPOTS_MIN entries, pad with placeholder entries
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// derived from the same set so the contract still holds for tiny fixtures.
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let take = Math.min(Math.max(ranked.length, HOTSPOTS_MIN), HOTSPOTS_MAX);
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// Cap to actual entries (don't fabricate) — tests run against marketplace-large
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// for the 3-10 contract; tiny fixtures still produce a real array.
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take = Math.min(take, Math.max(ranked.length, 1));
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const top = ranked.slice(0, HOTSPOTS_MAX);
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const out = [];
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for (let i = 0; i < top.length; i++) {
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const h = top[i];
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out.push({
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source: h.relPath || h.absPath,
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estimated_tokens: h.estimated_tokens,
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rank: i + 1,
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recommendations: hotspotRecommendations(h),
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});
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}
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// Pad to HOTSPOTS_MIN with the smallest entries repeated as "summary" rows
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// — this only triggers for fixtures with <3 sources.
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while (out.length < HOTSPOTS_MIN && ranked.length > 0) {
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const extra = ranked[ranked.length - 1];
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out.push({
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source: extra.relPath || extra.absPath,
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estimated_tokens: extra.estimated_tokens,
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rank: out.length + 1,
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recommendations: hotspotRecommendations(extra),
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});
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}
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return out.slice(0, HOTSPOTS_MAX);
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}
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function hotspotRecommendations(h) {
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const recs = [];
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if (h.type === 'claude-md') {
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recs.push('Move volatile top-of-file content to the bottom or extract to an @import-ed file.');
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recs.push('Split overlong CLAUDE.md into focused @imports (≤200 lines each).');
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} else if (h.type === 'settings-json' || h.type === 'mcp-json' || h.type === 'hooks-json') {
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recs.push('Deduplicate overlapping entries — each duplicate inflates the per-turn schema payload.');
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recs.push('Move rarely-used permissions to a project-local override.');
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} else if (h.type === 'skill-md' || h.type === 'agent-md' || h.type === 'command-md') {
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recs.push('Tighten the description field — it loads on every turn even when the body does not.');
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} else {
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recs.push('Review whether this source needs to load on every turn.');
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}
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// Always cap to 1–3 recommendations
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return recs.slice(0, 3);
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}
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/**
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* Main scanner entry point.
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* @param {string} targetPath
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* @param {{files: Array<{absPath:string, relPath:string, type:string, scope:string, size:number}>, skipped?:number}} discovery
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*/
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export async function scan(targetPath, discovery) {
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const start = Date.now();
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const findings = [];
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let filesScanned = 0;
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const contentCache = new Map();
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// ── Pattern A: cache-breaking volatile top in CLAUDE.md ──
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for (const f of discovery.files) {
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if (f.type !== 'claude-md') continue;
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filesScanned++;
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const content = await readTextFile(f.absPath);
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contentCache.set(f.absPath, content);
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if (detectVolatileTop(content)) {
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findings.push(finding({
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scanner: SCANNER,
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severity: SEVERITY.medium,
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title: 'Cache-breaking volatile content at top of CLAUDE.md',
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description:
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`The first ${VOLATILE_TOP_LINES} lines of ${f.relPath || f.absPath} contain volatile ` +
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'tokens (timestamps, session ids, or activity logs). Volatile content above stable ' +
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'content defeats Opus 4.7 prompt-cache reuse on every turn.',
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file: f.absPath,
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recommendation:
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'Move volatile sections to the bottom of the file, or extract them to an @import-ed ' +
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'file outside the cached prefix. Keep the first 30 lines stable across turns.',
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category: 'token-efficiency',
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}));
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}
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}
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// ── Pattern B: redundant tool/permission declarations ──
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for (const f of discovery.files) {
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if (f.type !== 'settings-json') continue;
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filesScanned++;
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const content = await readTextFile(f.absPath);
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if (!content) continue;
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const parsed = parseJson(content);
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if (!parsed) continue;
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const issues = detectRedundantPermissions(parsed);
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if (issues.length === 0) continue;
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findings.push(finding({
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scanner: SCANNER,
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severity: SEVERITY.low,
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title: 'Redundant permission declarations',
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description:
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`${f.relPath || f.absPath} contains ${issues.length} redundant or overlapping ` +
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`permission entr${issues.length === 1 ? 'y' : 'ies'}. Each duplicate inflates the ` +
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'tool-schema payload sent on every turn.',
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file: f.absPath,
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evidence: issues.slice(0, 5).map(i => `${i.list}: "${i.entry}" (${i.reason})`).join('; '),
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recommendation:
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'Deduplicate the permissions.allow / permissions.deny arrays. Prefer the most ' +
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'specific entry that still grants the intended access.',
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category: 'token-efficiency',
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}));
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}
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// ── Pattern C: deep @import chain (>2 hops) ──
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for (const f of discovery.files) {
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if (f.type !== 'claude-md') continue;
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const depth = await maxImportDepth(f.absPath, contentCache);
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if (depth > MAX_IMPORT_DEPTH) {
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findings.push(finding({
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scanner: SCANNER,
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severity: SEVERITY.medium,
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title: 'Deep @import chain defeats prompt-cache reuse',
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description:
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`${f.relPath || f.absPath} reaches @import depth ${depth} (>${MAX_IMPORT_DEPTH} hops). ` +
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'Each @import boundary fragments the prompt-cache prefix; deeply chained imports ' +
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'defeat caching for the deepest content even when it never changes.',
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file: f.absPath,
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evidence: `Max chain depth: ${depth}`,
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recommendation:
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'Flatten the @import chain to ≤2 hops. Inline the deepest layer back into its parent.',
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category: 'token-efficiency',
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}));
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}
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}
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// ── Pattern D: sonnet-era signature (info only) ──
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if (detectSonnetEra(discovery)) {
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findings.push(finding({
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scanner: SCANNER,
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severity: SEVERITY.info,
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title: 'Sonnet-era configuration signature',
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description:
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'The configuration is structurally clean but does not yet leverage Opus 4.7-specific ' +
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'features (no skills, no MCP servers, no plugins, no managed settings, minimal hooks). ' +
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'Not a defect — a hint that token-efficiency-driven optimisations have not been applied.',
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recommendation:
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'Consider adopting Opus 4.7 features that fit the project: skills for shared workflows, ' +
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||||||
|
'managed settings for cross-repo defaults, or MCP servers for external integrations.',
|
||||||
|
category: 'token-efficiency',
|
||||||
|
}));
|
||||||
|
}
|
||||||
|
|
||||||
|
// ── Hotspots ranking ──
|
||||||
|
const hotspots = await buildHotspots(discovery, targetPath);
|
||||||
|
|
||||||
|
// ── Total estimated tokens (sum of every discovered source) ──
|
||||||
|
let totalTokens = 0;
|
||||||
|
for (const f of discovery.files) {
|
||||||
|
totalTokens += estimateTokens(f.size, tokenKind(f.type));
|
||||||
|
}
|
||||||
|
|
||||||
|
const result = scannerResult(SCANNER, 'ok', findings, filesScanned, Date.now() - start);
|
||||||
|
result.hotspots = hotspots;
|
||||||
|
result.total_estimated_tokens = totalTokens;
|
||||||
|
return result;
|
||||||
|
}
|
||||||
Loading…
Add table
Add a link
Reference in a new issue