@adlc/core — FROZEN CONTRACT

Shared library for all ADLC tools. This package is frozen during tool builds (rails). Tools import from it; tools never modify it. If the API is insufficient for your tool, work around it inside your own package and note the gap in your README — do not edit core.

Import surface (from a tool at packages/<name>/):

import { complete, fan, fanProviders, extractJson, detectProvider, resolveModel, PROVIDER_NAMES } from '../../core/index.mjs';
import { git, gitDiff, changedFiles, isDirty, isGitRepo, coChange, pairKey, churn } from '../../core/index.mjs';
import { parseArgs, pass, gateFail, opError, printJson, readStdin, promptOnly } from '../../core/index.mjs';
import { ADLC_DIR, appendEntry, readEntries, ledgerPath, sha256, hashFiles } from '../../core/index.mjs';
import { TICKETS_PATH, loadTickets, validateTicket, topoSort, computeFloat, globMatch, inScope, scopesOverlap } from '../../core/index.mjs';
import { mutate } from '../../core/index.mjs'; // mutate.generateMutants / applyMutant / changedLinesFromDiff / OPERATORS

llm

• detectProvider(env?, forceProvider?) → { name, apiKey, models } | null. Order: anthropic, openai, gemini, agy. Force with ADLC_PROVIDER (env) or the forceProvider arg (per-invocation, e.g. a CLI --provider flag — takes precedence over ADLC_PROVIDER).
• PROVIDER_NAMES → ['anthropic', 'openai', 'gemini', 'agy'], for CLI validation of --provider/--providers.
• resolveModel(provider, { tier, model }, env?) → model id. Tiers: cheap | mid | frontier. Override via ADLC_MODEL_CHEAP/MID/FRONTIER.
• complete({ tier, model, system, prompt, maxTokens, provider? }, env?) → Promise<string>. Throws if no provider (tools must catch and offer --prompt-only). provider is a per-invocation override, additive only — omit it and single-provider auto-detect remains the default (cost/latency per ADR-0007).
• fan(opts, n, env?) → Promise<[{ ok, value | error }]> — n independent stateless completions of the SAME (auto-detected or opts.provider-forced) provider.
• fanProviders(opts, providerNames, env?) → Promise<[{ ok, value | error, provider }]> — one completion per DISTINCT named provider (e.g. ['anthropic', 'openai', 'gemini']), instead of N resamples of one provider. A named provider missing its API key surfaces as { ok: false } for that entry only.
• extractJson(text) → parsed JSON value from messy model output. Throws if none.

git

• git(args[], opts?) → stdout string (execFileSync; throws on non-zero).
• isGitRepo(cwd?), gitDiff(base?, cwd?), changedFiles(base?, cwd?), isDirty(cwd?).
• coChange(limit?, cwd?) → { pairCounts: {'a b': n}, fileCounts } (logical coupling; commits touching >50 files skipped). Pair keys via pairKey(a, b) (sorted).
• churn(limit?, cwd?) → { file: commitCount }.

cli

• parseArgs(config) — node:util parseArgs with allowPositionals: true default.
• pass(msg?) exit 0 · gateFail(msg, details?) exit 2 · opError(msg) exit 1.
• printJson(obj), readStdin(), promptOnly(promptOrArray) (print prompt(s), exit 0).

Exit codes are the contract: 0 = gate passes, 1 = operational error, 2 = gate fails.

ledger (persistence at .adlc/)

• appendEntry(name, entry, dir?) → appends to .adlc/<name>.jsonl.
• appendEntries(name, entriesOrFactory, dir?) → appends a durable batch under one owner-token lock; factories receive the byte-exact locked ledger tail for safe sequence and hash-chain allocation.
• readEntries(name, dir?) → { entries, skipped } — malformed lines reported, never swallowed.
• sha256(content), hashFiles(paths) → { path: hash | null }.

Well-known ledger names: manifest (gate-manifest entries), findings (prosecution findings: { ts, tool, file, line, category, severity, desc, verdict }).

tickets (canonical logical store)

Schema (see lib/tickets.mjs header): { id, title, body, scope[], rails[], edges[{to, contract}], duration, category, budget }.

• loadTickets(path?) → { tickets, errors } (reads legacy JSON or the sibling sharded store and validates ids, duplicate ids, unknown edges).
• validateTicket(t) → errors[].
• topoSort(tickets) → { order, cycle | null }. Edges mean "completes before edge.to".
• computeFloat(tickets) → { floats: {id: n}, criticalPath: [ids], makespan } (CPM; duration default 1) or { error } on cycle.
• globMatch(pattern, path) (*, **), inScope(ticket, path), scopesOverlap(a, b) (conservative).

mutate

• mutate.OPERATORS — invert-comparison, bool-flip, null-return, off-by-one, logic-swap.
• mutate.generateMutants(content, { targetLines?, maxMutants? }) → [{ line, operator, original, mutated }] (skips comments/imports/console lines).
• mutate.applyMutant(content, mutant) → mutated content (throws if line content drifted).
• mutate.changedLinesFromDiff(diffText) → { file: Set<newSideLineNo> }.