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Parametric learning in your code harness.
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210// A machine is a small, spec'd agent loop with an attached evaluator. The// spec is plain code: what the machine is for, how it is instructed, which// model and tools it uses, what good output looks like (the rubric), and how// each part of that is graded (the evaluator). A child machine specializes a// parent: it inherits the parent's rubric, graders, instructions, tools, and// model, and adds its own criteria and instructions on top.
import type { Evaluator } from "./evaluator.ts";import type { Tool } from "./harness.ts";import type { Rubric } from "./rubric.ts";import type { Run } from "./types.ts";import { existsSync, readFileSync } from "node:fs";import path from "node:path";import { fileURLToPath } from "node:url";import { priceCheckpointAs } from "./pricing.ts";import { nameSegments } from "./store.ts";
export type MachineSpec<R extends Rubric> = { /** Readable address within a workspace. Nested machines use "/", e.g. "chatbot/triage". */ name: string; /** One or two sentences: the job this machine does and for whom. */ intent: string; /** System instructions given to the model on every run. */ instructions: string; /** Default model id; a run may override it. */ model: string; rubric: R; evaluator: Evaluator<R>; tools?: Tool[]; /** Upper bound on model calls per run, counting tool round trips. Defaults to the harness's. Children inherit it. */ maxSteps?: number; /** * Rewrites the model's reasoning when runs are exported for training, e.g. * into another script, so fine-tuning teaches the model to think that way. * Children inherit it unless they set their own. */ transformReasoning?: (reasoning: string) => string; /** * Another machine that plays the other side of a conversation, such as a * simulated user. With one, each case is the counterpart's starting point * (e.g. a hidden scenario), and running a case means a whole conversation: * see converse. Children inherit it unless they set their own. */ counterpart?: Counterpart;};
/** The other side of a machine's conversations. */export type Counterpart = { machine: Machine; /** The conversation ends after the first turn of the machine for which this is true (e.g. it filed its ticket). */ until?: (run: Run) => boolean; /** Most turns of the machine before the conversation stops. Default 8. */ maxTurns?: number; /** The counterpart's first input for a case. Default: the case itself. */ opening?: (caseInput: string) => string;};
export type Machine<R extends Rubric = Rubric> = Readonly< Required<Omit<MachineSpec<R>, "maxSteps" | "transformReasoning" | "counterpart">> & { maxSteps?: number; transformReasoning?: (reasoning: string) => string; counterpart?: Counterpart; /** The machine's own instructions. For a child, `instructions` is its parent's followed by these. */ ownInstructions: string; /** The machine this one specializes, if any. */ parent?: Machine; }>;
export function defineMachine<R extends Rubric>(spec: MachineSpec<R>): Machine<R> { validate(spec); return Object.freeze({ ...spec, tools: spec.tools ?? [], ownInstructions: spec.instructions });}
/** What a child declares: only its own additions. Model defaults to the parent's. */export type ChildSpec<R extends Rubric> = Omit<MachineSpec<R>, "model"> & { model?: string };
/** * A child machine specializes its parent within the parent's constraints. It * inherits every rubric criterion with its grader (it may add criteria but * not redefine or drop inherited ones), the parent's instructions (its own * follow them), the parent's tools (it may add more), and the parent's model * unless it names its own. Its name nests under the parent's: * `defineChild(julia, { name: "julia/parametric", ... })`. */export function defineChild<P extends Rubric, R extends Rubric>(parent: Machine<P>, spec: ChildSpec<R>): Machine<P & R> { if (!spec.name.startsWith(`${parent.name}/`) || spec.name.slice(parent.name.length + 1).includes("/")) { throw new Error(`Child machine "${spec.name}" must be named "${parent.name}/<child>".`); } for (const id of Object.keys(spec.rubric)) { if (id in parent.rubric) throw new Error(`Child machine "${spec.name}" redefines criterion "${id}", which it inherits from "${parent.name}".`); } validate({ ...spec, model: spec.model ?? parent.model }); const tools = [...parent.tools, ...(spec.tools ?? [])]; const seen = new Set<string>(); for (const tool of tools) { if (seen.has(tool.name)) throw new Error(`Child machine "${spec.name}" declares tool "${tool.name}", which it already inherits.`); seen.add(tool.name); } return Object.freeze({ name: spec.name, intent: spec.intent, instructions: composeInstructions(parent, spec.instructions), ownInstructions: spec.instructions, model: spec.model ?? parent.model, rubric: Object.freeze({ ...parent.rubric, ...spec.rubric }) as P & R, evaluator: Object.freeze({ ...parent.evaluator, ...spec.evaluator }) as Evaluator<P & R>, tools, ...(spec.maxSteps ?? parent.maxSteps ? { maxSteps: spec.maxSteps ?? parent.maxSteps } : {}), ...(spec.transformReasoning ?? parent.transformReasoning ? { transformReasoning: spec.transformReasoning ?? parent.transformReasoning } : {}), ...(spec.counterpart ?? parent.counterpart ? { counterpart: spec.counterpart ?? parent.counterpart } : {}), parent, });}
/** The same machine with different own instructions; a child keeps its parent's in front. */export function withInstructions<R extends Rubric>(machine: Machine<R>, ownInstructions: string): Machine<R> { return Object.freeze({ ...machine, ownInstructions, instructions: machine.parent ? composeInstructions(machine.parent, ownInstructions) : ownInstructions, });}
/** The same machine on another model. */export function withModel<R extends Rubric>(machine: Machine<R>, model: string): Machine<R> { if (!model.trim()) throw new Error(`Machine "${machine.name}" needs a non-empty model.`); return Object.freeze({ ...machine, model });}
/** The same machine graded by another rubric and evaluator (e.g. today's, to compare against an old version). */export function withEvaluation<R extends Rubric>(machine: Machine, rubric: R, evaluator: Evaluator<R>): Machine<R> { validate({ ...machine, rubric, evaluator }); return Object.freeze({ ...machine, rubric, evaluator });}
/** The machine and its ancestors, root first. */export function lineage(machine: Machine): Machine[] { return machine.parent ? [...lineage(machine.parent), machine] : [machine];}
function composeInstructions(parent: Machine, own: string): string { return `${parent.instructions}\n\n${own}`;}
function validate<R extends Rubric>(spec: MachineSpec<R>) { nameSegments(spec.name, "machine name"); if (spec.counterpart) { const { maxTurns } = spec.counterpart; if (maxTurns !== undefined && !(Number.isInteger(maxTurns) && maxTurns > 0)) throw new Error(`Machine "${spec.name}" needs a positive whole counterpart.maxTurns.`); if (spec.counterpart.machine.name === spec.name) throw new Error(`Machine "${spec.name}" cannot be its own counterpart.`); } if (spec.maxSteps !== undefined && !(Number.isInteger(spec.maxSteps) && spec.maxSteps > 0)) throw new Error(`Machine "${spec.name}" needs a positive whole maxSteps.`); for (const field of ["intent", "instructions", "model"] as const) { if (!spec[field]?.trim()) throw new Error(`Machine "${spec.name}" needs a non-empty ${field}.`); } for (const id of Object.keys(spec.rubric)) { if (!spec.evaluator[id]) throw new Error(`Machine "${spec.name}" has no grader for criterion "${id}".`); } for (const id of Object.keys(spec.evaluator)) { if (!(id in spec.rubric)) throw new Error(`Machine "${spec.name}" grades "${id}", which its rubric does not declare.`); } const names = new Set<string>(); for (const tool of spec.tools ?? []) { if (names.has(tool.name)) throw new Error(`Machine "${spec.name}" declares tool "${tool.name}" twice.`); names.add(tool.name); }}
/** A machine whose instructions live in this file, beside its machine.ts, declares them an optimization target. */export const INSTRUCTIONS_FILE = "instructions.md";
/** A machine whose model comes from modelFrom keeps its committed model in this file, beside its machine.ts. */export const MODEL_FILE = "model.json";
/** What model.json holds: the live model and, for a tinker:// checkpoint, the base model it was trained from. */export type ModelFile = { model: string; baseModel?: string };
const MODEL_FILE_DIRS = new Set<string>();
/** * The machine's model: the one committed to model.json beside the calling * module (by `machine commit` or `m.update({ model })`), else `fallback`. * `model: modelFrom(import.meta.url, "Qwen/Qwen3.6-35B-A3B")`. A committed * checkpoint is registered with its base model for pricing. */export function modelFrom(moduleUrl: string, fallback: string): string { const dir = path.dirname(fileURLToPath(moduleUrl)); MODEL_FILE_DIRS.add(dir); const file = path.join(dir, MODEL_FILE); if (!existsSync(file)) return fallback; const parsed = JSON.parse(readFileSync(file, "utf8")) as Partial<ModelFile>; if (typeof parsed.model !== "string" || !parsed.model.trim()) throw new Error(`${file} needs a "model" string.`); if (parsed.baseModel) priceCheckpointAs(parsed.model, parsed.baseModel); return parsed.model;}
/** Whether the machine defined in `dir` takes its model from model.json (it called modelFrom). */export function usesModelFile(dir: string): boolean { return MODEL_FILE_DIRS.has(path.resolve(dir));}
/** Read instructions.md from the directory of the calling module: `instructionsFrom(import.meta.url)`. */export function instructionsFrom(moduleUrl: string): string { const file = fileURLToPath(new URL(INSTRUCTIONS_FILE, moduleUrl)); const text = readFileSync(file, "utf8").trim(); if (!text) throw new Error(`${file} is empty.`); return text;}