Added nono profiles & orca integration - Added some extensions to start working on
This commit is contained in:
@@ -0,0 +1,575 @@
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/**
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* pi backend — real implementation over the pi SDK.
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*
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* Each subagent is an in-process `AgentSession` (a port of v1
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* subagents/manager.ts + shared/child-session.ts):
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* - real session files visible in /resume, child resources loaded per-cwd
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* with trust gating, and the child tool denylist;
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* - `session.subscribe()` events translated to normalized SubagentEvents;
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* - send() steers a streaming run or starts a fresh prompt() when idle;
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* - interrupt clears the queue and aborts; closing the session scope emits
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* the child session_shutdown hook and disposes the session.
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*/
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import type { AssistantMessage, Message, Model } from "@earendil-works/pi-ai";
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import type {
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AgentSession,
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AgentSessionEvent,
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ModelRegistry,
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} from "@earendil-works/pi-coding-agent";
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import {
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createAgentSession,
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DefaultResourceLoader,
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getAgentDir,
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SessionManager,
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SettingsManager,
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} from "@earendil-works/pi-coding-agent";
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import type { Cause, Scope } from "effect";
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import { Effect, Queue, Stream } from "effect";
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import type { SubagentBackend, SubagentSession } from "../backend.ts";
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import type {
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SpawnTask,
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SubagentEvent,
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SubagentMeta,
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TranscriptPart,
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} from "../domain.ts";
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import { SendError, SpawnError } from "../domain.ts";
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import { createToolCallTimeoutGuard } from "../../../shared/tool-call-timeout.ts";
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const CHILD_SHUTDOWN_TIMEOUT_MS = 5_000;
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/** Tools that headless children must not receive. Everything else stays enabled. */
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const CHILD_EXCLUDED_TOOL_NAMES = [
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"subagent_spawn",
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"subagent_wait",
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"subagent_cancel",
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"subagent_check",
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"subagent_list",
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"workflow",
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"ask_user",
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] as const;
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// --- Model + effort resolution -----------------------------------------------
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type ThinkingLevel = NonNullable<
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NonNullable<Parameters<typeof createAgentSession>[0]>["thinkingLevel"]
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>;
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/**
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* Resolve the generic model hint against the parent registry (v1 semantics):
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* "provider/model-id" is exact; a bare id prefers the inherited provider,
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* then must be unambiguous across providers. No hint inherits the parent
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* model; with nothing to inherit, the SDK default applies.
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*/
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function resolvePiModel(
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registry: ModelRegistry,
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hint: string | undefined,
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inherited: { provider: string; id: string } | undefined,
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): Model<any> | undefined {
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if (!hint) {
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if (!inherited) return undefined;
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return registry.find(inherited.provider, inherited.id) ?? undefined;
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}
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const slash = hint.indexOf("/");
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if (slash > 0) {
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const provider = hint.slice(0, slash);
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const id = hint.slice(slash + 1);
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const found = registry.find(provider, id);
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if (found) return found;
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throw new Error(`Unknown model "${hint}".`);
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}
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if (inherited) {
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const found = registry.find(inherited.provider, hint);
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if (found) return found;
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}
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const matches = registry.getAll().filter((m) => m.id === hint);
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if (matches.length === 1) return matches[0];
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if (matches.length > 1) {
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throw new Error(
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`Model "${hint}" exists in multiple providers (${matches.map((m) => m.provider).join(", ")}). Use "provider/${hint}".`,
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);
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}
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throw new Error(`Unknown model "${hint}".`);
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}
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// --- Child session helpers (ported from v1 shared/child-session.ts) -----------
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/** Load normal global/package resources and trust-gated project resources. */
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async function createChildResources(cwd: string, projectTrusted: boolean) {
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const agentDir = getAgentDir();
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const settingsManager = SettingsManager.create(cwd, agentDir, {
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projectTrusted,
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});
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const loader = new DefaultResourceLoader({ cwd, agentDir, settingsManager });
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await loader.reload();
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return { loader, settingsManager };
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}
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function waitBounded(operation: Promise<unknown>, timeoutMs: number) {
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let timer: ReturnType<typeof setTimeout> | undefined;
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const timeout = new Promise<void>((resolve) => {
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timer = setTimeout(resolve, timeoutMs);
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});
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return Promise.race([
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operation.then(
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() => undefined,
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() => undefined,
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),
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timeout,
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])
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.catch(() => {})
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.finally(() => {
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if (timer) clearTimeout(timer);
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});
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}
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/** Emit child session_shutdown (bounded), then dispose. Never throws. */
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async function shutdownAndDisposeChildSession(session: AgentSession) {
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try {
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if (session.extensionRunner.hasHandlers("session_shutdown")) {
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await waitBounded(
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session.extensionRunner.emit({
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type: "session_shutdown",
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reason: "quit",
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}),
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CHILD_SHUTDOWN_TIMEOUT_MS,
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);
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}
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} catch {
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// Extension runner inspection/emission is best-effort during teardown.
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} finally {
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try {
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session.dispose();
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} catch {
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// Disposal is terminal and must remain idempotent for callers.
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}
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}
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}
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// --- Event translation ----------------------------------------------------------
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function messageRole(msg: unknown): Message["role"] | undefined {
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const role = (msg as { role?: string } | undefined)?.role;
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if (role === "user" || role === "assistant" || role === "toolResult")
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return role;
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return undefined;
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}
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function lastAssistantMessage(
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session: AgentSession,
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): AssistantMessage | undefined {
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const messages = session.messages;
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for (let i = messages.length - 1; i >= 0; i--) {
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const msg = messages[i];
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if (messageRole(msg) === "assistant") return msg as AssistantMessage;
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}
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return undefined;
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}
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/** Final assistant text output (last assistant message with text), v1 semantics. */
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function finalOutput(session: AgentSession): string {
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const messages = session.messages;
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for (let i = messages.length - 1; i >= 0; i--) {
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const msg = messages[i];
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if (messageRole(msg) !== "assistant") continue;
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const text = (msg as AssistantMessage).content
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.filter((part) => part.type === "text")
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.map((part) => part.text)
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.join("\n")
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.trim();
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if (text) return text;
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}
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return "";
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}
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function safeJson(value: unknown): string | undefined {
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try {
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const text = JSON.stringify(value);
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return text === "{}" ? undefined : text.slice(0, 4_096);
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} catch {
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return undefined;
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}
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}
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/** First non-empty line of a tool result-ish value (v1 liveToolPreview). */
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function toolPreview(value: unknown): string | undefined {
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if (typeof value === "string") {
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return value
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.split("\n")
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.find((line) => line.trim())
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?.trim();
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}
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if (!value || typeof value !== "object") return undefined;
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const content = (value as { content?: unknown }).content;
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if (!Array.isArray(content)) return undefined;
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for (const part of content) {
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if (!part || typeof part !== "object") continue;
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const record = part as { type?: unknown; text?: unknown };
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if (record.type !== "text" || typeof record.text !== "string") continue;
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const firstLine = record.text.split("\n").find((line) => line.trim());
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if (firstLine) return firstLine.trim();
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}
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return undefined;
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}
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function assistantParts(msg: AssistantMessage): TranscriptPart[] {
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const parts: TranscriptPart[] = [];
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for (const part of msg.content) {
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if (part.type === "text") {
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parts.push({ type: "text", text: part.text });
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} else if (part.type === "thinking") {
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parts.push({
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type: "thinking",
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text: part.redacted ? "" : part.thinking,
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redacted: part.redacted,
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});
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} else if (part.type === "toolCall") {
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parts.push({
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type: "toolCall",
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toolId: part.id,
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name: part.name,
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argsPreview: safeJson(part.arguments),
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});
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}
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}
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return parts;
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}
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function userText(msg: Message): string {
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const content = (msg as { content: unknown }).content;
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if (typeof content === "string") return content;
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if (!Array.isArray(content)) return "";
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return content
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.filter(
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(part): part is { type: "text"; text: string } =>
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!!part &&
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typeof part === "object" &&
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(part as { type?: unknown }).type === "text",
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)
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.map((part) => part.text)
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.join("\n");
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}
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// --- The session ------------------------------------------------------------------
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function boundedError(error: unknown) {
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return (error instanceof Error ? error.message : String(error)).slice(
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0,
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4096,
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);
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}
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const makePiSession = (
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task: SpawnTask,
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): Effect.Effect<SubagentSession, SpawnError, Scope.Scope> =>
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Effect.gen(function* () {
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const registry = task.parent.modelRegistry;
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if (!registry) {
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return yield* new SpawnError({
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message: "pi backend requires the parent session's model registry.",
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});
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}
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const model = yield* Effect.try({
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try: () =>
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resolvePiModel(registry, task.model, task.parent.inheritedModel),
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catch: (error) => new SpawnError({ message: boundedError(error) }),
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});
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// pi's thinking levels ARE the shared reasoning-effort scale.
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const thinkingLevel = (task.reasoningEffort ??
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task.parent.inheritedThinkingLevel) as ThinkingLevel | undefined;
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const session = yield* Effect.tryPromise({
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try: async () => {
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const { loader, settingsManager } = await createChildResources(
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task.cwd,
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task.parent.projectTrusted,
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);
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const { session } = await createAgentSession({
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cwd: task.cwd,
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sessionManager: SessionManager.create(task.cwd),
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settingsManager,
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resourceLoader: loader,
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model,
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thinkingLevel,
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excludeTools: [...CHILD_EXCLUDED_TOOL_NAMES],
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});
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// Start child extension session hooks/resources in headless mode.
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// A rejection here would otherwise leak the freshly created session:
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// the scope finalizer that owns cleanup is only registered later.
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try {
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await session.bindExtensions({ mode: "print" });
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} catch (error) {
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await shutdownAndDisposeChildSession(session);
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throw error;
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}
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return session;
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},
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catch: (error) => new SpawnError({ message: boundedError(error) }),
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});
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const state = {
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closed: false,
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/** prompt() rejection for the active run; folded into RunSettled. */
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runError: undefined as string | undefined,
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/** One terminal event per run: lifecycle, prompt-rejection, and abort
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* fallbacks can all race to settle; the first wins. */
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settled: false,
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||||
};
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const events = yield* Queue.make<SubagentEvent, Cause.Done>();
|
||||
const emit = (event: SubagentEvent) => {
|
||||
Queue.offerUnsafe(events, event);
|
||||
};
|
||||
|
||||
const toolTimeout = createToolCallTimeoutGuard();
|
||||
toolTimeout.apply(session);
|
||||
|
||||
const activeModel = (): Model<any> | undefined => {
|
||||
const sessionModel = session.model;
|
||||
const last = lastAssistantMessage(session);
|
||||
if (!last) return sessionModel;
|
||||
if (
|
||||
sessionModel &&
|
||||
(last.provider !== sessionModel.provider ||
|
||||
last.model !== sessionModel.id)
|
||||
) {
|
||||
// The session changed models after this assistant response.
|
||||
return sessionModel;
|
||||
}
|
||||
return (
|
||||
registry.find(last.provider, last.responseModel ?? last.model) ??
|
||||
sessionModel
|
||||
);
|
||||
};
|
||||
|
||||
const currentMeta = (): SubagentMeta => {
|
||||
const m = activeModel();
|
||||
return {
|
||||
backend: "pi",
|
||||
modelLabel: m ? `${m.provider}/${m.id}` : undefined,
|
||||
contextWindow: m?.contextWindow,
|
||||
sessionFilePath: session.sessionFile,
|
||||
};
|
||||
};
|
||||
|
||||
const emitUsage = () => {
|
||||
const usage = session.getContextUsage();
|
||||
emit({
|
||||
_tag: "UsageChanged",
|
||||
tokens: usage?.tokens ?? undefined,
|
||||
contextWindow: activeModel()?.contextWindow ?? usage?.contextWindow,
|
||||
});
|
||||
};
|
||||
|
||||
const settle = () => {
|
||||
if (state.settled) return;
|
||||
state.settled = true;
|
||||
const last = lastAssistantMessage(session);
|
||||
const partialText = finalOutput(session) || undefined;
|
||||
if (last?.stopReason === "aborted") {
|
||||
emit({
|
||||
_tag: "RunSettled",
|
||||
outcome: { _tag: "Interrupted", partialText },
|
||||
});
|
||||
return;
|
||||
}
|
||||
const errorText =
|
||||
state.runError ??
|
||||
(last?.stopReason === "error"
|
||||
? (last.errorMessage ?? "Run failed")
|
||||
: undefined);
|
||||
if (errorText !== undefined) {
|
||||
emit({
|
||||
_tag: "RunSettled",
|
||||
outcome: {
|
||||
_tag: "Failed",
|
||||
errorText: boundedError(errorText),
|
||||
partialText,
|
||||
},
|
||||
});
|
||||
return;
|
||||
}
|
||||
emit({
|
||||
_tag: "RunSettled",
|
||||
outcome: { _tag: "Completed", finalText: finalOutput(session) },
|
||||
});
|
||||
};
|
||||
|
||||
const handleEvent = (event: AgentSessionEvent) => {
|
||||
if (state.closed) return;
|
||||
switch (event.type) {
|
||||
case "agent_start":
|
||||
// Extensions may register tools between runs; guard new ones too.
|
||||
toolTimeout.apply(session);
|
||||
state.settled = false;
|
||||
emit({ _tag: "RunStarted" });
|
||||
break;
|
||||
case "message_update": {
|
||||
const streamEvent = event.assistantMessageEvent;
|
||||
if (streamEvent.type === "text_delta") {
|
||||
emit({
|
||||
_tag: "AssistantDelta",
|
||||
kind: "text",
|
||||
delta: streamEvent.delta,
|
||||
});
|
||||
} else if (streamEvent.type === "thinking_delta") {
|
||||
emit({
|
||||
_tag: "AssistantDelta",
|
||||
kind: "thinking",
|
||||
delta: streamEvent.delta,
|
||||
});
|
||||
}
|
||||
break;
|
||||
}
|
||||
case "message_end": {
|
||||
const role = messageRole(event.message);
|
||||
if (role === "user") {
|
||||
const text = userText(event.message as Message);
|
||||
if (text.trim()) emit({ _tag: "UserMessage", text });
|
||||
} else if (role === "assistant") {
|
||||
emit({
|
||||
_tag: "AssistantMessage",
|
||||
parts: assistantParts(event.message as AssistantMessage),
|
||||
});
|
||||
emitUsage();
|
||||
emit({ _tag: "MetaChanged", meta: currentMeta() });
|
||||
}
|
||||
// toolResult messages are covered by tool_execution_end.
|
||||
break;
|
||||
}
|
||||
case "tool_execution_start":
|
||||
emit({
|
||||
_tag: "ToolStart",
|
||||
toolId: event.toolCallId,
|
||||
name: event.toolName,
|
||||
argsPreview: safeJson(event.args),
|
||||
});
|
||||
break;
|
||||
case "tool_execution_update":
|
||||
emit({
|
||||
_tag: "ToolUpdate",
|
||||
toolId: event.toolCallId,
|
||||
outputPreview: toolPreview(event.partialResult),
|
||||
});
|
||||
break;
|
||||
case "tool_execution_end":
|
||||
emit({
|
||||
_tag: "ToolEnd",
|
||||
toolId: event.toolCallId,
|
||||
name: event.toolName,
|
||||
isError: event.isError,
|
||||
outputPreview: toolPreview(event.result),
|
||||
});
|
||||
break;
|
||||
case "queue_update":
|
||||
emit({
|
||||
_tag: "QueueChanged",
|
||||
queued: [
|
||||
...event.steering.map((text) => ({
|
||||
text,
|
||||
kind: "steer" as const,
|
||||
})),
|
||||
...event.followUp.map((text) => ({
|
||||
text,
|
||||
kind: "follow-up" as const,
|
||||
})),
|
||||
],
|
||||
});
|
||||
break;
|
||||
case "agent_settled":
|
||||
settle();
|
||||
break;
|
||||
}
|
||||
};
|
||||
const unsubscribe = session.subscribe(handleEvent);
|
||||
|
||||
yield* Effect.addFinalizer(() =>
|
||||
Effect.promise(async () => {
|
||||
state.closed = true;
|
||||
unsubscribe();
|
||||
try {
|
||||
session.clearQueue();
|
||||
} catch {
|
||||
// Continue with abort/dispose.
|
||||
}
|
||||
await waitBounded(session.abort(), CHILD_SHUTDOWN_TIMEOUT_MS);
|
||||
await shutdownAndDisposeChildSession(session);
|
||||
Queue.endUnsafe(events);
|
||||
}),
|
||||
);
|
||||
|
||||
/** Start a fresh run (v1 manager.run): fire-and-forget, errors -> events. */
|
||||
const startRun = (text: string) => {
|
||||
state.runError = undefined;
|
||||
state.settled = false;
|
||||
emit({ _tag: "RunStarted" });
|
||||
void session.prompt(text).catch((error) => {
|
||||
state.runError = boundedError(error);
|
||||
// Preflight failures may never start the agent lifecycle, so no
|
||||
// agent_settled will arrive for them.
|
||||
if (!session.isStreaming) settle();
|
||||
});
|
||||
};
|
||||
|
||||
// Session naming is best-effort.
|
||||
yield* Effect.try(() =>
|
||||
session.sessionManager.appendSessionInfo(
|
||||
`${task.origin === "btw" ? "btw" : "subagent"}: ${task.title}`,
|
||||
),
|
||||
).pipe(Effect.ignore);
|
||||
|
||||
emit({ _tag: "MetaChanged", meta: currentMeta() });
|
||||
startRun(task.prompt);
|
||||
|
||||
return {
|
||||
meta: Effect.sync(currentMeta),
|
||||
events: Stream.fromQueue(events),
|
||||
send: (text) =>
|
||||
Effect.suspend((): Effect.Effect<void, SendError> => {
|
||||
if (state.closed) {
|
||||
return new SendError({ message: "Subagent session is closed." });
|
||||
}
|
||||
if (session.isStreaming) {
|
||||
// Steer the active run via the SDK's queue; queue_update events
|
||||
// render it, message_end(user) lands it in the transcript. A
|
||||
// rejected steer is a real send failure, not a diagnostic.
|
||||
return Effect.tryPromise({
|
||||
try: () => session.steer(text),
|
||||
catch: (error) => new SendError({ message: boundedError(error) }),
|
||||
}).pipe(Effect.asVoid);
|
||||
}
|
||||
return Effect.sync(() => startRun(text));
|
||||
}),
|
||||
interrupt: Effect.promise(async () => {
|
||||
if (state.closed) return;
|
||||
try {
|
||||
session.clearQueue();
|
||||
} catch {
|
||||
// Abort regardless.
|
||||
}
|
||||
await session.abort().catch(() => undefined);
|
||||
// Only resolve once streaming has actually stopped: reporting the
|
||||
// interrupt as complete while the run keeps working would let the
|
||||
// manager settle a run that is still mutating the workspace. The
|
||||
// manager bounds this effect at 5s and force-disposes on timeout.
|
||||
while (!state.closed && session.isStreaming) {
|
||||
await new Promise((resolve) => setTimeout(resolve, 50));
|
||||
}
|
||||
// No streaming run means no agent_settled will arrive; emit the
|
||||
// terminal event (once) so the run cannot look running forever.
|
||||
if (!state.closed && !state.settled) {
|
||||
state.settled = true;
|
||||
emit({ _tag: "RunSettled", outcome: { _tag: "Interrupted" } });
|
||||
}
|
||||
}),
|
||||
} satisfies SubagentSession;
|
||||
});
|
||||
|
||||
export const piBackend: SubagentBackend = {
|
||||
name: "pi",
|
||||
capabilities: { steering: true, modelSelection: true, reasoningEffort: true },
|
||||
// In-process SDK: always available.
|
||||
available: Effect.succeed(true),
|
||||
spawn: makePiSession,
|
||||
};
|
||||
Reference in New Issue
Block a user