tool-call id uniquifier: the Lacan fix (owner-approved 2026-10-04)
DeepSeek via OpenRouter returns tool-call ids that reset every response — a one-call-per-turn session names every call call_0. Everything keys on toolCallId (the fold's call↔result join, the pending gate, answer routing, the option-shuffle seed), so the Lacan session corrupted: the quiz answer overwrote the ask card, the ask question vanished, and the order scrambled. Record itself was always intact. - src/server/pi/call-ids.ts (new): ToolCallIdUniquifier at the wire boundary — colliding ids remint once (orig~2, ~3…), the same mints at settlement; tables key by message OBJECT IDENTITY (streaming messages carry no ids; the message_end object is reference-identical to the state object). History never rewrites; providers see paired ids, which is protocol-legal (pi synthesizes ids for providers that send none). - ui-stream: runPiTurn remaps events + settles through the uniquifier (spec.usedToolCallIds, seeded by chat-handler from the record). - view.ts: findToolPart scans newest-first — pre-fix duplicate-id records (the existing Lacan session) heal on next render. - tests: 9 unit pins (call-ids.test.ts) + the two-call_0 e2e (chat-flow): ask answered as ask, quiz as quiz, ids unique in the record.
This commit is contained in:
amosblomqvist
+9
-1
@@ -129,7 +129,15 @@ export function projectView(messages: readonly LhMessage[], live?: LiveTurnState
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};
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const findToolPart = (toolCallId: string): LhViewPart | undefined => {
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for (let i = out.length - 1; i >= 0; i--) {
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for (const part of out[i]!.parts) {
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// NEWEST-FIRST part scan within a group (the Lacan heal, 2026-10-04):
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// a result pairs with the most RECENT call carrying its id. Unique
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// ids (the uniquifier guarantees them for new turns) make scan order
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// irrelevant; for legacy duplicate-id records (DeepSeek's per-response
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// `call_0`) this routes each answer to its own call instead of letting
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// a later result overwrite an earlier question's card.
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const parts = out[i]!.parts;
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for (let p = parts.length - 1; p >= 0; p--) {
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const part = parts[p]!;
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if (part.type.startsWith("tool-") && part.toolCallId === toolCallId) return part;
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}
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}
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@@ -17,6 +17,7 @@ import {
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unregisterLiveAgent,
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} from "./jobs.ts";
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import { piTurnResponse, runPiTurn } from "./pi/ui-stream.ts";
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import { collectToolCallIds } from "./pi/call-ids.ts";
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import { effectiveSettings, stores } from "./stores.ts";
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import { searchAvailable, searchProvider } from "./search.ts";
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import { providerKeyPresent } from "./keys.ts";
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@@ -379,6 +380,12 @@ export async function handleChatInput(
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registerLiveAgent(chatId, constructed);
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const handle = runPiTurn({
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agent: constructed,
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// THE LACAN FIX (2026-10-04): seed the uniquifier with every
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// tool-call id the record already holds — a provider that resets
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// ids per response (DeepSeek) then gets fresh unique ids for this
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// turn's calls at the wire boundary, on the wire, in the record,
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// and in the next turn's context alike.
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usedToolCallIds: new Set(collectToolCallIds(merged)),
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// Stream-level failures are provider/transport internals — masked,
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// like the SDK defaults. Tool-input validation messages never
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// route through here: they ride the error-result path and reach the
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@@ -0,0 +1,212 @@
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import type { AgentEvent } from "@earendil-works/pi-agent-core";
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/**
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* TOOL-CALL ID UNIQUIFICATION (owner-approved fix, 2026-10-04 — the Lacan
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* incident): some providers (DeepSeek via OpenRouter, observed live) return
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* tool-call ids that reset every response — `call_0`, `call_1`, … — so a
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* one-call-per-turn session names EVERY call `call_0`. Everything in this
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* app keys on toolCallId (the view fold's call↔result join, the pending-
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* question gate, answer routing, the option-shuffle seed), so cross-turn
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* duplicates corrupted all of them at once: the fold applied the quiz
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* answer to the ASK card, the ask question vanished, the order scrambled.
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*
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* THE LAW: ids are uniquified ONCE, at the wire boundary — this class sits
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* inside runPiTurn, sees every AgentEvent before any view, and applies the
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* same minting at settlement. The client, the persisted record, the dock,
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* the answer flow, and the next turn's provider context (rebuilt from the
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* record) all see exactly one set of unique ids. Provider context stays
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* internally paired (call and result rewrite together), which the
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* OpenAI-compatible APIs accept — pi itself synthesizes ids for providers
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* that return none, so arbitrary-but-paired ids are already protocol-legal.
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* History is NEVER rewritten: record messages pass through untouched, and
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* pre-fix duplicate records heal at the fold (view.ts pairs results
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* newest-first).
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*
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* SCHEME: a per-chat seen-set (seeded from the record at turn start) plus
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* per-message tables. Streaming messages carry NO id (ids are stamped at
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* persist), so tables key by OBJECT IDENTITY — the message_end event's
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* object is reference-identical to the object in agent.state.messages
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* (verified against pi-agent-core), and a WeakMap joins the two. A fresh
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* table (epoch) opens at each assistant message_start; the update/end
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* objects of that message attach to it; mints claim once per message, so
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* the same id in a SECOND message of the turn (a retry step) gets its own
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* mint. Colliding ids become `${orig}~2`, `~3`, … skipping used ones.
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*/
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/** Structurally walk any message's content for tool-call blocks. */
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function callBlocks(message: unknown): Array<{ id: string } & Record<string, unknown>> {
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const content = (message as { content?: unknown } | undefined)?.content;
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if (!Array.isArray(content)) return [];
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return content.filter(
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(b): b is { id: string } & Record<string, unknown> =>
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(b as { type?: string } | null)?.type === "toolCall" && typeof (b as { id?: unknown }).id === "string",
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);
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}
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/** The ids every consumer may already have seen: all call ids and result
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* ids in a message list (the chat record — including its legacy dupes,
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* which is the point: membership is what drives minting). */
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export function collectToolCallIds(messages: readonly unknown[]): string[] {
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const ids: string[] = [];
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for (const m of messages) {
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const role = (m as { role?: string }).role;
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if (role === "assistant") {
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for (const b of callBlocks(m)) ids.push(b.id);
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} else if (role === "toolResult") {
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const id = (m as { toolCallId?: unknown }).toolCallId;
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if (typeof id === "string") ids.push(id);
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}
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}
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return ids;
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}
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export class ToolCallIdUniquifier {
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private readonly seen = new Set<string>();
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/** assistant message object → its (origId → uniqueId) table. Weak: the
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* agent's turn dies at settle; nothing here outlives it. */
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private readonly tables = new WeakMap<object, Map<string, string>>();
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/** The current assistant message's table — opened at its message_start,
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* shared by its update/end objects, and the resolution scope for its
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* tool_execution events (which fire after its message_end but before
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* the next message_start). */
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private epoch: Map<string, string> | null = null;
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constructor(usedIds: Iterable<string>) {
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for (const id of usedIds) this.seen.add(id);
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}
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/** Keep `orig` if never used; otherwise mint an unused `${orig}~n`. */
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private claim(orig: string): string {
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if (!this.seen.has(orig)) {
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this.seen.add(orig);
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return orig;
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}
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for (let n = 2; ; n++) {
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const candidate = `${orig}~${n}`;
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if (!this.seen.has(candidate)) {
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this.seen.add(candidate);
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return candidate;
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}
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}
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}
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/** Register + rewrite one message's tool-call blocks (idempotent across
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* the repeated partials of message_update). Returns a cloned message
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* when any id changed, else the original object. */
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private remapMessageContent(message: unknown): unknown {
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if ((message as { role?: string }).role !== "assistant") return message;
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const blocks = callBlocks(message);
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if (blocks.length === 0) return message;
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// Attach to the current epoch unless this object already has a table
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// (a re-emitted update/end). A message event with no open epoch
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// (defensive: a stream that skips message_start) opens one.
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let table = this.tables.get(message as object);
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if (!table) {
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table = this.epoch ?? new Map();
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this.epoch = table;
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this.tables.set(message as object, table);
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} else {
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this.epoch = table;
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}
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let changed = false;
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const content = (message as { content: unknown[] }).content.map((block) => {
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if ((block as { type?: string }).type !== "toolCall") return block;
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const orig = (block as { id?: unknown }).id;
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if (typeof orig !== "string") return block;
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let mapped = table!.get(orig);
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if (mapped === undefined) {
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mapped = this.claim(orig);
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table!.set(orig, mapped);
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}
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if (mapped === orig) return block;
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changed = true;
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return { ...(block as object), id: mapped };
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});
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return changed ? { ...(message as object), content } : message;
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}
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/** Every AgentEvent, ids uniquified. Structural and total: unknown
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* event shapes pass through untouched. */
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event(event: AgentEvent): AgentEvent {
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switch (event.type) {
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case "message_start": {
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const e = event as { message: { role?: string } };
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// A new assistant message opens a fresh epoch — this is what
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// keeps a retried id in a LATER message from reusing the
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// earlier message's mint.
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if (e.message?.role === "assistant") this.epoch = new Map();
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return this.remapEventMessage(event);
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}
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case "message_update":
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case "message_end":
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return this.remapEventMessage(event);
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case "tool_execution_start":
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case "tool_execution_update":
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case "tool_execution_end": {
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const { toolCallId } = event as { toolCallId: string };
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const mapped = this.epoch?.get(toolCallId) ?? toolCallId;
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if (mapped === toolCallId) return event;
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return { ...(event as object), toolCallId: mapped } as AgentEvent;
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}
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case "turn_end": {
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const e = event as { message: unknown; toolResults: Array<{ toolCallId?: string }> };
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const message = this.remapMessageContent(e.message);
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const table = this.epoch;
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const toolResults = table
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? e.toolResults.map((r) =>
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typeof r.toolCallId === "string" && table.has(r.toolCallId)
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? { ...r, toolCallId: table.get(r.toolCallId)! }
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: r,
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)
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: e.toolResults;
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return { ...(e as object), message, toolResults } as unknown as AgentEvent;
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}
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case "agent_end": {
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const e = event as { messages: unknown[] };
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return { ...(e as object), messages: this.remapSettled(e.messages) } as unknown as AgentEvent;
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}
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default:
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return event;
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}
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}
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private remapEventMessage(event: AgentEvent): AgentEvent {
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const e = event as { message: unknown };
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const remapped = this.remapMessageContent(e.message);
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if (remapped === e.message) return event;
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return { ...(event as object), message: remapped } as AgentEvent;
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}
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/** The settle seam: the agent's final state, rewritten to the ids the
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* wire already showed. Only THIS turn's messages rewrite (the ones
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* registered by their event objects); prior-turn history — including
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* legacy duplicate-id records — passes through verbatim. Tool results
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* pair with the most recent registered assistant message (the loop's
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* own structure: results follow their calls). */
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remapSettled(messages: readonly unknown[]): unknown[] {
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let scope: Map<string, string> | undefined;
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return messages.map((m) => {
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const role = (m as { role?: string }).role;
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if (role === "assistant") {
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const table = this.tables.get(m as object);
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if (!table) {
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// Prior-turn or unregistered: history is never rewritten.
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scope = undefined;
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return m;
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}
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scope = table;
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return this.remapMessageContent(m);
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}
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if (role === "toolResult") {
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const orig = (m as { toolCallId?: unknown }).toolCallId;
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if (scope && typeof orig === "string" && scope.has(orig)) {
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return { ...(m as object), toolCallId: scope.get(orig)! };
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}
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return m;
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}
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return m;
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});
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}
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}
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@@ -1,11 +1,15 @@
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import type { Agent, AgentEvent, AgentMessage } from "@earendil-works/pi-agent-core";
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import type { SteerMessage } from "../../core/contracts.ts";
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import { noteSteerVisible } from "../jobs.ts";
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import { ToolCallIdUniquifier } from "./call-ids.ts";
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/**
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* THE NATIVE WIRE (Wave D, owner-approved 2026-09-26): one agent turn, streamed
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* to every view as VERBATIM pi AgentEvents — no translation, no remapping, no
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* part assembly. The SSE body is the agent's own event stream:
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* to every view as pi AgentEvents — no translation, no part assembly. The one
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* sanctioned rewrite (the Lacan fix, 2026-10-04): tool-call IDs uniquify at
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* this boundary when the provider resets them per response (DeepSeek's
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* `call_0` every turn) — see call-ids.ts and PiTurnSpec.usedToolCallIds.
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* The SSE body is the agent's own event stream:
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*
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* data: {"type":"agent_start"}\n\n
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* data: {"type":"message_update","message":{…},"assistantMessageEvent":{…}}\n\n
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@@ -57,6 +61,14 @@ export interface PiTurnSpec {
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* Receives the agent's FULL final state (native messages) — the caller
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* persists the slice past its own base count. */
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onFinish: (messages: AgentMessage[], isAborted: boolean) => void;
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/** Tool-call ids already used in this chat's record (THE LACAN FIX,
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* owner-approved 2026-10-04): when present, a ToolCallIdUniquifier
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* sits at this boundary — providers that reset ids every response
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* (DeepSeek's `call_0` × every turn) get colliding ids reminted ONCE
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* here, so wire views, the persisted record, the dock, answer
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* routing, and the next turn's provider context all agree. Absent →
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* verbatim passthrough (the protocol law below still holds). */
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usedToolCallIds?: ReadonlySet<string>;
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}
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/** One view onto a running turn: push() replays/streams an event, done()
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@@ -82,7 +94,8 @@ export interface PiTurnHandle {
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}
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export function runPiTurn(spec: PiTurnSpec): PiTurnHandle {
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const { agent, onError, onFinish } = spec;
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const { agent, onError, onFinish, usedToolCallIds } = spec;
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const uniquifier = usedToolCallIds ? new ToolCallIdUniquifier(usedToolCallIds) : undefined;
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let settled = false;
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let sawAbort = false;
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@@ -123,15 +136,14 @@ export function runPiTurn(spec: PiTurnSpec): PiTurnHandle {
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// messages of its own (the prompt is composed per turn), so dropping
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// the role wholesale is exact; revisit if prompt-updates ever land.
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const settleWith = () => {
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onFinish(
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[...agent.state.messages].filter((m) => (m as { role?: string }).role !== "system"),
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sawAbort,
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);
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const settled_ = [...agent.state.messages].filter((m) => (m as { role?: string }).role !== "system");
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onFinish((uniquifier?.remapSettled(settled_) as AgentMessage[]) ?? settled_, sawAbort);
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};
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const handle = (event: AgentEvent) => {
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// VERBATIM: every pi AgentEvent forwards as-is — no remapping.
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send(event);
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// THE LACAN FIX: ids uniquify HERE, before any view — the one seam
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// every consumer downstream shares. No uniquifier → verbatim.
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send(uniquifier ? uniquifier.event(event) : event);
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if (event.type === "message_end") {
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const m = event.message as { role?: string; stopReason?: string } | undefined;
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if (m?.role === "assistant" && m.stopReason === "aborted") sawAbort = true;
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