Pi-style ack-and-steer sub-agent protocol: dispatch mid-turn, steer via server wake turn

The job tools (research/demo/visual) switch from client-side turn-breaking
calls to pi's model: execute resolves IMMEDIATELY with a fire-and-forget
ack, the teacher's turn continues, and the result arrives later as an
injected user-role steer message that wakes the teacher in a new
server-side turn.

- contracts.ts: THE ASYNC PROTOCOL rewritten (ack now, steer later); steer
  types (SubagentSteerMessage, metadata.subagentResult + data-subagent-
  artifact part), pure buildSubagentSteer/steerDelivered/isSubagentFailure
- tools/jobs.ts: jobTools(ctx) factory — server-side execute creates the
  job (deduped by toolCallId), fires spawn with the dispatch-time input
  (the part isn't persisted yet at execute — a transcript scan would race)
- runner.ts: runJob(jobId, input?) builds the steer and hands it to the
  injected deliver seam; pipeline owns the done/error flip (a polling
  client re-syncs once, at the end); failures still steer
- server/jobs.ts (new pipeline): per-chat serialized queues on globalThis,
  idle gates (turn liveness + pending question, 1.5s grace), 409 retry
  with backoff, idempotent per jobId, stale-job recovery sweep (re-deliver
  or re-spawn); wake turns run through the same handleChatRequest
  composition via setTurnRunner injection
- chat-handler.ts: wires runner+deliver+tools ctx; drops spawnTurnJobs
  from onFinish; teacher default registry = question tools only
- plan.ts: PlanToolContext split out (plan tools need no job wiring)
- visual-maker: edit_svg added (pi parity — exact-match single
  replacement, fuzzy context on a miss); researcher: pi's kept/dropped
  source accounting restored
- prompts 20-jobs/40-demos: async discipline rewritten (announce and keep
  teaching, no waiting/polling/fabricating, parallel dispatch, teach with
  the artifact when it arrives)
- tests: jobs.test.ts rewritten (dispatch ack mid-turn, runner steers,
  wake pipeline: deferral/409/idempotency/failure), demos.test.tsx runner
  tests ported to runJob + fake deliver; 222 green

FLAGGED surgical touches outside the stream's owned files, for master
review at merge: src/core/contracts.ts (protocol doc + steer types),
src/core/ui-message.ts (job tool + data-part types), src/server/
chat-handler.ts (wiring), src/server/turn-service.ts (spawnTurnJobs
retirement), src/agent/teacher-agent.ts (default tools), src/agent/tools/
plan.ts (context type split).

Verified live on PORT=3003 with real models: teacher dispatched research
mid-turn, researcher ran real searches/fetches, steer injected on quiz
answer, wake turn wove the brief in citing its sources, job flipped done;
a client/wake race correctly 409'd.
This commit is contained in:
Amos
2026-09-01 19:15:43 +03:00
parent cf3225fb23
commit 99fa3f0847
16 changed files with 1382 additions and 429 deletions
+2 -1
View File
@@ -51,7 +51,8 @@ Numbered findings with inline source citations:
1. **Finding** — explanation. [Source](url)
## Sources
- Source Title (url) — why it's relevant
- Kept: Source Title (url) — why relevant
- Dropped: Source Title — why excluded
## Gaps
What couldn't be answered. Suggested next steps.`;
+163 -163
View File
@@ -1,107 +1,168 @@
import { isToolUIPart, type LanguageModel, type UIMessage } from "ai";
import type { DemoResult, DemoToolInput, JobKind, ResearchResult, ResearchToolInput, VisualResult, VisualToolInput } from "../../core/contracts.ts";
import { JOB_TOOLS } from "../../core/pending.ts";
import {
buildSubagentSteer,
type DemoResult,
type DemoToolInput,
type JobKind,
type JobRecord,
type ResearchResult,
type ResearchToolInput,
type SubagentSteerMessage,
type VisualResult,
type VisualToolInput,
} from "../../core/contracts.ts";
import type { ChatStore, JobStore } from "../../core/ports.ts";
import { runDemoBuilder } from "./demo-builder.ts";
import { createResearcherAgent } from "./researcher.ts";
import { runVisualMaker } from "./visual-maker.ts";
/**
* The background job runner (contracts.ts "THE ASYNC PROTOCOL"), created via
* createJobRunner({ chatStore, jobStore }) — the composition root (chat-handler)
* injects the storage ports; this module never imports an adapter.
* The background job runner (contracts.ts "THE ASYNC PROTOCOL" §2–3), created
* via createJobRunner({ chatStore, jobStore, deliver }) — the composition root
* (chat-handler) injects the storage ports and the WAKE SEAM (the server-side
* steer delivery, src/server/jobs.ts); this module never imports an adapter.
*
* spawnPendingJobs — called from the turn service AFTER persist: finds
* input-available JOB_TOOLS parts in the last assistant message with no
* existing job and fires the kind's runner WITHOUT awaiting (the HTTP
* response is long gone). Kind dispatch (research/demo/visual) is a
* self-contained map here, so no caller changes for new job kinds —
* anything listed in JOB_TOOLS routes automatically.
* runJob(jobId) — runs the kind's sub-agent loop in the background
* (the job tools' execute fires this via the spawn seam, fire-and-forget),
* updating the job's activity line on every iteration. On completion the
* runner builds the STEER MESSAGE (buildSubagentSteer) and hands it to
* `deliver`; the wake pipeline fires the server-side teacher turn and
* flips the job to done/error when the lesson has actually resumed.
*
* runResearchJob / runDemoJob / runVisualJob — run the sub-agent loop in
* the background, updating the job's activity line on every iteration,
* then rewrite the tool part in the LATEST chat record to
* output-available (read-modify-write; no awaits between the read and
* the write). The part is fulfilled BEFORE the job status flips, so a
* client that polls the job and then re-syncs always sees the finished
* part.
*
* On failure the part is still fulfilled (DemoResult/VisualResult failure
* shape: empty html/svg + "FAILED: …" notes; research: failure brief) — the
* teacher must learn the outcome — and the job is marked error.
* On failure the result is the failure shape (empty html/svg + "FAILED: …"
* notes; research: failure brief) — and it STILL steers, because the
* teacher must learn the outcome. If delivery itself fails, the job is
* marked error (the learner's activity card shows it).
*/
/**
* Test seam: the spawn hook creates runners with no injection point, so
* tests swap in a MockLanguageModelV4 here to keep job tests off the
* network. Undefined in production.
* Test seam: the spawn wiring has no injection point at the tool layer, so
* tests swap in a MockLanguageModelV4 here to keep job tests off the network.
* Undefined in production. (The jobs spawn through the module-level KIND
* runners, which read these at call time.)
*/
export const researchModelOverride: { current?: LanguageModel } = {};
export const demoModelOverride: { current?: LanguageModel } = {};
export const visualModelOverride: { current?: LanguageModel } = {};
/** The dispatch-time tool input (from src/agent/tools/jobs.ts schemas). */
type JobToolInput = ResearchToolInput | DemoToolInput | VisualToolInput;
export interface JobRunnerDeps {
chatStore: ChatStore;
jobStore: JobStore;
}
export interface RunResearchJobOptions {
model?: LanguageModel;
}
export interface RunDemoJobOptions {
model?: LanguageModel;
}
export interface RunVisualJobOptions {
model?: LanguageModel;
/**
* Hand a finished job's steer to the wake pipeline — resolves when the
* steer is delivered (the wake turn completed and the job status
* flipped); rejects when delivery fails unrecoverably.
*/
deliver: (steer: SubagentSteerMessage) => Promise<void>;
}
export interface JobRunner {
spawnPendingJobs(chatId: string, messages: UIMessage[]): void;
runResearchJob(jobId: string, opts?: RunResearchJobOptions): Promise<void>;
runDemoJob(jobId: string, opts?: RunDemoJobOptions): Promise<void>;
runVisualJob(jobId: string, opts?: RunVisualJobOptions): Promise<void>;
/** Run one job's sub-agent loop to completion (background; never throws).
* The tool input rides along from dispatch (the spawn fires mid-stream,
* before the tool part is persisted — only crash-recovery re-spawns
* resolve the input from the transcript). */
runJob(jobId: string, input?: ResearchToolInput | DemoToolInput | VisualToolInput): Promise<void>;
}
export function createJobRunner(deps: JobRunnerDeps): JobRunner {
const { chatStore, jobStore } = deps;
const { chatStore, jobStore, deliver } = deps;
/** The kind→runner map: everything in JOB_TOOLS routes through here. */
const KIND_RUNNERS: Record<JobKind, (jobId: string) => Promise<void>> = {
research: (jobId) => runResearchJob(jobId, { model: researchModelOverride.current }),
demo: (jobId) => runDemoJob(jobId, { model: demoModelOverride.current }),
visual: (jobId) => runVisualJob(jobId, { model: visualModelOverride.current }),
/** The kind→runner map: one sub-agent loop per job kind. */
// Each kind's runner narrows the union input itself (dispatch-time inputs
// are kind-correct by construction; transcript fallbacks are cast after).
const KIND_RUNNERS: Record<JobKind, (jobId: string, input?: JobToolInput) => Promise<void>> = {
research: (jobId, input) => runResearchJob(jobId, researchModelOverride.current, input),
demo: (jobId, input) => runDemoJob(jobId, demoModelOverride.current, input),
visual: (jobId, input) => runVisualJob(jobId, visualModelOverride.current, input),
};
function spawnPendingJobs(chatId: string, messages: UIMessage[]): void {
const last = [...messages].reverse().find((m) => m.role === "assistant");
if (!last) return;
for (const part of last.parts) {
if (!isToolUIPart(part) || part.state !== "input-available") continue;
const tool = part.type.slice("tool-".length);
if (!(JOB_TOOLS as readonly string[]).includes(tool)) continue;
const runner = KIND_RUNNERS[tool as JobKind];
if (!runner) continue;
if (jobStore.findJobByToolCallId(chatId, part.toolCallId)) continue; // already has a job
const job = jobStore.createJob({ kind: tool as JobKind, chatId, toolCallId: part.toolCallId });
void runner(job.id).catch((err) => {
console.error(`[job ${job.id}] ${tool} runner crashed:`, err);
jobStore.updateJob(job.id, { status: "error", error: String(err), activity: "failed" });
});
async function runJob(jobId: string, input?: JobToolInput): Promise<void> {
const job = jobStore.getJob(jobId);
if (!job) {
console.error(`[job ${jobId}] not found — nothing to run`);
return;
}
if (job.status !== "running") return; // already finished / re-run after crash recovery
const run = KIND_RUNNERS[job.kind];
if (!run) {
console.error(`[job ${jobId}] unknown kind: ${job.kind}`);
jobStore.updateJob(jobId, { status: "error", error: `unknown kind ${job.kind}`, activity: "failed" });
return;
}
await run(jobId, input);
}
/** Resolve the job's tool input: dispatch passes it directly; only a
* crash-recovery re-spawn (no input) falls back to scanning the
* transcript (by then onFinish has long persisted the part). */
function resolveInput(
job: JobRecord,
input: JobToolInput | undefined,
): ResearchToolInput | DemoToolInput | VisualToolInput | undefined {
if (input) return input;
const chat = chatStore.getChat(job.chatId);
if (!chat) return undefined;
return (findToolPart(chat.messages, job.toolCallId)?.input ?? undefined) as
| ResearchToolInput
| DemoToolInput
| VisualToolInput
| undefined;
}
// ─── shared plumbing ────────────────────────────────────────────────────
function findToolPart(messages: UIMessage[], toolCallId: string) {
for (const m of messages) {
for (const part of m.parts) {
if (isToolUIPart(part) && part.toolCallId === toolCallId) return part;
}
}
return null;
}
/**
* The tail of every job: store the result, build the steer, hand it to
* the wake pipeline. The pipeline flips the status when the lesson has
* actually resumed — until then the job reads "running" so the client's
* activity card keeps polling and re-syncs once, at the end.
*/
async function finishJob(jobId: string, result: ResearchResult | DemoResult | VisualResult): Promise<void> {
const job = jobStore.getJob(jobId);
if (!job) return;
jobStore.updateJob(jobId, { result, activity: "delivering result" });
const steer = buildSubagentSteer(job, result);
try {
await deliver(steer);
} catch (err) {
const reason = err instanceof Error ? err.message : String(err);
console.error(`[job ${jobId}] steer delivery failed:`, err);
jobStore.updateJob(jobId, { status: "error", error: reason, activity: "delivery failed" });
}
}
async function runResearchJob(jobId: string, opts: RunResearchJobOptions = {}): Promise<void> {
/** Chat-record + input resolution shared by all three runners. */
function jobContext(jobId: string): { job: JobRecord; chatId: string } | null {
const job = jobStore.getJob(jobId);
if (!job || job.status !== "running") return;
if (!job || job.status !== "running") return null;
const chat = chatStore.getChat(job.chatId);
if (!chat) {
jobStore.updateJob(jobId, { status: "error", error: `Chat not found: ${job.chatId}`, activity: "failed" });
return;
return null;
}
const input = findToolPart(chat.messages, job.toolCallId)?.input as ResearchToolInput | undefined;
return { job, chatId: job.chatId };
}
// ─── research ───────────────────────────────────────────────────────────
async function runResearchJob(jobId: string, model?: LanguageModel, passedInput?: JobToolInput): Promise<void> {
const ctx = jobContext(jobId);
if (!ctx) return;
const { job } = ctx;
const input = (passedInput ?? resolveInput(job, passedInput)) as ResearchToolInput | undefined;
const question = typeof input?.question === "string" && input.question.trim() ? input.question : "(no question)";
const context = typeof input?.context === "string" && input.context.trim() ? input.context : undefined;
@@ -114,7 +175,7 @@ export function createJobRunner(deps: JobRunnerDeps): JobRunner {
.join("\n\n");
const fetchedUrls: string[] = [];
const agent = createResearcherAgent(opts.model);
const agent = createResearcherAgent(model);
try {
jobStore.updateJob(jobId, { activity: "researching" });
@@ -132,37 +193,22 @@ export function createJobRunner(deps: JobRunnerDeps): JobRunner {
const brief = result.text.trim();
if (!brief) throw new Error("the researcher produced no text");
const research: ResearchResult = { brief, sources: parseSources(brief, fetchedUrls) };
fulfillPart(job.chatId, job.toolCallId, research);
jobStore.updateJob(jobId, { status: "done", result: research }); // activity line kept: the last tool call is the record
await finishJob(jobId, research);
} catch (err) {
const reason = err instanceof Error ? err.message : String(err);
fulfillPart(job.chatId, job.toolCallId, { brief: `Research failed: ${reason}`, sources: [] });
jobStore.updateJob(jobId, { status: "error", activity: "failed", error: reason });
jobStore.updateJob(jobId, { error: reason });
await finishJob(jobId, { brief: `Research failed: ${reason}`, sources: [] });
}
}
// ─── demo + visual job wrappers ───────────────────────────────────────────
// ─── demo + visual ──────────────────────────────────────────────────────
/** Failure shape (W6 brief): html === "" with "FAILED: …" notes. */
function isDemoFailure(result: DemoResult): boolean {
return typeof result.html !== "string" || result.html.length === 0;
}
async function runDemoJob(jobId: string, model?: LanguageModel, passedInput?: JobToolInput): Promise<void> {
const ctx = jobContext(jobId);
if (!ctx) return;
const { job } = ctx;
function isVisualFailure(result: VisualResult): boolean {
return typeof result.svg !== "string" || result.svg.length === 0;
}
async function runDemoJob(jobId: string, opts: RunDemoJobOptions = {}): Promise<void> {
const job = jobStore.getJob(jobId);
if (!job || job.status !== "running") return;
const chat = chatStore.getChat(job.chatId);
if (!chat) {
jobStore.updateJob(jobId, { status: "error", error: `Chat not found: ${job.chatId}`, activity: "failed" });
return;
}
const input = findToolPart(chat.messages, job.toolCallId)?.input as DemoToolInput | undefined;
const input = (passedInput ?? resolveInput(job, passedInput)) as DemoToolInput | undefined;
const title = typeof input?.title === "string" && input.title.trim() ? input.title : "Interactive demo";
const brief = typeof input?.brief === "string" ? input.brief : "";
@@ -171,34 +217,25 @@ export function createJobRunner(deps: JobRunnerDeps): JobRunner {
const result = await runDemoBuilder(
{ title, brief },
{
model: opts.model,
model,
onActivity: (line) => jobStore.updateJob(jobId, { activity: line }),
},
);
fulfillPart(job.chatId, job.toolCallId, result);
if (isDemoFailure(result)) {
jobStore.updateJob(jobId, { status: "error", error: result.notes ?? "demo build failed", activity: "failed" });
} else {
jobStore.updateJob(jobId, { status: "done", result });
}
if (isDemoFailure(result)) jobStore.updateJob(jobId, { error: result.notes ?? "demo build failed" });
await finishJob(jobId, result);
} catch (err) {
const reason = err instanceof Error ? err.message : String(err);
const failure: DemoResult = { title, html: "", tested: true, notes: `FAILED: ${reason}` };
fulfillPart(job.chatId, job.toolCallId, failure);
jobStore.updateJob(jobId, { status: "error", error: reason, activity: "failed" });
jobStore.updateJob(jobId, { error: reason });
await finishJob(jobId, { title, html: "", tested: true, notes: `FAILED: ${reason}` });
}
}
async function runVisualJob(jobId: string, opts: RunVisualJobOptions = {}): Promise<void> {
const job = jobStore.getJob(jobId);
if (!job || job.status !== "running") return;
async function runVisualJob(jobId: string, model?: LanguageModel, passedInput?: JobToolInput): Promise<void> {
const ctx = jobContext(jobId);
if (!ctx) return;
const { job } = ctx;
const chat = chatStore.getChat(job.chatId);
if (!chat) {
jobStore.updateJob(jobId, { status: "error", error: `Chat not found: ${job.chatId}`, activity: "failed" });
return;
}
const input = findToolPart(chat.messages, job.toolCallId)?.input as VisualToolInput | undefined;
const input = (passedInput ?? resolveInput(job, passedInput)) as VisualToolInput | undefined;
const brief = typeof input?.brief === "string" ? input.brief : "";
try {
@@ -206,70 +243,33 @@ export function createJobRunner(deps: JobRunnerDeps): JobRunner {
const result = await runVisualMaker(
{ brief },
{
model: opts.model,
model,
onActivity: (line) => jobStore.updateJob(jobId, { activity: line }),
},
);
fulfillPart(job.chatId, job.toolCallId, result);
if (isVisualFailure(result)) {
jobStore.updateJob(jobId, { status: "error", error: result.notes ?? "visual build failed", activity: "failed" });
} else {
jobStore.updateJob(jobId, { status: "done", result });
}
if (isVisualFailure(result)) jobStore.updateJob(jobId, { error: result.notes ?? "visual build failed" });
await finishJob(jobId, result);
} catch (err) {
const reason = err instanceof Error ? err.message : String(err);
const failure: VisualResult = { svg: "", notes: `FAILED: ${reason}` };
fulfillPart(job.chatId, job.toolCallId, failure);
jobStore.updateJob(jobId, { status: "error", error: reason, activity: "failed" });
jobStore.updateJob(jobId, { error: reason });
await finishJob(jobId, { svg: "", notes: `FAILED: ${reason}` });
}
}
// ─── helpers ─────────────────────────────────────────────────────────────
function findToolPart(messages: UIMessage[], toolCallId: string) {
for (const m of messages) {
for (const part of m.parts) {
if (isToolUIPart(part) && part.toolCallId === toolCallId) return part;
}
}
return null;
}
/**
* Rewrite the tool part in the LATEST chat record to output-available.
* Synchronous read-modify-write (no awaits) — atomic within the event loop.
*/
function fulfillPart(chatId: string, toolCallId: string, output: ResearchResult | DemoResult | VisualResult): void {
const chat = chatStore.getChat(chatId);
if (!chat) return;
let found = false;
const messages = chat.messages.map((m) =>
m.role !== "assistant"
? m
: {
...m,
parts: m.parts.map((part) => {
if (isToolUIPart(part) && part.toolCallId === toolCallId && part.state === "input-available") {
found = true;
return { ...part, state: "output-available" as const, output };
}
return part;
}),
},
);
if (!found) return;
try {
chatStore.saveMessages(chatId, messages);
} catch (err) {
console.error(`[chat ${chatId}] fulfilling job part ${toolCallId} failed:`, err);
}
}
return { spawnPendingJobs, runResearchJob, runDemoJob, runVisualJob };
return { runJob };
}
// ─── module-level pure helpers ──────────────────────────────────────────────
/** Failure shape (W6 brief): html === "" with "FAILED: …" notes. */
function isDemoFailure(result: DemoResult): boolean {
return typeof result.html !== "string" || result.html.length === 0;
}
function isVisualFailure(result: VisualResult): boolean {
return typeof result.svg !== "string" || result.svg.length === 0;
}
/** The activity line shown in the UI: `web_search: "query"` / `web_fetch: host`. */
function activityLine(toolName: string, input: { query?: string; url?: string } | undefined): string {
if (toolName === "web_search") return `web_search: "${input?.query ?? ""}"`;
+70 -4
View File
@@ -49,8 +49,11 @@ composition, and above everything CORRECTNESS: the picture must not assert anyth
mark on the wrong corner, a vector pointing the wrong way, a point plotted at the wrong coordinate is a
failure even if it renders cleanly.
Your two tools:
Your three tools:
- write_svg({ svg }) — write the complete <svg>…</svg> source (overwrites the previous version).
- edit_svg({ old_text, new_text }) — a surgical exact-match replacement in the current SVG:
old_text must appear EXACTLY ONCE; it is replaced by new_text. Call write_svg first. For anything
beyond a one-spot fix (new elements, restructured layout), write_svg the whole document again.
- render_svg({}) — rasterize the current SVG in headless Chrome. The render arrives as an image in the
message right after the tool result.
@@ -64,8 +67,8 @@ says nothing about whether the geometry is right or the picture is readable. Whe
- Would a learner instantly read the intended idea from this picture alone?
Workflow: plan the coordinate space (viewBox + margins, nothing touching the edges) → write_svg →
render_svg → LOOK critically → fix (write_svg) and re-render until correct and clean. Never finish
without having looked at a render of your FINAL SVG.
render_svg → LOOK critically → fix (edit_svg for one-spot fixes, write_svg otherwise) and re-render
until correct and clean. Never finish without having looked at a render of your FINAL SVG.
SVG requirements:
- A complete <svg> with explicit width/height AND a matching viewBox.
@@ -86,6 +89,14 @@ export function createVisualTools() {
svg: z.string().describe('Complete <svg xmlns="…">…</svg> markup.'),
}),
}),
edit_svg: tool({
description:
"Replace one exact spot in the current SVG: old_text must appear EXACTLY ONCE and is replaced by new_text. Call write_svg first. For larger changes, write_svg the whole document.",
inputSchema: z.object({
old_text: z.string().describe("The exact text to replace — must match exactly once in the current SVG."),
new_text: z.string().describe("The replacement text."),
}),
}),
render_svg: tool({
description: "Render the current SVG to a PNG and show it to you for inspection. No arguments.",
inputSchema: z.object({}),
@@ -164,6 +175,36 @@ export async function runVisualMaker(input: VisualMakerInput, opts: VisualMakerO
currentSvg = svg;
opts.onActivity?.(`write_svg: ${(svg.length / 1024).toFixed(1)} KB`);
toolResults.push(toolText(call.toolCallId, call.toolName, `Saved (${svg.length} bytes). Call render_svg to look at it.`));
} else if (call.toolName === "edit_svg") {
const edit = call.input as { old_text?: unknown; new_text?: unknown };
if (!currentSvg) {
toolResults.push(toolText(call.toolCallId, call.toolName, "ERROR: nothing to edit — call write_svg first."));
continue;
}
if (typeof edit.old_text !== "string" || typeof edit.new_text !== "string" || !edit.old_text) {
toolResults.push(toolText(call.toolCallId, call.toolName, "ERROR: expected old_text (non-empty) and new_text strings."));
continue;
}
const occurrences = currentSvg.split(edit.old_text).length - 1;
if (occurrences === 0) {
toolResults.push(
toolText(
call.toolCallId,
call.toolName,
`ERROR: old_text not found. Closest line for reference:\n${snippetAround(currentSvg, edit.old_text)}`,
),
);
continue;
}
if (occurrences > 1) {
toolResults.push(
toolText(call.toolCallId, call.toolName, `ERROR: old_text appears ${occurrences} times — it must match EXACTLY ONCE. Include more surrounding context to make it unique.`),
);
continue;
}
currentSvg = currentSvg.replace(edit.old_text, edit.new_text);
opts.onActivity?.("edit_svg: applied");
toolResults.push(toolText(call.toolCallId, call.toolName, "OK — replaced 1 occurrence. Call render_svg to look at the edited SVG."));
} else if (call.toolName === "render_svg") {
if (!currentSvg) {
toolResults.push(toolText(call.toolCallId, call.toolName, "ERROR: nothing to render — call write_svg first."));
@@ -181,7 +222,7 @@ export async function runVisualMaker(input: VisualMakerInput, opts: VisualMakerO
toolResults.push(toolText(call.toolCallId, call.toolName, `RENDER ERROR (the SVG may be malformed): ${msg}. Fix it with write_svg and render again.`));
}
} else {
toolResults.push(toolText(call.toolCallId, call.toolName, `ERROR: unknown tool "${call.toolName}". Use write_svg or render_svg.`));
toolResults.push(toolText(call.toolCallId, call.toolName, `ERROR: unknown tool "${call.toolName}". Use write_svg, edit_svg, or render_svg.`));
}
}
// Message order: assistant tool-calls → tool results → render image.
@@ -215,6 +256,31 @@ function toolText(toolCallId: string, toolName: string, value: string): ToolResu
return { type: "tool-result", toolCallId, toolName, output: { type: "text", value } };
}
/** A 3-line numbered context window around the closest fuzzy match for a
* failed edit — enough for the model to see what went wrong and retry
* (the pi svg_tools snippetAround semantics). */
function snippetAround(svg: string, target: string): string {
const words = target.trim().split(/\s+/).filter(Boolean);
if (words.length === 0) return "(empty old_text)";
const lines = svg.split("\n");
let bestAt = -1;
let bestScore = -1;
for (let i = 0; i < lines.length; i++) {
const score = words.filter((w) => lines[i]!.includes(w)).length;
if (score > bestScore) {
bestScore = score;
bestAt = i;
}
}
if (bestAt < 0) return "(no similar line found)";
const from = Math.max(0, bestAt - 1);
const to = Math.min(lines.length, bestAt + 2);
return lines
.slice(from, to)
.map((line, idx) => `${from + idx + 1} | ${line}`)
.join("\n");
}
function finish(svg: string | null, finalText: string): VisualResult {
if (!svg) {
return {