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fix(desktop): separate system prompt from turn context (#1754)

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Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@sprout-oss.stage.blox.sqprod.co>
This commit is contained in:
Will Pfleger
2026-07-11 13:40:16 -04:00
committed by GitHub
parent 3b9b371f87
commit 84ec63aa24
10 changed files with 1306 additions and 251 deletions
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100
desktop/src/features/agents/ui/agentSessionTranscriptHelpers.ts
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@@ -56,42 +56,94 @@ export function parsePromptText(text: string): {
}
/**
* Split the framed `session/new` `systemPrompt` into its `Base`/`System`
* sub-sections deterministically.
* Split the framed `session/new` `systemPrompt` into its `Base`/`System`/
* `Core Memory`/`Channel Canvas` sub-sections deterministically.
*
* The harness frames the value as `[Base]\n{base}\n\n[System]\n{persona}`, with
* either prompt omitted when absent: base-only is `[Base]\n{base}`, persona-only
* is `[System]\n{persona}`. We partition on the FIRST `\n[System]\n` boundary and
* read each labeled body literally. Unlike the generic `parsePromptSections`,
* embedded `[...]` lines inside a body never start a new section — so a persona
* containing a bracketed line, or a mid-string-elided header on an oversize
* prompt, can never drop a label or inflate the section count.
* The harness composes the value in order:
* `[Base]\n{base}\n\n[System]\n{persona}\n\n[Agent Memory — core]\n{core}\n\n[Channel Canvas]\n{canvas}`
* with any section omitted when absent. Extraction runs in reverse producer
* order so that each `lastIndexOf` search operates on the full input and
* each extraction boundary is unambiguous.
*
* Three extraction passes before Base/System parsing:
*
* 1. **Canvas** (`[Channel Canvas]`): appended last by `with_canvas()`.
* - Start-of-string: canvas-only input.
* - Appended frame (`\n\n[Channel Canvas]\n`): blank-line separator used by
* `with_canvas()`; LAST occurrence guards against an embedded header in a
* persona body (single preceding newline only).
*
* 2. **Core** (`[Agent Memory — core]`): appended before canvas by `with_core()`.
* Same two cases, same last-occurrence guard.
*
* 3. **Base/System**: remainder after canvas and core extraction.
* Split on the first `\n[System]\n` boundary; no embedded `[...]` line
* inside a body can start a new section.
*/
export function parseSystemPromptSections(
systemPrompt: string,
): PromptSection[] {
const sections: PromptSection[] = [];
// Persona-only frame: no [Base], starts directly with [System].
if (systemPrompt.startsWith("[System]\n")) {
const body = systemPrompt.slice("[System]\n".length).trim();
if (body) sections.push({ title: "System", body });
return sections;
// ── 1. Extract [Channel Canvas] ───────────────────────────────────────────
const CANVAS_HEADER = "[Channel Canvas]";
const CANVAS_MARKER_INLINE = `\n\n${CANVAS_HEADER}\n`;
let canvasBody: string | null = null;
let remainder = systemPrompt;
if (remainder.startsWith(`${CANVAS_HEADER}\n`)) {
canvasBody = remainder.slice(`${CANVAS_HEADER}\n`.length).trim();
remainder = "";
} else {
const lastCanvas = remainder.lastIndexOf(CANVAS_MARKER_INLINE);
if (lastCanvas !== -1) {
canvasBody = remainder
.slice(lastCanvas + CANVAS_MARKER_INLINE.length)
.trim();
remainder = remainder.slice(0, lastCanvas);
}
}
// Otherwise the head (up to the first [System] boundary, or the whole string)
// is the [Base] body.
const marker = "\n[System]\n";
const at = systemPrompt.indexOf(marker);
const head = at === -1 ? systemPrompt : systemPrompt.slice(0, at);
const baseBody = head.replace(/^\[Base]\n/, "").trim();
if (baseBody) sections.push({ title: "Base", body: baseBody });
// ── 2. Extract [Agent Memory — core] ──────────────────────────────────────
const CORE_HEADER = "[Agent Memory — core]";
const CORE_MARKER_INLINE = `\n\n${CORE_HEADER}\n`;
let coreBody: string | null = null;
if (at !== -1) {
const systemBody = systemPrompt.slice(at + marker.length).trim();
sections.push({ title: "System", body: systemBody });
if (remainder.startsWith(`${CORE_HEADER}\n`)) {
coreBody = remainder.slice(`${CORE_HEADER}\n`.length).trim();
remainder = "";
} else {
const lastCore = remainder.lastIndexOf(CORE_MARKER_INLINE);
if (lastCore !== -1) {
coreBody = remainder.slice(lastCore + CORE_MARKER_INLINE.length).trim();
remainder = remainder.slice(0, lastCore);
}
}
// ── 3. Parse Base/System from the remaining prefix ────────────────────────
const baseAndSystem = remainder;
if (baseAndSystem) {
if (baseAndSystem.startsWith("[System]\n")) {
const body = baseAndSystem.slice("[System]\n".length).trim();
if (body) sections.push({ title: "System", body });
} else {
const marker = "\n[System]\n";
const at = baseAndSystem.indexOf(marker);
const head = at === -1 ? baseAndSystem : baseAndSystem.slice(0, at);
const baseBody = head.replace(/^\[Base]\n/, "").trim();
if (baseBody) sections.push({ title: "Base", body: baseBody });
if (at !== -1) {
const systemBody = baseAndSystem.slice(at + marker.length).trim();
if (systemBody) sections.push({ title: "System", body: systemBody });
}
}
}
// ── 4. Append core and canvas sections in producer order ──────────────────
if (coreBody) sections.push({ title: "Core Memory", body: coreBody });
if (canvasBody) sections.push({ title: "Channel Canvas", body: canvasBody });
return sections;
}