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06671aa | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | import type { ChatMessage, DocIndex } from "../chatTools";
import type {
AssistantRoutingContextV2,
AssistantSurface,
FocusedDocumentExcerpt,
} from "./types";
import type { RequestedAssistantMode } from "./requestedMode";
import { detectMutationIntentHint } from "./mutationHint";
export const CONTEXT_RECENT_MESSAGE_MAX = 2;
export const CONTEXT_RECENT_MESSAGE_CHAR_LIMIT = 800;
export const CONTEXT_LATEST_MESSAGE_CHAR_LIMIT = 12_000;
export const CONTEXT_FOCUSED_EXCERPT_CHAR_LIMIT = 4_000;
function truncate(value: string, max: number): string {
if (value.length <= max) return value;
return value.slice(0, max);
}
function fileTypeFor(filename: string, known?: string): string | null {
if (known && typeof known === "string") return known;
const lower = (filename || "").toLowerCase();
const ext = lower.slice(lower.lastIndexOf(".") + 1);
if (!ext || ext === lower) return null;
return ext;
}
function isEditable(fileType: string | null): boolean {
return fileType === "docx";
}
interface ContextDocInput {
documentId: string;
filename: string;
}
/**
* Build the bounded, sanitized routing context. Contains only metadata safe to
* send to a read-only router model: latest user message, at most two recent
* conversation messages (truncated), filenames/file types/editable flags, and
* optionally a focused excerpt the user pasted/quoted or selected in the UI.
*
* Never includes: signed URLs, storage paths, database rows, comments, full
* document bodies, tool results, or secrets.
*/
export function buildAssistantRoutingContext(params: {
surface: AssistantSurface;
requestedMode: RequestedAssistantMode;
messages: ChatMessage[];
docIndex: DocIndex;
displayedDocument?: ContextDocInput | null;
attachedDocuments?: ContextDocInput[];
projectDocumentCount?: number;
selectedWorkflow?: { workflowId: string; title: string } | null;
focusedDocumentExcerpt?: FocusedDocumentExcerpt | null;
confirmationPresented?: boolean;
}): AssistantRoutingContextV2 {
const {
surface,
requestedMode,
messages,
docIndex,
displayedDocument = null,
attachedDocuments = [],
projectDocumentCount = 0,
selectedWorkflow = null,
focusedDocumentExcerpt = null,
confirmationPresented = false,
} = params;
// Latest user message only.
const latestUser =
[...messages].reverse().find((m) => m.role === "user") ?? null;
const latestUserMessage = truncate(
latestUser?.content ?? "",
CONTEXT_LATEST_MESSAGE_CHAR_LIMIT,
);
// At most two recent conversation messages for reference resolution.
const recentConversation: AssistantRoutingContextV2["recentConversation"] = [];
const trimmed = messages.slice(-CONTEXT_RECENT_MESSAGE_MAX - 1);
for (const m of trimmed) {
if (m.role !== "user" && m.role !== "assistant") continue;
recentConversation.push({
role: m.role,
content: truncate(m.content ?? "", CONTEXT_RECENT_MESSAGE_CHAR_LIMIT),
});
if (recentConversation.length >= CONTEXT_RECENT_MESSAGE_MAX) break;
}
function resolveDoc(input: ContextDocInput) {
const entry = docIndex[input.documentId];
const filename = entry?.filename ?? input.filename;
const fileType = fileTypeFor(filename, entry?.file_type);
return {
documentId: input.documentId,
filename,
fileType,
editable: isEditable(fileType),
revisionId: entry?.version_id ?? null,
};
}
const displayedDocumentResolved = displayedDocument
? resolveDoc(displayedDocument)
: null;
const attachedDocumentsResolved = attachedDocuments.map(resolveDoc);
// Focused excerpt only when pasted/quoted by the user or selected in UI,
// capped, never scanned from a document body.
let focused: FocusedDocumentExcerpt | null = null;
if (focusedDocumentExcerpt && focusedDocumentExcerpt.text) {
focused = {
documentId: focusedDocumentExcerpt.documentId,
text: truncate(
focusedDocumentExcerpt.text,
CONTEXT_FOCUSED_EXCERPT_CHAR_LIMIT,
),
source: focusedDocumentExcerpt.source,
};
}
return {
schemaVersion: 2,
surface,
requestedMode,
currentDate: new Date().toISOString().slice(0, 10),
latestUserMessage,
recentConversation,
displayedDocument: displayedDocumentResolved,
attachedDocuments: attachedDocumentsResolved,
projectDocumentCount,
selectedWorkflow,
focusedDocumentExcerpt: focused,
mutationIntentHint: detectMutationIntentHint(latestUserMessage),
confirmationPresented,
};
}
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