return `${cappedBody}${suffix}`;

}

function resolveSummaryReserveTokens(

requestedReserveTokens: number,

model: NonNullable<Parameters<typeof summarizeInStages>[0]["model"]>,

): number {

const requested = Math.max(1, Math.floor(requestedReserveTokens));

const modelMaxTokens = model.maxTokens;

if (

typeof modelMaxTokens !== "number" ||

!Number.isFinite(modelMaxTokens) ||

modelMaxTokens <= 0

) {

return requested;

}

return Math.max(1, Math.min(requested, Math.floor(modelMaxTokens)));

}

function extractMessageText(message: AgentMessage): string {

const content = (message as { content?: unknown }).content;

if (typeof content === "string") {

apiKey,

headers,

signal,

reserveTokens: Math.max(1, Math.floor(preparation.settings.reserveTokens)),

reserveTokens: resolveSummaryReserveTokens(

preparation.settings.reserveTokens,

model,

),

maxChunkTokens: droppedMaxChunkTokens,

contextWindow: contextWindowTokens,

customInstructions: structuredInstructions,

1,

Math.floor(contextWindowTokens * adaptiveRatio) - SUMMARIZATION_OVERHEAD_TOKENS,

);

const reserveTokens = Math.max(1, Math.floor(preparation.settings.reserveTokens));

const reserveTokens = resolveSummaryReserveTokens(preparation.settings.reserveTokens, model);

// Feed dropped-messages summary as previousSummary so the main summarization

// incorporates context from pruned messages instead of losing it entirely.