File size: 7,499 Bytes
68d7816 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | import { z } from 'zod';
import { contextMemoryKey } from '#/agent/contextMemory/contextOps';
import type { ContextMessage } from '#/agent/contextMemory/types';
import type { ContextSize, TokenCountingStrategy } from '#/agent/tokenCounting/tokenCounting';
import {
anchorsEqual,
normalizeAnchorLength,
TokenCountingMeasured,
TokenCountingRebased,
TokenCountingTruncated,
TokenCountingTurnRecorded,
type TokenAnchor,
type TokenCountingState,
} from '#/agent/tokenCounting/tokenCountingOps';
import { AgentStatusUpdated } from '#/agent/usage/usageEvents';
import type { Message } from '#/llm-adapter/contract/message';
import { estimateTokensForMessages } from '#/llm-adapter/contract/tokens';
import type { TokenUsage } from '#human/llm/usage';
import { AgentModel, defineAgentModel, type AgentModelContext } from '#/state/agentModel';
import type { TokenCountingRebaseInput } from './sessionTokenCounting';
const ZERO_ANCHOR: TokenAnchor = { length: 0, tokens: 0, measured: true };
export class TokenCountingAgentModel extends AgentModel<TokenCountingState> {
constructor(context: AgentModelContext) {
super(context);
this.on(TokenCountingMeasured, (event) => {
const length = normalizeAnchorLength(event.length);
const tokens = Math.max(0, event.tokens);
const anchor: TokenAnchor = { length, tokens, measured: true };
const anchors = [...this.state.anchors.filter((a) => a.length < length), anchor];
if (!(this.state.tokens === tokens && anchorsEqual(this.state.anchors, anchors))) {
this.state.anchors = anchors;
this.state.tokens = tokens;
}
void this.emit(
new AgentStatusUpdated({ agentId: event.agentId, contextTokens: this.state.tokens }),
);
});
this.on(TokenCountingTruncated, (event) => {
const length = normalizeAnchorLength(event.length);
const tokens = Math.max(0, event.tokens);
const anchors = this.state.anchors.filter((a) => a.length <= length);
if (!(this.state.tokens === tokens && anchorsEqual(this.state.anchors, anchors))) {
this.state.anchors = anchors;
this.state.tokens = tokens;
}
void this.emit(
new AgentStatusUpdated({ agentId: event.agentId, contextTokens: this.state.tokens }),
);
});
this.on(TokenCountingRebased, (event) => {
const length = normalizeAnchorLength(event.length);
const tokens = Math.max(0, event.tokens);
const anchors: TokenAnchor[] = [{ length, tokens, measured: event.measured }];
if (!(this.state.tokens === tokens && anchorsEqual(this.state.anchors, anchors))) {
this.state.anchors = anchors;
this.state.tokens = tokens;
}
void this.emit(
new AgentStatusUpdated({ agentId: event.agentId, contextTokens: this.state.tokens }),
);
});
this.on(TokenCountingTurnRecorded, (event) => {
const length = normalizeAnchorLength(event.length);
const tokens = Math.max(0, event.tokens);
const pinned = this.state.anchors.some((anchor) => anchor.length === length);
const anchors = pinned
? this.state.anchors
: [
...this.state.anchors.filter((anchor) => anchor.length < length),
{ length, tokens, measured: false },
];
if (!(this.state.tokens === tokens && anchorsEqual(this.state.anchors, anchors))) {
this.state.anchors = anchors;
this.state.tokens = tokens;
}
void this.emit(
new AgentStatusUpdated({ agentId: event.agentId, contextTokens: this.state.tokens }),
);
});
}
get(start?: number, end?: number): ContextSize {
const context = this.context();
const from = normalizeSliceIndex(start ?? 0, context.length);
const to = normalizeSliceIndex(end ?? context.length, context.length);
const anchor = this.latestAnchor(context.length);
const measuredEnd = Math.min(to, anchor.length);
const estimatedStart = Math.max(from, anchor.length);
const measured =
from === 0 && measuredEnd === anchor.length
? anchor.tokens
: estimateTokensForMessages(context.slice(from, measuredEnd));
const estimated = estimateTokensForMessages(context.slice(estimatedStart, to));
return { size: measured + estimated, measured, estimated };
}
measured(
input: readonly Message[],
_output: readonly Message[],
usage: TokenUsage,
): Promise<void> {
const context = this.context();
if (!matchesContext(input, context)) return Promise.resolve();
return this.emit(
new TokenCountingMeasured({
agentId: this.agent.agentId,
length: context.length,
tokens: tokenUsageTotal(usage),
}),
);
}
latestMeasured(): number {
const anchors = this.state.anchors;
for (let i = anchors.length - 1; i >= 0; i--) {
if (anchors[i]!.measured) return anchors[i]!.tokens;
}
return 0;
}
statusSize(strategy: TokenCountingStrategy): number {
if (strategy === 'measured') return this.latestMeasured();
if (strategy === 'estimated') return estimateTokensForMessages(this.context());
return Math.max(this.get().size, this.latestMeasured());
}
recordTruncation(cutIndex: number): Promise<void> {
if (!this.state.anchors.some((anchor) => anchor.length > cutIndex)) {
return Promise.resolve();
}
return this.emit(
new TokenCountingTruncated({
agentId: this.agent.agentId,
length: cutIndex,
tokens: this.get(0, cutIndex).size,
}),
);
}
rebase(input: TokenCountingRebaseInput): Promise<void> {
return this.emit(
new TokenCountingRebased({
agentId: this.agent.agentId,
length: input.length,
tokens: input.tokens,
measured: input.measured,
}),
);
}
recordTurn(turnId: number, strategy: TokenCountingStrategy): Promise<void> {
return this.emit(
new TokenCountingTurnRecorded({
agentId: this.agent.agentId,
turnId,
length: this.context().length,
tokens: this.statusSize(strategy),
}),
);
}
private context(): readonly ContextMessage[] {
return this.readLegacy(contextMemoryKey) as readonly ContextMessage[];
}
private latestAnchor(contextLength: number): TokenAnchor {
const anchors = this.state.anchors;
for (let i = anchors.length - 1; i >= 0; i--) {
const anchor = anchors[i]!;
if (anchor.length <= contextLength) return anchor;
}
return ZERO_ANCHOR;
}
}
export const TokenCountingAgentModelDefinition = defineAgentModel({
id: 'tokenCounting',
model: TokenCountingAgentModel,
state: {
initial: (): TokenCountingState => ({ anchors: [], tokens: 0 }),
schema: z.custom<TokenCountingState>(),
},
events: [
TokenCountingMeasured,
TokenCountingTruncated,
TokenCountingRebased,
TokenCountingTurnRecorded,
],
});
function matchesContext(input: readonly Message[], context: readonly ContextMessage[]): boolean {
if (input.length !== context.length) return false;
for (let index = 0; index < input.length; index += 1) {
if (input[index] !== context[index]) return false;
}
return true;
}
function tokenUsageTotal(usage: TokenUsage): number {
return usage.inputCacheRead + usage.inputCacheCreation + usage.inputOther + usage.output;
}
function normalizeSliceIndex(index: number, length: number): number {
if (index < 0) return Math.max(length + index, 0);
return Math.min(index, length);
}
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