ContextTokenMeasurement
SUPPORT · interface · 类型合同
Injected token measurement for token-triggered policies.
导入
ts
import type { ContextTokenMeasurement } from '@jangts/agent-core/support';js
/** @typedef {import('@jangts/agent-core/support').ContextTokenMeasurement} ContextTokenMeasurement */其他公开入口：@jangts/agent-core/support、@jangts/agent-core/support/context。
定义
ts
interface ContextTokenMeasurement字段结构
| 字段 | 类型 | 必需 | 说明 |
|---|---|---|---|
counterId | string | 必需 | Tokenizer identity, reported in the processing report. |
inputLimit | number | 必需 | Input token ceiling the measurement is compared against. |
measure | (messages: readonly ModelMessage[]) => number | 必需 | 见类型定义及调用场景。 |
成员目录
| 成员 | 用途 |
|---|---|
measure | 完整输入输出见下方重载。 |
成员详情
measure
ts
ContextTokenMeasurement.measure(messages: readonly ModelMessage[]): number| 参数 | 类型 | 传递 | 说明 |
|---|---|---|---|
messages | readonly ModelMessage[] | 必需 | — |
返回： number。
使用示例
- 上下文策略：验证、缩减与审计：Support 给出可替换的策略实现，Core 保留最终输入合同和预算检查。
显式使用只校验策略
入门 · Node.js
ts
import { Support } from '@jangts/agent-core';
import type { ContextPolicy } from '@jangts/agent-core/support/context';
const policy: ContextPolicy = { mode: 'validate' };
Support.validateContextPolicy(policy, [], []);
console.log(policy.mode);js
import { Support } from '@jangts/agent-core';
const policy = { mode: 'validate' };
Support.validateContextPolicy(policy, [], []);
console.log(policy.mode);从真实业务片段配置缩减顺序
配置 · Node.js
这些数字是示例业务的显式选择，不是 SDK 推荐适用于所有模型的容量。
ts
import { Support } from '@jangts/agent-core';
import type { ContextPolicy } from '@jangts/agent-core/support/context';
const policy: ContextPolicy = { mode: 'reduce', triggerChars: 1800, targetInputChars: 1500,
selection: { mode: 'sequence' },
steps: [{ id: 'recent-history', kind: 'trim', fragmentId: 'history', field: 'messages',
grouping: { kind: 'user-turn' }, keepGroups: 2, targetChars: 1000 }],
};
Support.validateContextPolicy(policy, [], []);
console.log(policy.steps);js
import { Support } from '@jangts/agent-core';
const policy = { mode: 'reduce', triggerChars: 1800, targetInputChars: 1500,
selection: { mode: 'sequence' },
steps: [{ id: 'recent-history', kind: 'trim', fragmentId: 'history', field: 'messages',
grouping: { kind: 'user-turn' }, keepGroups: 2, targetChars: 1000 }],
};
Support.validateContextPolicy(policy, [], []);
console.log(policy.steps);