ContextModelCall

SUPPORT · interface · Type contract

Same runner and same fixed invocation result as public model calls.

Import

TypeScript

import type { ContextModelCall } from '@jangts/agent-core/support';

JavaScript

/** @typedef {import('@jangts/agent-core/support').ContextModelCall} ContextModelCall */

Other public entry points:@jangts/agent-core/support, @jangts/agent-core/support/context.

Definition

interface ContextModelCall

Call

ContextModelCall(request: ContextModelRequest): Promise<ModelResult<unknown>>

Parameter	Type	Passing	Description
request	ContextModelRequest	Required	—

Fields of request

Field	Type	Required	Description
modelId	string | undefined	Optional	Read-only. See the type definition and usage context.
stageId	string	Required	Read-only. See the type definition and usage context.
input	readonly ModelMessage[] | BuiltContext	Required	Read-only. See the type definition and usage context.
maxOutputTokens	number	Required	Read-only. See the type definition and usage context.
transport	string	Required	Read-only. See the type definition and usage context.

Returns: Promise<ModelResult<unknown>>.

Awaited value: ModelResult<unknown>.

Return value structure

Field	Type	Required	Description
value	unknown	Required	Read-only. See the type definition and usage context.
invocation	Readonly<ModelCallRecord>	Required	Read-only. See the type definition and usage context.

Examples

• Compressors and selectors: recommended implementations and custom algorithms: Bind prompts, output parsing, and algorithms as handlers; model I/O goes through callModel of the same request.

Bind a text compression handler

Beginner · Node.js

TypeScript

import { Support } from '@jangts/agent-core';
const compressor = Support.createContextCompressor({
  id: 'history-summary', instruction: '保留事实、时间和未完成事项，精简重复表达。',
  transport: 'core:plain-text', maxOutputTokens: 500,
  parse(value: unknown) { if (typeof value !== 'string' || !value.trim()) throw new TypeError('需要非空摘要'); return value; },
});
console.log(compressor.id);

JavaScript

import { Support } from '@jangts/agent-core';
const compressor = Support.createContextCompressor({
    id: 'history-summary', instruction: '保留事实、时间和未完成事项，精简重复表达。',
    transport: 'core:plain-text', maxOutputTokens: 500,
    parse(value) { if (typeof value !== 'string' || !value.trim())
        throw new TypeError('需要非空摘要'); return value; },
});
console.log(compressor.id);

A selector explicitly controls the visible excerpt range

Configuration · Node.js

selector-json must be registered by the App and return value={stepIds:string[]}; an ordinary text transport must not be treated as already parsed JSON. This example only shows handler assembly and sends no request.

TypeScript

import { Support } from '@jangts/agent-core';
const selector = Support.createContextSelector({ id: 'select-reduction',
  transport: 'selector-json', maxOutputTokens: 200, maxExcerptChars: 1000,
});
console.log(selector.id);

JavaScript

import { Support } from '@jangts/agent-core';
const selector = Support.createContextSelector({ id: 'select-reduction',
    transport: 'selector-json', maxOutputTokens: 200, maxExcerptChars: 1000,
});
console.log(selector.id);

Related policy source

• Default selection instruction and excerpt range
• Compression request and the real callModel contract

Related definitions

• ContextModelRequest
• ModelCallRecord
• ModelResult