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json_output_tools_parsers.ts
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json_output_tools_parsers.ts
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import { z } from "zod";
import { ChatGeneration } from "../../outputs.js";
import { BaseLLMOutputParser, OutputParserException } from "../base.js";
import { parsePartialJson } from "../json.js";
import { InvalidToolCall, ToolCall } from "../../messages/tool.js";
export type ParsedToolCall = {
id?: string;
type: string;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
args: Record<string, any>;
/** @deprecated Use `type` instead. Will be removed in 0.2.0. */
name: string;
/** @deprecated Use `args` instead. Will be removed in 0.2.0. */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
arguments: Record<string, any>;
};
export type JsonOutputToolsParserParams = {
/** Whether to return the tool call id. */
returnId?: boolean;
};
export function parseToolCall(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
rawToolCall: Record<string, any>,
options: { returnId?: boolean; partial: true }
): ToolCall | undefined;
export function parseToolCall(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
rawToolCall: Record<string, any>,
options?: { returnId?: boolean; partial?: false }
): ToolCall;
export function parseToolCall(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
rawToolCall: Record<string, any>,
options?: { returnId?: boolean; partial?: boolean }
): ToolCall | undefined {
if (rawToolCall.function === undefined) {
return undefined;
}
let functionArgs;
if (options?.partial) {
try {
functionArgs = parsePartialJson(rawToolCall.function.arguments ?? "{}");
} catch (e) {
return undefined;
}
} else {
try {
functionArgs = JSON.parse(rawToolCall.function.arguments);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
} catch (e: any) {
throw new OutputParserException(
[
`Function "${rawToolCall.function.name}" arguments:`,
``,
rawToolCall.function.arguments,
``,
`are not valid JSON.`,
`Error: ${e.message}`,
].join("\n")
);
}
}
const parsedToolCall: ToolCall = {
name: rawToolCall.function.name,
args: functionArgs,
};
if (options?.returnId) {
parsedToolCall.id = rawToolCall.id;
}
return parsedToolCall;
}
export function convertLangChainToolCallToOpenAI(toolCall: ToolCall) {
if (toolCall.id === undefined) {
throw new Error(`All OpenAI tool calls must have an "id" field.`);
}
return {
id: toolCall.id,
type: "function",
function: {
name: toolCall.name,
arguments: JSON.stringify(toolCall.args),
},
};
}
export function makeInvalidToolCall(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
rawToolCall: Record<string, any>,
errorMsg?: string
): InvalidToolCall {
return {
name: rawToolCall.function?.name,
args: rawToolCall.function?.arguments,
id: rawToolCall.id,
error: errorMsg,
};
}
/**
* Class for parsing the output of a tool-calling LLM into a JSON object.
*/
export class JsonOutputToolsParser extends BaseLLMOutputParser<
ParsedToolCall[]
> {
static lc_name() {
return "JsonOutputToolsParser";
}
returnId = false;
lc_namespace = ["langchain", "output_parsers", "openai_tools"];
lc_serializable = true;
constructor(fields?: JsonOutputToolsParserParams) {
super(fields);
this.returnId = fields?.returnId ?? this.returnId;
}
/**
* Parses the output and returns a JSON object. If `argsOnly` is true,
* only the arguments of the function call are returned.
* @param generations The output of the LLM to parse.
* @returns A JSON object representation of the function call or its arguments.
*/
async parseResult(generations: ChatGeneration[]): Promise<ParsedToolCall[]> {
const toolCalls = generations[0].message.additional_kwargs.tool_calls;
if (!toolCalls) {
throw new Error(
`No tools_call in message ${JSON.stringify(generations)}`
);
}
const clonedToolCalls = JSON.parse(JSON.stringify(toolCalls));
const parsedToolCalls = [];
for (const toolCall of clonedToolCalls) {
const parsedToolCall = parseToolCall(toolCall, { partial: true });
if (parsedToolCall !== undefined) {
// backward-compatibility with previous
// versions of Langchain JS, which uses `name` and `arguments`
// @ts-expect-error name and arguemnts are defined by Object.defineProperty
const backwardsCompatibleToolCall: ParsedToolCall = {
type: parsedToolCall.name,
args: parsedToolCall.args,
id: parsedToolCall.id,
};
Object.defineProperty(backwardsCompatibleToolCall, "name", {
get() {
return this.type;
},
});
Object.defineProperty(backwardsCompatibleToolCall, "arguments", {
get() {
return this.args;
},
});
parsedToolCalls.push(backwardsCompatibleToolCall);
}
}
return parsedToolCalls;
}
}
export type JsonOutputKeyToolsParserParams<
// eslint-disable-next-line @typescript-eslint/no-explicit-any
T extends Record<string, any> = Record<string, any>
> = {
keyName: string;
returnSingle?: boolean;
/** Whether to return the tool call id. */
returnId?: boolean;
zodSchema?: z.ZodType<T>;
};
/**
* Class for parsing the output of a tool-calling LLM into a JSON object if you are
* expecting only a single tool to be called.
*/
export class JsonOutputKeyToolsParser<
// eslint-disable-next-line @typescript-eslint/no-explicit-any
T extends Record<string, any> = Record<string, any>
> extends BaseLLMOutputParser<T> {
static lc_name() {
return "JsonOutputKeyToolsParser";
}
lc_namespace = ["langchain", "output_parsers", "openai_tools"];
lc_serializable = true;
returnId = false;
/** The type of tool calls to return. */
keyName: string;
/** Whether to return only the first tool call. */
returnSingle = false;
initialParser: JsonOutputToolsParser;
zodSchema?: z.ZodType<T>;
constructor(params: JsonOutputKeyToolsParserParams<T>) {
super(params);
this.keyName = params.keyName;
this.returnSingle = params.returnSingle ?? this.returnSingle;
this.initialParser = new JsonOutputToolsParser(params);
this.zodSchema = params.zodSchema;
}
protected async _validateResult(result: unknown): Promise<T> {
if (this.zodSchema === undefined) {
return result as T;
}
const zodParsedResult = await this.zodSchema.safeParseAsync(result);
if (zodParsedResult.success) {
return zodParsedResult.data;
} else {
throw new OutputParserException(
`Failed to parse. Text: "${JSON.stringify(
result,
null,
2
)}". Error: ${JSON.stringify(zodParsedResult.error.errors)}`,
JSON.stringify(result, null, 2)
);
}
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
async parseResult(generations: ChatGeneration[]): Promise<any> {
const results = await this.initialParser.parseResult(generations);
const matchingResults = results.filter(
(result) => result.type === this.keyName
);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
let returnedValues: ParsedToolCall[] | Record<string, any>[] =
matchingResults;
if (!this.returnId) {
returnedValues = matchingResults.map((result) => result.args);
}
if (this.returnSingle) {
return this._validateResult(returnedValues[0]);
}
const toolCallResults = await Promise.all(
returnedValues.map((value) => this._validateResult(value))
);
return toolCallResults;
}
}