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anthropic[patch]: Refactor merging tool results #6262

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merged 2 commits into from
Jul 29, 2024
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anthropic[patch]: Refactor merging tool results #6262

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anthropic[patch]: Refactor merging tool results
bracesproul Jul 29, 2024
133c45e
Merge branch 'main' into brace/refactor-merge-tool-results
bracesproul Jul 29, 2024
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66 changes: 28 additions & 38 deletions libs/langchain-anthropic/src/utils/message_inputs.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -40,17 +40,33 @@ function _mergeMessages(
for (const message of messages) {
if (message._getType() === "tool") {
if (typeof message.content === "string") {
merged.push(
new HumanMessage({
content: [
{
type: "tool_result",
content: message.content,
tool_use_id: (message as ToolMessage).tool_call_id,
},
],
})
);
const previousMessage = merged[merged.length - 1];
if (
previousMessage?._getType() === "human" &&
Array.isArray(previousMessage.content) &&
"type" in previousMessage.content[0] &&
previousMessage.content[0].type === "tool_result"
) {
// If the previous message was a tool result, we merge this tool message into it.
previousMessage.content.push({
type: "tool_result",
content: message.content,
tool_use_id: (message as ToolMessage).tool_call_id,
});
} else {
// If not, we create a new human message with the tool result.
merged.push(
new HumanMessage({
content: [
{
type: "tool_result",
content: message.content,
tool_use_id: (message as ToolMessage).tool_call_id,
},
],
})
);
}
} else {
merged.push(new HumanMessage({ content: message.content }));
}
Expand Down Expand Up @@ -158,32 +174,6 @@ function _formatContent(content: MessageContent) {
}
}

function _mergeAdjacentMessages(
messages: AnthropicMessageParam[]
): AnthropicMessageParam[] {
return messages.reduce((acc: AnthropicMessageParam[], current, index) => {
if (index === 0) {
return [current];
}

const previous = acc[acc.length - 1];

if (
previous.role === current.role &&
Array.isArray(previous.content) &&
Array.isArray(current.content) &&
// Only concatenate tool results if they are consecutive
previous.content[0].type === "tool_result" &&
current.content[0].type === "tool_result"
) {
previous.content = previous.content.concat(current.content);
return acc;
}

return [...acc, current];
}, []);
}

/**
* Formats messages as a prompt for the model.
* @param messages The base messages to format as a prompt.
Expand Down Expand Up @@ -264,7 +254,7 @@ export function _formatMessagesForAnthropic(messages: BaseMessage[]): {
}
});
return {
messages: _mergeAdjacentMessages(formattedMessages),
messages: formattedMessages,
system,
};
}
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