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feat: add support for Anthropic tool use #209

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Merged
merged 1 commit into from
Apr 12, 2025
Merged

feat: add support for Anthropic tool use #209

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2 changes: 1 addition & 1 deletion src/Bridge/Anthropic/Claude.php
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,6 @@ public function supportsStructuredOutput(): bool

public function supportsToolCalling(): bool
{
return false; // it does, but implementation here is still open.
return true;
}
}
63 changes: 62 additions & 1 deletion src/Bridge/Anthropic/ModelHandler.php
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Original file line number Diff line number Diff line change
Expand Up @@ -4,12 +4,18 @@

namespace PhpLlm\LlmChain\Bridge\Anthropic;

use PhpLlm\LlmChain\Chain\ToolBox\Metadata;
use PhpLlm\LlmChain\Exception\RuntimeException;
use PhpLlm\LlmChain\Model\Message\AssistantMessage;
use PhpLlm\LlmChain\Model\Message\MessageBagInterface;
use PhpLlm\LlmChain\Model\Message\MessageInterface;
use PhpLlm\LlmChain\Model\Message\ToolCallMessage;
use PhpLlm\LlmChain\Model\Model;
use PhpLlm\LlmChain\Model\Response\ResponseInterface as LlmResponse;
use PhpLlm\LlmChain\Model\Response\StreamResponse;
use PhpLlm\LlmChain\Model\Response\TextResponse;
use PhpLlm\LlmChain\Model\Response\ToolCall;
use PhpLlm\LlmChain\Model\Response\ToolCallResponse;
use PhpLlm\LlmChain\Platform\ModelClient;
use PhpLlm\LlmChain\Platform\ResponseConverter;
use Symfony\Component\HttpClient\Chunk\ServerSentEvent;
Expand Down Expand Up @@ -40,13 +46,58 @@ public function request(Model $model, object|array|string $input, array $options
{
Assert::isInstanceOf($input, MessageBagInterface::class);

if (isset($options['tools'])) {
$tools = $options['tools'];
$options['tools'] = [];
/** @var Metadata $tool */
foreach ($tools as $tool) {
$toolDefinition = [
'name' => $tool->name,
'description' => $tool->description,
'input_schema' => $tool->parameters ?? ['type' => 'object'],
];
$options['tools'][] = $toolDefinition;
}
$options['tool_choice'] = ['type' => 'auto'];
}

$system = $input->getSystemMessage();
$body = array_merge($options, [
'model' => $model->getVersion(),
'system' => $system->content,
'messages' => $input->withoutSystemMessage(),
'messages' => $input->withoutSystemMessage()->jsonSerialize(),
]);

$body['messages'] = array_map(static function (MessageInterface $message) {
if ($message instanceof ToolCallMessage) {
return [
'role' => 'user',
'content' => [
[
'type' => 'tool_result',
'tool_use_id' => $message->toolCall->id,
'content' => $message->content,
],
],
];
}
if ($message instanceof AssistantMessage && $message->hasToolCalls()) {
return [
'role' => 'assistant',
'content' => array_map(static function (ToolCall $toolCall) {
return [
'type' => 'tool_use',
'id' => $toolCall->id,
'name' => $toolCall->name,
'input' => empty($toolCall->arguments) ? new \stdClass() : $toolCall->arguments,
];
}, $message->toolCalls),
];
}

return $message;
}, $body['messages']);

return $this->httpClient->request('POST', 'https://api.anthropic.com/v1/messages', [
'headers' => [
'x-api-key' => $this->apiKey,
Expand All @@ -72,6 +123,16 @@ public function convert(ResponseInterface $response, array $options = []): LlmRe
throw new RuntimeException('Response content does not contain any text');
}

$toolCalls = [];
foreach ($data['content'] as $content) {
if ('tool_use' === $content['type']) {
$toolCalls[] = new ToolCall($content['id'], $content['name'], $content['input']);
}
}
if (!empty($toolCalls)) {
return new ToolCallResponse(...$toolCalls);
}

return new TextResponse($data['content'][0]['text']);
}

Expand Down