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Merged
wachterjohannes merged 1 commit into from
Jun 1, 2026
Merged

Add tool/function calling support for Anthropic adapter #146

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8 changes: 7 additions & 1 deletion packages/anthropic-adapter/phpstan-baseline.neon
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Original file line number Diff line number Diff line change
Expand Up @@ -33,5 +33,11 @@ parameters:
-
message: '#^Call to method PHPUnit\\Framework\\Assert\:\:assertInstanceOf\(\) with ''ModelflowAi\\\\Chat\\\\Response\\\\AIChatResponse'' and ModelflowAi\\Chat\\Response\\AIChatResponse will always evaluate to true\.$#'
identifier: method.alreadyNarrowedType
count: 4
count: 8
path: tests/Unit/Chat/AnthropicChatAdapterTest.php

-
message: '#^Call to method PHPUnit\\Framework\\Assert\:\:assertSame\(\) with ModelflowAi\\Chat\\ToolInfo\\ToolTypeEnum\:\:FUNCTION and ModelflowAi\\Chat\\ToolInfo\\ToolTypeEnum will always evaluate to true\.$#'
identifier: method.alreadyNarrowedType
count: 1
path: tests/Unit/Chat/AnthropicChatAdapterTest.php
61 changes: 57 additions & 4 deletions packages/anthropic-adapter/src/Chat/AnthropicChatAdapter.php
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Original file line number Diff line number Diff line change
Expand Up @@ -23,14 +23,18 @@
use ModelflowAi\Chat\Request\Message\AIChatMessageRoleEnum;
use ModelflowAi\Chat\Request\Message\ImageBase64Part;
use ModelflowAi\Chat\Request\Message\TextPart;
use ModelflowAi\Chat\Request\Message\ToolCallPart;
use ModelflowAi\Chat\Request\Message\ToolCallsPart;
use ModelflowAi\Chat\Request\ResponseFormat\JsonSchemaResponseFormat;
use ModelflowAi\Chat\Request\ResponseFormat\ResponseFormatInterface;
use ModelflowAi\Chat\Request\ResponseFormat\SupportsResponseFormatInterface;
use ModelflowAi\Chat\Response\AIChatResponse;
use ModelflowAi\Chat\Response\AIChatResponseMessage;
use ModelflowAi\Chat\Response\AIChatResponseStream;
use ModelflowAi\Chat\Response\AIChatToolCall;
use ModelflowAi\Chat\Response\StreamingUsageTracker;
use ModelflowAi\Chat\Response\Usage;
use ModelflowAi\Chat\ToolInfo\ToolTypeEnum;

/**
* @phpstan-import-type Parameters from MessagesInterface
Expand All @@ -41,6 +45,7 @@
AIChatMessageRoleEnum::SYSTEM,
AIChatMessageRoleEnum::ASSISTANT,
AIChatMessageRoleEnum::USER,
AIChatMessageRoleEnum::TOOL,
];

/**
Expand Down Expand Up @@ -87,15 +92,27 @@ public function handleRequest(AIChatRequest $request): AIChatResponse
$parameters['temperature'] = $temperature;
}

if ($request->hasTools()) {
$parameters['tools'] = ToolFormatter::formatTools($request->getToolInfos());
}

$messages = [];
/** @var AIChatMessage $aiMessage */
foreach ($request->getMessages() as $aiMessage) {
if (!\in_array($aiMessage->role, self::EXPECTED_ROLES, true)) {
throw new \Exception('Not supported message role.');
}

// Anthropic has no dedicated "tool" role; tool results are sent as a user message
// containing tool_result content blocks.
$role = match ($aiMessage->role) {
AIChatMessageRoleEnum::USER, AIChatMessageRoleEnum::TOOL => 'user',
AIChatMessageRoleEnum::ASSISTANT => 'assistant',
AIChatMessageRoleEnum::SYSTEM => 'system',
};

$message = [
'role' => $aiMessage->role->value,
'role' => $role,
'content' => [],
];

Expand All @@ -114,6 +131,26 @@ public function handleRequest(AIChatRequest $request): AIChatResponse
'data' => $part->content,
],
];
} elseif ($part instanceof ToolCallsPart) {
foreach ($part->toolCalls as $toolCall) {
$message['content'][] = [
'type' => 'tool_use',
'id' => $toolCall->id,
'name' => $toolCall->name,
'input' => $toolCall->arguments,
];
}
} elseif ($part instanceof ToolCallPart) {
$message['content'][] = [
'type' => 'tool_result',
'tool_use_id' => $part->toolCallId,
'content' => [
[
'type' => 'text',
'text' => $part->content,
],
],
];
} else {
throw new \Exception('Not supported message part type.');
}
Expand Down Expand Up @@ -149,6 +186,7 @@ public function handleRequest(AIChatRequest $request): AIChatResponse
];
}

/** @var Parameters $parameters */
if ($request instanceof AIChatStreamedRequest) {
return $this->createStreamed($request, $parameters);
}
Expand All @@ -163,7 +201,22 @@ private function create(AIChatRequest $request, array $parameters): AIChatRespon
{
$result = $this->client->messages()->create($parameters);

$content = $result->content[0]->text ?? '';
$content = '';
$toolCalls = [];

foreach ($result->content as $contentBlock) {
if ('text' === $contentBlock->type) {
$content .= $contentBlock->text ?? '';
} elseif ('tool_use' === $contentBlock->type && null !== $contentBlock->toolUse) {
$toolCalls[] = new AIChatToolCall(
ToolTypeEnum::FUNCTION,
$contentBlock->toolUse->id,
$contentBlock->toolUse->name,
$contentBlock->toolUse->input,
);
}
}

if ('json' === $request->getFormat() && \str_ends_with($content, '}')) {
$content = '{' . $content;
}
Expand All @@ -173,6 +226,7 @@ private function create(AIChatRequest $request, array $parameters): AIChatRespon
new AIChatResponseMessage(
AIChatMessageRoleEnum::from($result->role),
$content,
[] !== $toolCalls ? $toolCalls : null,
),
new Usage(
$result->usage->promptTokens,
Expand Down Expand Up @@ -243,8 +297,7 @@ private function createStreamedMessages(\Iterator $responses, string $prefix, St

public function supports(object $request): bool
{
return $request instanceof AIChatRequest
&& !$request->hasTools();
return $request instanceof AIChatRequest;
}

public function supportsResponseFormat(ResponseFormatInterface $responseFormat): bool
Expand Down
146 changes: 146 additions & 0 deletions packages/anthropic-adapter/src/Chat/ToolFormatter.php
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Original file line number Diff line number Diff line change
@@ -0,0 +1,146 @@
<?php

declare(strict_types=1);

/*
* This file is part of the Modelflow AI package.
*
* (c) Johannes Wachter <johannes@sulu.io>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace ModelflowAi\AnthropicAdapter\Chat;

use ModelflowAi\Chat\ToolInfo\Parameter;
use ModelflowAi\Chat\ToolInfo\ToolInfo;

final class ToolFormatter
{
/**
* @return array{
* name: string,
* description: string,
* input_schema: array{
* type: string,
* properties: array<string, array<string, mixed>>,
* required?: string[],
* },
* }
*/
public static function formatTool(ToolInfo $tool): array
{
$parameters = [];
foreach ($tool->parameters as $parameter) {
$param = self::formatParameter($parameter);
$parameters[$parameter->name] = $param;
}

$requiredParameters = [];
foreach ($tool->requiredParameters as $requiredParameter) {
$requiredParameters[] = $requiredParameter->name;
}

return [
'name' => $tool->name,
'description' => $tool->description,
'input_schema' => [
'type' => 'object',
'properties' => $parameters,
'required' => $requiredParameters,
],
];
}

/**
* @param ToolInfo[] $tools
*
* @return array<array{
* name: string,
* description: string,
* input_schema: array{
* type: string,
* properties: array<string, array<string, mixed>>,
* required?: string[],
* },
* }>
*/
public static function formatTools(array $tools): array
{
return \array_map(
self::formatTool(...),
$tools,
);
}

/**
* @return array<string, mixed>
*/
private static function formatParameter(Parameter $parameter): array
{
$type = $parameter->nullable ? [$parameter->type, 'null'] : $parameter->type;

$param = [
'type' => $type,
'description' => $parameter->description,
];

if ('array' === $parameter->type) {
if (null === $parameter->itemsOrProperties) {
throw new \Exception('Array type parameter must have items description. Define a type or use the Parameter class for object.');
}

if (\is_string($parameter->itemsOrProperties)) {
$param['items'] = [
'type' => $parameter->itemsOrProperties,
];
} else {
$properties = [];
/** @var Parameter $property */
foreach ($parameter->itemsOrProperties as $property) {
$properties[$property->name] = self::formatParameter($property);
}

$items = [
'type' => 'object',
'properties' => $properties,
];

if ([] !== $parameter->required) {
$items['required'] = $parameter->required;
}

$param['items'] = $items;
}
}

if ('object' === $parameter->type) {
if (!\is_array($parameter->itemsOrProperties)) {
throw new \Exception('Object type parameter must have properties description. You need to pass an array of Parameter.');
}

$properties = [];
/** @var Parameter $item */
foreach ($parameter->itemsOrProperties as $item) {
$properties[$item->name] = self::formatParameter($item);
}

$param['properties'] = $properties;

if ([] !== $parameter->required) {
$param['required'] = $parameter->required;
}
}

if ([] !== $parameter->enum) {
$param['enum'] = $parameter->enum;
}

if (null !== $parameter->format) {
$param['format'] = $parameter->format;
}

return $param;
}
}
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