[Bug]: Anthropic model calls with Tools : Input should be a valid dictionary

[simonljn]

What happened?

Using litelllm image v1.71.1-stable for litellm proxy

I have an error with Anthropic model calls with Tools that i don't have on openai calls for the same request :

'litellm.BadRequestError: AnthropicException - {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.0.tool_use.input: Input should be a valid dictionary"}}. Received Model Group=x-anthropic-x\n'

Sample code :

import openai from "openai";

const client = new openai({
  apiKey: "xx",
  baseURL: "https://litellm-xx",
});

async function main() {
  const out = await client.chat.completions.create({
    messages: [
      {
        content: "search : foo",
        role: "user",
      },
      {
        role: "assistant",
        tool_calls: [
          {
            function: {
              arguments: '"{\\"query\\": \\"foo\\"}"',
              name: "WebSearch",
            },
            id: "toolu_01LaSrYM7jQ4snmb3h4cb2A2",
            type: "function",
          },
        ],
      },
      {
        content: "...  foo search response ....",
        role: "tool",
        tool_call_id: "toolu_01LaSrYM7jQ4snmb3h4cb2A2",
      },
      {
        content: "search : bar",
        role: "user",
      },
    ],
    model: "x-anthropic-x",
    tool_choice: "auto",
    tools: [
      {
        function: {
          description: "Make a search",
          name: "Search",
          parameters: {
            properties: {
              query: {
                description: "The search query",
                type: "string",
              },
            },
            required: ["query"],
            type: "object",
          },
        },
        type: "function",
      },
    ],
  });

  console.log(out);
}

main();

Relevant log output

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

v1.71.1

Twitter / LinkedIn details

No response