Fix: Tool Call Result Compiling

[erdnj]

Example call was resulting with an error on main branch.
With mapping in this PR, it has resolved.

Example call:

curl -sS http://127.0.0.1:3000/v1/messages \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-3.5-sonnet",
    "max_tokens": 200,
    "tools": [
      {
        "name": "get_course_outline",
        "description": "Get outline by course name",
        "input_schema": {
          "type": "object",
          "properties": { "course": { "type": "string" } },
          "required": ["course"]
        }
      }
    ],
    "messages": [
      { "role": "user", "content": "What is the outline of the MCP course?" },

      { "role": "assistant", "content": [
          { "type": "tool_use",
            "id": "TOOLUSEID",
            "name": "get_course_outline",
            "input": { "course": "MCP" }
          }
      ]},

      { "role": "user", "content": [
          { "type": "tool_result",
            "tool_use_id": "TOOLUSEID",
            "content": {
              "type": "json",
              "json": { "outline": ["Lesson 0 ...", "Lesson 1 ..."] }
            }
          }
      ]}
    ]
  }'