{
  "api_version": "1",
  "updated": "2026-10-17",
  "latest_event": "2026-10-15",
  "rights": "© Frontier Log, all rights reserved.",
  "story": {
    "slug": "tool-use",
    "title": "Tool Use",
    "url": "https://frontierlog.ai/stories/tool-use",
    "image": "https://frontierlog.ai/og/story-tool-use.png",
    "event": null,
    "tags": [
      "tool-use",
      "mcp"
    ],
    "steps": [
      {
        "event": "2021-12-16-webgpt",
        "date": "2021-12-16",
        "lab": "openai",
        "label": "WebGPT",
        "note": "GPT-3 answers questions by browsing the web",
        "key": false
      },
      {
        "event": "2023-03-23-chatgpt-plugins",
        "date": "2023-03-23",
        "lab": "openai",
        "label": "ChatGPT plugins",
        "note": "ChatGPT uses third-party services",
        "key": false
      },
      {
        "event": "2023-06-13-function-calling-in-the-api",
        "date": "2023-06-13",
        "lab": "openai",
        "label": "Function calling",
        "note": "API models call developers' functions",
        "key": true
      },
      {
        "event": "2024-05-30-claude-tool-use-ga",
        "date": "2024-05-30",
        "lab": "anthropic",
        "label": "Claude tool use",
        "note": "Claude calls external tools and APIs",
        "key": false
      },
      {
        "event": "2024-11-25-model-context-protocol",
        "date": "2024-11-25",
        "lab": "anthropic",
        "label": "MCP",
        "note": "Open standard for connecting tools and data",
        "key": true
      },
      {
        "event": "2025-10-06-apps-in-chatgpt",
        "date": "2025-10-06",
        "lab": "openai",
        "label": "Apps in ChatGPT",
        "note": "Third-party apps inside ChatGPT",
        "key": false
      },
      {
        "event": "2025-11-24-advanced-tool-use",
        "date": "2025-11-24",
        "lab": "anthropic",
        "label": "Advanced tool use",
        "note": "Claude finds and runs tools on demand",
        "key": false
      },
      {
        "event": "2025-12-09-mcp-to-agentic-ai-foundation",
        "date": "2025-12-09",
        "lab": "anthropic",
        "label": "MCP to Linux Foundation",
        "note": "A new foundation co-founded with OpenAI",
        "key": false
      }
    ],
    "tables": [],
    "sources": []
  }
}