For: Anthropic API users wanting audit-grade tool-use logs

Claude tool-use — receipts for every API call

~6 min · prereqs: @anthropic-ai/sdk · ANTHROPIC_API_KEY in env

  1. 1

    Install the Anthropic adapter

    Wraps `@anthropic-ai/sdk` to intercept every `tool_use` block.

    pnpm add @sbo3l/anthropic
  2. 2

    Wrap your client

    API surface unchanged — just hand the SBO3L-wrapped client to your existing code.

    import Anthropic from "@anthropic-ai/sdk";
import { wrapAnthropic } from "@sbo3l/anthropic";

const raw = new Anthropic();
const claude = wrapAnthropic(raw, {
  sbo3lUrl: "http://localhost:8730",
  agentId: "research-01",
});

const reply = await claude.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  tools: [/* ... */],
  messages: [{ role: "user", content: "Send 100 USDC to 0xabc" }],
});
  3. 3

    What changed

    Every `tool_use` block in the response now has an attached `_sbo3l_receipt` — signed, hash-chained, capsule-verifiable. Denials surface as a `tool_result` block with the deny code.