What verification costs your engineering team

import { Presoja } from "@presoja/adapter-sdk";

export const presoja = new Presoja({
  apiKey: process.env.PRESOJA_KEY,
  system: "claims-qa",
  supports: ["models"],
  fingerprint: () => ({
    system_prompt_sha256: sha256(SYSTEM_PROMPT),
    // Honest nulls. A constant here is indistinguishable from a stable
    // index and would let a confounded comparison through.
    retrieval_index_version: null,
    config_sha256: null,
    decode_params_sha256: sha256(JSON.stringify({ temperature: 0 })),
  }),
});

// Wrapping the client is what makes the fingerprint arrive without
// being plumbed, and what turns a model override into a parameter.
const model = presoja.instrument(createClient(), { role: "generation" });

// Optional: mark your own retrieval, so a trace can say which step
// stopped being called. The name is yours; nothing about it changes.
const retrievePolicy = presoja.traced("retrieve_policy", retrieve);

presoja.handler(async ({ input, tenant }) => {
  if (tenant != null && !TENANTS.has(tenant)) {
    // Fails the case, not the run.
    throw new Error(`unknown tenant: ${tenant}`);
  }

  // Your own pipeline, unchanged: retrieval, prompt, model, parsing.
  const retrieved = await retrievePolicy(String(input.question));
  const answer = await yourOwnPipeline(model, retrieved, input.question);

  return {
    output: answer.text,
    // What retrieval actually returned. The span and the score are what let a
    // grader tell a hallucination from a passage nobody had a copy of.
    retrieved_sources: retrieved.map((result) => ({
      id: result.document.id,
      uri: result.document.uri,
      span: result.span,
      score: result.score,
    })),
    tenant,
  };
});

import { presoja } from "./app";

// Everything is outbound - register, then poll for work. There is no
// port to open and nothing for a firewall to allow.
const controller = new AbortController();
presoja.start({ signal: controller.signal });