With coding agents

You are adding DecisionNode to this codebase. DecisionNode is a decision API: it reads a state (text, JSON or images) and answers typed questions with calibrated probabilities. It never generates text.Endpoint: POST https://api.decisionnode.com/v1/decideAuth: header "Authorization: Bearer <key>", key read from the DECISIONNODE_API_KEY environment variable on the server. Never ship the key to a browser or log it.Request body (model and questions required, state and images optional):{  "model": "decisionnode-latest",  // or "decisionnode-flash-latest"  "state": "<text>" | { ...json },  "images": [{ "id": "photo", "media_type": "image/jpeg", "data": "<base64>" }],  "questions": {    "<key>": { "type": "choice", "instructions": "...",      "criteria": { "<option>": "<what it means>" } },    "<key>": { "type": "score", "instructions": "...",      "criteria": ["<lowest>", "...", "<highest>"] },    "<key>": { "type": "truth", "instructions": "<a statement to test>" },    "<key>": { "type": "number", "instructions": "<what to count or read>",      "min": 0, "max": 50 }  }}Response:{ "model", "answers": { "<key>": answer },  "usage": { "input_tokens", "output_tokens": 0 } }- choice: { "choice": "<one of your option keys>", "confidence", "probabilities" }- score:  { "score": <expected level index>, "confidence", "legend", "probabilities" }- truth:  { "truth": <probability the statement is true, 0.00 to 1.00> }- number: { "number": <most probable grid value>, "expected", "confidence", "probabilities" }Rules for the integration:1. Ask every question about one input in one request; the state is read once.2. Branch on confidence (choice, score) or on the truth probability. Keep the thresholds in config, not inline. Above a threshold act at once; below it take a safe automatic action (hold, decline, or re-check with the full model).3. On 429 wait for the Retry-After header, on 529 retry with exponential backoff and jitter. Do not retry 401, 403 or 422; fix the key or the body.4. Pin a version such as "decisionnode-1.0" where answers must not change across releases.5. Write a test that posts a fixed request and asserts the answer keys and types.

{
  "name": "decide",
  "description": "Ask DecisionNode a typed question about some input. Returns a choice, a score or the probability that a statement is true, all calibrated. Use it before acting on a judgment.",
  "input_schema": {
    "type": "object",
    "properties": {
      "state": {
        "type": "string",
        "description": "The text or JSON to decide about"
      },
      "question": {
        "type": "string",
        "description": "What to decide, in one sentence"
      },
      "type": {
        "type": "string",
        "enum": ["choice", "score", "truth"]
      },
      "options": {
        "type": "array",
        "items": { "type": "string" },
        "description": "Options for choice, levels low to high for score"
      }
    },
    "required": ["state", "question", "type"]
  }
}

type DecideInput = {
  state: string;
  question: string;
  type: "choice" | "score" | "truth";
  options?: string[];
};

export async function decide(input: DecideInput, apiKey: string) {
  const criteria =
    input.type === "choice"
      ? Object.fromEntries((input.options ?? []).map((o) => [o, o]))
      : input.type === "score"
        ? input.options
        : undefined;

  const response = await fetch("https://api.decisionnode.com/v1/decide", {
    method: "POST",
    headers: { Authorization: `Bearer ${apiKey}`, "Content-Type": "application/json" },
    body: JSON.stringify({
      model: "decisionnode-flash-latest",
      state: input.state,
      questions: { answer: { type: input.type, instructions: input.question, criteria } },
    }),
  });
  if (!response.ok) throw new Error(`decide failed: ${response.status}`);
  const { answers } = await response.json();
  return answers.answer; // the typed answer goes back to the agent as the tool result
}