# Verified Task

> Verify any agent output before it is trusted, paid for, or acted on. A universal SAR verification pattern for AI agent workflows.

- Skill: `nutstrut/verified-task` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add nutstrut/verified-task`
- Raw SKILL.md: https://api.skillmd.com/api/skills/nutstrut/verified-task/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: nutstrut (https://skillmd.com/u/nutstrut)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/nutstrut/verified-task

---


# Verified Task

A universal verification pattern for AI agents.

Verified Task allows any agent to validate its output before it is used, trusted, or paid for — using deterministic verification via SettlementWitness (SAR).

---

## Core Principle

Do not trust outputs by default.

Verify them before:
- payment
- execution
- downstream use
- decision-making

---

## What This Does

Verified Task provides a simple, standardized way to apply SAR verification to any task.

It:
- evaluates output against a defined specification
- returns a deterministic verdict (PASS / FAIL / INDETERMINATE)
- produces a verifiable receipt (SAR)
- signals whether it is safe to proceed

---

## When to Use

Use this skill whenever:

- an agent produces output that must be correct
- payment depends on task completion
- results affect decisions or actions
- trust needs to be explicit and verifiable

---

## Core Execution Flow

1. Define task specification:
   - what the agent must do
   - what correct output looks like

2. Generate output:
   - agent performs the task

3. Verify output:
   - compare output against specification

4. Receive result:
   - verdict (PASS / FAIL / INDETERMINATE)
   - SAR receipt (verifiable proof)

5. Decision:
   - PASS → proceed
   - FAIL → reject or retry
   - INDETERMINATE → review or refine

---

## Verification Call

settlement_witness({
  task_id: "task-001",
  agent_id: "0xYourWallet:your-agent",
  spec: { expected: task_spec },
  output: { result: agent_output },
  counterparty: counterparty_id
})

Endpoint: POST https://defaultverifier.com/settlement-witness

---

## Input Structure

{
  "task_id": "unique-task-identifier",
  "agent_id": "0xYourWallet:your-agent-name",
  "task_spec": "clear description of expected outcome",
  "expected_output_format": "format or constraints (optional)",
  "output": "actual result produced by the agent",
  "counterparty": "optional wallet or agent identifier"
}

---

## Output Structure

{
  "verdict": "PASS | FAIL | INDETERMINATE",
  "safe_to_proceed": true,
  "sar_receipt": {
    "receipt_v0_1": {
      "verdict": "PASS",
      "confidence": 1.0,
      "reason_code": "SPEC_MATCH",
      "receipt_id": "sha256:...",
      "verifier_kid": "sar-prod-ed25519-02",
      "sig": "base64url:..."
    },
    "trustscore_update": {
      "score": 54,
      "tier": "bronze",
      "receipts_to_next": 10
    }
  },
  "notes": "Output matched specification. Safe to proceed."
}

---

## Decision Rules

- PASS → output is verified and safe to use
- FAIL → output does not meet specification
- INDETERMINATE → cannot be confidently verified

Never proceed with payment or critical actions unless verdict = PASS.

---

## Relationship to SettlementWitness

This skill is a usage pattern for SettlementWitness (SAR).

- SettlementWitness performs deterministic verification
- Verified Task provides a simple interface for applying it

This skill does not replace SettlementWitness.  
It standardizes how agents use it.

---

## Privacy and Safety

- No private keys, credentials, or sensitive data should be included in task specifications or outputs
- Verification is stateless — no data is retained after the receipt is issued
- All verification is deterministic and reproducible

---

## Integration

Can be used with:

- payment systems (only pay on PASS)
- agent workflows (gate execution)
- trust systems (use receipts as evidence)
- reputation systems (aggregate verified outcomes)
- skill marketplaces (wrap any existing skill with a verification step)

---

## Outcome

Agents become:

- safer
- verifiable
- auditable
- trustworthy by default

---

## Keywords

ai-agents, verification, agent-safety, settlement, trust, automation, workflow-validation, workflow-safety, output-validation, deterministic-verification, agent-commerce, trustworthy-agents, sar-protocol