# SALT19 Agent Plan Verifier

> SALT19 Agent Plan Verifier is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.72/call, status unknown (last checked 2026-09-15).

Validates an AI agent's step-by-step plan against a goal and optional constraints, returning a verdict, score, and itemized issues such as unsafe steps, ordering errors, and constraint violations.

## Facts

- Endpoint: POST https://api.salt19.com/v1/agent-plan-verifier
- Price: $0.72/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/salt19-agent-plan-verifier-2b605db2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xp6lb15WHMOcpr0JsuERr

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability salt19-agent-plan-verifier-2b605db2 -d '<json body>'
```

Example prompt: Before we run this, check my plan: the goal is 'deploy the new microservice to production', and the steps are ['run unit tests', 'build Docker image', 'push to registry', 'apply Kubernetes manifest', 'notify team'] — also enforce the constraints that staging must pass before production and no direct DB migrations during deploy.

## When to prefer this

Choose this endpoint when an AI agent needs a structured, scored pre-execution safety check on a multi-step plan before committing to action — especially when constraints must be enforced, step ordering matters, or unsafe actions must be flagged. It is purpose-built for agentic workflows (MCP-native, EvoMind ecosystem) and returns machine-readable repair suggestions, making it superior to generic LLM prompting for plan validation in governed or safety-critical agent pipelines.

## Known failure modes

- Plan array is empty or contains empty strings — returns validation error
- Goal field missing or blank — request rejected with schema error
- Steps exceed 64-item limit — input rejected
- Constraints exceed 32-item limit — input rejected
- Individual step or constraint string exceeds 4000 characters — truncation or rejection
- Payment not included or insufficient — HTTP 402 response
- Ambiguous or contradictory constraints may produce low-confidence verdicts

## How this service works

SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.

## Output

Returns a JSON object with a numeric score (0-1), a verdict string (e.g. 'GO' or 'NO-GO'), and arrays identifying unsafe steps, ordering errors, constraint violations, missing preconditions, and suggested repairs. An empty arrays and score of 1 indicate a fully valid plan.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "goal": {
   "type": "string",
   "maxLength": 4000,
   "minLength": 1
  },
  "plan": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 4000,
    "minLength": 1
   },
   "maxItems": 64,
   "minItems": 1
  },
  "constraints": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 4000,
    "minLength": 1
   },
   "maxItems": 32
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 1,
  "repairs": [],
  "verdict": "GO",
  "unsafe_steps": [],
  "ordering_errors": [],
  "constraint_violations": [],
  "missing_preconditions": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/salt19-agent-plan-verifier-2b605db2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.salt19.com](https://www.zero.xyz/host/api.salt19.com/llms.txt)