API

One endpoint.

POST /api/check

Request body, JSON:

Field	Type	Rule
`claim`	string	the agent's message, 1 to 12,000 characters
`evidence`	string	the command output, 1 to 12,000 characters

Response, 200:

{
  "lines": [
    {
      "id": "tests_passed",
      "label": "Tests passed",
      "claim": { "value": "42", "span": [11, 13], "confidence": 0.57 },
      "evidence": { "value": "40", "span": [14, 16], "confidence": 0.57 },
      "status": "broken"
    }
  ],
  "tally": { "held": 0, "broken": 1, "unbacked": 0 },
  "verdict": { "supported": 0.02, "action": "retry", "actionProbabilities": { "pass": 0.01, "retry": 0.95, "ask": 0.04 } },
  "fixMinutes": { "median": 12, "low": 5, "high": 30 },
  "inputTokens": 2147
}

span is [start, end) in characters into that side's text, or null.
status is held, broken, unbacked or unclaimed.
verdict.action is pass, retry or ask. Treat anything but pass as a flag.
fixMinutes is null unless a line is broken or unbacked.
Do not use confidence for decisions. See Limits.

Errors:

Status	When
`400`	body is not JSON, or a field is missing, empty or too long
`404`	any other `/api/` path
`502`	a model call failed or replied in an unexpected shape, after retries on capacity errors

Use it as a gate

action=$(curl -s "$TETHER/api/check" -H 'content-type: application/json' \
  --data "$(jq -n --arg c "$CLAIM" --arg e "$OUTPUT" '{claim:$c,evidence:$e}')" | jq -r .verdict.action)
[ "$action" = "pass" ] || exit 1

Self-host

The Worker needs a Workers AI binding named AI and two variables, S1_EXTRACT_MODEL and S1_DECIDE_MODEL. Model ids are read from config, never from source. alchemy.run.ts deploys it.