AltimateAI
diff --git a/‎docs/docs/usage/check.md‎
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diff --git a/‎docs/docs/usage/cli.md‎
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diff --git a/‎docs/mkdocs.yml‎
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diff --git a/‎packages/opencode/src/cli/cmd/check-helpers.ts‎
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@@ -22,6 +22,7 @@ altimate --agent analyst
 | Command     | Description                    |
 | ----------- | ------------------------------ |
 | `run`       | Run a prompt non-interactively |
+| `check`     | Run deterministic SQL checks (no LLM required) -- see [SQL Check](check.md) |
 | `serve`     | Start the HTTP API server      |
 | `web`       | Start the web UI               |
 | `agent`     | Agent management               |
 
@@ -101,6 +101,7 @@ nav:
       - Interfaces:
           - TUI: usage/tui.md
           - CLI: usage/cli.md
+          - SQL Check: usage/check.md
           - Web UI: usage/web.md
           - CI: usage/ci-headless.md
           - IDE: usage/ide.md
 
@@ -0,0 +1,142 @@
+// altimate_change start — check-helpers: extracted helpers for deterministic SQL check command
+// These are exported separately so they can be unit-tested without importing
+// the full CLI command (which has side-effects via yargs).
+
+// ---------------------------------------------------------------------------
+// Types
+// ---------------------------------------------------------------------------
+
+export interface Finding {
+  file: string
+  line?: number
+  column?: number
+  code?: string
+  rule?: string
+  severity: "error" | "warning" | "info"
+  message: string
+  suggestion?: string
+}
+
+export interface CheckCategoryResult {
+  findings: Finding[]
+  error_count: number
+  warning_count: number
+  [key: string]: unknown
+}
+
+export interface CheckOutput {
+  version: 1
+  files_checked: number
+  checks_run: string[]
+  schema_resolved: boolean
+  results: Record<string, CheckCategoryResult>
+  summary: {
+    total_findings: number
+    errors: number
+    warnings: number
+    info: number
+    pass: boolean
+  }
+}
+
+export type Severity = "error" | "warning" | "info"
+
+export const SEVERITY_RANK: Record<Severity, number> = { error: 2, warning: 1, info: 0 }
+
+export const VALID_CHECKS = new Set(["lint", "validate", "safety", "policy", "pii", "semantic", "grade"])
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+export function normalizeSeverity(s?: string | unknown): Severity {
+  if (!s || typeof s !== "string") return "warning"
+  const lower = s.toLowerCase()
+  if (lower === "error" || lower === "fatal" || lower === "critical") return "error"
+  if (lower === "warning" || lower === "warn") return "warning"
+  return "info"
+}
+
+export function filterBySeverity(findings: Finding[], minSeverity: Severity): Finding[] {
+  const minRank = SEVERITY_RANK[minSeverity]
+  return findings.filter((f) => SEVERITY_RANK[f.severity] >= minRank)
+}
+
+export function toCategoryResult(findings: Finding[]): CheckCategoryResult {
+  return {
+    findings,
+    error_count: findings.filter((f) => f.severity === "error").length,
+    warning_count: findings.filter((f) => f.severity === "warning").length,
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Text formatter
+// ---------------------------------------------------------------------------
+
+export function formatText(output: CheckOutput): string {
+  const lines: string[] = []
+
+  lines.push(`Checked ${output.files_checked} file(s) with [${output.checks_run.join(", ")}]`)
+  if (output.schema_resolved) {
+    lines.push("Schema: resolved")
+  }
+  lines.push("")
+
+  for (const [category, catResult] of Object.entries(output.results)) {
+    if (catResult.findings.length === 0) continue
+    lines.push(`--- ${category.toUpperCase()} ---`)
+    for (const f of catResult.findings) {
+      const loc = f.line ? `:${f.line}${f.column ? `:${f.column}` : ""}` : ""
+      const rule = f.rule ? ` [${f.rule}]` : ""
+      lines.push(`  ${f.severity.toUpperCase()} ${f.file}${loc}${rule}: ${f.message}`)
+      if (f.suggestion) {
+        lines.push(`    suggestion: ${f.suggestion}`)
+      }
+    }
+    lines.push("")
+  }
+
+  const s = output.summary
+  lines.push(`${s.total_findings} finding(s): ${s.errors} error(s), ${s.warnings} warning(s), ${s.info} info`)
+  lines.push(s.pass ? "PASS" : "FAIL")
+
+  return lines.join("\n")
+}
+
+// ---------------------------------------------------------------------------
+// Output builder
+// ---------------------------------------------------------------------------
+
+export function buildCheckOutput(opts: {
+  filesChecked: number
+  checksRun: string[]
+  schemaResolved: boolean
+  results: Record<string, CheckCategoryResult>
+  failOn: "none" | "warning" | "error"
+}): CheckOutput {
+  const allFindings = Object.values(opts.results).flatMap((r) => r.findings)
+  const errors = allFindings.filter((f) => f.severity === "error").length
+  const warnings = allFindings.filter((f) => f.severity === "warning").length
+  const info = allFindings.filter((f) => f.severity === "info").length
+
+  let pass = true
+  if (opts.failOn === "error" && errors > 0) pass = false
+  if (opts.failOn === "warning" && (errors > 0 || warnings > 0)) pass = false
+
+  return {
+    version: 1,
+    files_checked: opts.filesChecked,
+    checks_run: opts.checksRun,
+    schema_resolved: opts.schemaResolved,
+    results: opts.results,
+    summary: {
+      total_findings: allFindings.length,
+      errors,
+      warnings,
+      info,
+      pass,
+    },
+  }
+}
+// altimate_change end