FirstBuild

Custom MCP servers

Give AI a safe way to use your systems.

An MCP server is the standard way to let AI assistants actually use your systems. We design and build them custom to your stack: typed tools, scoped auth, and a full audit trail.

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What you get

  • A tool for each real action, mapped to your APIs
  • Scoped, auditable auth, least privilege by default
  • Typed inputs and outputs, validated at the boundary
  • Built to run in production, monitored from day one
Model Context ProtocolScoped authTypeScriptObservability

// 12 tools · p95 0.4s · 99.98% success

mcp://firstbuild/ledger
  • resolve_customer
  • fetch_invoices
  • reconcile_ledger
  • post_journal
  • list_accounts

tool · reconcile_ledger

{
  "input":  { "period": "2026-Q2",
              "account": "AR" },
  "auth":   "scoped",
  "returns": "Report"
}

connected · 12 tools · p95 0.4s

The rest of the stack

AI automation

We connect what you already run so a day of work runs on its own, correctly, every time.

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App development

Native-feeling iOS, Android, and web apps engineered to a standard your team is proud to ship.

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Web development

Marketing sites and product surfaces that are fast, accessible, and precise to the pixel.

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