AI Platform Gateway: Project Blueprint for Production Tool Routing

Squad service ── mTLS/JWT ──► AI Gateway ──► Bedrock / tools
                                 │
                                 ├── budget + rate limits
                                 ├── prompt registry pin
                                 ├── router (draft/verify)
                                 └── traces + cost dims

# ✅ Gateway request contract
from pydantic import BaseModel, Field

class GatewayRequest(BaseModel):
    service: str
    feature: str
    prompt_id: str
    prompt_version: str | None = None  # default = prod pin
    messages: list[dict]
    tools: list[str] = Field(default_factory=list)
    max_input_tokens: int = 32_000
    stream: bool = True

// ✅ Client SDK — thin, no credentials in app config
export async function complete(req: GatewayRequest) {
  return fetch("https://ai-gateway.internal/v1/complete", {
    method: "POST",
    headers: { Authorization: `Bearer ${await svcToken()}` },
    body: JSON.stringify(req),
  });
}