# Typed bounded Protobuf message composer

Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment.

Compose actual proto3 wire bytes, matching explicit schema and exact field offsets from bounded acyclic integer/string/bytes declarations. Deterministic under this profile only; no universal canonical serialization, RPC, transport, credentials or execution.

Release: 0.29.0. Built: 2026-10-06T15:38:00Z.

## Choose for
- Prepare an inert request body or artifact for a separately authorized Protobuf consumer

## Outside this profile
- Recursive/imported schemas, floats, fixed-width types, enums, maps, oneofs, extensions or well-known types
- gRPC framing, sending a request, signatures or cross-implementation byte canonicality
- Executing code, writing files, environment changes, network requests, publishing or deployment

Proposed nominal USD 0.005 per successful call; payer fees excluded. No verified runtime availability.

- [Exact release contract](/reference/services/protobuf-message-compose.json)
- [Input schema](/reference/schemas/protobuf-message-compose.input.json)
- [Output schema](/reference/schemas/protobuf-message-compose.output.json)
- [Fixed example](/reference/examples/protobuf-message-compose.json)
- [Complete HTML reference](/discover/tools/protobuf-message-compose)