internal/

Package backend defines the Backend seam: where Billet actually stores and recalls memory.

Package cli defines the billet command tree and binds flags onto the declarative BilletConfig.

Package config defines BilletConfig: the single declarative configuration a Billet server is built from.

Package cost implements Billet's v1 cost governance: a rough, rolling call-count-based estimate of AgentCore spend, checked before every save_memory/search_memory call.

Package mcpserver exposes Billet's tool surface as an MCP server over Streamable HTTP: the save_memory and search_memory tools Stirrup's harness calls directly (docs/DECISIONS.md, "two transports").

Package rpcserver exposes Billet's tool surface as a Connect RPC service (billet.v1.MemoryService) speaking the Connect, gRPC, and gRPC-Web protocols, for control-plane-proxied deployments where the agent environment has no direct network access to Billet (docs/DECISIONS.md, "two transports").

Package secret defines the Resolver seam for secret:// references, the suite-wide convention for keeping credentials out of configuration.

Package service implements the transport-neutral core of Billet's two tool operations: input validation, the cost-guard gate, limit clamping, and the generic caller-facing error policy.