Module runtime 

Host-owned MCP readiness and lazy startup, downstream of policy projection.

Cached catalogs describe tools, not executable grants. A prepared server pins its cache generation; the first governed call waits for a matching live connection and rejects a changed catalog rather than executing stale metadata.

Structs

ConfiguredMcpConnector

Default host connector for configured stdio and remote HTTP declarations. Every connection is built from the immutable binding request; the connector never re-reads process environment or configuration during a run.

McpRunResources

Root-host capture supplied alongside an already-resolved run policy. The catalog/environment are immutable; runtime clones share the same cache and transport supervisor. This is not a serializable request payload or a child reconnect grant. The application host retains shutdown ownership.

McpRuntimeManager

Shared host manager for exact-key connection reuse and lazy preparation.

PreparedMcpServer

Complete preflight catalog and generation retained by one prepared step.

StdioMcpConnector

Concrete stdio host adapter. HTTP requires its own snapshot-aware adapter; this type intentionally does not claim to handle remote declarations.

Enums

McpRuntimeError

Failure before or during a projected host tool call, without secret payloads.

Traits

McpConnector

Trusted host adapter for transport establishment and complete discovery. Implementations must use the request’s snapshot and credential revision, preserve reconnect inputs, and cancel partial resources when dropped.