Shared, IR-only substrate for Archstone emitters (ADD-0008 / RFC-0008): IR indexing (Registry), semantic-type → JSON-Schema lowering, tool-name sanitization, the response-mapping executor, and the extraction boundary (ADR-0011) — extractionJsonSchema and validateExtraction, which lower a declared resource into a closed schema and judge a model's answer against it. Depends only on @archstone/compiler — no MCP SDK, no node:fs, no HTTP — so any emitter built on it (the MCP server in @archstone/runtime, the embedded agent in @archstone/agent) can be tree-shaken cleanly.

Both directions of travel go through this package, and that is the point: a Resource Definition is the schema for a provider's response and for what a model must produce, so neither side can be mapped by a rule the other does not share.

Part of Archstone, an open-source Capability Platform — most users should install @archstone/cli instead of depending on this package directly.