Spec deltas
Per-capability spec changes proposed by harden-multipath-stream-discovery.
The MCP adapter SHALL include a parseable first fetch handle in the model-visible search tool content[] text whenever the search result page contains at least one fetchable hit. The first handle SHALL appear before verbose source/package metadata such as source_mix, so clients that clip or summarize tool output still expose a usable handle. The handle SHALL match the first entry in structuredContent.results[0].id.
The reference implementation SHALL allow multiple connector types, setup methods, or acquisition paths to emit records for the same normalized stream definition when the stream semantics and record shape match. Record storage, runtime state, schedules, diagnostics, and grant-safe read attribution SHALL remain scoped to connectionid / connectorinstance_id, not to the acquisition path alone.