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Migrates share_page / sharePage into the transport-agnostic spec registry (schema + description declared once; each transport keeps only its execute/auth): - sharePage (deferred) -> SHARED_TOOL_SPECS; index.ts uses registerShared(), ai-chat uses sharedTool(); removed from INLINE_TOOL_TIERS. Drift reconciled (documented inline): both inline copies already carried the "only share when the user explicitly asked" security framing, so the old "per-transport divergence" note in BOTH layers was STALE — there was no real behavioral divergence, only wording drift. The canonical description merges the MCP copy's URL-format + idempotency detail with the in-app copy's reversibility note and keeps the shared security framing. pageId keeps the MCP copy's stricter .min(1). The MCP execute keeps its own `searchIndexing ?? true` default (per-layer, not part of the shared schema). Intentionally NOT migrated (kept inline — genuinely divergent, as their existing notes state): - search / searchPages: the in-app tool is a semantic+keyword hybrid (RRF) with in-process access control and a tuned schema (limit 1-20); the MCP `search` is a plain REST full-text search (limit up to 100). Different behavior AND schema. - docmost_transform / transformPage: the in-app tool deliberately omits the `deleteComments` schema field (a comment-deletion guardrail) and carries a shorter description. Different schema. Gate: mcp build 0 + node --test 458/458 (page-search excluded — hangs only under the local re2->RegExp type-shim, its source untouched), server jest 775 incl. tool-tiers catalog-partition + shared-spec contract parity, server tsc 0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>