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code/docs/recommendations/2026-08-19-round-3/43-mrtr-roots-boundary.md

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+# Recommendation 43: MRTR roots as an explicit workspace boundary
+
+## Evidence
+
+MCP roots let clients expose selected file or directory URIs. In MCP 2026-07-28, a server obtains roots during a request through an MRTR `ListRootsRequest` and the client must advertise the roots capability.
+
+- [MCP roots](https://modelcontextprotocol.io/specification/2026-07-28/client/roots)
+- [MCP multi-round-trip requests](https://py.sdk.modelcontextprotocol.io/handlers/multi-round-trip)
+
+## Proposed improvement
+
+For workspace import, preset, interchange, and export operations, intersect configured server policy with client-provided roots. Bind the canonical root set to the operation digest and revalidate it immediately before filesystem access.
+
+## Acceptance criteria
+
+- Unsupported clients retain the existing explicit-path policy without silent widening.
+- Symlink, junction, case, encoding, and parent-traversal tests fail closed.
+- Changed roots invalidate pending confirmation and application handles.
+- Root names and paths are redacted from default telemetry.
+
+Client-provided roots describe intended scope; operating-system permissions remain authoritative.