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MCP annotations derived destructiveHint only from mayDiscardData, so tools that run the analysis target or a caller-selected executable (capture_process_scenario, observe_native_calls) and tools that change an attached Android device (install/uninstall/push/start/stop) advertised destructiveHint: false. Add explicit executesForeignCode and mutatesDevice effect flags, audit them across all 170 tool effect records, and derive destructiveHint = mayDiscardData || executesForeignCode || mutatesDevice. readOnlyHint semantics are unchanged. Hopper/Ghidra metadata writers (set_address_name, set_addresses_names, set_bookmark, set_comment, set_inline_comment, annotate_native_function) can replace or clear existing analyst names and comments, so they now declare mayDiscardData as well. A contract test pins the destructive set and requires every tool whose description mentions running, launching, executing, starting, installing or uninstalling to declare one of the new flags or carry a reasoned exception, so wording and effects cannot silently drift. The binary_session effects output schema carries the new flags.