The tool_search x bedrock_invoke cell only ever probed the first turn, so
nothing in the suite has sent a server_tool_use block back to a provider.
Every turn of a real Claude Code session after the first carries the
server_tool_use and tool_search_tool_result blocks the previous turn
produced, and that path was uncovered.
Adds probe_tool_search_multiturn, which takes the real assistant turn
back, answers any client-side tool_use with the id the model actually
emitted, and replays the whole thing as history with the tools still
declared. The assertion refuses to go green unless both server-tool
blocks made it into the replayed history, so a first turn truncated at
max_tokens reads as a failure instead of a vacuous pass.
The replay assertion's red paths never run in a green cell, so they get
markerless harness tests of their own alongside the existing
_builder_unit_tests tree.
No production code.
d5b91b94d3