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* Document Agent Host E2E coverage strategy Capture the public principles for coverage-guided test selection, model-boundary choices, portable oracles, shared-server isolation, and completion criteria.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Expand Agent Host multi-chat E2E coverage Add cross-provider peer chat lifecycle and provider-backed history tests, validate actual replay requests carry prior context, and document provider capability gaps through targeted skips.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Refresh Agent Host E2E coverage metrics Regenerate the loaded-file coverage summary after rebasing the multi-chat E2E expansion onto current main.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Expand Agent Host peer chat E2E coverage Add 21 peer-chat scenarios covering local commands, workspace tools, provider context isolation and attachment projection. Record strict Claude and Copilot fixtures and refresh aggregate coverage metrics.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Document disabled Agent Host E2E tests Add a persistent inventory and reevaluation process for suspected provider bugs, platform limitations, record-only scenarios, and capability skips. Gate the two Copilot peer file mutations whose recorded POSIX tool plans do not produce Windows filesystem effects.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Strengthen Agent Host context assertions Require prior assistant responses to be non-empty before using them to verify provider request history.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Fix Agent Host E2E approval loop Deduplicate retained toolCallReady notifications by server sequence so the permission test sends one confirmation instead of flooding and terminating the shared Copilot host.\n\n(Written by Copilot)\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Recycle shared Agent Host E2E server to prevent cumulative wedge The shared replay server caches one provider SDK/CLI subprocess and reuses it across the whole suite. After enough sessions that subprocess degrades and eventually wedges a turn (turn starts, no model response arrives even though replay is instant), which times out and, via teardown of the mid-turn session, leaves the host unavailable so the next test hits ECONNREFUSED. Proactively recycle the server every 25 tests, and restart it after any failed test so a wedge cannot cascade into unrelated tests. (Written by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>