Ben 724377c429 test(mcp): add failing tests for circuit-breaker recovery ...

The MCP circuit breaker in tools/mcp_tool.py has no half-open state and
no reset-on-reconnect behavior, so once it trips after 3 consecutive
failures it stays tripped for the process lifetime. These tests lock
in the intended recovery behavior:

1. test_circuit_breaker_half_opens_after_cooldown — after the cooldown
   elapses, the next call must actually probe the session; success
   closes the breaker.
2. test_circuit_breaker_reopens_on_probe_failure — a failed probe
   re-arms the cooldown instead of letting every subsequent call
   through.
3. test_circuit_breaker_cleared_on_reconnect — a successful OAuth
   recovery resets the breaker even if the post-reconnect retry
   fails (a successful reconnect is sufficient evidence the server
   is viable again).

All three currently fail, as expected.

2026-04-21 05:19:03 -07:00

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