mcp: add configurable keepalive failure threshold#982
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Introduce `KeepAliveFailureThreshold` option in both `ClientOptions` and `ServerOptions` to control how many consecutive keepalive ping failures are tolerated before closing the session. This aligns with the MCP spec's guidance that "multiple failed pings MAY trigger a connection reset," allowing operators to tune resilience against transient network hiccups without immediately tearing down otherwise healthy sessions. A threshold of 0 or 1 (the default) closes on the first failure, preserving existing behavior. Higher values let isolated misses pass while still closing the session once consecutive failures reach the threshold. A successful ping resets the counter. Tolerated failures are logged at WARN level; the final failure that closes the session is logged at ERROR level, maintaining observability per modelcontextprotocol#218.
tdabasinskas
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guglielmo-san
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May 29, 2026
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mcp: add configurable keepalive failure threshold
Introduce
KeepAliveFailureThresholdoption in bothClientOptionsandServerOptionsto control how many consecutive keepalive ping failures are tolerated before closing the session.This aligns with the MCP spec's guidance that "multiple failed pings MAY trigger a connection reset," allowing operators to tune resilience against transient network hiccups without immediately tearing down otherwise healthy sessions.
A threshold of 0 or 1 (the default) closes on the first failure, preserving existing behavior. Higher values let isolated misses pass while still closing the session once consecutive failures reach the threshold. A successful ping resets the counter.
Tolerated failures are logged at WARN level; the final failure that closes the session is logged at ERROR level.
This is rework of #979.