diff --git a/.changeset/mcp-session-idle-eviction.md b/.changeset/mcp-session-idle-eviction.md
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-"@executor-js/host-mcp": patch
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-Evict idle MCP sessions instead of holding them for the lifetime of the process. The in-process session store only released a session when the client sent `DELETE /mcp`, which the MCP client SDK's `transport.close()` never sends and a crashed client cannot send, so every `initialize` permanently retained an `McpServer`, its tool registry, and an `ExecutionEngine`. Sessions are now stamped on create and on each request, and a timer disposes anything idle past `sessionIdleTtlMs` (30 minutes by default). An open server-to-client stream does not defer eviction, matching how cloud's session alarm destroys a session once it passes its running-lease ceiling; an evicted id answers 404 `-32001`, which is the client's cue to re-initialize.
-
-A request in flight holds its session: idleness counts from when a call ends, not from when it started, so a tool call slower than the idle window is never cut off mid-flight. Disposal also shuts the session's execution engine down rather than only dropping the reference, which is what ends its detached sandbox fibers, and a handle that fails to close is now logged with its session id instead of being discarded silently.