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When an MCP server process dies or the HTTP transport drops, the client was left in connected state with stale tool definitions. No reconnect was attempted, so tools permanently vanished for the session. Register an onclose handler on each MCP client that: - Detects unexpected transport closure (not intentional disconnect) - Marks the server as failed and clears cached defs - Re-creates the client via createAndStore() using the original config - Publishes ToolsChanged event so the UI updates Guard all intentional close paths (disconnect, finalizer, closeClient) by deleting s.clients[name] BEFORE calling client.close(), so the onclose handler sees s.clients[name] !== client and returns early. Fixes anomalyco#17099
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Issue for this PR
Closes #17099
Type of change
What does this PR do?
When an MCP server process dies or the HTTP transport drops, the client stays in
connectedstate with stale tool definitions. Tools vanish permanently for the session because nothing listens for transport closure.The
watch()function only subscribes toToolListChangedNotification. It never registers anonclosehandler on the client, so when the SDK firesclient.oncloseafter transport death, nothing handles it.This PR registers
client.oncloseinwatch()that:s.clients[name] !== clientto skip intentional disconnectsfailedand clears cached defscreateAndStore()with the original config to reconnectToolsChangedso the UI updatesTo prevent intentional disconnects from triggering reconnect,
closeClient()now deletess.clients[name]before callingclient.close(). The finalizer also snapshots and clearss.clientsbefore closing clients during instance disposal.How did you verify your code works?
packages/opencode/test/mcp/lifecycle.test.ts:onclose triggers automatic reconnect when transport closes unexpectedly— simulates transport close by callingclient.onclose(), verifies the server reconnects and tools update from the new clientonclose does not trigger reconnect on intentional disconnect()— callsmcp.disconnect(), verifies status staysdisabledwith no reconnectbun turbo typecheck)MCP transport closed unexpectedlyScreenshots / recordings
N/A — no UI changes.
Checklist