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* fix(mcp): offload blocking filesystem IO in MCP config update update_mcp_configuration resolved the extensions config path, probed its existence, read the raw JSON, wrote the merged config, and reloaded it — all blocking filesystem IO on the event loop (PUT /api/mcp/config). The whole read-modify-write after the async admin check has no interleaved awaits, so it moves into one _apply_mcp_config_update helper dispatched via asyncio.to_thread; the masked response is built on the loop. The secret-preserving merge, error codes, and the stdio command allowlist are unchanged. Found via `make detect-blocking-io`. Same class as #3457 / #3529 / #3551. Add tests/blocking_io/test_mcp_router.py anchor, verified red->green under the strict Blockbuster gate. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(mcp): serialize concurrent config updates with a write lock Address review on #3552: offloading the read-modify-write to a worker thread dropped the implicit serialization the single-threaded event loop provided, so two concurrent PUT /api/mcp/config calls could interleave and clobber each other. Guard the offloaded RMW with a module-level asyncio.Lock to restore within-process atomicity (cross-process writers remain a separate, pre-existing concern). Add a serialization regression test (red->green: without the lock the tracked max concurrency exceeds 1). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix: address mcp config blocking io review --------- Co-authored-by: ly-wang19 <ly-wang19@users.noreply.github.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>