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64ff8f065b
Upgrades the MCP client implementation from PR #291 with: - HTTP/Streamable HTTP transport: support 'url' key in config for remote MCP servers (Notion, Slack, Sentry, Supabase, etc.) - Automatic reconnection with exponential backoff (1s-60s, 5 retries) when a server connection drops unexpectedly - Environment variable filtering: only pass safe vars (PATH, HOME, etc.) plus user-specified env to stdio subprocesses (prevents secret leaks) - Credential stripping: sanitize error messages before returning to the LLM (strips GitHub PATs, OpenAI keys, Bearer tokens, etc.) - Configurable per-server timeouts: 'timeout' and 'connect_timeout' keys - Fix shutdown race condition in servers_snapshot variable scoping Test coverage: 50 tests (up from 30), including new tests for env filtering, credential sanitization, HTTP config detection, reconnection logic, and configurable timeouts. All 1162 tests pass (1162 passed, 3 skipped, 0 failed).