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* feat: add LoopDetectionMiddleware to break repetitive tool call loops Adds a new AgentMiddleware that detects when the agent is stuck calling the same tools with the same arguments repeatedly, which currently runs until the recursion limit kills the run. Detection: per-thread sliding window of tool call hashes (name + args). - Warn threshold (default 3): injects a "wrap up" system message - Hard limit (default 5): strips tool_calls, forcing final text output Includes 13 unit tests covering hashing, thresholds, window sliding, reset, and edge cases. Closes #1055 * fix: address PR #1056 review feedback for LoopDetectionMiddleware - Remove unused imports (Awaitable, Callable, ModelCallResult, ModelRequest, ModelResponse, AIMessage) from loop_detection_middleware - Remove unused pytest import from test file - Fix _hash_tool_calls sort key: sort by (name, serialized args) for deterministic hashing when multiple calls share the same tool name - Revert subagent_enabled default to False in agent.py to match DeerFlowClient and channel defaults - Remove unrelated SearxNG tools and Next.js rewrite changes from PR Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: address 2nd round review feedback on PR #1056 - Inject loop warning only once per thread (prevents context bloat) - Add threading.Lock for thread-safe history mutations - Use runtime.context thread_id instead of workspace_path - Add LRU eviction for per-thread history (max 100 threads) - Add 5 new tests covering warn-once, LRU eviction, thread isolation, fallback thread_id, and lock presence Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: resolve lint errors in loop detection middleware tests Sort imports (I001) and remove unused _WARNING_MSG import (F401) to fix ruff lint failures in CI. * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>