Judge reason

Setup and placement are fully verified from saved MCP tool calls/results: kraken_pairs gave tick_size 0.1, lot_decimals 8, ordermin 0.00006; kraken_ticker gave best bid 73482.7; kraken_server_time gave 1794468884; three separate kraken_order_buy calls created post-only GTC limit buys at 58786.1/58051.3/57316.5 (-20/-21/-22%, each ~$10.00 notional) with cl_ord_ids ctrl0mo1/2/3 + 1794468884 and txids ODMH4K-IELSE-D3I4LS, O6GNNZ-EBD6O-6XTRWU, OPTTWK-MXR5Y-EQJEZU, and kraken_open_orders showed all three open (oflags post,fciq; gtc; volume_executed 0). The core criterion failed: mcp__kraken__kraken_order_cancel_batch returned {"error":"api","message":"EOrder:Invalid order"} on all four attempts (txids; cl_ord_ids; both; comma-joined) at transcript lines 50/56/70/115, with open_orders and query_orders between attempts confirming the txids were still open and valid, so no batch-cancel response confirms any cancellation. 'Not supported' does not apply because Kraken documents CancelOrderBatch. The three orders were cancelled only by three individual kraken_order_cancel calls (count:1 each); final kraken_open_orders is empty and query_orders shows all three status=canceled with volume_executed 0, so cleanup and no-fill are satisfied, but the single-batch-cancel requirement is not. No 502/503 credential-proxy error occurred and no credentials appear in evidence; every exchange call went through MCP tools.

Attempt record

1. 4:47Success criterion not demonstrated