[Bug] Subagent spawning consumes excessive token budget (30% of 5h limit)

Bug Description
spawn of 2 subagents eat around 30% of 5 h limits

Environment Info

• Platform: darwin
• Terminal: webstorm
• Version: 2.1.117
• Feedback ID: b87d4d19-32ea-4de1-adc9-5e8f7c29bbb8

Errors

[{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":23,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:43:40.058Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":21,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:43:40.095Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":26,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:44:10.324Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":36,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:44:58.157Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":60,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:49:43.558Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {\"jsonrpc\":\"2.0\",\"id\":68,\"error\":{\"code\":-32600,\"message\":\"Anthropic Proxy: Invalid content from server\",\"data\":null}}\r\n\r\n\n    at send (/$bunfs/root/src/entrypoints/cli.js:834:36427)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-22T13:54:26.295Z"}]