[Bug] Explore agent fails with zero tool uses at conversation start

Bug Description
Issue started ~2 weeks ago
Explore agent fails immediately with "0 tool uses · 0 tokens · 0s"
Happens at conversation start with clean context
Persists with no MCP servers, no git changes, and /doctor showing no issues

Environment Info

• Platform: darwin
• Terminal: zed
• Version: 2.1.123
• Feedback ID: 9914e020-13c6-4413-b642-de4bcb5e8b18

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/tory/.local/share/claude/versions/2.1.123 (expected in multi-process scenarios)\n    at x86 (/$bunfs/root/src/entrypoints/cli.js:2769:2177)\n    at Jw8 (/$bunfs/root/src/entrypoints/cli.js:2769:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-30T13:36:26.855Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"prompt is too long: 213605 tokens > 200000 maximum\"},\"request_id\":\"req_011Caa47XwG76z1iWFPoDq6K\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:57693)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-30T13:43:33.830Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"prompt is too long: 213605 tokens > 200000 maximum\"},\"request_id\":\"req_011Caa48CQnjJ6MrRLeachxB\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:57693)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-30T13:43:43.248Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"prompt is too long: 213605 tokens > 200000 maximum\"},\"request_id\":\"req_011Caa48pMkkrYpJAThpkano\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:57693)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-30T13:43:51.297Z"}]