Compaction Failure: Invalid Text Content in Conversation Summary Generation

Bug Description
After selecting "No (tell Claude what to do differently)" from a Bash command, I executed /compact but got an error: "Error: Error during compaction: Error: Failed to generate conversation summary - response did not contain valid text content". It failed even after trying twice. I was using sonnet[1m].

Environment Info

• Platform: darwin
• Terminal: intellij
• Version: 1.0.83
• Feedback ID: 815cd5d0-b198-4ce1-a9d6-b8853d52230f

Errors

[{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at NX (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:1184)\n    at file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:912\n    at Array.map (<anonymous>)\n    at ZW (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:903)\n    at ZbB (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2382:6938)\n    at SR (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:330:19859)\n    at rb (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:42835)\n    at ab (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38356)\n    at wj (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38284)\n    at aR (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38138)","timestamp":"2025-08-29T07:59:05.560Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at NX (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:1184)\n    at file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:912\n    at Array.map (<anonymous>)\n    at ZW (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:903)\n    at ZbB (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:2382:6938)\n    at SR (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:330:19859)\n    at Ij (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:3227)\n    at rb (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:43616)\n    at ab (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38356)\n    at wj (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38284)","timestamp":"2025-08-29T07:59:05.915Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at NX (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:1184)\n    at file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:912\n    at Array.map (<anonymous>)\n    at ZW (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:903)\n    at Object.renderToolResultMessage (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1928:1036)\n    at JkB (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1986:2756)\n    at SR (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:330:19859)\n    at rb (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:42835)\n    at ab (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38356)\n    at wj (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:332:38284)","timestamp":"2025-08-29T08:00:10.754Z"},{"error":"Error: Language not supported while highlighting code, falling back to markdown: \n    at NX (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:1184)\n    at file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1774:912\n    at Array.map (<anonymous>)\n    at ZW (file:///Users/choongjaelee/.nvm/versions/node/v22.15.0/lib/node_mo

Note: Error logs were truncated.