🐛 'create' tool fails with JSON parsing error (reproducible 4x today)

[JuanCS-Dev]

Bug Description

The create tool fails with JSON parsing errors when creating files with larger content or multiple files in sequence.

Error Message

create: create a new file at undefined.
Expected ',' or '}' after property value in JSON at position 84 (line 1 column 85)

Reproduction

• Frequency: 4 times in one session (Nov 17, 2025)
• Context: Creating documentation files
• File sizes: 1KB-10KB markdown files with code blocks, emojis
• Pattern: Occurs with larger content or sequential creates

Environment

• Version: 0.0.358
• OS: Linux
• Date: 2025-11-17T17:17:54Z

Workaround

Using bash with HEREDOC works:

cat > file.md << 'EOF'
content here
EOF

Meta Bug! 🤣

This bug occurred AGAIN while trying to create THIS issue! See session log for meta-irony.

Impact

• Severity: Medium (has workaround)
• Frequency: ~20% of create attempts in my session
• User Experience: Confusing error, unclear cause

Request investigation of JSON serialization in create tool parameters.

[lpetrus-tempest]

Hello, also occurs in my case:

 ✘ create: create a new file at undefined.
   Expected ',' or '}' after property value in JSON at position 98 (line 1 column 99)

Version 0.0.361 · Commit fdd8f6541

[tokoet]

Same issue with Copilot plubing 1.5.61-243 in PyCharm.
Workaround is to instruct claude 4.5 with "When creating files, only create one file at a time to avoid errors in the create_file tool invocation." - then it does work (after 10+ tries/sessions without that addition where all of them failed).

[rpanowek]

Linked to : #758