[BUG]

⚠ Found invalid settings files. They will be ignored. Run /doctor for details.

/model

⎿  Set model to sonnet (claude-sonnet-4-20250514)

what's this error?

> /mcp
⎿  (no content)
TypeError: Cannot assign to read only property '0' of object '[object String]'
at hc2
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:6889)
at cc2
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:7090)
at kr2
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:31593)
at rr2
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:32861)
at file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:87
at Array.forEach (<anonymous>)
at Zk6
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:38)
at file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:571
at Array.map (<anonymous>)
at Hb2
(file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:422)

ERROR Cannot assign to read only property '0' of object '[object String]'

file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:6889

• hc2 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:6889)
• cc2 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:7090)
• kr2 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:31593)
• rr2 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:526:32861)
• (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:87)
• at Array.forEach (<anonymous>)
• Zk6 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:38)
• (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:571)
• at Array.map (<anonymous>)
• Hb2 (file:///home/ben/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:2108:422)

● This is a JavaScript error in Claude Code when running the /mcp command. The error "Cannot
assign to read only property '0' of object '[object String]'" typically occurs when code tries
to modify a string character directly.

● Bash(claude --version)
⎿  1.0.51 (Claude Code)

● This appears to be a bug in Claude Code v1.0.51's MCP handling. The error suggests the code is
trying to mutate a string character (which is read-only in JavaScript).