[Bug] Sequential-Thinking MCP Tool: Repeated Line Display Flooding

Bug Description
Display issue when instructing agents to use the sequential-thinking MCP tool. The display is flooded with repeated lines.

Reproduction Guide

1. Add sequential-thinking MCP and start claude:

claude mcp add sequential-thinking -- npx -y @modelcontextprotocol/server-sequential-thinking && claude

1. Instruct claude to use sequencial thinking from within an agent:

I want to test something. Please instruct the general-purpose agent to use sequential-thinking to solve a math task. Invent the task.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 1.0.119
• Feedback ID: 65c73ef9-5d5a-48e8-a3ac-bced88f65f16

Errors

[{"error":"Error: Agent file /Users/work/.claude/agents/examples/tdd-usage.md is missing required 'name' in frontmatter\n    at CB5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:9300)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7749\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise.all (index 1)\n    at async W_0.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3704:1318)\n    at async W_0.parseAsync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:704:4184)\n    at async rr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3735:1293)\n    at async nr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3694:1151)","timestamp":"2025-09-19T08:47:41.064Z"},{"error":"Error: Missing required \"name\" field in frontmatter\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7863\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise.all (index 1)\n    at async W_0.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3704:1318)\n    at async W_0.parseAsync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:704:4184)\n    at async rr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3735:1293)\n    at async nr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3694:1151)","timestamp":"2025-09-19T08:47:41.069Z"},{"error":"Error: Agent file /Users/work/.claude/agents/.github/CONTRIBUTING.md is missing required 'name' in frontmatter\n    at CB5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:9300)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7749\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise.all (index 1)\n    at async W_0.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3704:1318)\n    at async W_0.parseAsync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:704:4184)\n    at async rr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3735:1293)\n    at async nr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3694:1151)","timestamp":"2025-09-19T08:47:41.070Z"},{"error":"Error: Missing required \"name\" field in frontmatter\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7863\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise.all (index 1)\n    at async W_0.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3704:1318)\n    at async W_0.parseAsync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:704:4184)\n    at async rr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3735:1293)\n    at async nr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3694:1151)","timestamp":"2025-09-19T08:47:41.071Z"},{"error":"Error: Agent file /Users/work/.claude/agents/.github/CODE_OF_CONDUCT.md is missing required 'name' in frontmatter\n    at CB5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:9300)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7749\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise.all (index 1)\n    at async W_0.<anonymous> (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3704:1318)\n    at async W_0.parseAsync (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:704:4184)\n    at async rr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3735:1293)\n    at async nr5 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:3694:1151)","timestamp":"2025-09-19T08:47:41.071Z"},{"error":"Error: Missing required \"name\" field in frontmatter\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7863\n    at Array.map (<anonymous>)\n    at file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2370:7679\n    at async Promise

Note: Error logs were truncated.