[Bug] Skill frontmatter fork parameter fails inconsistently

Bug Description
context: fork in skill frontmatter doesn't work most of the time -- even when specifying an agent (agent: general-purpose), most of the time (95%+), the skill just runs in my existing context/agent.

Environment Info

• Platform: darwin
• Terminal: kitty
• Version: 2.1.1
• Feedback ID: fa5c9c35-d710-495f-a126-28601d0687b1

Errors

[{"error":"Error: LSP server plugin:typescript-lsp:typescript initialize failed: Request initialize failed with message: Could not find a valid TypeScript installation. Please ensure that the \"typescript\" dependency is installed in the workspace or that a valid `tsserver.path` is specified. Exiting.\n    at Object.initialize (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2312:22649)\n    at async Object.X [as start] (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2312:25654)","timestamp":"2026-01-15T17:43:52.522Z"},{"error":"Error: Request initialize failed with message: Could not find a valid TypeScript installation. Please ensure that the \"typescript\" dependency is installed in the workspace or that a valid `tsserver.path` is specified. Exiting.\n    at GA (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2287:246)\n    at KA (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2286:6459)\n    at CA (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2286:6603)\n    at Immediate.<anonymous> (file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2286:6322)\n    at process.processImmediate (node:internal/timers:505:21)","timestamp":"2026-01-15T17:43:52.522Z"},{"error":"Error: Failed to start LSP server plugin:typescript-lsp:typescript: Request initialize failed with message: Could not find a valid TypeScript installation. Please ensure that the \"typescript\" dependency is installed in the workspace or that a valid `tsserver.path` is specified. Exiting.\n    at file:///Users/bojan.rajkovic/.local/share/mise/installs/npm-anthropic-ai-claude-code/2.1.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2312:32565","timestamp":"2026-01-15T17:43:52.522Z"}]