Tool calls break on third-party models
Tool calls fail or print as plain text on some third-party models routed through the router.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 18 July 2025 · last reported 25 December 2025
What's going wrong
Users running Claude Code through the router report that tool calls break on some third-party models.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.