2026-05-12 — Claude Code Gateway Fix

Summary

Claude Code CLI now reaches the local Gateway Companion and the public LLM Gateway.

Verified smoke:

Local endpoint: ANTHROPIC_BASE_URL=http://127.0.0.1:11435
Model: claude-sonnet-4-6
Result: claude-debug10-ok
Gateway dashboard caller: claude-code-companion
Dashboard tracked Sonnet and Haiku rows with tokens, cost, latency, and compression metadata.

Companion:
- Anthropic /v1/messages translation clamps max_tokens to Gateway limit 16384.
- Streaming Anthropic responses no longer double-write HTTP headers.
- OpenAI-style assistant markers and prompt echo are sanitized before returning to Claude Code.
- Message IDs now include a random suffix to prevent concurrent Claude Code internal requests from colliding.
Gateway:
- Response-cache bypass is enabled for agentic callers containing claude-code, codex, or copilot.
- These callers are still logged and compression metadata is still recorded.
- This avoids stale semantic-cache answers for coding agents.

Public health: /api/dashboard/health returned ok, database connected.
Latest dashboard rows after the fix:
- claude-code-companion, claude-sonnet-4-6, tokens_in=138, tokens_out=19, latency about 441ms.
- claude-code-companion, claude-haiku-3, title/internal request tracked separately.

Claude Code text/CLI path is usable through Gateway and tracked.
Full native Anthropic tool-use parity is not complete; the Companion still flattens tool-related content into text for Gateway routing.
Small smoke prompts often show compression_mode=none:none; this is expected when there are too few tokens to compress usefully.