ProxyPal Files

Bug Fix: Claude Code ECONNRESET (#205)

Root Cause

When ProxyPal's Configure button was used with only Copilot as a provider, the Claude Code settings.json was written with gpt-5.3-codex (or another full gpt-5.X-codex model) assigned to all five model env vars including ANTHROPIC_SMALL_FAST_MODEL / ANTHROPIC_DEFAULT_HAIKU_MODEL.

These codex models are heavyweight Copilot models routed internally through copilot-api on localhost:4141. If copilot-api is not running, the sidecar closes the TCP connection mid-request and Claude Code receives ECONNRESET on every lightweight background call (auto-compact, context summaries, tool use, etc.).

Fixes Applied

1. Haiku/SMALL_FAST tier: removed bare "gpt-5" fallback pattern

• Old code: find_model(&["claude-3-5-haiku", ..., "gpt-5"]) — matched any GPT-5 model including full codex variants
• New code: only matches explicit mini/nano variants: gpt-5.4-mini, gpt-5.4-nano, gpt-5-mini, gpt-5-codex-mini
• Falls back to claude-3-5-haiku-20241022 if none found (safe default)

2. ANTHROPIC_SMALL_FAST_MODEL was silently missing from generated config

• Was absent from the env_config JSON object entirely
• Was absent from the merge block when updating existing settings.json
• Claude Code fell back to its default or kept a stale value → caused ECONNRESET on background calls

Workaround (for existing affected users)

Re-run Configure on the Claude Code agent in ProxyPal. This will rewrite ~/.claude/settings.json with correct model assignments. Alternatively, manually edit ~/.claude/settings.json and set:

:::json
"ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-3-5-haiku-20241022",
"ANTHROPIC_SMALL_FAST_MODEL": "claude-3-5-haiku-20241022"

(or any lightweight model your provider supports)