fix: Ensure ports are confirmed free before allocation in Cloudflare and Python runners

[constantinius]

No description provided.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Comment claims IPv6 check but code only checks IPv4

Medium Severity

The JSDoc for isPortFree states it "Binds on both IPv4 and IPv6 loopback to match what most servers do," but the implementation only calls server.listen(port, "0.0.0.0", ...), which binds exclusively on IPv4 all-interfaces (not even loopback). No IPv6 check (e.g., on :: or ::1) is performed. On systems where localhost resolves to ::1 first (common on modern Linux/macOS), a port occupied on IPv6 would be reported as free, defeating the purpose of this PR.

 

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[github-actions]

🟡 AI SDK Integration Test Results

Status: 2 tests fixed, 192 still failing

Summary

Metric	main	PR	Change
Total Tests	667	667	—
Passed	467	469	+2 ✅
Failed	192	192	—

✅ Fixed

These tests were failing on main but are now passing:

• cloudflare/google-genai :: Long Input LLM Test (blocking)
• cloudflare/google-genai :: Conversation ID LLM Test (streaming)

Test Matrix

Agent Tests

SDK	Basic Agent Test	Conversation ID Agent Test	Long Input Agent Test	Tool Call Agent Test	Tool Error Agent Test	Vision Agent Test
browser/langgraph	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain	❌blk, combined ❌blk, compiled ❌blk, custom-state ❌blk, graph ❌blk, langchain ❌str, combined ❌str, compiled ❌str, custom-state ❌str, graph ❌str, langchain
cloudflare/langgraph	❌	❌	❌	❌	❌	❌
cloudflare/vercel	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai
nextjs/mastra	✅	❌	—	✅	✅	✅
nextjs/vercel	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai
node/langgraph	❌	❌	❌	❌	❌	❌
node/manual	✅	✅	✅	✅	✅	✅
node/mastra	✅	❌	❌	❌	❌	❌
node/vercel	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai	❌blk, class, anthropic ❌blk, class, openai ✅blk, function, anthropic ✅blk, function, openai ❌str, class, anthropic ❌str, class, openai ✅str, function, anthropic ✅str, function, openai
python/langgraph	❌a ❌s	❌a ❌s	❌a ❌s	❌a ❌s	❌a ❌s	❌a ❌s
python/manual	✅a ✅s	✅a ✅s	✅a ✅s	✅a ✅s	✅a ✅s	✅a ✅s
python/openai-agents	✅	✅	✅	✅	✅	❌
python/pydantic-ai	✅a, fallback ✅a, single	✅a, fallback ✅a, single	✅a, fallback ✅a, single	✅a, fallback ✅a, single	✅a, fallback ✅a, single	✅a, fallback ✅a, single

Embedding Tests

SDK	Basic Embeddings Test
browser/google-genai	✅
browser/langchain	✅
browser/openai	✅
cloudflare/google-genai	✅
cloudflare/langchain	✅
cloudflare/openai	✅
cloudflare/vercel	✅
nextjs/google-genai	✅
nextjs/langchain	✅
nextjs/openai	✅
nextjs/vercel	✅
node/google-genai	✅
node/langchain	✅
node/openai	✅
node/vercel	✅
python/google-genai	✅a, blk ✅s, blk
python/langchain	❌a, blk ❌s, blk
python/litellm	❌a, blk ✅s, blk
python/manual	✅a, blk ✅s, blk
python/openai	✅a, blk ✅s, blk

LLM Tests

SDK	Basic Error LLM Test	Basic LLM Test	Conversation ID LLM Test	Long Input LLM Test	Multi-Turn LLM Test	Vision LLM Test
browser/anthropic	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
browser/google-genai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
browser/langchain	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
browser/openai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
cloudflare/anthropic	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
cloudflare/google-genai	✅blk ✅str	✅blk ✅str	✅blk ✅🔧str	✅🔧blk ✅str	✅blk ✅str	✅blk ✅str
cloudflare/langchain	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
cloudflare/openai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
nextjs/anthropic	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
nextjs/google-genai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
nextjs/langchain	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
nextjs/openai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
node/anthropic	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
node/google-genai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
node/langchain	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
node/manual	—	✅	✅	✅	✅	✅
node/openai	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str	✅blk ✅str
python/anthropic	✅a, blk ❌a, str ✅s, blk ❌s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str
python/google-genai	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	❌a, blk ❌a, str ❌s, blk ❌s, str
python/langchain	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ✅a, str ✅s, blk ✅s, str
python/litellm	❌a, blk ❌a, str ❌s, blk ❌s, str	❌a, blk ❌a, str ✅s, blk ✅s, str	❌a, blk ❌a, str ✅s, blk ✅s, str	❌a, blk ❌a, str ✅s, blk ✅s, str	❌a, blk ❌a, str ✅s, blk ✅s, str	❌a, blk ❌a, str ✅s, blk ✅s, str
python/manual	—	✅a, blk ✅s, blk	✅a, blk ✅s, blk	✅a, blk ✅s, blk	✅a, blk ✅s, blk	✅a, blk ✅s, blk
python/openai	✅a, blk ✅a, str ✅s, blk ✅s, str	✅a, blk ❌a, str ✅s, blk ❌s, str	✅a, blk ❌a, str ✅s, blk ❌s, str	✅a, blk ❌a, str ✅s, blk ❌s, str	✅a, blk ❌a, str ✅s, blk ❌s, str	❌a, blk ❌a, str ❌s, blk ❌s, str

MCP Tests

SDK	Basic MCP Tool Call Test	MCP Multiple Tool Calls Test	MCP Prompt Get Test	MCP Resource Read Test	MCP Tool Error Test
node/mcp	✅sse ✅io	✅sse ✅io	✅sse ✅io	✅sse ✅io	✅sse ✅io
python/fastmcp	✅a, blk, sse ✅a, blk, io	✅a, blk, sse ✅a, blk, io	✅a, blk, sse ✅a, blk, io	✅a, blk, sse ✅a, blk, io	✅a, blk, sse ✅a, blk, io
python/mcp	✅a, blk, sse, hi ✅a, blk, sse, lo ✅a, blk, io, hi ✅a, blk, io, lo	✅a, blk, sse, hi ✅a, blk, sse, lo ✅a, blk, io, hi ✅a, blk, io, lo	✅a, blk, sse, hi ✅a, blk, sse, lo ✅a, blk, io, hi ✅a, blk, io, lo	✅a, blk, sse, hi ✅a, blk, sse, lo ✅a, blk, io, hi ✅a, blk, io, lo	✅a, blk, sse, hi ✅a, blk, sse, lo ✅a, blk, io, hi ✅a, blk, io, lo

Legend: ✅ Pass | ❌ Fail | ✅🔧 Fixed | ❌📉 Regressed | ✅🆕 New (pass) | ❌🆕 New (fail) | 🗑️ Removed | _str=streaming _blk=blocking _a=async _s=sync _io=stdio _sse=sse _hi=highlevel _lo=lowlevel

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