Dual-Stack Connection Race Recovery
Repair dual-stack connection establishment when IPv6 and IPv4 attempts, stagger timers, DNS refresh, pooled sockets, breaker state, and retries compete during failover. This bundle makes winner election and loser cleanup explicit while preserving request and timeout policy. Use it when clients leak candidate sockets, publish stale connections, or collapse during endpoint churn and partial network failure.
Works with every agent that reads SKILL.md — Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Windsurf, OpenClaw, and more.
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What's included
8 skills
Repair Happy Eyeballs races that publish stale winners, leak losing sockets, or misreport dual-stack connection failures.
Repair ignored DNS TTLs, startup-only resolution, stale endpoint reuse, retry-to-same-address loops, discovery refresh stampedes, and DNS/pool confusion.
Repair HTTP keep-alive lifecycle bugs that leak sockets, exhaust pools, or cause intermittent resets after idle periods and deploys.
Repair leaked or long-held connections, per-request client pools, fan-out saturation, retry amplification, and cleanup gaps without guessing pool sizes.
Align end-to-end request deadlines, retries, cancellation, database work, and side-effect ownership so server work stops when its budget is gone.
Repair circuit-breaker state races across closed, open, and half-open transitions without changing resilience policy.
Repair HTTP/2 GOAWAY drain bugs, stale pool reuse, unsafe stream retries, one-shot body replay, unknown outcomes, and replacement-connection herds.
Repair retry loops that overload APIs, queues, and external services during outages.
See it in action
Repair Happy Eyeballs Race Bugs
Example session with this skill installed
Our Go HTTP client uses a custom Happy Eyeballs dialer. IPv6 starts first and IPv4 starts after the configured delay. When both connects complete at the same barrier, both goroutines can send a socket to the result channel; the second socket leaks, and during cancellation the cleanup path occasionally closes the actual winner. Repair with a fake resolver, fake conns, barriers, and a fake clock. Preserve address order, delay, timeout, TLS, pool, and retry settings; do not dial the network.
- Read your context and instructions
- Compiled the repair happy eyeballs
Dual-stack race found. IPv6 and IPv4 can both complete before the shared promise is marked, and the late callback can replace the selected socket while leaving the other open. The repair makes winner election generation-aware and atomic, closes every loser exactly once, preserves attempt errors, and validates simultaneous success, cancellation, timeout, and all-failure paths with fake sockets.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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