async reliability checklist

A checklist for making asynchronous operations reliable. Asynchronous work finishes later, such as retries, webhooks, callbacks, payments, and queued messages.

In plain words
What is it for?
Use it when building or reviewing retry logic, webhook handlers, payment flows, callbacks, and message delivery.
Why use it?
It helps prevent race conditions, duplicated actions, hidden failures, unbounded retries, and incorrect results from stale or partial data.

Instructions file for GitHub Copilot

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/borgius/kanban-lite/reliability
Clone the repo
git clone --depth 1 https://github.com/borgius/kanban-lite

Made for: GitHub Copilot.

Per session 142 This file is loaded in full into every session.
When invoked 142 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00142 $0.00142
Opus 5 $0.00071 $0.00071
Sonnet 5 $0.00028 $0.00028
Haiku 4.5 $0.00014 $0.00014

Measured yesterday against content hash 29d4871d0c78, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

async reliability checklist scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/instructions/reliability.instructions.md · 13 lines

What it actually says

Async / retry / webhook reliability

  • Check for race conditions and out-of-order resolution, not just the happy path.
  • Do not swallow failures in broad try/catch; surface actionable error context.
  • Do not add retries without bounded backoff and jitter.
  • Do not assume clean state; handle stale, partial, duplicated, migrated, or otherwise dirty data.
  • Ensure repeated deliveries and retries do not double-apply side effects.
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 13 lines · 142 tokens per session scan A 29d4871d0c78

Subscribe to this mod's changes

async reliability checklist is an instructions file published in the GitHub repository borgius/kanban-lite (6 stars, last pushed 3mo ago), licensed MIT. It adds 142 tokens to every session, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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