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.
npx skills add igmarin/rails-agent-skills --skill implement-background-jobgit clone --depth 1 https://github.com/igmarin/rails-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/igmarin/rails-agent-skills/implement-background-job)<a href="https://agentmods.dev/skills/igmarin/rails-agent-skills/implement-background-job"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/implement-background-job/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/igmarin/rails-agent-skills/implement-background-job"><img src="https://agentmods.dev/badge/skills/igmarin/rails-agent-skills/implement-background-job.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00051 | $0.01164 |
| Opus 5 | $0.00026 | $0.00582 |
| Sonnet 5 | $0.00010 | $0.00233 |
| Haiku 4.5 | $0.00005 | $0.00116 |
Grade A, and why
implement-background-job 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 10d ago.
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.
How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implement Background Job
Use this skill when the task is to add, configure, or review background jobs in a Rails application.
HARD-GATE
EVERY job MUST have its test written and validated BEFORE implementation:
1. Write the job spec (idempotency, retry, error handling)
2. Run the spec — verify it fails
3. ONLY THEN write the job class
The authoritative perform contract — EVERY perform method does exactly three things:
1. Load the record from the passed ID
2. Guard for idempotency / permanent no-op conditions
3. Delegate the side effect or orchestration to a service object
If perform needs more than that, extract a service.
EVERY job that performs a side effect (charge, email, API call) MUST have
an idempotency check BEFORE the side effect.
Core Rules
| Aspect | Rule |
|---|---|
| Arguments | Pass IDs, not objects |
| Retries | retry_on (explicit attempts:) for transient; discard_on for permanent errors |
| Backend (Rails 8) | Solid Queue (database-backed, no Redis) |
| Backend (Rails 7) | Sidekiq + Redis for high throughput |
| Recurring | config/recurring.yml (Solid Queue) or cron/sidekiq-cron |
| Anti-patterns | No ActiveRecord objects as args; no :inline/:async in production; no business logic in perform |
Core Process
- Write the job spec first — idempotency, retry, and error handling — and run it to confirm it fails.
- Write the job class following the perform contract in HARD-GATE.
- Add
retry_onwith explicitattempts:limit anddiscard_onfor at least one permanent error. - Run the full test suite.
- Enqueue or perform the job twice — confirm the second run is a no-op.
- For recurring jobs, define them in
config/recurring.yml(Rails 8) or the chosen scheduler config.
Extended Resources
Rails 8 vs Rails 7
| Aspect | Rails 7 and earlier | Rails 8 |
|---|---|---|
| Default | No default; set queue_adapter (often Sidekiq) |
Solid Queue (database-backed) |
| Dev/test | :async or :inline |
Same |
| Recurring | External (cron, sidekiq-cron) | config/recurring.yml |
| Dashboard | Third-party (Sidekiq Web) | Mission Control Jobs |
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 120 lines · 51 tokens per session scan A acb65a0c1253
implement-background-job is a skill published in the GitHub repository igmarin/rails-agent-skills (25 stars, last pushed 19d ago), licensed MIT. It adds 51 tokens to every session and 1,164 once invoked, about $0.0003 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 2026-08-30.
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