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 vibeeval/vibecosystem --skill background-agent-pingsgit clone --depth 1 https://github.com/vibeeval/vibecosystemWrote 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/vibeeval/vibecosystem/background-agent-pings)<a href="https://agentmods.dev/skills/vibeeval/vibecosystem/background-agent-pings"><img src="https://agentmods.dev/badge/skills/vibeeval/vibecosystem/background-agent-pings/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/vibeeval/vibecosystem/background-agent-pings"><img src="https://agentmods.dev/badge/skills/vibeeval/vibecosystem/background-agent-pings.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00009 | $0.00308 |
| Opus 5 | $0.00005 | $0.00154 |
| Sonnet 5 | $0.00002 | $0.00062 |
| Haiku 4.5 | $0.00001 | $0.00031 |
Grade A, and why
background-agent-pings 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 5d 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.
This is a copy
100% identical to background-agent-pings — 90 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Background Agent Pings
Trust system reminders as agent progress notifications. Don't poll.
Pattern
When you launch a background agent, continue working on other tasks. The system will notify you via reminders when:
- Agent makes progress:
Agent <id> progress: X new tools used, Y new tokens - Agent writes output file (check the path you specified)
DO
1. Task(run_in_background=true, prompt="... Output to: .claude/cache/agents/<type>/output.md")
2. Continue with next task immediately
3. When system reminder shows agent activity, check if output file exists
4. Read output file only when agent signals completion
DON'T
# BAD: Polling wastes tokens and time
Task(run_in_background=true)
Bash("sleep 5 && ls ...") # polling
Bash("tail /tmp/claude/.../tasks/<id>.output") # polling
TaskOutput(task_id="...") # floods context
Why This Matters
- Polling burns tokens on repeated checks
TaskOutputfloods main context with full agent transcript- System reminders are free - they're pushed to you automatically
- Continue productive work while waiting
Source
- This session: Realized polling for agent output wasted time when system reminders already provide progress updates
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.
- 5d ago First seen · 46 lines · 9 tokens per session scan A 4694dbbb8fbe
background-agent-pings is a skill published in the GitHub repository vibeeval/vibecosystem (529 stars, last pushed 1mo ago), licensed MIT. It adds 9 tokens to every session and 308 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to background-agent-pings, differing in 90 lines, and is treated as a copy.
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