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 m-binimran/dev-pack --skill realtime-subscriptionsgit clone --depth 1 https://github.com/m-binimran/dev-packWrote 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/m-binimran/dev-pack/realtime-subscriptions)<a href="https://agentmods.dev/skills/m-binimran/dev-pack/realtime-subscriptions"><img src="https://agentmods.dev/badge/skills/m-binimran/dev-pack/realtime-subscriptions/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/m-binimran/dev-pack/realtime-subscriptions"><img src="https://agentmods.dev/badge/skills/m-binimran/dev-pack/realtime-subscriptions.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 | $0.00047 | $0.00377 |
| Opus 5.5 | $0.00019 | $0.00151 |
| Sonnet 5.5 | $0.00009 | $0.00075 |
| Haiku 4.5 | $0.00005 | $0.00038 |
Grade A, and why
realtime-subscriptions 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 1mo 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.
What it actually says
realtime-subscriptions
Live data is a client concern (it needs a persistent connection). Wire it carefully and always clean up.
Pick the mechanism
| Need | Use |
|---|---|
| React to DB inserts/updates/deletes | Postgres Changes |
| Ephemeral messages (cursors, typing) | Broadcast |
| Who's online / shared state | Presence |
Process
- Subscribe in a client component, inside
useEffect. Realtime can't live in a server component. - Always unsubscribe in the effect cleanup (
supabase.removeChannel(channel)) — leaked channels pile up and cause duplicate handlers. - RLS applies to Realtime. A client only receives change events for rows it's allowed to read. Enable Realtime on the table and confirm the policies.
- Reconcile with your cache: on an event, update the query cache (
state-architect) rather than keeping a parallel copy. Handle reconnects (refetch onSUBSCRIBEDafter a drop). - Don't over-subscribe: scope channels narrowly (filter by id); a firehose channel is a performance and cost problem.
Output
- The channel setup, the cleanup, the RLS/Realtime enablement note, and how events update the UI/cache.
Guardrails
- Every subscription has a matching cleanup — no exceptions (memory + duplicate-event bugs).
- Realtime is not your security layer; RLS is. Don't broadcast data the user can't already read.
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.
- 1mo ago First seen · 34 lines · 47 tokens per session scan A 114c9edb1b5d
realtime-subscriptions is a skill published in the GitHub repository m-binimran/dev-pack (2 stars, last pushed 4mo ago), licensed MIT. It adds 47 tokens to every session and 377 once invoked, about $0.0002 per session on Opus 5.5. 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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