backend-realtime SKILL.md skillA
backend-realtime from kensaurus/cursor-kenji is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add kensaurus/cursor-kenji/backend-realtime@git:20261006.39320f8Pins git:20261006.39320f8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- kensaurus/cursor-kenji
- Path
skills/backend-realtime/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261006.39320f8, committed Oct 6, 2026
- First version recorded
- Jul 18, 2026
- Size
- 6,838 bytes
- Repository stars
- 9
- License
- MIT
Implement real-time features with WebSockets, Supabase Realtime, or Server-Sent Events. Use when "real-time", "live updates", "WebSocket", "notifications", "chat", "presence", "collaborative", "live data", or "instant sync".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Real-time Features Skill **Degree of freedom: MIXED.** Which transport and event `[HIGH freedom]`; existing-subscription probes and unmount cleanup `[LOW freedom — run exactly]`. ## How to reason 1. **Observe** — existing channels, sockets, hooks, cleanup 2. **Interpret** — new subscription vs reuse vs transport mismatch 3. **Classify** — postgres-changes / presence / broadcast / SSE / optimistic 4. **Severity** — leaked or duplicate subscription outranks a missing typing indicator ## Worked example > **Observe:** chat mounts `useRealtimeMessages` twice; no untrack on leave; `package.json` already has `@supabase/supabase-js`. > **Interpret:** duplicate INSERT listeners; leftover presence. > **Classify:** one channel hook with unmount cleanup; reuse Supabase Realtime — do not add Socket.io. > **Verify:** one `postgres_changes` subscription; `removeChannel` on unmount; no second socket lib. ## Self-critique before reporting - **Existing first** — grepped channels/sockets before adding a library - **Cleanup** — every subscribe has unmount `removeChannel` / `close` - **One listener** — no duplicate subscription for the same event …
Read the whole file at its exact version.
How to install
mdr add kensaurus/cursor-kenji/backend-realtime@sha256:bd0b829a45ce516bThe line at the top of this page pins the label git:20261006.39320f8, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_z62y3e4itagebgal)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Jul 18, 2026 and Oct 6, 2026, about one every 16 days. Its first recorded version is graded B and its latest A.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261006.39320f8 latest | 2026-10-06 | 39320f8 | 6,838 B | A | view · diff |
| git:20260923.68c095e | 2026-09-23 | 68c095e | 10,136 B | A | view · diff |
| git:20260923.cf348bd | 2026-09-23 | cf348bd | 10,085 B | B | view · diff |
| git:20260912.33d48b1 | 2026-09-12 | 33d48b1 | 10,005 B | B | view · diff |
| git:20260821.2a41031 | 2026-08-21 | 2a41031 | 10,015 B | B | view · diff |
| git:20260718.39b8cc1 | 2026-07-18 | 39b8cc1 | 8,597 B | B | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6838 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
kensaurus/cursor-kenji · 9 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_z62y3e4itagebgal GET https://markdownregistry.com/api/v1/resolve?ref=kensaurus/cursor-kenji/backend-realtime GET https://markdownregistry.com/api/v1/blob/bd0b829a45ce516b22164b79e511b2238083592b63946b94e31661969ed8e504
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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