gate-check SKILL.md skillA
gate-check from undefined-ui/second-brain-os is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add undefined-ui/second-brain-os/gate-check@git:20261007.c7fa35bPins git:20261007.c7fa35b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- undefined-ui/second-brain-os
- Path
plugins/agents-course/skills/gate-check/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261007.c7fa35b, committed Oct 7, 2026
- First version recorded
- Sep 29, 2026
- Size
- 3,436 bytes
- Repository stars
- 1,109
- License
- MIT
Find the decisions in a pipeline that do not need the expensive model and propose the gate for each: a rule, a classic classifier, or a small model, with fail-closed routing. Use when the user asks to cut model costs or latency, says the big model handles everything, or wants a triage / routing / filter layer in front of an agent. Analysis plus an optional baseline scaffold. Do NOT use for auditing context layout (context-audit) or for building eval suites (evals-bootstrap).
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
# Find the gates Theory: [Cheap decisions](https://secondbrainos.dev/#/read/course-3-gate/cheap-decisions) and [Gate practice](https://secondbrainos.dev/#/read/course-3-gate/gate-practice). An agent does two kinds of work: it writes, which needs a big model, and it decides — is this spam, which queue, does this need a person — which is a bounded question the answer to which comes from a set you already know. A gate is a cheap decision layer that sorts the stream so the expensive model only sees the items that actually need judgement. ## Workflow 1. **Map the decisions.** Read the pipeline's entry points and prompts and list every decision made before or during a model call: classification, routing, filtering, yes/no triage, priority, language, "is this even for us". Ignore the writing — only bounded decisions with a known label set. 2. **Count what each costs today.** For each decision currently made by the big model: calls per day if known, tokens per call, and what a wrong answer costs. A decision worth one bit that burns a frontier call is the headline finding. 3. **Propose the cheapest gate that can hold it**, in rising order of cost: …
Read the whole file at its exact version.
How to install
mdr add undefined-ui/second-brain-os/gate-check@sha256:9c5ed7422b12dc80The line at the top of this page pins the label git:20261007.c7fa35b, 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_bpwpgvujm6jbrlqk)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 29, 2026 and Oct 7, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261007.c7fa35b latest | 2026-10-07 | c7fa35b | 3,436 B | A | view · diff |
| git:20260929.245ba2c | 2026-09-29 | 245ba2c | 3,466 B | A | 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 (3436 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
undefined-ui/second-brain-os · 1,109 stars · license MIT · pushed 2026-10-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bpwpgvujm6jbrlqk GET https://markdownregistry.com/api/v1/resolve?ref=undefined-ui/second-brain-os/gate-check GET https://markdownregistry.com/api/v1/blob/9c5ed7422b12dc8061a12e47bb870d8df32f8a55521287182c0bfa5d09186050
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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