system-performance-guardrail SKILL.md skillA
system-performance-guardrail from jpantsjoha/ai-native-developer-experience is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jpantsjoha/ai-native-developer-experience/system-performance-guardrail@git:20260914.d9753e2Pins git:20260914.d9753e2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jpantsjoha/ai-native-developer-experience
- Path
skills/system-performance-guardrail/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260914.d9753e2, committed Sep 14, 2026
- First version recorded
- Sep 14, 2026
- Size
- 8,391 bytes
- Repository stars
- 13
- License
- Apache-2.0
Measure, root-cause, fix, verify and record performance contention on a developer machine: cloud-sync daemons (iCloud Drive, OneDrive, Dropbox, Google Drive), file indexers, AI-tool MCP server fleets, and automation browsers left behind by tests and browser skills. Trigger when the machine is slow, apps freeze, browser or MCP tool calls time out, load exceeds the core count, or before and after any UI/UX/performance test run. Includes the L0–L4 optimisation scale and the test-hygiene contract.
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
# system-performance-guardrail — the machine is part of the test environment Agentic delivery runs many things at once on one laptop: several AI CLI sessions, each with its own MCP servers; browser automation (Playwright, Selenium, Puppeteer, a CDP harness); indexers; cloud-sync clients; dev servers; test suites. When they contend, the symptoms look like product bugs — timeouts, flaky UI tests, "the site is slow" — and the next agent spends its budget diagnosing a healthy remote. This skill makes the machine's state a measured input, gives each signature a cause and a bounded action, and makes cleanup a contract rather than a hope. Script: `scripts/perf-guardrail.sh` (bash 3.2, macOS, no sudo, no third-party tools). Read-only except `cleanup --yes` (kills), `icloud throttle|restore` (signals) and `record` (appends). Linux notes are at the end. ## The loop | Phase | Command | Output | |---|---|---| …
Read the whole file at its exact version.
How to install
mdr add jpantsjoha/ai-native-developer-experience/system-performance-guardrail@sha256:18ff933d5521d728The line at the top of this page pins the label git:20260914.d9753e2, 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_od5dx463wzjr42v3)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, all committed on Sep 14, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260914.d9753e2 latest | 2026-09-14 | d9753e2 | 8,391 B | A | view · diff |
| git:20260914.af2d582 | 2026-09-14 | af2d582 | 8,550 B | A | view · diff |
| git:20260914.ed3b932 | 2026-09-14 | ed3b932 | 8,487 B | A | view · diff |
| git:20260914.47e338a | 2026-09-14 | 47e338a | 8,124 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 (8391 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
jpantsjoha/ai-native-developer-experience · 13 stars · license Apache-2.0 · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_od5dx463wzjr42v3 GET https://markdownregistry.com/api/v1/resolve?ref=jpantsjoha/ai-native-developer-experience/system-performance-guardrail GET https://markdownregistry.com/api/v1/blob/18ff933d5521d72862228c4acb4d68ecd93eedac46446647764edc5860a214cf
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.