diagnosing-perf-regressions SKILL.md skillA
diagnosing-perf-regressions from summerengine/summer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add summerengine/summer/diagnosing-perf-regressions@git:20261010.4ade947Pins git:20261010.4ade947 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- summerengine/summer
- Path
library/skills/diagnosing-perf-regressions/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261010.4ade947, committed Oct 10, 2026
- First version recorded
- Sep 1, 2026
- Size
- 11,821 bytes
- Repository stars
- 86
- License
- MIT
Find why frame rate, frame time, or load time got worse since a known-good state — regression hunting, not general performance tuning.
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
# Diagnosing Performance Regressions ## Overview There is a difference between "this game is slow" and "this game got slow." This skill is for the second one. **Core principle:** A regression has a cause. The cause is a specific change. Bisect to find the change, then root-cause from there. This skill is **not** general performance tuning. If the game has always run at 30fps and you want to push it to 60, that is `tune-performance` (the domain skill for budget-driven optimization). This skill is the diagnostic — what broke, where, when. ## When To Use - "It used to run at 60fps, now it's at 30." - "Load time was 3s yesterday, now it's 15s." - "Frame stutters started after I added X." - "Build went from buttery to choppy and I don't know why." ## When NOT To Use - "The game has always been slow, help me speed it up." → `tune-performance`. - "I want to know if my game is fast enough to ship." → `tune-performance`. - "The game crashes." → `debug`. ## The Iron Law ``` NO PERF FIX WITHOUT A KNOWN-GOOD vs KNOWN-BAD MEASUREMENT ``` …
Read the whole file at its exact version.
How to install
mdr add summerengine/summer/diagnosing-perf-regressions@sha256:160bd42fb5c751cfThe line at the top of this page pins the label git:20261010.4ade947, 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_qdvxjhs5x6ptlfl6)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Sep 1, 2026 and Oct 10, 2026, about one every 13 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261010.4ade947 latest | 2026-10-10 | 4ade947 | 11,821 B | A | view · diff |
| git:20260911.b4df358 | 2026-09-11 | b4df358 | 12,048 B | A | view · diff |
| git:20260902.548800b | 2026-09-02 | 548800b | 12,119 B | A | view · diff |
| git:20260901.7eb75a2 | 2026-09-01 | 7eb75a2 | 12,189 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 (11821 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
summerengine/summer · 86 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qdvxjhs5x6ptlfl6 GET https://markdownregistry.com/api/v1/resolve?ref=summerengine/summer/diagnosing-perf-regressions GET https://markdownregistry.com/api/v1/blob/160bd42fb5c751cf08788c8c4d6b27916652e405aa4510de9317752f24150577
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.