gc-fundamentals SKILL.md skillA
gc-fundamentals from robsonkades/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add robsonkades/agent-skills/gc-fundamentals@git:20260927.9ecadfdPins git:20260927.9ecadfd in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- robsonkades/agent-skills
- Path
skills/gc-fundamentals/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260927.9ecadfd, committed Sep 27, 2026
- First version recorded
- Sep 2, 2026
- Size
- 10,297 bytes
- Repository stars
- 3
- License
- Apache-2.0
How JVM garbage collectors work, as the mental model behind every GC diagnosis: the generational hypothesis and where it fails, mark-sweep versus mark-compact versus copying, how survivors, allocation and roots affect collection cost, write barriers, safepoints and Time-To-SafePoint, and the JDK 25 collector landscape. Use when explaining why a collection is expensive, when the reported pause does not match the latency the client feels, when a young pause is long although little survived, when…
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
# GC Fundamentals ## Purpose Supply the mechanism behind GC symptoms, so a diagnosis explains rather than describes. The failure this prevents is tuning a collector before distinguishing workload retention, collector phase work and resource availability. A collector regression or misconfiguration remains a candidate when the evidence supports it. GC reachability is not the same as business usefulness or source-code scope. Losing the relevant root paths makes an object eligible for reclamation, subject to reference-processing rules; it does not promise immediate reclamation or closure of a file/socket. Read the reachability boundary in `references/collector-mechanisms.md` when those lifetimes are being conflated. ## Workflow 1. **Identify the target, then separate pause duration from frequency.** Inspect the exact Java build, collector/mode, effective heap/CPU limits and flags. Reuse supplied logs and accepted outcome budgets; the JDK 25 examples do not authorize a project upgrade. Duration can reflect live data, phase work or scheduling; frequency can reflect allocation, young capacity, …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/gc-fundamentals@sha256:539bff67a9348c92The line at the top of this page pins the label git:20260927.9ecadfd, 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_ml447jgcaypbon37)
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Versions
The registry has recorded 5 versions of this file, between Sep 2, 2026 and Sep 27, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260927.9ecadfd latest | 2026-09-27 | 9ecadfd | 10,297 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 10,037 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 9,278 B | A | view · diff |
| git:20260903.f199530 | 2026-09-03 | f199530 | 8,991 B | A | view · diff |
| git:20260902.3e297ca | 2026-09-02 | 3e297ca | 7,708 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 (10297 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
robsonkades/agent-skills · 3 stars · license Apache-2.0 · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ml447jgcaypbon37 GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/gc-fundamentals GET https://markdownregistry.com/api/v1/blob/539bff67a9348c92ccda51d4a66dd3f87b38dc7f3e058bd75c6cf8f6689a8355
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.