g1-internals SKILL.md skillA
g1-internals 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/g1-internals@git:20261028.082d2f4Pins git:20261028.082d2f4 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/g1-internals/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261028.082d2f4, committed Oct 28, 2026
- First version recorded
- Sep 11, 2026
- Size
- 11,814 bytes
- Repository stars
- 3
- License
- Apache-2.0
How G1 actually works: uniform regions and the ergonomic sizing formula, remembered sets and the card table with its write barrier, SATB and the pre-write barrier, the phases of an evacuation pause, humongous allocation and why it bypasses the young generation, and how the collection set is chosen for a mixed collection. Use when a pause is longer than the live-set size explains, when `Merge Heap Roots` or `Merge RS` dominates `-Xlog:gc+phases`, when legacy `To-space exhausted` or current…
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
# G1 Internals ## Purpose Explain a G1 pause from the mechanism that produced it, so that the tuning action follows from evidence rather than from a flag someone remembers. The same 40 ms pause means different things depending on which phase dominates: `Object Copy` identifies live-data movement and its execution cost; `Merge Heap Roots` identifies root-card preparation cost. The sub-phases and supporting measurements distinguish causes; neither duration alone nor the summary line establishes the fix. The failure this prevents is diagnosing G1 with the vocabulary of a fixed-generation collector. Mixed GC is not full GC. Humongous objects are not tenured survivors. Regions are not a young/old split. Each of those confusions sends the investigation somewhere the cause is not. ## Workflow The detailed source model here is OpenJDK 25; older/newer releases are labelled where discussed. Inspect target vendor/update, effective flags and collector before using internal names or defaults. These are HotSpot implementation details, not Java language guarantees; do not upgrade to apply them. …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/g1-internals@sha256:80ac5390e7f2cea8The line at the top of this page pins the label git:20261028.082d2f4, 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_bkszjooi2m3ckkb5)
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Versions
The registry has recorded 5 versions of this file, between Sep 11, 2026 and Oct 28, 2026, about one every 12 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261028.082d2f4 latest | 2026-10-28 | 082d2f4 | 11,814 B | A | view · diff |
| git:20261016.c769bd8 | 2026-10-16 | c769bd8 | 11,674 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 11,514 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 11,199 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 11,187 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 (11814 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_bkszjooi2m3ckkb5 GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/g1-internals GET https://markdownregistry.com/api/v1/blob/80ac5390e7f2cea8033d528e488414ab8878e9a2ad5e26dbc90334640cd159d7
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.