g1-concurrent-marking SKILL.md skillA
g1-concurrent-marking 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-concurrent-marking@git:20261016.c769bd8Pins git:20261016.c769bd8 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-concurrent-marking/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261016.c769bd8, committed Oct 16, 2026
- First version recorded
- Sep 6, 2026
- Size
- 12,077 bytes
- Repository stars
- 3
- License
- Apache-2.0
G1's concurrent marking cycle: SATB and the pre-write barrier, the cycle phases and the single mark bitmap with TAMS, adaptive IHOP triggering, mark stack overflow and its consequences, humongous allocation and eager reclaim, and mixed-collection candidate selection. Use when the log shows "Concurrent Mark Restart for Mark Stack Overflow", when "Pause Full" follows incomplete marking cycles, when "Concurrent Mark From Roots" grows longer cycle over cycle, when marking starts well away from 45%…
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 Concurrent Marking ## Purpose Decide why a G1 marking cycle is failing to do its job — starting too late for the real old-generation allocation rate, restarting after object-mark stack overflow, or never finishing before the old generation fills — and which of those the evidence in the log actually supports. Marking provides liveness for mixed-collection candidates. Late or aborted marking can reduce reclamation headroom, but does not inevitably cause full GC; inspect the actual allocation/fallback cause. The failure this prevents is treating the visible last event as the cause. A `Pause Full` at the end of a chain needs its recorded cause and preceding capacity evidence. Explicit collection, allocation pressure and evacuation failure require different investigations. ## Workflow The detailed model is HotSpot JDK 25. Reuse the target's vendor/update, effective flags, complete logs and accepted outcome budgets; preserve an older project's baseline. These are implementation details, not Java language guarantees. 1. **Confirm which phase names you are reading.** G1's cycle includes `Pause Young (Concurrent …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/g1-concurrent-marking@sha256:5b6e474f4e157b75The line at the top of this page pins the label git:20261016.c769bd8, 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_lnswnpbrnsqb4cfj)
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Versions
The registry has recorded 5 versions of this file, between Sep 6, 2026 and Oct 16, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261016.c769bd8 latest | 2026-10-16 | c769bd8 | 12,077 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 11,544 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 10,959 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 10,777 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 9,653 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 (12077 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_lnswnpbrnsqb4cfj GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/g1-concurrent-marking GET https://markdownregistry.com/api/v1/blob/5b6e474f4e157b75515d18442802bd98430010ed59028fc1eb0f526bcacef8b3
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.