epsilon-and-shenandoah-internals SKILL.md skillA
epsilon-and-shenandoah-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/epsilon-and-shenandoah-internals@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/epsilon-and-shenandoah-internals/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261016.c769bd8, committed Oct 16, 2026
- First version recorded
- Sep 6, 2026
- Size
- 14,729 bytes
- Repository stars
- 3
- License
- Apache-2.0
Epsilon as a measurement instrument (isolating allocation cost, failing fast against an allocation budget, sizing from time-to-OOM) and Shenandoah internals (the load reference barrier, the concurrent phase sequence, generational mode and its card-table remembered set, the heuristics and their thresholds, pacing, and the degenerated-versus-full fallbacks). Use when a hot path is claimed to be allocation-free, when benchmark numbers are polluted by collection, when an Epsilon catch block never…
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
# Epsilon and Shenandoah Internals ## Purpose Use Epsilon to turn an argument about allocation into a measurement, and reason about Shenandoah from its actual mechanism — a conditional load barrier whose slow path copies objects in the application thread, a concurrent cycle with a finite time budget, a pacer that stalls allocating threads before anything appears as a pause, and a generational mode that is product but not default. Both are misused in the same way: Epsilon as a "GC-free performance mode", Shenandoah as a collector whose only knob is heap size. The failure this prevents is the conclusion drawn from the wrong configuration. A Shenandoah throughput comparison that never named its mode is underspecified; JDK 25 defaults to `satb`, but omission from a report does not prove what ran. A service left on Epsilon because it "went faster in the benchmark" is an out-of-memory error with a countdown on it. ## Workflow Use JDK 25 HotSpot as the reference baseline, preserving the project's actual runtime. Reuse the supplied build, flags, workload, logs and acceptance criteria before asking for material missing context. For allocation-site attribution alone, hand off to …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/epsilon-and-shenandoah-internals@sha256:48e9d11128fe0619The 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_7v5mwozkrsp6tss6)
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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 | 14,729 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 14,479 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 13,861 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 13,685 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 11,903 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 (14729 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
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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_7v5mwozkrsp6tss6 GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/epsilon-and-shenandoah-internals GET https://markdownregistry.com/api/v1/blob/48e9d11128fe0619c0156963ddeffa7b714d4e8588739727c981479f0286d27e
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.