c2-sea-of-nodes SKILL.md skillA
c2-sea-of-nodes 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/c2-sea-of-nodes@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/c2-sea-of-nodes/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261016.c769bd8, committed Oct 16, 2026
- First version recorded
- Sep 6, 2026
- Size
- 12,889 bytes
- Repository stars
- 3
- License
- Apache-2.0
How HotSpot actually executes and compiles: the runtime-generated template interpreter, C2's sea-of-nodes IR, a release-scoped diagnostic map of compilation phases, and why a given transformation fired or did not. Use when a method is believed to be "not optimised", when an allocation that looks eliminable still shows up in allocation profiling, when a hot call site reports `too large` or stays non-inlined, when `made not entrant` repeats on the same method, when someone prescribes…
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
# C2 and the Sea-of-Nodes IR ## Purpose Decide _why_ a compilation came out the way it did, from the mechanism rather than from folklore. The failure this prevents is the confident non-fix: a runbook that sets `-XX:CompileThreshold` in the default C1/C2 tiered mode and changes no compilation threshold, or a refactoring that relies on the JIT to redesign an unsuitable algorithm. Start with tier/version, call-site inlining and escape state, then follow the failing transformation: type/profile stability, alias/memory dependencies, loop/range checks, vectorization, macro expansion, matching, scheduling and register pressure can each own the result. The phase model routes evidence; it is not a three-question completeness claim. ## Workflow The authoring baseline is HotSpot C2 on JDK 25 (reference measurements use Temurin 25.0.3); these are implementation details, not Java language guarantees. Before running recipes, inspect the project's toolchain, CI/runtime image and actual `java -version`, including vendor/update, product versus debug build, compiler and effective flags. Level 4 can be JVMCI rather than C2; route that compiler's internals to `graalvm-jit`. …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/c2-sea-of-nodes@sha256:605b16e0b58f9b67The 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_kecbwrig2g4or3ac)
1 badge image fetches in 30 days. What the badge shows.
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 | 12,889 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 12,706 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 11,936 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 11,744 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 10,687 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 (12889 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_kecbwrig2g4or3ac GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/c2-sea-of-nodes GET https://markdownregistry.com/api/v1/blob/605b16e0b58f9b677b1ab4fcc5d6b5fad84d87f887cd4a602dde9ca5f5cce09e
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.