neqsim-phase-envelope SKILL.md skillA
neqsim-phase-envelope from equinor/neqsim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add equinor/neqsim/neqsim-phase-envelope@git:20261026.6caba99Pins git:20261026.6caba99 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- equinor/neqsim
- Path
.github/skills/neqsim-phase-envelope/SKILL.md- Versions recorded
- 8
- Latest version
- git:20261026.6caba99, committed Oct 26, 2026
- First version recorded
- Jul 11, 2026
- Size
- 15,021 bytes
- Repository stars
- 167
- License
- Apache-2.0
Generate, plot, interpret, validate, and troubleshoot NeqSim PT phase envelopes. USE WHEN: calculating phase envelopes, dew and bubble curves, cricondenbar, cricondentherm, critical points, retrograde regions, envelope segments, or fixing Michelsen continuation and singular-Jacobian failures caused by zero or trace components.
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
# NeqSim PT Phase Envelopes ## Overview Use this skill to generate physically interpretable PT phase envelopes and to modify the Michelsen continuation solver safely. Prefer the structured segment API, verify branch identity from physics, and preserve the caller's thermodynamic system. ## Route the Task - Use `@thermo-fluid` for envelope generation, plotting, properties, and solver defects. - Chain to `neqsim-eos-regression` or `@pvt-simulation` when matching lab data or tuning EOS parameters. - Chain to `neqsim-flow-assurance` for operating-path, hydrate, wax, or pipeline assessments. - Chain to `neqsim-ccs-hydrogen` for CO2/H2 impurity envelopes. - Chain to `neqsim-troubleshooting` when continuation does not converge or output is incomplete. ## Workflow ### 1. Verify the API and inputs Read these sources before generating or changing code: - `ThermodynamicOperations.calcPTphaseEnvelope(...)` and `getEnvelopeSegments()` - `PTPhaseEnvelopeMichelsen` result getters and continuation settings - `EnvelopeSegment` getters and `PhaseType` - Neighboring tests in `PTPhaseEnvelopeMichelsenTest`, `PTPhaseEnvelopeRobustnessTest`, and `PTPhaseEnvelopeSegmentsTest` …
Read the whole file at its exact version.
How to install
mdr add equinor/neqsim/neqsim-phase-envelope@sha256:756b5d46cd24910cThe line at the top of this page pins the label git:20261026.6caba99, 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_crdrbnaac36jksfw)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Jul 11, 2026 and Oct 26, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261026.6caba99 latest | 2026-10-26 | 6caba99 | 15,021 B | A | view · diff |
| git:20261010.7b9e40b | 2026-10-10 | 7b9e40b | 14,254 B | A | view · diff |
| git:20260919.77c34a0 | 2026-09-19 | 77c34a0 | 13,619 B | A | view · diff |
| git:20260915.c675924 | 2026-09-15 | c675924 | 13,619 B | A | view · diff |
| git:20260912.c5ddb97 | 2026-09-12 | c5ddb97 | 12,016 B | A | view · diff |
| git:20260821.47a11f5 | 2026-08-21 | 47a11f5 | 11,988 B | A | view · diff |
| git:20260815.36b64de | 2026-08-15 | 36b64de | 10,418 B | A | view · diff |
| git:20260711.237b368 | 2026-07-11 | 237b368 | 9,151 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 (15021 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
equinor/neqsim · 167 stars · license Apache-2.0 · pushed 2026-11-08 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_crdrbnaac36jksfw GET https://markdownregistry.com/api/v1/resolve?ref=equinor/neqsim/neqsim-phase-envelope GET https://markdownregistry.com/api/v1/blob/756b5d46cd24910c634a4ebfc6728ea2bc17418889e71ac3c4e4890b0df5872a
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.