solve-math SKILL.md skillA
solve-math from h2oai/marina is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add h2oai/marina/solve-math@git:20261104.7999338Pins git:20261104.7999338 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- h2oai/marina
- Path
plugins/claude-code/skills/solve-math/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261104.7999338, committed Nov 4, 2026
- Size
- 2,165 bytes
- Repository stars
- 11
- License
- Apache-2.0
How to approach a math problem (Mathematician role and any model).
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
<!-- Generated from seeds/skills/solve-math.md by scripts/sync-claude-plugin.ts; edit the source. -->
# Procedure — solving a math question
## Step 1 — recall before reasoning
Before you compute anything, `pool math:<subfield> recall <topic>` for prior techniques. Subfields: `math:algebra`, `math:combinatorics`, `math:geometry`, `math:number-theory`, `math:calculus`, `math:probability`. If you find a relevant pattern, follow it.
## Step 2 — never trust mental arithmetic
Use the `calc` tool for every numeric computation, even simple ones. Mental math is a confidence trap. `calc` is exact and fast. Examples:
- `calc 17 * 23` → 391
- `calc polynomialRoot(6, -5, 1)` → roots of x^2 − 5x + 6 (coefficients constant term first) → [3, 2]
- `calc lusolve([[1,2],[3,4]], [5,6])` → solution of a linear system
- `calc simplify('x*2 + 3*x')`, `calc derivative('x^2', 'x')` → symbolic forms take the expression as a string
- `calc combinations(10, 3)`, `calc gcd(360, 420)`, `calc 17 mod 5`
## Step 3 — verify with an independent calc
…Read the whole file at its exact version.
How to install
mdr add h2oai/marina/solve-math@sha256:ab85a787144c445aThe line at the top of this page pins the label git:20261104.7999338, 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_zek3t5isdxypavta)
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Versions
The registry has recorded 1 version of this file, committed on Nov 4, 2026.
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 (2165 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
h2oai/marina · 11 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zek3t5isdxypavta GET https://markdownregistry.com/api/v1/resolve?ref=h2oai/marina/solve-math GET https://markdownregistry.com/api/v1/blob/ab85a787144c445ae56dd500557670b93945f5d6b834fafc047e27c5a4069de2
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.