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codingby matlab

Code Modernization

matlab/matlab-modernize-code

Source matlab/matlab-agentic-toolkit ↗License NOASSERTION

Modernize deprecated MATLAB functions and patterns.

SkillScore92Maintained

Automatic

Coding pack

Last verified 9/2/2026

What it changes

Passed 23 of 25 test cases with the skill, and 22 of 25 without it.

Without skill88%

With skill92%

Checks it passed that the model alone missed

Sets the Evaluation option to restricted when calling str2num

1 fixed22 passed either way2 still failing0 broke

Pass-rate lift: +4 pp
Tokens: +131%
Agent turns: 0%
Response time: -12%

Model gemini-3.6-flashMeasured 9/2/2026v323 of 25 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/matlab-matlab-modernize-code/SKILL.md https://app.decimal.ai/s/matlab-matlab-modernize-code/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add matlab-matlab-modernize-code, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/matlab-matlab-modernize-code/ and pins it in .decimal/skills.lock

decimalai skills add matlab-matlab-modernize-code

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/matlab-matlab-modernize-code/SKILL.md https://app.decimal.ai/s/matlab-matlab-modernize-code/SKILL.md

Raw file: /s/matlab-matlab-modernize-code/SKILL.md ↗ · machine-readable summary at /s/matlab-matlab-modernize-code.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

A test case the skill fixed. Same model, same prompt, with and without the skill.

Prompt

A web service endpoint in MATLAB parses numeric array input strings using `str2num`. Security reviewers warned that this call can execute arbitrary workspace code. How should `str2num` be invoked to restrict expression evaluation?

What was checked, without and with the skill
Checked	Without skill	With skill
Sets the Evaluation option to restricted when calling str2num	Missed	Passed

case-07 · gemini-3.6-flash · 9/2/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md159 lines11 files

Code Modernization

Replace removed or discouraged MATLAB functions and anti-patterns with modern equivalents. This skill is the resolver — the MCP tool check_matlab_code (MATLAB's Code Analyzer) is the detector.

Terms used in this skill:

Removed — the function is no longer in MATLAB; calling it errors.
Discouraged — the function still works, but a better API exists. It may or may not be slated for removal in a future release.

When to Use

check_matlab_code reports a lifecycle diagnostic — any of these three wordings, matched case-insensitively (STRMATCH is not recommended is the same signal as the lowercase form):
- 'X' is not recommended... (severity: info)
- 'X' will be removed in a future release... (severity: warning)
- 'X' has been removed... (severity: error — the code errors today)
Code uses a discouraged pattern Code Analyzer does not flag — e.g. containers.Map, bsxfun, str2num, eval, clear all — scan the source, not just the diagnostics (see Conventions)
User asks to modernize, migrate, or update old MATLAB code
Code uses functions listed in the quick reference table below
After static analysis reveals removed or discouraged API usage
Writing new code in a domain that has known removed or discouraged patterns

When NOT to Use

This skill swaps removed or discouraged APIs for modern equivalents. It does not:

Review code quality broadly
Debug runtime behavior (removed-function errors excepted — those are modernization fixes)
Optimize already-correct code for speed → hand off to matlab-optimize-performance
Write or migrate function input/output validation (arguments blocks, inputParser/validateattributes → mustBe* validators, repeating args, name-value forwarding) → hand off to matlab-validate-function-arguments

Quick Reference: Removed, Discouraged & Anti-Patterns

Topic	Recommendation	Since	Category	Rationale
`csvread` / `dlmread`	`readmatrix`	R2019a	File I/O
`csvwrite` / `dlmwrite`	`writematrix`	R2019a	File I/O
`xlsread`	`readtable`, `readmatrix`	R2019a	File I/O
`xlswrite`	`writetable`, `writematrix`	R2019a	File I/O
`datenum` / `datestr` / `now`	`datetime` (use `string`/`char` to format)	R2022b	Date/Time (Not recommended)	Flagged by Code Analyzer

Track record

Benchmark

23 / 25

test cases passed, vs 22 / 25 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan14 of 15 checks clean

0 critical · 0 warning · 1 info — scanner v5 — 9/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

No issues (informational notes only).

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

matlab / matlab-agentic-toolkit

skills-catalog/matlab-software-development/matlab-modernize-code/SKILL.md

View on GitHub ↗

License https://www.mathworks.com/content/dam/mathworks/license/pmrl/license.mdImported 9/2/2026Version v3Bundled 10 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Code Modernization

When to Use

When NOT to Use

Quick Reference: Removed, Discouraged & Anti-Patterns

Track record

Benchmark

Adoption

SkillSafety

Source

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