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Agent skill

Simulink Simulation

by hashgraph-online in hashgraph-online/awesome-codex-plugins

A skill your agent uses whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or…

Apache-2.0Auto-check passed

Install Simulink Simulation

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill simulink-simulation -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins simulink-simulation --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/summer521521/MATLAB_Simulink_plugin/skills/simulink-simulation .claude/skills/simulink-simulation && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
simulink-simulation
GitHub stars
1.2k
Token cost
~1.6k tokens
SKILL.md length
552 words
Files
1
Skills in repo
736
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or…

  • Simulating a Simulink model
  • SKILL.md covers Minimal working pattern, Setting parameters, Input signals and Discovering logged signals, plus 5 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Running the sim command

What it does

Simulink Simulation is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or block parameters programmatically, or accessing logged output data from SimulationOutput. Trigger for any request involving sim(), Simulink.SimulationInput, Simulink.SimulationOutput, logsout, setExternalInput, or setModelParameter.

Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Model Context Protocol. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.

When your agent uses it

  • Simulating a Simulink model
  • Running the sim command
  • Setting up SimulationInput objects
  • Passing input signals via timeseries

Example prompts

  • “/simulink-simulation”

What it can do on your machine

Read from SKILL.md and the folder at commit 16b4156. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are matlab).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Simulink Simulation loads about 1.6k tokens when it runs. Until then it costs about 109 tokens; SKILL.md has 552 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~109
When it runs · the whole SKILL.md, loaded when a task matches
~1.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 16b4156, republished under its Apache-2.0 licence (© hashgraph-online). 552 words, ~1,618 tokens.

Download SKILL.mdSave it as .claude/skills/simulink-simulation/SKILL.md (or your agent's skills folder).
name
simulink-simulation
description
Use this skill whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or block parameters programmatically, or accessing logged output data from SimulationOutput. Trigger for any request involving sim(), Simulink.SimulationInput, Simulink.SimulationOutput, logsout, setExternalInput, or setModelParameter.

Minimal working pattern

Always simulate using Simulink.SimulationInput and Simulink.SimulationOutput:

matlab
in = Simulink.SimulationInput('MyModel');
in = in.setModelParameter('StopTime', '10');
out = sim(in);

Never use set_param, load_system, or open_system to drive simulation — the SimulationInput API replaces all of these.

If the MATLAB MCP tool is unavailable but the user explicitly asks for real artifacts such as .slx, exported figures, or .mat results, use local MATLAB execution such as matlab -batch as a fallback. Give MATLAB generous timeouts because startup alone can take minutes.

For MATLAB MCP core server v0.9.0 and newer, this personal plugin launcher can pass through optional session/logging settings via environment variables:

  • MATLAB_SESSION_MODE -> --matlab-session-mode
  • MATLAB_EXTENSION_FILE -> --extension-file
  • MATLAB_EXTENSION_FILES -> repeated --extension-file values, separated by the OS path separator (; on Windows)
  • MATLAB_LOG_FOLDER -> --log-folder
  • MATLAB_LOG_LEVEL -> --log-level

MATLAB MCP core server v0.9.2 improves --initialize-matlab-on-startup=true so the MCP server is not blocked while MATLAB starts, and fixes shareMATLABSession() failures on Windows. Keep the launcher default lazy startup unless the user explicitly wants startup-time initialization.

MATLAB MCP core server v0.10.0 makes auto the default session mode. Leave MATLAB_SESSION_MODE unset for normal use, set it to existing only when the user has run shareMATLABSession() in the target MATLAB session, and use multiple extension files only when the current MCP server exposes those custom tools.

Keep MATLAB_SETUP_MATLAB unset for normal MCP sessions; set it only for a one-time upstream setup run.

Setting parameters

Use SimulationInput methods to configure the simulation:

matlab
% Model-level parameters (StopTime, SolverType, SimulationMode, etc.)
in = in.setModelParameter('StopTime', '10', 'SolverType', 'Fixed-step');

% Block parameters
in = in.setBlockParameter('MyModel/Gain', 'Gain', '5');

% MATLAB workspace variables used by the model
in = in.setVariable('Kp', 1.2);

Input signals

Pass input signals through Inport blocks using a Simulink.SimulationData.Dataset. Each timeseries Name must match the corresponding Inport block's signal name, otherwise the signal won't be routed correctly.

matlab
dt = 0.01; % sample time
N = 1000; % Number of points
t = dt*(0:N)';
u = sin(2*pi*t);

ts = timeseries(u, t);
ts.Name = 'mySignal';   % must match the Inport signal name in the model

ds = Simulink.SimulationData.Dataset;
ds{1} = ts;

in = in.setExternalInput(ds);
out = sim(in);

Discovering logged signals

Before accessing logged data by name, discover what signals the model actually logs by running a simulation and inspecting logsout:

matlab
in = Simulink.SimulationInput('MyModel');
out = sim(in);
disp('List of logged signals:');
disp(out.logsout.getElementNames);

This is especially useful when working with an unfamiliar model — the names returned here are exactly the names to use when calling out.logsout.get(...).

Accessing logged data

Logged signals are available through out.logsout. Access them directly by name — no intermediate variables needed:

matlab
% Plot a logged signal
plot(out.logsout.get('signalName').Values)

% Get time and data separately
sig = out.logsout.get('signalName').Values;
plot(sig.Time, sig.Data)

Do not validate out with try-catch or isfield — sim either returns a valid SimulationOutput or throws an error. Simulink.SimulationOutput has no isfield method.

Show full SKILL.md (210 more words)Show less

Accessing To Workspace Outputs

If the model uses To Workspace blocks and ReturnWorkspaceOutputs is on, retrieve those outputs directly from the SimulationOutput object:

matlab
in = Simulink.SimulationInput('MyModel');
in = in.setModelParameter('ReturnWorkspaceOutputs', 'on');
out = sim(in);

T = out.simout_T;
Q = out.simout_Qbase;

Normalize the exported value before post-processing because To Workspace may return a timeseries, a Simulink.SimulationData.Signal, or a numeric matrix depending on block settings:

matlab
if isa(T, 'timeseries')
    t = T.Time(:);
    y = T.Data(:);
elseif isa(T, 'Simulink.SimulationData.Signal')
    t = T.Values.Time(:);
    y = T.Values.Data(:);
else
    t = T(:,1);
    y = T(:,2);
end

Multiple simulations

When running many simulations, create an array of Simulink.SimulationInput objects using the repmat function instead of looping over sim:

matlab
in = repmat(Simulink.SimulationInput('MyModel'),N,1);
for k = 1:N
    in(k) = Simulink.SimulationInput('MyModel');
    in(k) = in(k).setVariable('gain', gains(k));
end
out = sim(in);

When collecting results from multiple cases into a struct array, preallocate a homogeneous struct shape before the loop. MATLAB will throw "subscripted assignment between dissimilar structures" if later cases add fields or nested layouts that the first element did not have.

Parallel simulation (parsim)

To run multiple simulations, use parsim instead of looping over sim:

matlab
for k = 1:N
    in(k) = Simulink.SimulationInput('MyModel');
    in(k) = in(k).setVariable('gain', gains(k));
end
out = parsim(in);

Rebuild-and-Simulate Pitfalls

If a script repeatedly rebuilds and reruns a model:

  • Save or clear the dirty flag before close_system, otherwise MATLAB can warn that the changed model cannot be closed.
  • Avoid model names that shadow scripts or functions on the MATLAB path; model/script name collisions can produce confusing warnings during sim and run.
  • When a generated model relies on MATLAB Function blocks with workspace parameters, make sure those symbols are declared as block parameters during model construction; otherwise simulation can fail before sim starts with output-size/type inference errors.

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/summer521521/MATLAB_Simulink_plugin/skills/simulink-simulation of hashgraph-online/awesome-codex-plugins.

Open the folder on GitHubat commit 16b4156

Compare with similar skills

Simulink Simulation next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Simulink Simulation compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Simulink Simulation this skillhashgraph-online/awesome-codex-plugins1.2k—~1.6kAutomated safety check: PassApache-2.0
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MCP Server BuildershareAI-lab/learn-claude-code78k5 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official37k11 repos~3.1kAutomated safety check: PassApache-2.0
Figma use_figma Plugin API Ruleswarpdotdev/warp65k4 repos~4.4kAutomated safety check: PassAGPL-3.0
Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills8.4k6 repos~3.2kAutomated safety check: NotesApache-2.0

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Works with

Questions about Simulink Simulation

What does Simulink Simulation do?

A skill your agent uses whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or…. Simulink Simulation is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill whenever simulating a Simulink model, running the sim command, setting up SimulationInput objects, passing input signals via timeseries or datasets, configuring model or block parameters programmatically, or accessing logged output data from SimulationOutput.

When should I use Simulink Simulation?

Simulink Simulation fits situations like: simulating a Simulink model; running the sim command; setting up SimulationInput objects; passing input signals via timeseries.

How do I install Simulink Simulation in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill simulink-simulation -a claude-code`. Or copy the skill folder (plugins/summer521521/MATLAB_Simulink_plugin/skills/simulink-simulation in hashgraph-online/awesome-codex-plugins) into .claude/skills/simulink-simulation in your project. Claude Code loads it when a task matches its description.

How do I install Simulink Simulation in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill simulink-simulation -a codex`. Or copy the skill folder (plugins/summer521521/MATLAB_Simulink_plugin/skills/simulink-simulation in hashgraph-online/awesome-codex-plugins) into .agents/skills/simulink-simulation in your project. Codex loads it when a task matches its description.

Can I use Simulink Simulation in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill simulink-simulation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/simulink-simulation, .gemini/skills/simulink-simulation, .github/skills/simulink-simulation and .opencode/skills/simulink-simulation in your project.

What does Simulink Simulation need to run?

SKILL.md names no scripts, command-line tools or credentials: Simulink Simulation is instructions for the agent only.

Does Simulink Simulation access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Simulink Simulation safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Simulink Simulation use?

Simulink Simulation is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Simulink Simulation use?

About 1.6k tokens (SKILL.md is roughly 6.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Simulink Simulation?

Skills that share tags, products or a category with Simulink Simulation: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 37k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Simulink Simulation?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,232 GitHub stars. The repository holds 736 skills in this directory. The repository was last updated on October 6, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.