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Cybing521

Vensim MCP

by Cybing521

generate_vensim_model

Generate a styled, runnable Vensim .mdl file from a JSON model specification for simulation.

Instructions

Generate a styled, runnable .mdl file from a JSON model specification.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
spec_jsonYes
output_pathYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. First observedv0.1.0

TDQS

B3.3/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full behavioral disclosure burden. It reveals that a file is generated, but does not disclose whether an existing output_path is overwritten, what happens on invalid input, what side effects occur, or what the tool returns. These are meaningful gaps for a file-creating operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no filler. Every word contributes meaning, including the useful qualifiers 'styled' and 'runnable' that set output expectations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with no output schema and no annotations, the description is too thin to be complete. It does not explain the return value, the output_path semantics, overwrite behavior, or how this tool fits into the workflow with the sibling validation and inspection tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It gives some meaning to spec_json by calling it a 'JSON model specification', but it says nothing about output_path or the expected structure of the JSON. The parameter names are self-explanatory to a degree, but the description does not provide the needed detail.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states a specific action ('Generate'), a concrete resource ('.mdl file'), and the input source ('JSON model specification'). This distinguishes it from sibling tools that validate, inspect, render, or open Vensim models, and from create_vensim_dss_script which produces a different artifact.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The usage context is implied: use this tool when you have a JSON model specification and need a runnable .mdl file. However, it does not explicitly mention when not to use it or reference any sibling alternatives, leaving routing mostly to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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