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Vensim MCP

Vensim MCP

by Cybing521
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python

open_vensim_model

Open a Vensim .mdl file in the locally installed Vensim application to view and interact with the model.

Instructions

Open a .mdl in the locally installed Vensim application.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "model_path": "<model_path>"
    },
    "name": "open_vensim_model"
  }
}

Input Schema

NameRequiredDescriptionDefault
model_pathYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations, the description carries the full burden of behavioral disclosure. It does state that the action opens a model in the local Vensim application, but it does not mention side effects, whether the call returns before or after the app opens, error behavior when Vensim is missing, or whether any model data is returned.

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 one efficient sentence with no filler. It front-loads the action and resource, then places the environment detail at the end. Every word earns its place.

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?

Even though this is a simple one-parameter tool, there are no annotations and no output schema, so the description must be richer by itself. It omits what the agent should expect after invocation, such as whether the function returns immediately after launching Vensim, and it does not help disambiguate from sibling model 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 add meaning to model_path. It implies the path points to a .mdl file, but it does not clarify absolute vs relative paths, extension handling, or invalid-path behavior. The description adds only a little beyond the schema's 'Model Path' title.

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 names a specific verb ('Open'), a target resource ('.mdl' model files), and a concrete environment (locally installed Vensim application). This clearly distinguishes it from siblings like generate_vensim_model, inspect_vensim_model, and validate_vensim_model, which do different operations.

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

Usage Guidelines2/5

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

There is no guidance about when to choose this tool over siblings, nor any stated exclusions or conditions. An agent is left to infer that opening is appropriate when an interactive Vensim session is desired, but no alternatives or explicit usage context are mentioned.

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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