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add_connector

Creates a dependency arrow from a source variable to a target variable in a Stella system dynamics model.

Instructions

Add a connector (dependency arrow) between variables

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
to_varYesTarget variable name (the one using from_var)
from_varYesSource variable name
model_idNoSession-scoped model ID. Optional; defaults to the current model for this session.
Behavior2/5

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

Without annotations, the description must disclose behavioral traits but only says 'Add a connector'. It does not mention what happens on duplicate, whether prior connectors are overwritten, or any prerequisites like variable existence. Lacks transparency for a mutation tool.

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

Conciseness4/5

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

The description is a single concise sentence, front-loaded with the key action. It is efficient but could benefit from a brief expansion.

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

Completeness3/5

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

For a simple tool with full schema coverage and no output schema, the description is minimally adequate. However, it lacks context on the effect on the model, prerequisites, and error conditions.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema already documents all three parameters. The description adds no additional meaning beyond what is in the schema, meeting the baseline for high coverage.

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

Purpose4/5

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

The description clearly states the tool adds a connector (dependency arrow) between variables, using a specific verb and resource. It differentiates from sibling tools like set_connector_routing and sync_connectors_from_equations, though it could explicitly mention the directional nature.

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?

No guidance is provided on when to use this tool versus alternatives like set_connector_routing or sync_connectors_from_equations. Sibling tools exist but the description offers no context for selection.

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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