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update_flow

Update flow fields in a Stella system dynamics model while preserving existing structural links between stocks. Modify equation, units, or graphical function to adjust flow behavior.

Instructions

Update flow fields while preserving structural stock links

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
model_idNoSession-scoped model ID. Optional; defaults to the current model for this session.
nameYesFlow name
equationNoFlow rate equation
unitsNoUnits
non_negativeNoPrevent negative values
xNoX position
yNoY position
graphical_functionNoGraphical function (lookup table) definition
Behavior3/5

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

Annotations indicate readOnlyHint=false (write) and destructiveHint=false (non-destructive). The description adds 'preserving structural stock links', which offers safety context. However, it lacks details on overwrite behavior, permissions, or side effects beyond that.

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 wasted words. It conveys the essential purpose and key nuance efficiently.

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?

Given the tool's complexity (8 params, nested object, no output schema), the description is too minimal. It does not explain return values, confirm success, or note prerequisites like requiring the flow to exist.

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 coverage is 100% with detailed descriptions for all 8 parameters, including nested objects. The description adds no additional parameter meaning beyond the schema, so baseline score of 3 is appropriate.

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 the verb 'Update', the resource 'flow fields', and adds a specific nuance 'preserving structural stock links' which distinguishes it from sibling tools like add_flow or delete_variable.

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 description implies usage for modifying existing flows but does not explicitly state when to use versus alternatives (e.g., add_flow, update_stock). No exclusionary guidance or prerequisites are provided.

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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