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roslyn:generate_constructor

Generate constructors automatically from class or struct fields and properties in C# code. Specify file location and options to create parameterized constructors with field assignments.

Instructions

Generate a constructor from fields and/or properties of a type.

USAGE: Position on class/struct declaration. Use includeProperties=true for auto-properties. OUTPUT: constructorCode string ready to paste, parameter list, and field assignments. IMPORTANT: Uses ZERO-BASED coordinates (editor line - 1).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
filePathYesAbsolute path to source file containing the type
lineYesZero-based line number on the type declaration
columnYesZero-based column number
includePropertiesNoInclude properties with setters (default: false)
initializeToDefaultNoUse ?? default for nullable types (default: false)
Behavior3/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds useful context such as the output format ('constructorCode string ready to paste, parameter list, and field assignments') and a critical implementation detail ('Uses ZERO-BASED coordinates'). However, it lacks information on permissions, error handling, or rate limits, which are important 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 well-structured with clear sections (purpose, usage, output, important note) and uses bullet-like formatting for readability. It is appropriately sized with no redundant information, though it could be slightly more concise by integrating the usage tip more seamlessly.

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?

Given the complexity of a code generation tool with 5 parameters and no output schema, the description is moderately complete. It covers purpose, usage, output format, and a key behavioral detail (zero-based coordinates), but lacks information on error cases, dependencies, or what happens if the type has no fields/properties, which would enhance completeness.

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 parameters thoroughly. The description adds minimal value by mentioning 'includeProperties=true' in the usage tip, but does not provide additional syntax, format details, or explanations beyond what the schema provides. This meets the baseline for high schema coverage.

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 specific action ('generate a constructor') and resource ('from fields and/or properties of a type'), distinguishing it from siblings like 'generate_equality_members' or 'implement_missing_members' which perform different code generation tasks. It precisely defines the tool's function without being vague or tautological.

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

Usage Guidelines4/5

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

The description provides clear context for usage ('Position on class/struct declaration') and includes a specific tip ('Use includeProperties=true for auto-properties'), which helps guide when to use certain parameters. However, it does not explicitly state when not to use this tool or name alternatives among siblings, keeping it from a perfect score.

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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