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U-C4N
by U-C4N

Execute AutoLISP

system_run_lisp

Execute AutoLISP expressions via COM backend to automate AutoCAD tasks, modify drawing settings, or run custom commands.

Instructions

Execute an AutoLISP expression (COM backend only).

Example: '(setvar "DIMSCALE" 1.0)'

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
expressionYesAutoLISP expression to evaluate (e.g. '(command "ZOOM" "E")')

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

Description adds no behavioral detail beyond the readOnlyHint=false annotation; does not disclose potential side effects, permissions, or error behavior.

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?

Extremely concise: one sentence and an example. Front-loaded with purpose, no extraneous text.

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 power of arbitrary LISP execution, the description lacks safety notes, scope, and behavior context. Minimal completeness for a potentially risky tool.

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%; the description provides an example but no new semantic info beyond what the parameter description already offers.

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?

Clearly states it executes AutoLISP expressions, including a COM backend note. Distinguishes implicitly from sibling 'system_run_command' but could be more explicit.

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 explicit when-to-use or when-not-to-use guidance; does not mention alternatives or preconditions, leaving the agent to infer from context.

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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