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mcp-servers-for-revit

MCP server for Revit - Python

list_families

Retrieve a flat list of family types from the current Revit model. Optionally filter by substring of family or type name.

Instructions

Get a flat list of available family types in the current Revit model. Use contains to filter by a substring of the family or type name (case-insensitive).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
containsNo
limitNo
Behavior2/5

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

No annotations provided, so description must convey behavioral traits. It indicates a read operation ('get') but doesn't disclose side effects, required document state, or pagination behavior. Lacks depth needed to fully inform safe invocation.

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?

Two sentences, no filler. First sentence states purpose, second gives actionable usage hint. Efficient and front-loaded.

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?

Covers basic functionality and filter option, but lacks output format details, prerequisites (e.g., open document), and explanation of 'limit' parameter. Adequate but leaves gaps for an agent.

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 0%, so description must compensate. It explains the 'contains' parameter well (filter by substring, case-insensitive) but does not explain 'limit' parameter (default 50, role unclear). Partial compensation.

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?

Clearly states it gets a flat list of family types in the Revit model, specifying the resource (family types) and action (get). Differentiates from siblings like list_family_categories by focusing on types rather than categories.

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?

Provides guidance on using the 'contains' parameter for filtering with case-insensitive substring match, but does not mention when to use this tool versus alternatives like list_family_categories or any prerequisites.

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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