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Malloy MCP Server

by namabile

list_models

List all Malloy models available in a specified package, with an optional project name.

Instructions

List models for a package.

Args:
    project_name: The name of the project, defaults to "home"
    package_name: The name of the package to list models for

Returns:
    List[Model]: List of Malloy models

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
project_nameNohome
package_nameNo
Behavior3/5

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

No annotations are provided, so the description bears full burden. It discloses that the tool lists models and returns a list, but does not mention read-only nature, authentication requirements, or side effects. This is adequate but not rich.

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 extremely concise with two short sentences plus parameter docs. Front-loaded with the main purpose, no wasted words.

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

Completeness4/5

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

Given no output schema, the description specifies return type (List[Model]). It covers the basic function well but omits details like error behavior or handling of missing package_name. Still mostly complete for a simple list tool.

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

Parameters4/5

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

Schema coverage is 0%, but the description adds descriptive text for both parameters (e.g., 'The name of the project, defaults to "home"'). This adds meaning beyond the schema's defaults, though details remain minimal.

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 'List models for a package,' with a specific verb and resource. It distinguishes from sibling tools like get_model (single model) and list_packages/list_projects (different entities).

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 listing models but lacks explicit guidance on when to use this tool versus alternatives like get_model. No exclusion criteria or context cues 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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