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Allen Brain API MCP Server

by maflot

get_atlases

Retrieve available brain atlases from the Allen Institute API. Specify the maximum number of rows to return.

Instructions

Retrieve atlases available through the API (from OntologiesApi).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
numRowsNoMaximum number of rows (default is 50).
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only says 'retrieve,' implying a read operation, but does not mention pagination behavior, rate limits, or any side effects. The numRows parameter hints at pagination but is not explained.

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, concise sentence that states the tool's purpose without extraneous words. It is front-loaded and efficient.

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 has one parameter and no output schema, the description should provide context on return format, default behavior, or typical use cases. It only states the source (OntologiesApi) and basic retrieval, which is insufficient for full understanding.

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% and the parameter description already states 'Maximum number of rows (default is 50).' The description adds no extra meaning beyond what the schema provides. Baseline 3 is appropriate.

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?

The description clearly states the tool retrieves atlases from the OntologiesApi, specifying the resource and action. It differentiates from sibling tools like get_structures or get_products by focusing on atlases specifically.

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 guidance is provided on when to use this tool versus other retrieval tools. There are no indications of prerequisites, context, or alternatives.

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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