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anarcoiris

nina-mcp

by anarcoiris

nina_focuser_move

Moves the telescope focuser to a specified absolute step position for precise focusing. Input the target step count to set focus.

Instructions

Move the focuser to a specific absolute step position.

position: Target absolute position in steps. Must be >= 0.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
positionYes
Behavior3/5

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

No annotations provided, so description must cover behavior. It states 'absolute step position' and constraint '>=0', but doesn't disclose bounds checking, synchronous behavior, or error handling.

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 front-loaded sentences: purpose first, then parameter detail. No unnecessary 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?

For a simple tool with one parameter and no output schema, description is adequate. Could mention if position is absolute relative to zero, but 'absolute' is stated.

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?

With 0% schema coverage, description adds essential meaning: 'Target absolute position in steps. Must be >= 0.' Adds constraint and clarity beyond the schema.

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 'Move the focuser to a specific absolute step position', using a specific verb and resource, and distinguishes from sibling tools like nina_focuser_stop.

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?

Implicitly says to use when moving focuser absolutely, but no explicit when-to-use or when-not, and no alternatives mentioned.

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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