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servomotor-mcp

get_hall_sensor_position

Check a motor's actual position from its hall sensors to confirm it matches the commanded position.

Instructions

Get the position as measured by the hall sensors (this should be the actual position of the motor and if everything is ok then it will be about the same as the desired position) [Firmware command "Get hall sensor position", group: Status & Monitoring.] Returns:

  • hallSensorPosition: The current position as determined by the hall sensors motor: an alias number (e.g. 88), a 16-hex-digit unique ID (e.g. "0123456789ABCDEF"), or "all" to broadcast to every motor on the bus (broadcasts get no responses back).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
motorYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.3.1

TDQS

B3.2/5.0
Behavior3/5

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

With no annotations provided, the description must carry behavioral context. It adequately discloses the read-only nature, explains the returned hallSensorPosition field, and notes that broadcast mode receives no responses. However, it does not mention possible failures, whether the motor must be connected/calibrated, or how the returned value relates to units or desired position beyond 'about the same'.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is moderately concise but slightly repetitive: 'position as measured by the hall sensors' appears twice Dispersion in the first sentence and in the Returns section. The firmware command/group annotation adds useful context but is not strictly necessary and could be trimmed.

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?

The description includes a return field, the motor parameter format, and a broadcast caveat. However, it omits practical context such as required motor connection status, possible error conditions, units of the position value, and whether the reported value is relative to a homed zero. These gaps matter for an agent deciding how to interpret and act on the result.

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%, so the description bears full responsibility for explaining the motor parameter. It does so clearly: an alias number, a 16-hex-character ID, or 'all' to broadcast, plus the important caveat that broadcasts produce no response. This adds meaningful semantics beyond the bare 'motor' property.

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 a specific verb-object action: 'Get the position as measured by the hall sensors' and contrasts it with the desired position in closed-loop control. It is immediately obvious what the tool does. It does not explicitly differentiate itself from sibling tools like get_motor_status or capture_hall_sensor_data, but the core purpose is unambiguous.

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?

The description provides no guidance on when to choose this tool over siblings such as capture_hall_sensor_data, get_status, or get_motor_status. It mentions the firmware command group and that the measured position should approximate the desired position, but does not clarify typical use cases or conditions under which an agent should prefer this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.