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servomotor-mcp

read_multipurpose_buffer

Read a motor's multipurpose buffer to access calibration results, closed-loop transition data, or hall sensor captures. Specify motor by alias, ID, or broadcast.

Instructions

Read whatever is in the multipurpose buffer (the buffer is used for data generated during calibration, going to closed loop mode, and when capturing hall sensor data) [Firmware command "Read multipurpose buffer", group: Other.] Returns:

  • bufferData: The data in the buffer (the format and length of the data depends on what was put in the buffer) 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

A4.4/5.0
Behavior4/5

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

With no annotations, the description carries the full burden of behavioral disclosure. It explains that the returned bufferData has variable format and length depending on what was stored, and it warns that broadcasting to 'all' motors yields no responses. Minor gaps remain around empty-buffer or error behavior, but the core behavior is transparent.

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

Conciseness4/5

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

The description is compact and front-loaded: the action and buffer purpose come first, followed by return and parameter details in readable bullets. The firmware-command/group fragment is minor boilerplate but does not hurt clarity.

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 one-parameter read tool with no output schema, the description provides the buffer's purpose, usage contexts, the return field name, and complete parameter semantics. It does not specify edge-case behavior such as reading an empty buffer, but that is a relatively minor omission for a simple read operation.

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

Parameters5/5

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

The input schema only says motor is a string, so the description fully compensates. It documents alias numbers, 16-hex-digit unique IDs, the 'all' broadcast option, and the important no-response caveat for broadcasts.

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 opens with a concrete action and resource: 'Read whatever is in the multipurpose buffer', then explains what populates that buffer. This clearly identifies the tool's purpose and distinguishes it from sibling capture/get tools like capture_hall_sensor_data and get_hall_sensor_position.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly lists the contexts that generate buffer data: calibration, going to closed loop mode, and capturing hall sensor data. This lets an agent infer when to call this tool, though it does not explicitly name alternatives or exclusion conditions.

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