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serial-mcp

serial-mcp

by davidalo
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

send_break

Initiate protocol-specific communication by sending a BREAK signal on a serial port. Configure the duration the TX line stays low.

Instructions

Send a BREAK signal on the serial port.

A BREAK is a special signal where the TX line is held low for a specified duration, used for various protocols.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "port_id": "<port_id>"
    },
    "name": "send_break"
  }
}

Input Schema

NameRequiredDescriptionDefault
port_idYesThe port identifier
durationNoDuration of break signal in seconds

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.4.0

TDQS

A3.5/5.0
Behavior2/5

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

No annotations are provided, so the description must fully disclose behavior. It only explains the BREAK signal (TX line held low) but does not describe side effects, blocking behavior, or port state changes, leaving significant behavioral gaps.

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 two concise sentences, immediately stating the action and providing key context. No unnecessary words, with front-loaded purpose.

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?

For a simple tool with 2 parameters and no output schema, the description covers the basic use case. However, lacking behavioral details (transparency gap) and usage guidance reduces completeness to adequate but not thorough.

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?

Input schema has 100% coverage with clear descriptions for port_id and duration. The description does not add extra meaning beyond what the schema already provides, so a baseline score of 3 is appropriate.

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 the tool's purpose: 'Send a BREAK signal on the serial port.' It explains what a BREAK is, making the action specific and distinct from sibling tools like close_port, read_bytes, etc.

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 provides clear context about what the tool does but does not explicitly state when to use it over alternatives or exclude cases. The sibling tools list offers implicit differentiation, but no direct guidance is given.

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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