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Serial MCP Server

Serial MCP Server

by es617
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

serial.set_dtr

Set the DTR (Data Terminal Ready) control line high or low to manage device handshaking or power control.

Instructions

Set the DTR (Data Terminal Ready) control line. Usage is device-specific — check the protocol spec or ask the user.

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": {
      "connection_id": "<connection_id>",
      "value": "<value>"
    },
    "name": "serial.set_dtr"
  }
}

Input Schema

NameRequiredDescriptionDefault
connection_idYes
valueYesTrue = high, False = low.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, and the description does not disclose behavioral traits such as side effects, permissions, or prerequisites. It only warns about device-specificity.

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 a single sentence, efficiently front-loading the action and including a necessary warning.

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's simplicity and lack of output schema, the description omits important context such as prerequisites (e.g., connection must be open) and return behavior.

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

Parameters2/5

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

Only one of two parameters ('value') has a schema description, and the tool description does not add semantics for the other parameter ('connection_id') or elaborate further.

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 verb 'set' and the resource 'DTR control line', which is distinct from sibling tools like serial.set_rts and serial.pulse_dtr.

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 vague usage guidance ('Usage is device-specific — check the protocol spec or ask the user'), but does not explicitly contrast with alternatives or state when not to use.

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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