embedded-mcp

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serial_read

Retrieve recent serial output from an embedded board by providing its board ID. Optionally set a timeout to wait and collect logs or command responses for debugging.

Instructions

Wait and read recent serial output from the board.

Args: board_id: The identifier of the board (e.g. 'board_a') timeout_ms: Duration in milliseconds to wait and collect (default: 500)

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": {
      "board_id": "<board_id>"
    },
    "name": "serial_read"
  }
}

Input Schema

Name	Required	Description	Default
`board_id`	Yes
`timeout_ms`	No

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Sep 9, 2026

TDQS

A3.6/5.0

Behavior3/5

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

No annotations are provided, so the description carries the behavioral disclosure burden. It does reveal blocking/waiting behavior by saying 'Wait' and describing timeout_ms as 'Duration in milliseconds to wait and collect.' However, it does not clarify whether an active connection or prior serial_acquire is required, or whether reading consumes buffered output.

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 compact and front-loaded: one clear purpose sentence followed by two concise argument definitions. There is no filler or redundant elaboration.

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 is sufficient for a basic read call, and the output schema likely covers return shape. However, given the sibling set and lack of annotations, it leaves the operational relationship to serial_connect, serial_acquire, and serial_tail unstated. An agent cannot tell whether a prior connection or exclusive access is needed.

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?

The input schema provides only names, types, and a default, with 0% description coverage. The description compensates by explaining board_id as an identifier with an example and timeout_ms as a millisecond wait/collect duration with its default. This is adequate semantics for both parameters.

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 uses a specific verb and resource: 'Wait and read recent serial output from the board.' It clearly states what the tool does, but it does not explicitly distinguish itself from related siblings like serial_tail or serial_exchange.

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 implies the tool is for one-shot timed reads of recent serial output, and the timeout parameter suggests a wait-and-collect behavior. However, it never states when to choose this over serial_tail or serial_exchange, nor does it mention prerequisites like connecting or acquiring the board.

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