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mcp-esp32

mcp-esp32

by 0mandrock1
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

tail_serial

Capture raw serial output from an ESP32 for up to 30 seconds, bypassing the REPL protocol to monitor boot logs or debug prints directly.

Instructions

Capture raw serial output for up to 30 seconds without going through the REPL protocol.

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": "<port>"
    },
    "name": "tail_serial"
  }
}

Input Schema

NameRequiredDescriptionDefault
portYes
secondsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4/5.0
Behavior3/5

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

With no annotations provided, the description carries the full burden. It discloses a 30-second time limit and the fact that it bypasses the REPL protocol, offering some behavioral context. Yet it does not state whether the operation is read-only, how output is delivered, or any side effects, leaving 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 a single, concise sentence that front-loads the core action and key constraints. Every word contributes meaning with no redundancy or filler.

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 simple tool with two parameters and no output schema, the description adequately covers the purpose and key constraint. It could mention the output format or prerequisites, but overall it is complete enough for a straightforward capture tool within a device tool suite.

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?

Schema description coverage is 0%, so the description must compensate. It adds meaning to 'seconds' by mentioning 'up to 30 seconds', but does not clarify the 'port' parameter beyond its self-explanatory name. It does not mention the default value for seconds, which the schema provides, so coverage remains partial.

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 uses the specific verb 'Capture' and clearly identifies the resource as 'raw serial output', distinguishing it from REPL-based operations. The phrase 'without going through the REPL protocol' explicitly differentiates it from the sibling tool repl_exec.

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 implies this tool is for capturing raw serial data when REPL protocol is not desired, providing clear context. However, it does not explicitly name alternatives or explain when not to use it, so it falls short of a 5.

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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