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Protocolo MCP

Model Context Protocol v2024-11-05 via stdio. Transporte JSON-RPC 2.0, 13 ferramentas nativas implementadas em C, parsing de mensagens zero-copy.

v2024-11-05MCP Version
stdioTransport
13Tools
JSON-RPC 2.0Protocol

Visão geral

scorpiox code implementa o Model Context Protocol (MCP) como servidor C nativo. A camada MCP funciona sobre stdio usando framing JSON-RPC 2.0 — o cliente AI conecta via stdin/stdout e chama ferramentas através de mensagens JSON estruturadas. Todas as 13 ferramentas são compiladas no binário a partir de sx_tools.c sem dependências em tempo de execução.

# MCP server architecture (from sx_tools.c)

stdin  ──▶  JSON-RPC parser  ──▶  tool dispatcher  ──▶  result  ──▶  stdout

# All tools compiled into single static binary
# Source: scorpiox/libsxutil/sx_tools.c
# Zero runtime dependencies — no Node.js, no Python, no JVM

Camada de Transporte

The MCP server uses stdio as its transport — the simplest, most reliable pipe. The AI client spawns the scorpiox binary and communicates via stdin/stdout using newline-delimited JSON-RPC 2.0 messages. No HTTP server, no WebSocket, no port binding. 

# Transport: stdio (stdin/stdout)
# Framing: newline-delimited JSON-RPC 2.0
# Each message is a single JSON object terminated by \n

# Client sends request →
{"jsonrpc": "2.0", "id": 1, "method": "tools/list", "params": {}}

# Server responds ←
{"jsonrpc": "2.0", "id": 1, "result": {"tools": [...]}}

Handshake de Inicialização

Before calling tools, the client must complete the MCP initialization handshake. This establishes the protocol version and declares capabilities. 

# Step 1: Client sends initialize request
{"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {
  "protocolVersion": "2024-11-05",
  "capabilities": {},
  "clientInfo": {"name": "claude-ai", "version": "1.0"}
}}

# Step 2: Server responds with capabilities
{"jsonrpc": "2.0", "id": 1, "result": {
  "protocolVersion": "2024-11-05",
  "capabilities": {"tools": {}},
  "serverInfo": {"name": "scorpiox-code", "version": "1.0.0"}
}}

# Step 3: Client sends initialized notification
{"jsonrpc": "2.0", "method": "notifications/initialized", "params": {}}

Métodos JSON-RPC

The MCP server handles 4 JSON-RPC methods. All tool invocations go through tools/call.

Método Direção Description
initialize client → server Initialize MCP session with protocol version and client capabilities
notifications/initialized client → server Notification sent after successful initialization handshake
tools/list client → server List all tools available from the MCP server
tools/call client → server Call a specific tool with JSON arguments and receive result 
# Example: calling the Bash tool
{"jsonrpc": "2.0", "id": 42, "method": "tools/call", "params": {
  "name": "Bash",
  "arguments": {"command": "ls -la /tmp", "timeout": 5000}
}}

# Server response
{"jsonrpc": "2.0", "id": 42, "result": {
  "content": [{"type": "text", "text": "total 48\ndrwxrwxrwt 12 root root ..."}],
  "isError": false
}}

Catálogo de Ferramentas (13)

All tools are implemented in scorpiox/libsxutil/sx_tools.c and compiled into the static binary. Each tool declares a JSON Schema for input validation.

Bash shell

Execute a bash command

Parâmetros: command, timeout
Obrigatório: command
ReadImage filesystem

Read an image file and display it visually

Parâmetros: file_path
Obrigatório: file_path
ReadDocs web

Fetch URL content as markdown via headless browser

Parâmetros: url, format, wait_ms
Obrigatório: url
WebSearch search

Search the web using 11 engines concurrently

Parâmetros: query
Obrigatório: query
TaskManager workflow

Manage persistent tasks with create/add/complete

Parâmetros: action, query, task_id, step_id, text
Obrigatório: action, query
PlanMode workflow

Manage plan mode for complex tasks

Parâmetros: action, goal, plan_file
Obrigatório: action
AskUserQuestion interaction

Ask interactive multiple-choice questions via TUI

Parâmetros: questions_json
Obrigatório: questions_json
InvokeSkill workflow

Invoke a skill by name for reusable workflows

Parâmetros: skill_name, arguments
Obrigatório: skill_name
BackgroundBash shell

Execute bash command in background, returns immediately

Parâmetros: command
Obrigatório: command
ReadBgOutput shell

Read new output from a background task

Parâmetros: task_id
Obrigatório: task_id
ListBgTasks shell

List all background tasks with status and runtime

Parâmetros: —
Obrigatório: —
KillBgTask shell

Kill a running background task by ID

Parâmetros: task_id
Obrigatório: task_id
SetCallback workflow

Manage scheduled callback messages with repeats

Parâmetros: action, message, delay_seconds, repeat_count, callback_id
Obrigatório: action

Referência de Esquema de Ferramentas

Complete input_schema for each tool, as declared in the tools/list response.

Bash shell
ParâmetrosTypeStatusDescription
command string required The bash command to execute
timeout integer optional Timeout in milliseconds (default: 30000)
ReadImage filesystem
ParâmetrosTypeStatusDescription
file_path string required The absolute path to the image file
ReadDocs web
ParâmetrosTypeStatusDescription
url string required The URL to fetch
format string optional Output format: text, html, or markdown
wait_ms integer optional Wait time for page load in ms
WebSearch search
ParâmetrosTypeStatusDescription
query string required The search query
TaskManager workflow
ParâmetrosTypeStatusDescription
action string required Action: create, add, complete, list, pending, switch
query string required The search query
task_id integer optional Task ID
step_id integer optional Step ID
text string optional Task name or step text
PlanMode workflow
ParâmetrosTypeStatusDescription
action string required Action: enter, exit, status, json, reset
goal string optional Goal/description
plan_file string optional Path to markdown plan file
AskUserQuestion interaction
ParâmetrosTypeStatusDescription
questions_json string required JSON string with questions and options
InvokeSkill workflow
ParâmetrosTypeStatusDescription
skill_name string required The skill name to invoke
arguments string optional Arguments to pass to the skill
BackgroundBash shell
ParâmetrosTypeStatusDescription
command string required The bash command to execute
ReadBgOutput shell
ParâmetrosTypeStatusDescription
task_id integer required The task ID returned by BackgroundBash
KillBgTask shell
ParâmetrosTypeStatusDescription
task_id integer required The task ID to kill
SetCallback workflow
ParâmetrosTypeStatusDescription
action string required Action: set, list, cancel
message string optional Callback message
delay_seconds integer optional Seconds to wait (1-3600)
repeat_count integer optional Times to fire before cancel
callback_id integer optional Callback slot ID

Configuração

MCP is enabled by default. The server advertises tools capability during initialization. Configuration is handled via scorpiox-env.txt. 

# scorpiox-env.txt — MCP-related settings

TOOLS=true                  # Enable MCP tool serving (default: true)
STREAMING=true              # Stream tool results as they arrive
MODEL=sonnet                # AI model for tool-use conversations

# The MCP server binary path is auto-detected:
# Linux:   ~/.scorpiox/scorpiox-code
# macOS:   ~/.scorpiox/scorpiox-code
# Windows: %USERPROFILE%\.scorpiox\scorpiox-code.exe

# Client config (e.g., Claude Desktop mcp_servers.json):
# {"scorpiox": {"command": "~/.scorpiox/scorpiox-code", "args": []}}
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