use crate::llm::actions::{
client_trait::{Client, ClientActionResult},
protocol_trait::Protocol,
ActionDefinition, Parameter, ParameterDefinition,
};
use crate::protocol::EventType;
use crate::state::app_state::AppState;
use anyhow::{Context, Result};
use serde_json::json;
use std::sync::LazyLock;
pub static MCP_CLIENT_CONNECTED_EVENT: LazyLock<EventType> = LazyLock::new(|| {
EventType::new(
"mcp_client_connected",
"MCP client completed initialization handshake with server",
json!({"type": "list_resources"}),
)
.with_parameters(vec![
Parameter {
name: "server_name".to_string(),
type_hint: "string".to_string(),
description: "Name of the MCP server".to_string(),
required: true,
},
Parameter {
name: "server_version".to_string(),
type_hint: "string".to_string(),
description: "Version of the MCP server".to_string(),
required: true,
},
Parameter {
name: "capabilities".to_string(),
type_hint: "object".to_string(),
description: "Server capabilities (resources, tools, prompts)".to_string(),
required: true,
},
])
});
pub static MCP_CLIENT_RESPONSE_RECEIVED_EVENT: LazyLock<EventType> = LazyLock::new(|| {
EventType::new(
"mcp_response_received",
"MCP client received response from server",
json!({"type": "call_tool", "name": "search", "arguments": {"query": "test"}}),
)
.with_parameters(vec![
Parameter {
name: "method".to_string(),
type_hint: "string".to_string(),
description: "JSON-RPC method that was called".to_string(),
required: true,
},
Parameter {
name: "result".to_string(),
type_hint: "object".to_string(),
description: "Response result data".to_string(),
required: true,
},
])
});
pub struct McpClientProtocol;
impl Default for McpClientProtocol {
fn default() -> Self {
Self::new()
}
}
impl McpClientProtocol {
pub fn new() -> Self {
Self
}
}
impl Protocol for McpClientProtocol {
fn get_startup_parameters(&self) -> Vec<ParameterDefinition> {
vec![
ParameterDefinition {
name: "client_name".to_string(),
description: "Name to identify this MCP client".to_string(),
type_hint: "string".to_string(),
required: false,
example: json!("netget-client"),
default: None,
},
ParameterDefinition {
name: "client_version".to_string(),
description: "Version of this MCP client".to_string(),
type_hint: "string".to_string(),
required: false,
example: json!("1.0.0"),
default: None,
},
]
}
fn get_async_actions(&self, _state: &AppState) -> Vec<ActionDefinition> {
vec![
ActionDefinition {
name: "list_resources".to_string(),
description: "List available resources from MCP server".to_string(),
parameters: vec![],
example: json!({
"type": "list_resources"
}),
log_template: None,
},
ActionDefinition {
name: "read_resource".to_string(),
description: "Read a resource from MCP server".to_string(),
parameters: vec![Parameter {
name: "uri".to_string(),
type_hint: "string".to_string(),
description: "Resource URI (e.g., file:///README.md)".to_string(),
required: true,
}],
example: json!({
"type": "read_resource",
"uri": "file:///README.md"
}),
log_template: None,
},
ActionDefinition {
name: "list_tools".to_string(),
description: "List available tools from MCP server".to_string(),
parameters: vec![],
example: json!({
"type": "list_tools"
}),
log_template: None,
},
ActionDefinition {
name: "call_tool".to_string(),
description: "Call a tool on the MCP server".to_string(),
parameters: vec![
Parameter {
name: "name".to_string(),
type_hint: "string".to_string(),
description: "Tool name".to_string(),
required: true,
},
Parameter {
name: "arguments".to_string(),
type_hint: "object".to_string(),
description: "Tool arguments".to_string(),
required: false,
},
],
example: json!({
"type": "call_tool",
"name": "calculate",
"arguments": {
"expression": "2+2"
}
}),
log_template: None,
},
ActionDefinition {
name: "list_prompts".to_string(),
description: "List available prompts from MCP server".to_string(),
parameters: vec![],
example: json!({
"type": "list_prompts"
}),
log_template: None,
},
ActionDefinition {
name: "get_prompt".to_string(),
description: "Get a prompt from MCP server".to_string(),
parameters: vec![
Parameter {
name: "name".to_string(),
type_hint: "string".to_string(),
description: "Prompt name".to_string(),
required: true,
},
Parameter {
name: "arguments".to_string(),
type_hint: "object".to_string(),
description: "Prompt arguments".to_string(),
required: false,
},
],
example: json!({
"type": "get_prompt",
"name": "code-review",
"arguments": {}
}),
log_template: None,
},
ActionDefinition {
name: "disconnect".to_string(),
description: "Disconnect from the MCP server".to_string(),
parameters: vec![],
example: json!({
"type": "disconnect"
}),
log_template: None,
},
]
}
fn get_sync_actions(&self) -> Vec<ActionDefinition> {
vec![
ActionDefinition {
name: "list_resources".to_string(),
description: "List resources in response to server event".to_string(),
parameters: vec![],
example: json!({
"type": "list_resources"
}),
log_template: None,
},
ActionDefinition {
name: "call_tool".to_string(),
description: "Call a tool in response to server event".to_string(),
parameters: vec![
Parameter {
name: "name".to_string(),
type_hint: "string".to_string(),
description: "Tool name".to_string(),
required: true,
},
Parameter {
name: "arguments".to_string(),
type_hint: "object".to_string(),
description: "Tool arguments".to_string(),
required: false,
},
],
example: json!({
"type": "call_tool",
"name": "search",
"arguments": {
"query": "test"
}
}),
log_template: None,
},
]
}
fn protocol_name(&self) -> &'static str {
"MCP"
}
fn get_event_types(&self) -> Vec<EventType> {
vec![
EventType::new(
"mcp_client_connected",
"Triggered when MCP client completes initialization",
json!({"type": "list_resources"}),
),
EventType::new(
"mcp_response_received",
"Triggered when MCP client receives a response",
json!({"type": "call_tool", "name": "search", "arguments": {"query": "test"}}),
),
]
}
fn stack_name(&self) -> &'static str {
"ETH>IP>TCP>HTTP>MCP"
}
fn keywords(&self) -> Vec<&'static str> {
vec![
"mcp",
"mcp client",
"connect to mcp",
"model context protocol",
]
}
fn metadata(&self) -> crate::protocol::metadata::ProtocolMetadataV2 {
use crate::protocol::metadata::{DevelopmentState, ProtocolMetadataV2};
ProtocolMetadataV2::builder()
.state(DevelopmentState::Experimental)
.implementation("Custom JSON-RPC 2.0 client over HTTP")
.llm_control("Full control over MCP operations (tools, resources, prompts)")
.e2e_testing("Local MCP server or public MCP endpoint")
.build()
}
fn description(&self) -> &'static str {
"MCP (Model Context Protocol) client for accessing LLM context servers"
}
fn example_prompt(&self) -> &'static str {
"Connect to http://localhost:8000 via MCP and list available tools"
}
fn group_name(&self) -> &'static str {
"RPC & API"
}
fn get_startup_examples(&self) -> crate::llm::actions::StartupExamples {
use crate::llm::actions::StartupExamples;
use serde_json::json;
StartupExamples::new(
json!({
"type": "open_client",
"remote_addr": "http://localhost:8000",
"base_stack": "mcp",
"instruction": "List available tools and call the calculate tool with expression 2+2"
}),
json!({
"type": "open_client",
"remote_addr": "http://localhost:8000",
"base_stack": "mcp",
"event_handlers": [{
"event_pattern": "mcp_response_received",
"handler": {
"type": "script",
"language": "python",
"code": "<mcp_client_handler>"
}
}]
}),
json!({
"type": "open_client",
"remote_addr": "http://localhost:8000",
"base_stack": "mcp",
"event_handlers": [
{
"event_pattern": "mcp_client_connected",
"handler": {
"type": "static",
"actions": [{
"type": "list_tools"
}]
}
},
{
"event_pattern": "mcp_response_received",
"handler": {
"type": "static",
"actions": [{
"type": "disconnect"
}]
}
}
]
}),
)
}
}
impl Client for McpClientProtocol {
fn connect(
&self,
ctx: crate::protocol::ConnectContext,
) -> std::pin::Pin<
Box<dyn std::future::Future<Output = anyhow::Result<std::net::SocketAddr>> + Send>,
> {
Box::pin(async move {
use crate::client::mcp::McpClient;
McpClient::connect_with_llm_actions(
ctx.remote_addr,
ctx.llm_client,
ctx.state,
ctx.status_tx,
ctx.client_id,
ctx.startup_params,
)
.await
})
}
fn execute_action(&self, action: serde_json::Value) -> Result<ClientActionResult> {
let action_type = action
.get("type")
.and_then(|v| v.as_str())
.context("Missing 'type' field in action")?;
match action_type {
"list_resources" => Ok(ClientActionResult::Custom {
name: "mcp_list_resources".to_string(),
data: json!({}),
}),
"read_resource" => {
let uri = action
.get("uri")
.and_then(|v| v.as_str())
.context("Missing 'uri' field")?
.to_string();
Ok(ClientActionResult::Custom {
name: "mcp_read_resource".to_string(),
data: json!({
"uri": uri
}),
})
}
"list_tools" => Ok(ClientActionResult::Custom {
name: "mcp_list_tools".to_string(),
data: json!({}),
}),
"call_tool" => {
let name = action
.get("name")
.and_then(|v| v.as_str())
.context("Missing 'name' field")?
.to_string();
let arguments = action.get("arguments").and_then(|v| v.as_object()).cloned();
Ok(ClientActionResult::Custom {
name: "mcp_call_tool".to_string(),
data: json!({
"name": name,
"arguments": arguments
}),
})
}
"list_prompts" => Ok(ClientActionResult::Custom {
name: "mcp_list_prompts".to_string(),
data: json!({}),
}),
"get_prompt" => {
let name = action
.get("name")
.and_then(|v| v.as_str())
.context("Missing 'name' field")?
.to_string();
let arguments = action.get("arguments").and_then(|v| v.as_object()).cloned();
Ok(ClientActionResult::Custom {
name: "mcp_get_prompt".to_string(),
data: json!({
"name": name,
"arguments": arguments
}),
})
}
"disconnect" => Ok(ClientActionResult::Disconnect),
_ => Err(anyhow::anyhow!(
"Unknown MCP client action: {}",
action_type
)),
}
}
}