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use serde_json::{json, Value};
use std::io::{self, BufRead, Write};
fn main() {
let stdin = io::stdin();
let mut stdout = io::stdout();
let reader = stdin.lock();
let mut lines = reader.lines();
while let Some(Ok(line)) = lines.next() {
let request: Value = match serde_json::from_str(&line) {
Ok(r) => r,
Err(_) => continue,
};
let response = match request.get("method").and_then(|m| m.as_str()) {
Some("initialize") => {
json!({
"jsonrpc": "2.0",
"id": request.get("id"),
"result": {
"protocolVersion": "2024-11-05",
"capabilities": {},
"serverInfo": {
"name": "test-server",
"version": "0.2.0"
}
}
})
}
Some("tools/list") => {
json!({
"jsonrpc": "2.0",
"id": request.get("id"),
"result": {
"tools": [
{
"name": "search",
"description": "Search records - UPDATED",
"inputSchema": {
"type": "object",
"properties": {
"q": {
"type": "string",
"description": "Search query"
},
"max_results": {
"type": "integer",
"description": "Max results"
}
},
"required": ["q", "max_results"]
}
},
{
"name": "fetch",
"description": "Fetch a record by ID",
"inputSchema": {
"type": "object",
"properties": {
"id": {
"type": "string",
"description": "Record ID"
}
},
"required": ["id"]
}
}
]
}
})
}
Some("tools/call") => {
let tool_name = request
.get("params")
.and_then(|p| p.get("name"))
.and_then(|n| n.as_str())
.unwrap_or("unknown");
let args = request
.get("params")
.and_then(|p| p.get("arguments"))
.cloned()
.unwrap_or(json!({}));
let result = match tool_name {
"search" => {
let q = args.get("q").and_then(|v| v.as_str()).unwrap_or("unknown");
let limit = args.get("max_results").and_then(|v| v.as_i64()).unwrap_or(10);
json!({
"results": [
{ "id": "1", "title": format!("Result for '{}'", q), "score": 0.95 }
],
"total": 1,
"query": q,
"max_results": limit
})
}
"fetch" => {
let id = args.get("id").and_then(|v| v.as_str()).unwrap_or("unknown");
json!({
"id": id,
"title": format!("Record {}", id),
"content": "Sample content",
"created": "2026-01-01T00:00:00Z"
})
}
_ => {
json!({
"jsonrpc": "2.0",
"id": request.get("id"),
"error": {
"code": -32601,
"message": "Unknown tool"
}
})
}
};
json!({
"jsonrpc": "2.0",
"id": request.get("id"),
"result": {
"content": [
{
"type": "text",
"text": serde_json::to_string(&result).unwrap()
}
],
"isError": false
}
})
}
_ => {
json!({
"jsonrpc": "2.0",
"id": request.get("id"),
"error": {
"code": -32601,
"message": "Method not found"
}
})
}
};
let response_str = serde_json::to_string(&response).unwrap();
writeln!(stdout, "{}", response_str).unwrap();
}
}