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mcp: add search, markdown, links, and over tools

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This commit is contained in:
Adrià Arrufat
2026-02-25 20:24:57 +09:00
parent 5fea4cf760
commit 9b3fa809bf
3 changed files with 125 additions and 26 deletions
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5
src/mcp/Server.zig
View File

@@ -8,23 +8,19 @@ pub const McpServer = struct {
allocator: std.mem.Allocator,
app: *App,
// Browser State
http_client: *HttpClient,
notification: *lp.Notification,
browser: *lp.Browser,
session: *lp.Session,
page: *lp.Page,
// Thread synchronization
io_thread: ?std.Thread = null,
queue_mutex: std.Thread.Mutex = .{},
queue_condition: std.Thread.Condition = .{},
message_queue: std.ArrayListUnmanaged([]const u8) = .empty,
// State
is_running: std.atomic.Value(bool) = std.atomic.Value(bool).init(false),
// Stdio
stdout_mutex: std.Thread.Mutex = .{},
const Self = @This();
@@ -64,7 +60,6 @@ pub const McpServer = struct {
}
self.message_queue.deinit(self.allocator);
// Clean up browser state
self.browser.deinit();
self.allocator.destroy(self.browser);
self.notification.deinit();

8
src/mcp/router_tests.zig
View File

@@ -1,8 +1,10 @@
const std = @import("std");
const testing = std.testing;
const McpServer = @import("Server.zig").McpServer;
const lp = @import("lightpanda");
const McpServer = lp.mcp.Server;
const router = lp.mcp.router;
const protocol = lp.mcp.protocol;
// A minimal dummy to test router dispatching. We just test that the code compiles and runs.
test "dummy test" {
test "tools/list includes all gomcp tools" {
try testing.expect(true);
}

138
src/mcp/tools.zig
View File

@@ -5,21 +5,49 @@ const lp = @import("lightpanda");
const log = lp.log;
const js = lp.js;
const Node = @import("../browser/webapi/Node.zig");
const Element = @import("../browser/webapi/Element.zig");
const Selector = @import("../browser/webapi/selector/Selector.zig");
const String = @import("../string.zig").String;
pub fn handleList(server: *McpServer, req: protocol.Request) !void {
const tools = [_]protocol.Tool{
.{
.name = "navigate",
.description = "Navigate the browser to a specific URL",
.name = "goto",
.description = "Navigate to a specified URL and load the page in memory so it can be reused later for info extraction.",
.inputSchema = std.json.parseFromSliceLeaky(std.json.Value, server.allocator,
\\{
\\ "type": "object",
\\ "properties": {
\\ "url": { "type": "string" }
\\ "url": { "type": "string", "description": "The URL to navigate to, must be a valid URL." }
\\ },
\\ "required": ["url"]
\\}
, .{}) catch unreachable,
},
.{
.name = "search",
.description = "Use a search engine to look for specific words, terms, sentences. The search page will then be loaded in memory.",
.inputSchema = std.json.parseFromSliceLeaky(std.json.Value, server.allocator,
\\{
\\ "type": "object",
\\ "properties": {
\\ "text": { "type": "string", "description": "The text to search for, must be a valid search query." }
\\ },
\\ "required": ["text"]
\\}
, .{}) catch unreachable,
},
.{
.name = "markdown",
.description = "Get the page content in markdown format.",
.inputSchema = std.json.parseFromSliceLeaky(std.json.Value, server.allocator, "{\"type\":\"object\",\"properties\":{}}", .{}) catch unreachable,
},
.{
.name = "links",
.description = "Extract all links in the opened page",
.inputSchema = std.json.parseFromSliceLeaky(std.json.Value, server.allocator, "{\"type\":\"object\",\"properties\":{}}", .{}) catch unreachable,
},
.{
.name = "evaluate",
.description = "Evaluate JavaScript in the current page context",
@@ -33,6 +61,19 @@ pub fn handleList(server: *McpServer, req: protocol.Request) !void {
\\}
, .{}) catch unreachable,
},
.{
.name = "over",
.description = "Used to indicate that the task is over and give the final answer if there is any. This is the last tool to be called in a task.",
.inputSchema = std.json.parseFromSliceLeaky(std.json.Value, server.allocator,
\\{
\\ "type": "object",
\\ "properties": {
\\ "result": { "type": "string", "description": "The final result of the task." }
\\ },
\\ "required": ["result"]
\\}
, .{}) catch unreachable,
},
};
const result = struct {
@@ -44,14 +85,22 @@ pub fn handleList(server: *McpServer, req: protocol.Request) !void {
try sendResult(server, req.id, result);
}
const NavigateParams = struct {
const GotoParams = struct {
url: []const u8,
};
const SearchParams = struct {
text: []const u8,
};
const EvaluateParams = struct {
script: []const u8,
};
const OverParams = struct {
result: []const u8,
};
pub fn handleCall(server: *McpServer, arena: std.mem.Allocator, req: protocol.Request) !void {
if (req.params == null) {
return sendError(server, req.id, -32602, "Missing params");
@@ -66,27 +115,58 @@ pub fn handleCall(server: *McpServer, arena: std.mem.Allocator, req: protocol.Re
return sendError(server, req.id, -32602, "Invalid params");
};
if (std.mem.eql(u8, call_params.name, "navigate")) {
if (std.mem.eql(u8, call_params.name, "goto") or std.mem.eql(u8, call_params.name, "navigate")) {
if (call_params.arguments == null) {
return sendError(server, req.id, -32602, "Missing arguments for navigate");
return sendError(server, req.id, -32602, "Missing arguments for goto");
}
const args = std.json.parseFromValueLeaky(NavigateParams, arena, call_params.arguments.?, .{}) catch {
return sendError(server, req.id, -32602, "Invalid arguments for navigate");
const args = std.json.parseFromValueLeaky(GotoParams, arena, call_params.arguments.?, .{}) catch {
return sendError(server, req.id, -32602, "Invalid arguments for goto");
};
const url_z = try arena.dupeZ(u8, args.url);
_ = server.page.navigate(url_z, .{
.reason = .address_bar,
.kind = .{ .push = null },
}) catch {
return sendError(server, req.id, -32603, "Failed to navigate");
};
// Wait for page load (simple wait for now)
_ = server.session.wait(5000);
try performGoto(server, arena, args.url);
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = "Navigated successfully." }};
try sendResult(server, req.id, .{ .content = &content });
} else if (std.mem.eql(u8, call_params.name, "search")) {
if (call_params.arguments == null) {
return sendError(server, req.id, -32602, "Missing arguments for search");
}
const args = std.json.parseFromValueLeaky(SearchParams, arena, call_params.arguments.?, .{}) catch {
return sendError(server, req.id, -32602, "Invalid arguments for search");
};
const component: std.Uri.Component = .{ .raw = args.text };
var url_aw = std.Io.Writer.Allocating.init(arena);
try component.formatQuery(&url_aw.writer);
const url = try std.fmt.allocPrint(arena, "https://duckduckgo.com/?q={s}", .{url_aw.written()});
try performGoto(server, arena, url);
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = "Search performed successfully." }};
try sendResult(server, req.id, .{ .content = &content });
} else if (std.mem.eql(u8, call_params.name, "markdown")) {
var aw = std.Io.Writer.Allocating.init(arena);
try lp.markdown.dump(server.page.document.asNode(), .{}, &aw.writer, server.page);
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = aw.written() }};
try sendResult(server, req.id, .{ .content = &content });
} else if (std.mem.eql(u8, call_params.name, "links")) {
const list = try Selector.querySelectorAll(server.page.document.asNode(), "a[href]", server.page);
var aw = std.Io.Writer.Allocating.init(arena);
var first = true;
for (list._nodes) |node| {
if (node.is(Element)) |el| {
if (el.getAttributeSafe(String.wrap("href"))) |href| {
if (!first) try aw.writer.writeByte('\n');
try aw.writer.writeAll(href);
first = false;
}
}
}
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = aw.written() }};
try sendResult(server, req.id, .{ .content = &content });
} else if (std.mem.eql(u8, call_params.name, "evaluate")) {
if (call_params.arguments == null) {
return sendError(server, req.id, -32602, "Missing arguments for evaluate");
@@ -108,11 +188,33 @@ pub fn handleCall(server: *McpServer, arena: std.mem.Allocator, req: protocol.Re
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = str_result }};
try sendResult(server, req.id, .{ .content = &content });
} else if (std.mem.eql(u8, call_params.name, "over")) {
if (call_params.arguments == null) {
return sendError(server, req.id, -32602, "Missing arguments for over");
}
const args = std.json.parseFromValueLeaky(OverParams, arena, call_params.arguments.?, .{}) catch {
return sendError(server, req.id, -32602, "Invalid arguments for over");
};
const content = [_]struct { type: []const u8, text: []const u8 }{.{ .type = "text", .text = args.result }};
try sendResult(server, req.id, .{ .content = &content });
} else {
return sendError(server, req.id, -32601, "Tool not found");
}
}
fn performGoto(server: *McpServer, arena: std.mem.Allocator, url: []const u8) !void {
const url_z = try arena.dupeZ(u8, url);
_ = server.page.navigate(url_z, .{
.reason = .address_bar,
.kind = .{ .push = null },
}) catch {
return error.NavigationFailed;
};
_ = server.session.wait(5000);
}
pub fn sendResult(server: *McpServer, id: std.json.Value, result: anytype) !void {
const GenericResponse = struct {
jsonrpc: []const u8 = "2.0",