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mcp: use dynamic allocation for error messages in tools

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Adrià Arrufat
2026-03-01 21:36:21 +09:00
parent 8cbc58d257
commit 254984b600
1 changed files with 2 additions and 4 deletions
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6
src/mcp/tools.zig
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@@ -210,14 +210,12 @@ fn handleOver(server: *Server, arena: std.mem.Allocator, id: std.json.Value, arg
fn parseParams(comptime T: type, arena: std.mem.Allocator, arguments: ?std.json.Value, server: *Server, id: std.json.Value, tool_name: []const u8) !T { fn parseParams(comptime T: type, arena: std.mem.Allocator, arguments: ?std.json.Value, server: *Server, id: std.json.Value, tool_name: []const u8) !T {
if (arguments == null) { if (arguments == null) {
var buf: [64]u8 = undefined; const msg = std.fmt.allocPrint(arena, "Missing arguments for {s}", .{tool_name}) catch "Missing arguments";
const msg = std.fmt.bufPrint(&buf, "Missing arguments for {s}", .{tool_name}) catch "Missing arguments";
try server.sendError(id, .InvalidParams, msg); try server.sendError(id, .InvalidParams, msg);
return error.InvalidParams; return error.InvalidParams;
} }
return std.json.parseFromValueLeaky(T, arena, arguments.?, .{ .ignore_unknown_fields = true }) catch { return std.json.parseFromValueLeaky(T, arena, arguments.?, .{ .ignore_unknown_fields = true }) catch {
var buf: [64]u8 = undefined; const msg = std.fmt.allocPrint(arena, "Invalid arguments for {s}", .{tool_name}) catch "Invalid arguments";
const msg = std.fmt.bufPrint(&buf, "Invalid arguments for {s}", .{tool_name}) catch "Invalid arguments";
try server.sendError(id, .InvalidParams, msg); try server.sendError(id, .InvalidParams, msg);
return error.InvalidParams; return error.InvalidParams;
}; };