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mcp: ignore unknown json fields and improve error reporting

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This commit is contained in:
Adrià Arrufat
2026-02-28 22:18:37 +09:00
parent 6897d72c3e
commit 5f9a7a5381
3 changed files with 12 additions and 10 deletions
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17
src/mcp/tools.zig
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@@ -126,15 +126,18 @@ pub fn handleCall(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
arguments: ?std.json.Value = null,
};
const call_params = std.json.parseFromValueLeaky(CallParams, arena, req.params.?, .{}) catch {
return sendError(server, req.id.?, -32602, "Invalid params");
const call_params = std.json.parseFromValueLeaky(CallParams, arena, req.params.?, .{ .ignore_unknown_fields = true }) catch {
var aw: std.Io.Writer.Allocating = .init(arena);
std.json.Stringify.value(req.params.?, .{}, &aw.writer) catch {};
const msg = std.fmt.allocPrint(arena, "Invalid params: {s}", .{aw.written()}) catch "Invalid params";
return sendError(server, req.id.?, -32602, msg);
};
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 goto");
}
const args = std.json.parseFromValueLeaky(GotoParams, arena, call_params.arguments.?, .{}) catch {
const args = std.json.parseFromValueLeaky(GotoParams, arena, call_params.arguments.?, .{ .ignore_unknown_fields = true }) catch {
return sendError(server, req.id.?, -32602, "Invalid arguments for goto");
};
@@ -148,7 +151,7 @@ pub fn handleCall(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
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 {
const args = std.json.parseFromValueLeaky(SearchParams, arena, call_params.arguments.?, .{ .ignore_unknown_fields = true }) catch {
return sendError(server, req.id.?, -32602, "Invalid arguments for search");
};
@@ -172,7 +175,7 @@ pub fn handleCall(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
url: ?[]const u8 = null,
};
if (call_params.arguments) |args_raw| {
if (std.json.parseFromValueLeaky(MarkdownParams, arena, args_raw, .{})) |args| {
if (std.json.parseFromValueLeaky(MarkdownParams, arena, args_raw, .{ .ignore_unknown_fields = true })) |args| {
if (args.url) |u| {
performGoto(server, arena, u) catch {
return sendError(server, req.id.?, -32603, "Internal error during navigation");
@@ -192,7 +195,7 @@ pub fn handleCall(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
url: ?[]const u8 = null,
};
if (call_params.arguments) |args_raw| {
if (std.json.parseFromValueLeaky(LinksParams, arena, args_raw, .{})) |args| {
if (std.json.parseFromValueLeaky(LinksParams, arena, args_raw, .{ .ignore_unknown_fields = true })) |args| {
if (args.url) |u| {
performGoto(server, arena, u) catch {
return sendError(server, req.id.?, -32603, "Internal error during navigation");
@@ -228,7 +231,7 @@ pub fn handleCall(server: *Server, arena: std.mem.Allocator, req: protocol.Reque
url: ?[]const u8 = null,
};
const args = std.json.parseFromValueLeaky(EvaluateParamsEx, arena, call_params.arguments.?, .{}) catch {
const args = std.json.parseFromValueLeaky(EvaluateParamsEx, arena, call_params.arguments.?, .{ .ignore_unknown_fields = true }) catch {
return sendError(server, req.id.?, -32602, "Invalid arguments for evaluate");
};