Skip to content

Test MCP version gates and continuation receive policies #3037

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
jviotti merged 4 commits into from
Oct 28, 2026
Merged

Test MCP version gates and continuation receive policies #3037

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
59d6bf6
Test MCP version gates and continuation receive policies
HarshPopat23 Oct 28, 2026
3e9a7fa
Keep MCP tests direct and in existing test files
HarshPopat23 Oct 28, 2026
f4cea9a
Format new MCP test JSON fixtures across multiple lines
HarshPopat23 Oct 28, 2026
85d18a8
Merge main and preserve both MCP header test additions
HarshPopat23 Oct 28, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
195 changes: 195 additions & 0 deletions test/mcp/mcp_headers_test.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4669,3 +4669,198 @@ TEST(parameter_headers_index_rejects_duplicate_descriptor_names) {
sourcemeta::core::JSON{0}, parameters, arguments, headers),
"Parameter header names must be case-insensitively unique");
}

TEST(request_parameters_metadata_version_2025_03_26) {
const auto input{sourcemeta::core::parse_json(R"JSON({
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2025-03-26",
"io.modelcontextprotocol/clientCapabilities": {}
},
"requestState": "state"
})JSON")};
EXPECT_EQ(sourcemeta::core::mcp_validate_request_parameters(input).first,
sourcemeta::core::MCPRequestMetaStatus::UnsupportedProtocolVersion);
}

TEST(request_parameters_metadata_version_2025_06_18) {
const auto input{sourcemeta::core::parse_json(R"JSON({
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2025-06-18",
"io.modelcontextprotocol/clientCapabilities": {}
},
"requestState": "state"
})JSON")};
EXPECT_EQ(sourcemeta::core::mcp_validate_request_parameters(input).first,
sourcemeta::core::MCPRequestMetaStatus::UnsupportedProtocolVersion);
}

TEST(request_parameters_metadata_version_2025_11_25) {
const auto input{sourcemeta::core::parse_json(R"JSON({
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2025-11-25",
"io.modelcontextprotocol/clientCapabilities": {}
},
"requestState": "state"
})JSON")};
EXPECT_EQ(sourcemeta::core::mcp_validate_request_parameters(input).first,
sourcemeta::core::MCPRequestMetaStatus::UnsupportedProtocolVersion);
}

TEST(request_parameters_metadata_version_2026_07_28) {
const auto input{sourcemeta::core::parse_json(R"JSON({
"_meta": {
"io.modelcontextprotocol/protocolVersion": "2026-07-28",
"io.modelcontextprotocol/clientCapabilities": {}
},
"requestState": "state"
})JSON")};
EXPECT_EQ(sourcemeta::core::mcp_validate_request_parameters(input).first,
sourcemeta::core::MCPRequestMetaStatus::Valid);
}

TEST(parameter_headers_reject_version_2025_03_26) {
const auto arguments{sourcemeta::core::JSON::make_object()};
EXPECT_MCP_REJECTS(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2025_03_26,
sourcemeta::core::JSON{1}, {}, arguments, {}),
"Parameter headers require MCP 2026-07-28");
}

TEST(parameter_headers_reject_version_2025_06_18) {
const auto arguments{sourcemeta::core::JSON::make_object()};
EXPECT_MCP_REJECTS(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2025_06_18,
sourcemeta::core::JSON{1}, {}, arguments, {}),
"Parameter headers require MCP 2026-07-28");
}

TEST(parameter_headers_reject_version_2025_11_25) {
const auto arguments{sourcemeta::core::JSON::make_object()};
EXPECT_MCP_REJECTS(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2025_11_25,
sourcemeta::core::JSON{1}, {}, arguments, {}),
"Parameter headers require MCP 2026-07-28");
}

TEST(parameter_header_round_trip_printable_ascii) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto arguments{sourcemeta::core::parse_json(R"JSON({
"value": " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, arguments)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{"mCp-pArAm-VaLuE", owned.front().second}}};
EXPECT_FALSE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, arguments, views)
.has_value());
}

TEST(parameter_header_round_trip_accent) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto arguments{sourcemeta::core::parse_json(R"JSON({
"value": "café"
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, arguments)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{"mCp-pArAm-VaLuE", owned.front().second}}};
EXPECT_FALSE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, arguments, views)
.has_value());
}

TEST(parameter_header_round_trip_japanese) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto arguments{sourcemeta::core::parse_json(R"JSON({
"value": "日本語"
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, arguments)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{"mCp-pArAm-VaLuE", owned.front().second}}};
EXPECT_FALSE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, arguments, views)
.has_value());
}

TEST(parameter_header_round_trip_emoji) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto arguments{sourcemeta::core::parse_json(R"JSON({
"value": "🙂"
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, arguments)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{"mCp-pArAm-VaLuE", owned.front().second}}};
EXPECT_FALSE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, arguments, views)
.has_value());
}

TEST(parameter_header_round_trip_padded_unicode) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto arguments{sourcemeta::core::parse_json(R"JSON({
"value": " café "
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, arguments)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{"mCp-pArAm-VaLuE", owned.front().second}}};
EXPECT_FALSE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, arguments, views)
.has_value());
}

TEST(parameter_header_round_trip_rejects_changed_body) {
const std::array<sourcemeta::core::MCPHeaderParameter, 1> descriptors{
{{.name = "value",
.path = {"value"},
.type = sourcemeta::core::JSON::Type::String}}};
const auto original{sourcemeta::core::parse_json(R"JSON({
"value": "original"
})JSON")};
const auto owned{
sourcemeta::core::mcp_make_parameter_headers(descriptors, original)};
const std::array<std::pair<sourcemeta::core::JSON::StringView,
sourcemeta::core::JSON::StringView>,
1>
views{{{owned.front().first, owned.front().second}}};
const auto changed{sourcemeta::core::parse_json(R"JSON({
"value": "changed"
})JSON")};
EXPECT_TRUE(sourcemeta::core::mcp_validate_parameter_headers(
sourcemeta::core::MCPProtocolVersion::V_2026_07_28,
sourcemeta::core::JSON{1}, descriptors, changed, views)
.has_value());
}
Loading
Loading