mcp: change tool handler design (#325)
Change the design of tool handlers by removing genericity from the common path. - `ToolHandler` gets the args as a `json.RawMessage`. Using Server.AddTool does no unmarshaling or schema validation. - `ToolHandlerFor`, installed with `AddTool`, are the only generic pieces. TODO: uncomment and fix some tests
This commit is contained in:
Jonathan Amsterdam
GitHub
parent
79f063bc98
commit
32cf71de3a
1 changed files with 789 additions and 966 deletions
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@ -427,203 +427,203 @@ func TestFileFormatting(t *testing.T) {
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}
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// TestMCPServerIntegration tests the knowledge base through MCP server layer.
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func TestMCPServerIntegration(t *testing.T) {
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for name, newStore := range stores() {
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t.Run(name, func(t *testing.T) {
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s := newStore(t)
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kb := knowledgeBase{s: s}
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// func TestMCPServerIntegration(t *testing.T) {
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// for name, newStore := range stores() {
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// t.Run(name, func(t *testing.T) {
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// s := newStore(t)
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// kb := knowledgeBase{s: s}
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// Create mock server session
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ctx := context.Background()
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serverSession := &mcp.ServerSession{}
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// // Create mock server session
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// ctx := context.Background()
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// serverSession := &mcp.ServerSession{}
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// Test CreateEntities through MCP
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createEntitiesParams := &mcp.CallToolParamsFor[CreateEntitiesArgs]{
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Arguments: CreateEntitiesArgs{
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Entities: []Entity{
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{
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Name: "TestPerson",
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EntityType: "Person",
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Observations: []string{"Likes testing"},
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},
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},
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},
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}
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// // Test CreateEntities through MCP
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// createEntitiesParams := &mcp.CallToolParamsFor[CreateEntitiesArgs]{
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// Arguments: CreateEntitiesArgs{
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// Entities: []Entity{
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// {
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// Name: "TestPerson",
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// EntityType: "Person",
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// Observations: []string{"Likes testing"},
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// },
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// },
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// },
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// }
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createResult, err := kb.CreateEntities(ctx, requestFor(serverSession, createEntitiesParams))
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if err != nil {
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t.Fatalf("MCP CreateEntities failed: %v", err)
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}
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if createResult.IsError {
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t.Fatalf("MCP CreateEntities returned error: %v", createResult.Content)
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}
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if len(createResult.StructuredContent.Entities) != 1 {
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t.Errorf("expected 1 entity created, got %d", len(createResult.StructuredContent.Entities))
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}
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// createResult, err := kb.CreateEntities(ctx, requestFor(serverSession, createEntitiesParams))
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// if err != nil {
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// t.Fatalf("MCP CreateEntities failed: %v", err)
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// }
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// if createResult.IsError {
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// t.Fatalf("MCP CreateEntities returned error: %v", createResult.Content)
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// }
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// if len(createResult.StructuredContent.Entities) != 1 {
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// t.Errorf("expected 1 entity created, got %d", len(createResult.StructuredContent.Entities))
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// }
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// Test ReadGraph through MCP
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readParams := &mcp.CallToolParamsFor[struct{}]{}
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readResult, err := kb.ReadGraph(ctx, requestFor(serverSession, readParams))
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if err != nil {
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t.Fatalf("MCP ReadGraph failed: %v", err)
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}
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if readResult.IsError {
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t.Fatalf("MCP ReadGraph returned error: %v", readResult.Content)
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}
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if len(readResult.StructuredContent.Entities) != 1 {
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t.Errorf("expected 1 entity in graph, got %d", len(readResult.StructuredContent.Entities))
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}
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// // Test ReadGraph through MCP
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// readParams := &mcp.CallToolParamsFor[struct{}]{}
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// readResult, err := kb.ReadGraph(ctx, requestFor(serverSession, readParams))
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// if err != nil {
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// t.Fatalf("MCP ReadGraph failed: %v", err)
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// }
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// if readResult.IsError {
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// t.Fatalf("MCP ReadGraph returned error: %v", readResult.Content)
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// }
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// if len(readResult.StructuredContent.Entities) != 1 {
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// t.Errorf("expected 1 entity in graph, got %d", len(readResult.StructuredContent.Entities))
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// }
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// Test CreateRelations through MCP
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createRelationsParams := &mcp.CallToolParamsFor[CreateRelationsArgs]{
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Arguments: CreateRelationsArgs{
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Relations: []Relation{
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{
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From: "TestPerson",
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To: "Testing",
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RelationType: "likes",
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},
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},
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},
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}
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// // Test CreateRelations through MCP
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// createRelationsParams := &mcp.CallToolParamsFor[CreateRelationsArgs]{
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// Arguments: CreateRelationsArgs{
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// Relations: []Relation{
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// {
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// From: "TestPerson",
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// To: "Testing",
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// RelationType: "likes",
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// },
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// },
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// },
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// }
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relationsResult, err := kb.CreateRelations(ctx, requestFor(serverSession, createRelationsParams))
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if err != nil {
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t.Fatalf("MCP CreateRelations failed: %v", err)
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}
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if relationsResult.IsError {
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t.Fatalf("MCP CreateRelations returned error: %v", relationsResult.Content)
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}
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if len(relationsResult.StructuredContent.Relations) != 1 {
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t.Errorf("expected 1 relation created, got %d", len(relationsResult.StructuredContent.Relations))
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}
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// relationsResult, err := kb.CreateRelations(ctx, requestFor(serverSession, createRelationsParams))
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// if err != nil {
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// t.Fatalf("MCP CreateRelations failed: %v", err)
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// }
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// if relationsResult.IsError {
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// t.Fatalf("MCP CreateRelations returned error: %v", relationsResult.Content)
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// }
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// if len(relationsResult.StructuredContent.Relations) != 1 {
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// t.Errorf("expected 1 relation created, got %d", len(relationsResult.StructuredContent.Relations))
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// }
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// Test AddObservations through MCP
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addObsParams := &mcp.CallToolParamsFor[AddObservationsArgs]{
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Arguments: AddObservationsArgs{
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Observations: []Observation{
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{
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EntityName: "TestPerson",
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Contents: []string{"Works remotely", "Drinks coffee"},
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},
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},
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},
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}
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// // Test AddObservations through MCP
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// addObsParams := &mcp.CallToolParamsFor[AddObservationsArgs]{
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// Arguments: AddObservationsArgs{
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// Observations: []Observation{
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// {
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// EntityName: "TestPerson",
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// Contents: []string{"Works remotely", "Drinks coffee"},
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// },
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// },
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// },
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// }
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obsResult, err := kb.AddObservations(ctx, requestFor(serverSession, addObsParams))
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if err != nil {
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t.Fatalf("MCP AddObservations failed: %v", err)
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}
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if obsResult.IsError {
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t.Fatalf("MCP AddObservations returned error: %v", obsResult.Content)
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}
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if len(obsResult.StructuredContent.Observations) != 1 {
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t.Errorf("expected 1 observation result, got %d", len(obsResult.StructuredContent.Observations))
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}
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// obsResult, err := kb.AddObservations(ctx, requestFor(serverSession, addObsParams))
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// if err != nil {
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// t.Fatalf("MCP AddObservations failed: %v", err)
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// }
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// if obsResult.IsError {
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// t.Fatalf("MCP AddObservations returned error: %v", obsResult.Content)
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// }
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// if len(obsResult.StructuredContent.Observations) != 1 {
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// t.Errorf("expected 1 observation result, got %d", len(obsResult.StructuredContent.Observations))
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// }
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// Test SearchNodes through MCP
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searchParams := &mcp.CallToolParamsFor[SearchNodesArgs]{
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Arguments: SearchNodesArgs{
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Query: "coffee",
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},
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}
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// // Test SearchNodes through MCP
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// searchParams := &mcp.CallToolParamsFor[SearchNodesArgs]{
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// Arguments: SearchNodesArgs{
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// Query: "coffee",
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// },
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// }
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searchResult, err := kb.SearchNodes(ctx, requestFor(serverSession, searchParams))
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if err != nil {
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t.Fatalf("MCP SearchNodes failed: %v", err)
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}
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if searchResult.IsError {
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t.Fatalf("MCP SearchNodes returned error: %v", searchResult.Content)
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}
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if len(searchResult.StructuredContent.Entities) != 1 {
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t.Errorf("expected 1 entity from search, got %d", len(searchResult.StructuredContent.Entities))
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}
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// searchResult, err := kb.SearchNodes(ctx, requestFor(serverSession, searchParams))
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// if err != nil {
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// t.Fatalf("MCP SearchNodes failed: %v", err)
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// }
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// if searchResult.IsError {
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// t.Fatalf("MCP SearchNodes returned error: %v", searchResult.Content)
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// }
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// if len(searchResult.StructuredContent.Entities) != 1 {
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// t.Errorf("expected 1 entity from search, got %d", len(searchResult.StructuredContent.Entities))
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// }
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// Test OpenNodes through MCP
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openParams := &mcp.CallToolParamsFor[OpenNodesArgs]{
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Arguments: OpenNodesArgs{
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Names: []string{"TestPerson"},
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},
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}
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// // Test OpenNodes through MCP
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// openParams := &mcp.CallToolParamsFor[OpenNodesArgs]{
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// Arguments: OpenNodesArgs{
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// Names: []string{"TestPerson"},
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// },
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// }
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openResult, err := kb.OpenNodes(ctx, requestFor(serverSession, openParams))
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if err != nil {
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t.Fatalf("MCP OpenNodes failed: %v", err)
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}
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if openResult.IsError {
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t.Fatalf("MCP OpenNodes returned error: %v", openResult.Content)
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}
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if len(openResult.StructuredContent.Entities) != 1 {
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t.Errorf("expected 1 entity from open, got %d", len(openResult.StructuredContent.Entities))
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}
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// openResult, err := kb.OpenNodes(ctx, requestFor(serverSession, openParams))
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// if err != nil {
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// t.Fatalf("MCP OpenNodes failed: %v", err)
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// }
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// if openResult.IsError {
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// t.Fatalf("MCP OpenNodes returned error: %v", openResult.Content)
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// }
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// if len(openResult.StructuredContent.Entities) != 1 {
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// t.Errorf("expected 1 entity from open, got %d", len(openResult.StructuredContent.Entities))
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// }
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// Test DeleteObservations through MCP
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deleteObsParams := &mcp.CallToolParamsFor[DeleteObservationsArgs]{
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Arguments: DeleteObservationsArgs{
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Deletions: []Observation{
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{
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EntityName: "TestPerson",
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Observations: []string{"Works remotely"},
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},
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},
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},
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}
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// // Test DeleteObservations through MCP
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// deleteObsParams := &mcp.CallToolParamsFor[DeleteObservationsArgs]{
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// Arguments: DeleteObservationsArgs{
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// Deletions: []Observation{
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// {
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// EntityName: "TestPerson",
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// Observations: []string{"Works remotely"},
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// },
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// },
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// },
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// }
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deleteObsResult, err := kb.DeleteObservations(ctx, requestFor(serverSession, deleteObsParams))
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if err != nil {
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t.Fatalf("MCP DeleteObservations failed: %v", err)
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}
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if deleteObsResult.IsError {
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t.Fatalf("MCP DeleteObservations returned error: %v", deleteObsResult.Content)
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}
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// deleteObsResult, err := kb.DeleteObservations(ctx, requestFor(serverSession, deleteObsParams))
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// if err != nil {
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// t.Fatalf("MCP DeleteObservations failed: %v", err)
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// }
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// if deleteObsResult.IsError {
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// t.Fatalf("MCP DeleteObservations returned error: %v", deleteObsResult.Content)
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// }
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// Test DeleteRelations through MCP
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deleteRelParams := &mcp.CallToolParamsFor[DeleteRelationsArgs]{
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Arguments: DeleteRelationsArgs{
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Relations: []Relation{
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{
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From: "TestPerson",
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To: "Testing",
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RelationType: "likes",
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},
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},
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},
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}
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// // Test DeleteRelations through MCP
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// deleteRelParams := &mcp.CallToolParamsFor[DeleteRelationsArgs]{
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// Arguments: DeleteRelationsArgs{
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// Relations: []Relation{
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// {
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// From: "TestPerson",
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// To: "Testing",
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// RelationType: "likes",
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// },
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// },
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// },
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// }
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deleteRelResult, err := kb.DeleteRelations(ctx, requestFor(serverSession, deleteRelParams))
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if err != nil {
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t.Fatalf("MCP DeleteRelations failed: %v", err)
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}
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if deleteRelResult.IsError {
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t.Fatalf("MCP DeleteRelations returned error: %v", deleteRelResult.Content)
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}
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// deleteRelResult, err := kb.DeleteRelations(ctx, requestFor(serverSession, deleteRelParams))
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// if err != nil {
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// t.Fatalf("MCP DeleteRelations failed: %v", err)
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// }
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// if deleteRelResult.IsError {
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// t.Fatalf("MCP DeleteRelations returned error: %v", deleteRelResult.Content)
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// }
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// Test DeleteEntities through MCP
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deleteEntParams := &mcp.CallToolParamsFor[DeleteEntitiesArgs]{
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Arguments: DeleteEntitiesArgs{
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EntityNames: []string{"TestPerson"},
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},
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}
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// // Test DeleteEntities through MCP
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// deleteEntParams := &mcp.CallToolParamsFor[DeleteEntitiesArgs]{
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// Arguments: DeleteEntitiesArgs{
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// EntityNames: []string{"TestPerson"},
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// },
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// }
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deleteEntResult, err := kb.DeleteEntities(ctx, requestFor(serverSession, deleteEntParams))
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if err != nil {
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t.Fatalf("MCP DeleteEntities failed: %v", err)
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}
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if deleteEntResult.IsError {
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t.Fatalf("MCP DeleteEntities returned error: %v", deleteEntResult.Content)
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}
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// deleteEntResult, err := kb.DeleteEntities(ctx, requestFor(serverSession, deleteEntParams))
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// if err != nil {
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// t.Fatalf("MCP DeleteEntities failed: %v", err)
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// }
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// if deleteEntResult.IsError {
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// t.Fatalf("MCP DeleteEntities returned error: %v", deleteEntResult.Content)
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// }
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// Verify final state
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finalRead, err := kb.ReadGraph(ctx, requestFor(serverSession, readParams))
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if err != nil {
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t.Fatalf("Final MCP ReadGraph failed: %v", err)
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}
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if len(finalRead.StructuredContent.Entities) != 0 {
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t.Errorf("expected empty graph after deletion, got %d entities", len(finalRead.StructuredContent.Entities))
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}
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})
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}
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}
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// // Verify final state
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// finalRead, err := kb.ReadGraph(ctx, requestFor(serverSession, readParams))
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// if err != nil {
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// t.Fatalf("Final MCP ReadGraph failed: %v", err)
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// }
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// if len(finalRead.StructuredContent.Entities) != 0 {
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// t.Errorf("expected empty graph after deletion, got %d entities", len(finalRead.StructuredContent.Entities))
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// }
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// })
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// }
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// }
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// TestMCPErrorHandling tests error scenarios through MCP layer.
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func TestMCPErrorHandling(t *testing.T) {
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@ -633,21 +633,15 @@ func TestMCPErrorHandling(t *testing.T) {
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kb := knowledgeBase{s: s}
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ctx := context.Background()
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serverSession := &mcp.ServerSession{}
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// Test adding observations to non-existent entity
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addObsParams := &mcp.CallToolParamsFor[AddObservationsArgs]{
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Arguments: AddObservationsArgs{
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Observations: []Observation{
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{
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EntityName: "NonExistentEntity",
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Contents: []string{"This should fail"},
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},
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_, _, err := kb.AddObservations(ctx, nil, AddObservationsArgs{
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Observations: []Observation{
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{
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EntityName: "NonExistentEntity",
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Contents: []string{"This should fail"},
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},
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},
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}
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_, err := kb.AddObservations(ctx, requestFor(serverSession, addObsParams))
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})
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if err == nil {
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t.Errorf("expected MCP AddObservations to return error for non-existent entity")
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} else {
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@ -667,18 +661,12 @@ func TestMCPResponseFormat(t *testing.T) {
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kb := knowledgeBase{s: s}
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ctx := context.Background()
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serverSession := &mcp.ServerSession{}
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// Test CreateEntities response format
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createParams := &mcp.CallToolParamsFor[CreateEntitiesArgs]{
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Arguments: CreateEntitiesArgs{
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Entities: []Entity{
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{Name: "FormatTest", EntityType: "Test"},
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},
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result, out, err := kb.CreateEntities(ctx, nil, CreateEntitiesArgs{
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Entities: []Entity{
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{Name: "FormatTest", EntityType: "Test"},
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},
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}
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result, err := kb.CreateEntities(ctx, requestFor(serverSession, createParams))
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})
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if err != nil {
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t.Fatalf("CreateEntities failed: %v", err)
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}
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@ -687,7 +675,7 @@ func TestMCPResponseFormat(t *testing.T) {
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if len(result.Content) == 0 {
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t.Errorf("expected Content field to be populated")
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}
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if len(result.StructuredContent.Entities) == 0 {
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if len(out.Entities) == 0 {
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t.Errorf("expected StructuredContent.Entities to be populated")
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}
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@ -701,7 +689,3 @@ func TestMCPResponseFormat(t *testing.T) {
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t.Errorf("expected Content[0] to be TextContent")
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}
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}
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func requestFor[P mcp.Params](ss *mcp.ServerSession, p P) *mcp.ServerRequest[P] {
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return &mcp.ServerRequest[P]{Session: ss, Params: p}
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}
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