├── .gitignore ├── Makefile ├── README.md ├── client └── client.go ├── go.mod ├── go.sum ├── main.go ├── mcp.go └── weaviate.go /.gitignore: -------------------------------------------------------------------------------- 1 | */mcp-server 2 | */.idea/* 3 | 4 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | build: 2 | go build -o client/mcp-server . 3 | 4 | run-client: 5 | cd client && go run client.go 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Weaviate MCP Server 2 | 3 | ## Instructions 4 | 5 | Build the server: 6 | ``` 7 | make build 8 | ``` 9 | 10 | Run the test client 11 | ``` 12 | make run-client 13 | ``` 14 | 15 | ## Tools 16 | 17 | ### Insert One 18 | Insert an object into weaviate. 19 | 20 | **Request body:** 21 | ```json 22 | {} 23 | ``` 24 | 25 | **Response body** 26 | ```json 27 | {} 28 | ``` 29 | 30 | ### Query 31 | Retrieve objects from weaviate with hybrid search. 32 | 33 | **Request body:** 34 | ```json 35 | {} 36 | ``` 37 | 38 | **Response body** 39 | ```json 40 | {} 41 | ``` 42 | -------------------------------------------------------------------------------- /client/client.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "log" 7 | 8 | "github.com/mark3labs/mcp-go/client" 9 | "github.com/mark3labs/mcp-go/mcp" 10 | ) 11 | 12 | func main() { 13 | ctx := context.Background() 14 | cmd := "./mcp-server" 15 | 16 | c, err := newMCPClient(ctx, cmd) 17 | if err != nil { 18 | log.Fatal(err) 19 | } 20 | defer c.Close() 21 | 22 | { 23 | insertRes, err := insertRequest(ctx, c) 24 | if err != nil { 25 | log.Fatal(err) 26 | } 27 | log.Printf("insert-one response: %+v", insertRes) 28 | } 29 | { 30 | queryRes, err := queryRequest(ctx, c) 31 | if err != nil { 32 | log.Fatal(err) 33 | } 34 | log.Printf("query response: %+v", queryRes) 35 | } 36 | } 37 | 38 | func newMCPClient(ctx context.Context, cmd string) (*client.Client, error) { 39 | c, _ := client.NewStdioMCPClient(cmd, nil) 40 | initRes, err := c.Initialize(ctx, mcp.InitializeRequest{}) 41 | if err != nil { 42 | return nil, fmt.Errorf("failed to init client: %w", err) 43 | } 44 | log.Printf("init result: %+v", initRes) 45 | if err := c.Start(ctx); err != nil { 46 | return nil, fmt.Errorf("failed to start client: %w", err) 47 | } 48 | if err := c.Ping(ctx); err != nil { 49 | return nil, fmt.Errorf("failed to ping server: %w", err) 50 | } 51 | return c, nil 52 | } 53 | 54 | func insertRequest(ctx context.Context, c *client.Client) (*mcp.CallToolResult, error) { 55 | request := mcp.CallToolRequest{} 56 | request.Params.Name = "weaviate-insert-one" 57 | request.Params.Arguments = map[string]interface{}{ 58 | "collection": "WorldMap", 59 | "properties": map[string]interface{}{ 60 | "continent": "Europe", 61 | "country": "Spain", 62 | "city": "Valencia", 63 | }, 64 | } 65 | log.Printf("insert request: %+v", request) 66 | res, err := c.CallTool(ctx, request) 67 | if err != nil { 68 | return nil, fmt.Errorf("failed to call insert-one tool: %v", err) 69 | } 70 | return res, nil 71 | } 72 | 73 | func queryRequest(ctx context.Context, c *client.Client) (*mcp.CallToolResult, error) { 74 | request := mcp.CallToolRequest{} 75 | request.Params.Name = "weaviate-query" 76 | request.Params.Arguments = map[string]interface{}{ 77 | "collection": "WorldMap", 78 | "query": "What country is Valencia in?", 79 | "targetProperties": []string{"continent", "country", "city"}, 80 | } 81 | log.Printf("query request: %+v", request) 82 | res, err := c.CallTool(ctx, request) 83 | if err != nil { 84 | return nil, fmt.Errorf("failed to call query tool: %v", err) 85 | } 86 | return res, nil 87 | } 88 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/weaviate/mcpviate 2 | 3 | go 1.23.1 4 | 5 | require ( 6 | github.com/mark3labs/mcp-go v0.28.0 7 | github.com/weaviate/weaviate-go-client/v4 v4.16.1 8 | golang.org/x/net v0.40.0 9 | ) 10 | 11 | require ( 12 | github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect 13 | github.com/go-openapi/analysis v0.21.2 // indirect 14 | github.com/go-openapi/errors v0.22.0 // indirect 15 | github.com/go-openapi/jsonpointer v0.19.5 // indirect 16 | github.com/go-openapi/jsonreference v0.20.0 // indirect 17 | github.com/go-openapi/loads v0.21.1 // indirect 18 | github.com/go-openapi/spec v0.20.4 // indirect 19 | github.com/go-openapi/strfmt v0.23.0 // indirect 20 | github.com/go-openapi/swag v0.22.3 // indirect 21 | github.com/go-openapi/validate v0.21.0 // indirect 22 | github.com/google/uuid v1.6.0 // indirect 23 | github.com/josharian/intern v1.0.0 // indirect 24 | github.com/mailru/easyjson v0.7.7 // indirect 25 | github.com/mitchellh/mapstructure v1.5.0 // indirect 26 | github.com/oklog/ulid v1.3.1 // indirect 27 | github.com/pkg/errors v0.9.1 // indirect 28 | github.com/spf13/cast v1.7.1 // indirect 29 | github.com/weaviate/weaviate v1.27.0 // indirect 30 | github.com/yosida95/uritemplate/v3 v3.0.2 // indirect 31 | go.mongodb.org/mongo-driver v1.14.0 // indirect 32 | golang.org/x/oauth2 v0.23.0 // indirect 33 | golang.org/x/sys v0.33.0 // indirect 34 | golang.org/x/text v0.25.0 // indirect 35 | google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect 36 | google.golang.org/grpc v1.66.2 // indirect 37 | google.golang.org/protobuf v1.34.2 // indirect 38 | gopkg.in/yaml.v3 v3.0.1 // indirect 39 | ) 40 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 2 | github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= 3 | github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= 4 | github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw= 5 | github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so= 6 | github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw= 7 | github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= 8 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 9 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 10 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 11 | github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8= 12 | github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0= 13 | github.com/go-openapi/analysis v0.21.2 h1:hXFrOYFHUAMQdu6zwAiKKJHJQ8kqZs1ux/ru1P1wLJU= 14 | github.com/go-openapi/analysis v0.21.2/go.mod h1:HZwRk4RRisyG8vx2Oe6aqeSQcoxRp47Xkp3+K6q+LdY= 15 | github.com/go-openapi/errors v0.19.8/go.mod h1:cM//ZKUKyO06HSwqAelJ5NsEMMcpa6VpXe8DOa1Mi1M= 16 | github.com/go-openapi/errors v0.19.9/go.mod h1:cM//ZKUKyO06HSwqAelJ5NsEMMcpa6VpXe8DOa1Mi1M= 17 | github.com/go-openapi/errors v0.22.0 h1:c4xY/OLxUBSTiepAg3j/MHuAv5mJhnf53LLMWFB+u/w= 18 | github.com/go-openapi/errors v0.22.0/go.mod h1:J3DmZScxCDufmIMsdOuDHxJbdOGC0xtUynjIx092vXE= 19 | github.com/go-openapi/jsonpointer v0.19.3/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg= 20 | github.com/go-openapi/jsonpointer v0.19.5 h1:gZr+CIYByUqjcgeLXnQu2gHYQC9o73G2XUeOFYEICuY= 21 | github.com/go-openapi/jsonpointer v0.19.5/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg= 22 | github.com/go-openapi/jsonreference v0.19.6/go.mod h1:diGHMEHg2IqXZGKxqyvWdfWU/aim5Dprw5bqpKkTvns= 23 | github.com/go-openapi/jsonreference v0.20.0 h1:MYlu0sBgChmCfJxxUKZ8g1cPWFOB37YSZqewK7OKeyA= 24 | github.com/go-openapi/jsonreference v0.20.0/go.mod h1:Ag74Ico3lPc+zR+qjn4XBUmXymS4zJbYVCZmcgkasdo= 25 | github.com/go-openapi/loads v0.21.1 h1:Wb3nVZpdEzDTcly8S4HMkey6fjARRzb7iEaySimlDW0= 26 | github.com/go-openapi/loads v0.21.1/go.mod h1:/DtAMXXneXFjbQMGEtbamCZb+4x7eGwkvZCvBmwUG+g= 27 | github.com/go-openapi/spec v0.20.4 h1:O8hJrt0UMnhHcluhIdUgCLRWyM2x7QkBXRvOs7m+O1M= 28 | github.com/go-openapi/spec v0.20.4/go.mod h1:faYFR1CvsJZ0mNsmsphTMSoRrNV3TEDoAM7FOEWeq8I= 29 | github.com/go-openapi/strfmt v0.21.0/go.mod h1:ZRQ409bWMj+SOgXofQAGTIo2Ebu72Gs+WaRADcS5iNg= 30 | github.com/go-openapi/strfmt v0.21.1/go.mod h1:I/XVKeLc5+MM5oPNN7P6urMOpuLXEcNrCX/rPGuWb0k= 31 | github.com/go-openapi/strfmt v0.23.0 h1:nlUS6BCqcnAk0pyhi9Y+kdDVZdZMHfEKQiS4HaMgO/c= 32 | github.com/go-openapi/strfmt v0.23.0/go.mod h1:NrtIpfKtWIygRkKVsxh7XQMDQW5HKQl6S5ik2elW+K4= 33 | github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk= 34 | github.com/go-openapi/swag v0.19.15/go.mod h1:QYRuS/SOXUCsnplDa677K7+DxSOj6IPNl/eQntq43wQ= 35 | github.com/go-openapi/swag v0.21.1/go.mod h1:QYRuS/SOXUCsnplDa677K7+DxSOj6IPNl/eQntq43wQ= 36 | github.com/go-openapi/swag v0.22.3 h1:yMBqmnQ0gyZvEb/+KzuWZOXgllrXT4SADYbvDaXHv/g= 37 | github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14= 38 | github.com/go-openapi/validate v0.21.0 h1:+Wqk39yKOhfpLqNLEC0/eViCkzM5FVXVqrvt526+wcI= 39 | github.com/go-openapi/validate v0.21.0/go.mod h1:rjnrwK57VJ7A8xqfpAOEKRH8yQSGUriMu5/zuPSQ1hg= 40 | github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= 41 | github.com/gobuffalo/attrs v0.0.0-20190224210810-a9411de4debd/go.mod h1:4duuawTqi2wkkpB4ePgWMaai6/Kc6WEz83bhFwpHzj0= 42 | github.com/gobuffalo/depgen v0.0.0-20190329151759-d478694a28d3/go.mod h1:3STtPUQYuzV0gBVOY3vy6CfMm/ljR4pABfrTeHNLHUY= 43 | github.com/gobuffalo/depgen v0.1.0/go.mod h1:+ifsuy7fhi15RWncXQQKjWS9JPkdah5sZvtHc2RXGlg= 44 | github.com/gobuffalo/envy v1.6.15/go.mod h1:n7DRkBerg/aorDM8kbduw5dN3oXGswK5liaSCx4T5NI= 45 | github.com/gobuffalo/envy v1.7.0/go.mod h1:n7DRkBerg/aorDM8kbduw5dN3oXGswK5liaSCx4T5NI= 46 | github.com/gobuffalo/flect v0.1.0/go.mod h1:d2ehjJqGOH/Kjqcoz+F7jHTBbmDb38yXA598Hb50EGs= 47 | github.com/gobuffalo/flect v0.1.1/go.mod h1:8JCgGVbRjJhVgD6399mQr4fx5rRfGKVzFjbj6RE/9UI= 48 | github.com/gobuffalo/flect v0.1.3/go.mod h1:8JCgGVbRjJhVgD6399mQr4fx5rRfGKVzFjbj6RE/9UI= 49 | github.com/gobuffalo/genny v0.0.0-20190329151137-27723ad26ef9/go.mod h1:rWs4Z12d1Zbf19rlsn0nurr75KqhYp52EAGGxTbBhNk= 50 | github.com/gobuffalo/genny v0.0.0-20190403191548-3ca520ef0d9e/go.mod h1:80lIj3kVJWwOrXWWMRzzdhW3DsrdjILVil/SFKBzF28= 51 | github.com/gobuffalo/genny v0.1.0/go.mod h1:XidbUqzak3lHdS//TPu2OgiFB+51Ur5f7CSnXZ/JDvo= 52 | github.com/gobuffalo/genny v0.1.1/go.mod h1:5TExbEyY48pfunL4QSXxlDOmdsD44RRq4mVZ0Ex28Xk= 53 | github.com/gobuffalo/gitgen v0.0.0-20190315122116-cc086187d211/go.mod h1:vEHJk/E9DmhejeLeNt7UVvlSGv3ziL+djtTr3yyzcOw= 54 | github.com/gobuffalo/gogen v0.0.0-20190315121717-8f38393713f5/go.mod h1:V9QVDIxsgKNZs6L2IYiGR8datgMhB577vzTDqypH360= 55 | github.com/gobuffalo/gogen v0.1.0/go.mod h1:8NTelM5qd8RZ15VjQTFkAW6qOMx5wBbW4dSCS3BY8gg= 56 | github.com/gobuffalo/gogen v0.1.1/go.mod h1:y8iBtmHmGc4qa3urIyo1shvOD8JftTtfcKi+71xfDNE= 57 | github.com/gobuffalo/logger v0.0.0-20190315122211-86e12af44bc2/go.mod h1:QdxcLw541hSGtBnhUc4gaNIXRjiDppFGaDqzbrBd3v8= 58 | github.com/gobuffalo/mapi v1.0.1/go.mod h1:4VAGh89y6rVOvm5A8fKFxYG+wIW6LO1FMTG9hnKStFc= 59 | github.com/gobuffalo/mapi v1.0.2/go.mod h1:4VAGh89y6rVOvm5A8fKFxYG+wIW6LO1FMTG9hnKStFc= 60 | github.com/gobuffalo/packd v0.0.0-20190315124812-a385830c7fc0/go.mod h1:M2Juc+hhDXf/PnmBANFCqx4DM3wRbgDvnVWeG2RIxq4= 61 | github.com/gobuffalo/packd v0.1.0/go.mod h1:M2Juc+hhDXf/PnmBANFCqx4DM3wRbgDvnVWeG2RIxq4= 62 | github.com/gobuffalo/packr/v2 v2.0.9/go.mod h1:emmyGweYTm6Kdper+iywB6YK5YzuKchGtJQZ0Odn4pQ= 63 | github.com/gobuffalo/packr/v2 v2.2.0/go.mod h1:CaAwI0GPIAv+5wKLtv8Afwl+Cm78K/I/VCm/3ptBN+0= 64 | github.com/gobuffalo/syncx v0.0.0-20190224160051-33c29581e754/go.mod h1:HhnNqWY95UYwwW3uSASeV7vtgYkT2t16hJgV3AEPUpw= 65 | github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q= 66 | github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= 67 | github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI= 68 | github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= 69 | github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 70 | github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= 71 | github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 72 | github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8= 73 | github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg= 74 | github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY= 75 | github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y= 76 | github.com/karrick/godirwalk v1.8.0/go.mod h1:H5KPZjojv4lE+QYImBI8xVtrBRgYrIVsaRPx4tDPEn4= 77 | github.com/karrick/godirwalk v1.10.3/go.mod h1:RoGL9dQei4vP9ilrpETWE8CLOZ1kiN0LhBygSwrAsHA= 78 | github.com/klauspost/compress v1.13.6/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk= 79 | 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google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 h1:pPJltXNxVzT4pK9yD8vR9X75DaWYYmLGMsEvBfFQZzQ= 189 | google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU= 190 | google.golang.org/grpc v1.66.2 h1:3QdXkuq3Bkh7w+ywLdLvM56cmGvQHUMZpiCzt6Rqaoo= 191 | google.golang.org/grpc v1.66.2/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y= 192 | google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg= 193 | google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw= 194 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 195 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 196 | gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 197 | gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk= 198 | gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q= 199 | gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= 200 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 201 | gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 202 | gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= 203 | gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= 204 | gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 205 | gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 206 | gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 207 | gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 208 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= 209 | gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 210 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | ) 6 | 7 | func main() { 8 | // TODO: get all WeaviateConn config from env 9 | // TODO: support SSEs 10 | // var transport string 11 | // flag.StringVar(&transport, "transport", "stdio", "Specifies the transport protocol. One of [stdio|sse]") 12 | s, err := NewMCPServer() 13 | if err != nil { 14 | log.Fatalf("failed to start mcp server: %v", err) 15 | } 16 | _ = s 17 | s.Serve() 18 | } 19 | -------------------------------------------------------------------------------- /mcp.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | 6 | "github.com/mark3labs/mcp-go/mcp" 7 | "github.com/mark3labs/mcp-go/server" 8 | ) 9 | 10 | type MCPServer struct { 11 | server *server.MCPServer 12 | weaviateConn *WeaviateConnection 13 | defaultCollection string 14 | } 15 | 16 | func NewMCPServer() (*MCPServer, error) { 17 | conn, err := NewWeaviateConnection() 18 | if err != nil { 19 | return nil, err 20 | } 21 | s := &MCPServer{ 22 | server: server.NewMCPServer( 23 | "Weaviate MCP Server", 24 | "0.1.0", 25 | server.WithToolCapabilities(true), 26 | server.WithPromptCapabilities(true), 27 | server.WithResourceCapabilities(true, true), 28 | server.WithRecovery(), 29 | ), 30 | weaviateConn: conn, 31 | // TODO: configurable collection name 32 | defaultCollection: "DefaultCollection", 33 | } 34 | s.registerTools() 35 | return s, nil 36 | } 37 | 38 | func (s *MCPServer) Serve() { 39 | server.ServeStdio(s.server) 40 | } 41 | 42 | func (s *MCPServer) registerTools() { 43 | insertOne := mcp.NewTool( 44 | "weaviate-insert-one", 45 | mcp.WithString( 46 | "collection", 47 | mcp.Description("Name of the target collection"), 48 | ), 49 | mcp.WithObject( 50 | "properties", 51 | mcp.Description("Object properties to insert"), 52 | mcp.Required(), 53 | ), 54 | ) 55 | query := mcp.NewTool( 56 | "weaviate-query", 57 | mcp.WithString( 58 | "query", 59 | mcp.Description("Query data within Weaviate"), 60 | mcp.Required(), 61 | ), 62 | mcp.WithArray( 63 | "targetProperties", 64 | mcp.Description("Properties to return with the query"), 65 | mcp.Required(), 66 | ), 67 | ) 68 | 69 | s.server.AddTools( 70 | server.ServerTool{Tool: insertOne, Handler: s.weaviateInsertOne}, 71 | server.ServerTool{Tool: query, Handler: s.weaviateQuery}, 72 | ) 73 | } 74 | 75 | func (s *MCPServer) weaviateInsertOne(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) { 76 | targetCol := s.parseTargetCollection(req) 77 | props := req.Params.Arguments["properties"].(map[string]interface{}) 78 | 79 | res, err := s.weaviateConn.InsertOne(context.Background(), targetCol, props) 80 | if err != nil { 81 | return mcp.NewToolResultErrorFromErr("failed to insert object", err), nil 82 | } 83 | return mcp.NewToolResultText(res.ID.String()), nil 84 | } 85 | 86 | func (s *MCPServer) weaviateQuery(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) { 87 | targetCol := s.parseTargetCollection(req) 88 | query := req.Params.Arguments["query"].(string) 89 | // TODO: how to enforce `Required` within the sdk so we don't have to validate here 90 | props := req.Params.Arguments["targetProperties"].([]interface{}) 91 | var targetProps []string 92 | { 93 | for _, prop := range props { 94 | typed, ok := prop.(string) 95 | if !ok { 96 | return mcp.NewToolResultError("targetProperties must contain only strings"), nil 97 | } 98 | targetProps = append(targetProps, typed) 99 | } 100 | } 101 | res, err := s.weaviateConn.Query(context.Background(), targetCol, query, targetProps) 102 | if err != nil { 103 | return mcp.NewToolResultErrorFromErr("failed to process query", err), nil 104 | } 105 | return mcp.NewToolResultText(res), nil 106 | } 107 | 108 | func (s *MCPServer) parseTargetCollection(req mcp.CallToolRequest) string { 109 | var ( 110 | targetCol = s.defaultCollection 111 | ) 112 | col, ok := req.Params.Arguments["collection"].(string) 113 | if ok { 114 | targetCol = col 115 | } 116 | return targetCol 117 | } 118 | -------------------------------------------------------------------------------- /weaviate.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | "encoding/json" 6 | "errors" 7 | "fmt" 8 | "time" 9 | 10 | "github.com/weaviate/weaviate-go-client/v4/weaviate" 11 | "github.com/weaviate/weaviate-go-client/v4/weaviate/graphql" 12 | "github.com/weaviate/weaviate/entities/models" 13 | ) 14 | 15 | type WeaviateConnection struct { 16 | client *weaviate.Client 17 | } 18 | 19 | func NewWeaviateConnection() (*WeaviateConnection, error) { 20 | // TODO: get config from env 21 | client, err := weaviate.NewClient(weaviate.Config{ 22 | Host: "localhost:8080", 23 | Scheme: "http", 24 | StartupTimeout: time.Second, 25 | }) 26 | if err != nil { 27 | return nil, fmt.Errorf("connect to weaviate: %w", err) 28 | } 29 | return &WeaviateConnection{client}, nil 30 | } 31 | 32 | func (conn *WeaviateConnection) InsertOne(ctx context.Context, 33 | collection string, props interface{}, 34 | ) (*models.Object, error) { 35 | obj := models.Object{ 36 | Class: collection, 37 | Properties: props, 38 | } 39 | // Use batch to leverage autoschema and gRPC 40 | resp, err := conn.batchInsert(ctx, &obj) 41 | if err != nil { 42 | return nil, fmt.Errorf("insert one object: %w", err) 43 | } 44 | 45 | return &resp[0].Object, err 46 | } 47 | 48 | func (conn *WeaviateConnection) Query(ctx context.Context, collection, 49 | query string, targetProps []string, 50 | ) (string, error) { 51 | hybrid := graphql.HybridArgumentBuilder{} 52 | hybrid.WithQuery(query) 53 | res, err := conn.client.GraphQL().Get(). 54 | WithClassName(collection).WithHybrid(&hybrid). 55 | WithFields(func() []graphql.Field { 56 | fields := make([]graphql.Field, len(targetProps)) 57 | for i, prop := range targetProps { 58 | fields[i] = graphql.Field{Name: prop} 59 | } 60 | return fields 61 | }()...). 62 | Do(context.Background()) 63 | if err != nil { 64 | return "", err 65 | } 66 | b, err := json.Marshal(res) 67 | if err != nil { 68 | return "", fmt.Errorf("unmarshal query response: %w", err) 69 | } 70 | return string(b), nil 71 | } 72 | 73 | func (conn *WeaviateConnection) batchInsert(ctx context.Context, objs ...*models.Object) ([]models.ObjectsGetResponse, error) { 74 | resp, err := conn.client.Batch().ObjectsBatcher().WithObjects(objs...).Do(ctx) 75 | if err != nil { 76 | return nil, fmt.Errorf("make insertion request: %w", err) 77 | } 78 | for _, res := range resp { 79 | if res.Result != nil && res.Result.Errors != nil && res.Result.Errors.Error != nil { 80 | for _, nestedErr := range res.Result.Errors.Error { 81 | err = errors.Join(err, errors.New(nestedErr.Message)) 82 | } 83 | } 84 | } 85 | 86 | return resp, err 87 | } 88 | --------------------------------------------------------------------------------