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package github
import (
"context"
"encoding/json"
"fmt"
"strings"
ghErrors "github.com/github/github-mcp-server/pkg/errors"
"github.com/github/github-mcp-server/pkg/inventory"
"github.com/github/github-mcp-server/pkg/scopes"
"github.com/github/github-mcp-server/pkg/translations"
"github.com/github/github-mcp-server/pkg/utils"
"github.com/google/jsonschema-go/jsonschema"
"github.com/modelcontextprotocol/go-sdk/mcp"
"github.com/shurcooL/githubv4"
)
// GetLabel retrieves a specific label by name from a GitHub repository
func GetLabel(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetMetadataIssues,
mcp.Tool{
Name: "get_label",
Description: t("TOOL_GET_LABEL_DESCRIPTION", "Get a specific label from a repository."),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_GET_LABEL_TITLE", "Get a specific label from a repository."),
ReadOnlyHint: true,
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner (username or organization name)",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"name": {
Type: "string",
Description: "Label name.",
},
},
Required: []string{"owner", "repo", "name"},
},
},
[]scopes.Scope{scopes.Repo},
func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
owner, err := RequiredParam[string](args, "owner")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
repo, err := RequiredParam[string](args, "repo")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
name, err := RequiredParam[string](args, "name")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
var query struct {
Repository struct {
Label struct {
ID githubv4.ID
Name githubv4.String
Color githubv4.String
Description githubv4.String
} `graphql:"label(name: $name)"`
} `graphql:"repository(owner: $owner, name: $repo)"`
}
vars := map[string]any{
"owner": githubv4.String(owner),
"repo": githubv4.String(repo),
"name": githubv4.String(name),
}
client, err := deps.GetGQLClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
if err := client.Query(ctx, &query, vars); err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to find label", err), nil, nil
}
if query.Repository.Label.Name == "" {
return utils.NewToolResultError(fmt.Sprintf("label '%s' not found in %s/%s", name, owner, repo)), nil, nil
}
label := map[string]any{
"id": fmt.Sprintf("%v", query.Repository.Label.ID),
"name": string(query.Repository.Label.Name),
"color": string(query.Repository.Label.Color),
"description": string(query.Repository.Label.Description),
}
out, err := json.Marshal(label)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal label: %w", err)
}
return utils.NewToolResultText(string(out)), nil, nil
},
)
}
// GetLabelForLabelsToolset returns the same GetLabel tool but registered in the labels toolset.
// This provides conformance with the original behavior where get_label was in both toolsets.
func GetLabelForLabelsToolset(t translations.TranslationHelperFunc) inventory.ServerTool {
tool := GetLabel(t)
tool.Toolset = ToolsetLabels
return tool
}
// ListLabels lists labels from a repository
func ListLabels(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetLabels,
mcp.Tool{
Name: "list_label",
Description: t("TOOL_LIST_LABEL_DESCRIPTION", "List labels from a repository"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_LIST_LABEL_DESCRIPTION", "List labels from a repository."),
ReadOnlyHint: true,
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner (username or organization name) - required for all operations",
},
"repo": {
Type: "string",
Description: "Repository name - required for all operations",
},
},
Required: []string{"owner", "repo"},
},
},
[]scopes.Scope{scopes.Repo},
func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
owner, err := RequiredParam[string](args, "owner")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
repo, err := RequiredParam[string](args, "repo")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
client, err := deps.GetGQLClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
var query struct {
Repository struct {
Labels struct {
Nodes []struct {
ID githubv4.ID
Name githubv4.String
Color githubv4.String
Description githubv4.String
}
TotalCount githubv4.Int
} `graphql:"labels(first: 100)"`
} `graphql:"repository(owner: $owner, name: $repo)"`
}
vars := map[string]any{
"owner": githubv4.String(owner),
"repo": githubv4.String(repo),
}
if err := client.Query(ctx, &query, vars); err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to list labels", err), nil, nil
}
labels := make([]map[string]any, len(query.Repository.Labels.Nodes))
for i, labelNode := range query.Repository.Labels.Nodes {
labels[i] = map[string]any{
"id": fmt.Sprintf("%v", labelNode.ID),
"name": string(labelNode.Name),
"color": string(labelNode.Color),
"description": string(labelNode.Description),
}
}
response := map[string]any{
"labels": labels,
"totalCount": int(query.Repository.Labels.TotalCount),
}
out, err := json.Marshal(response)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal labels: %w", err)
}
return utils.NewToolResultText(string(out)), nil, nil
},
)
}
// LabelWrite handles create, update, and delete operations for GitHub labels
func LabelWrite(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetLabels,
mcp.Tool{
Name: "label_write",
Description: t("TOOL_LABEL_WRITE_DESCRIPTION", "Perform write operations on repository labels. To set labels on issues, use the 'update_issue' tool."),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_LABEL_WRITE_TITLE", "Write operations on repository labels."),
ReadOnlyHint: false,
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"method": {
Type: "string",
Description: "Operation to perform: 'create', 'update', or 'delete'",
Enum: []any{"create", "update", "delete"},
},
"owner": {
Type: "string",
Description: "Repository owner (username or organization name)",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"name": {
Type: "string",
Description: "Label name - required for all operations",
},
"new_name": {
Type: "string",
Description: "New name for the label (used only with 'update' method to rename)",
},
"color": {
Type: "string",
Description: "Label color as 6-character hex code without '#' prefix (e.g., 'f29513'). Required for 'create', optional for 'update'.",
},
"description": {
Type: "string",
Description: "Label description text. Optional for 'create' and 'update'.",
},
},
Required: []string{"method", "owner", "repo", "name"},
},
},
[]scopes.Scope{scopes.Repo},
func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
// Get and validate required parameters
method, err := RequiredParam[string](args, "method")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
method = strings.ToLower(method)
owner, err := RequiredParam[string](args, "owner")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
repo, err := RequiredParam[string](args, "repo")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
name, err := RequiredParam[string](args, "name")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
// Get optional parameters
newName, _ := OptionalParam[string](args, "new_name")
color, _ := OptionalParam[string](args, "color")
description, _ := OptionalParam[string](args, "description")
client, err := deps.GetGQLClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
switch method {
case "create":
// Validate required params for create
if color == "" {
return utils.NewToolResultError("color is required for create"), nil, nil
}
// Get repository ID
repoID, err := getRepositoryID(ctx, client, owner, repo)
if err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to find repository", err), nil, nil
}
input := githubv4.CreateLabelInput{
RepositoryID: repoID,
Name: githubv4.String(name),
Color: githubv4.String(color),
}
if description != "" {
d := githubv4.String(description)
input.Description = &d
}
var mutation struct {
CreateLabel struct {
Label struct {
Name githubv4.String
ID githubv4.ID
}
} `graphql:"createLabel(input: $input)"`
}
if err := client.Mutate(ctx, &mutation, input, nil); err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to create label", err), nil, nil
}
return utils.NewToolResultText(fmt.Sprintf("label '%s' created successfully", mutation.CreateLabel.Label.Name)), nil, nil
case "update":
// Validate required params for update
if newName == "" && color == "" && description == "" {
return utils.NewToolResultError("at least one of new_name, color, or description must be provided for update"), nil, nil
}
// Get the label ID
labelID, err := getLabelID(ctx, client, owner, repo, name)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
input := githubv4.UpdateLabelInput{
ID: labelID,
}
if newName != "" {
n := githubv4.String(newName)
input.Name = &n
}
if color != "" {
c := githubv4.String(color)
input.Color = &c
}
if description != "" {
d := githubv4.String(description)
input.Description = &d
}
var mutation struct {
UpdateLabel struct {
Label struct {
Name githubv4.String
ID githubv4.ID
}
} `graphql:"updateLabel(input: $input)"`
}
if err := client.Mutate(ctx, &mutation, input, nil); err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to update label", err), nil, nil
}
return utils.NewToolResultText(fmt.Sprintf("label '%s' updated successfully", mutation.UpdateLabel.Label.Name)), nil, nil
case "delete":
// Get the label ID
labelID, err := getLabelID(ctx, client, owner, repo, name)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
input := githubv4.DeleteLabelInput{
ID: labelID,
}
var mutation struct {
DeleteLabel struct {
ClientMutationID githubv4.String
} `graphql:"deleteLabel(input: $input)"`
}
if err := client.Mutate(ctx, &mutation, input, nil); err != nil {
return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "Failed to delete label", err), nil, nil
}
return utils.NewToolResultText(fmt.Sprintf("label '%s' deleted successfully", name)), nil, nil
default:
return utils.NewToolResultError(fmt.Sprintf("unknown method: %s. Supported methods are: create, update, delete", method)), nil, nil
}
},
)
}
// Helper function to get repository ID
func getRepositoryID(ctx context.Context, client *githubv4.Client, owner, repo string) (githubv4.ID, error) {
var repoQuery struct {
Repository struct {
ID githubv4.ID
} `graphql:"repository(owner: $owner, name: $repo)"`
}
vars := map[string]any{
"owner": githubv4.String(owner),
"repo": githubv4.String(repo),
}
if err := client.Query(ctx, &repoQuery, vars); err != nil {
return "", err
}
return repoQuery.Repository.ID, nil
}
// Helper function to get label by name
func getLabelID(ctx context.Context, client *githubv4.Client, owner, repo, labelName string) (githubv4.ID, error) {
var query struct {
Repository struct {
Label struct {
ID githubv4.ID
Name githubv4.String
} `graphql:"label(name: $name)"`
} `graphql:"repository(owner: $owner, name: $repo)"`
}
vars := map[string]any{
"owner": githubv4.String(owner),
"repo": githubv4.String(repo),
"name": githubv4.String(labelName),
}
if err := client.Query(ctx, &query, vars); err != nil {
return "", err
}
if query.Repository.Label.Name == "" {
return "", fmt.Errorf("label '%s' not found in %s/%s", labelName, owner, repo)
}
return query.Repository.Label.ID, nil
}