Add add_project_item tool

Author: JoannaaKL

README.md

@@ -658,6 +658,13 @@ The following sets of tools are available (all are on by default):
 
 <summary>Projects</summary>
 
+- **add_project_item** - Add project item
+  - `item_id`: The numeric ID of the issue or pull request to add to the project. (number, required)
+  - `item_type`: The item's type, either issue or pull_request. (string, required)
+  - `owner`: If owner_type == user it is the handle for the GitHub user account. If owner_type == org it is the name of the organization. The name is not case sensitive. (string, required)
+  - `owner_type`: Owner type (string, required)
+  - `project_number`: The project's number. (number, required)
+
 - **get_project** - Get project
   - `owner`: If owner_type == user it is the handle for the GitHub user account. If owner_type == org it is the name of the organization. The name is not case sensitive. (string, required)
   - `owner_type`: Owner type (string, required)

pkg/github/__toolsnaps__/add_project_item.snap

@@ -0,0 +1,48 @@
+{
+  "annotations": {
+    "title": "Add project item",
+    "readOnlyHint": false
+  },
+  "description": "Add a specific Project item for a user or org",
+  "inputSchema": {
+    "properties": {
+      "item_id": {
+        "description": "The numeric ID of the issue or pull request to add to the project.",
+        "type": "number"
+      },
+      "item_type": {
+        "description": "The item's type, either issue or pull_request.",
+        "enum": [
+          "issue",
+          "pull_request"
+        ],
+        "type": "string"
+      },
+      "owner": {
+        "description": "If owner_type == user it is the handle for the GitHub user account. If owner_type == org it is the name of the organization. The name is not case sensitive.",
+        "type": "string"
+      },
+      "owner_type": {
+        "description": "Owner type",
+        "enum": [
+          "user",
+          "org"
+        ],
+        "type": "string"
+      },
+      "project_number": {
+        "description": "The project's number.",
+        "type": "number"
+      }
+    },
+    "required": [
+      "owner_type",
+      "owner",
+      "project_number",
+      "item_type",
+      "item_id"
+    ],
+    "type": "object"
+  },
+  "name": "add_project_item"
+}

pkg/github/projects.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"reflect"
+	"strings"
 
 	ghErrors "github.com/github/github-mcp-server/pkg/errors"
 	"github.com/github/github-mcp-server/pkg/translations"
@@ -474,6 +475,90 @@ func GetProjectItem(getClient GetClientFn, t translations.TranslationHelperFunc)
 		}
 }
 
+func AddProjectItem(getClient GetClientFn, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
+	return mcp.NewTool("add_project_item",
+			mcp.WithDescription(t("TOOL_ADD_PROJECT_ITEM_DESCRIPTION", "Add a specific Project item for a user or org")),
+			mcp.WithToolAnnotation(mcp.ToolAnnotation{Title: t("TOOL_ADD_PROJECT_ITEM_USER_TITLE", "Add project item"), ReadOnlyHint: ToBoolPtr(false)}),
+			mcp.WithString("owner_type", mcp.Required(), mcp.Description("Owner type"), mcp.Enum("user", "org")),
+			mcp.WithString("owner", mcp.Required(), mcp.Description("If owner_type == user it is the handle for the GitHub user account. If owner_type == org it is the name of the organization. The name is not case sensitive.")),
+			mcp.WithNumber("project_number", mcp.Required(), mcp.Description("The project's number.")),
+			mcp.WithString("item_type", mcp.Required(), mcp.Description("The item's type, either issue or pull_request."), mcp.Enum("issue", "pull_request")),
+			mcp.WithNumber("item_id", mcp.Required(), mcp.Description("The numeric ID of the issue or pull request to add to the project.")),
+		), func(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+			owner, err := RequiredParam[string](req, "owner")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			ownerType, err := RequiredParam[string](req, "owner_type")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			projectNumber, err := RequiredInt(req, "project_number")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			itemID, err := RequiredInt(req, "item_id")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+
+			itemType, err := RequiredParam[string](req, "item_type")
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+			if itemType != "issue" && itemType != "pull_request" {
+				return mcp.NewToolResultError("item_type must be either 'issue' or 'pull_request'"), nil
+			}
+
+			client, err := getClient(ctx)
+			if err != nil {
+				return mcp.NewToolResultError(err.Error()), nil
+			}
+
+			var projectsURL string
+			if ownerType == "org" {
+				projectsURL = fmt.Sprintf("orgs/%s/projectsV2/%d/items", owner, projectNumber)
+			} else {
+				projectsURL = fmt.Sprintf("users/%s/projectsV2/%d/items", owner, projectNumber)
+			}
+			form := url.Values{}
+			form.Add("type", toNewProjectType(itemType))
+			form.Add("id", fmt.Sprintf("%d", itemID))
+
+			body := strings.NewReader(form.Encode())
+
+			httpRequest, err := client.NewFormRequest(projectsURL, body)
+			if err != nil {
+				return nil, fmt.Errorf("failed to create request: %w", err)
+			}
+			addedItem := projectV2Item{}
+
+			resp, err := client.Do(ctx, httpRequest, &addedItem)
+			if err != nil {
+				return ghErrors.NewGitHubAPIErrorResponse(ctx,
+					"failed to add a project item",
+					resp,
+					err,
+				), nil
+			}
+			defer func() { _ = resp.Body.Close() }()
+
+			if resp.StatusCode != http.StatusOK {
+				body, err := io.ReadAll(resp.Body)
+				if err != nil {
+					return nil, fmt.Errorf("failed to read response body: %w", err)
+				}
+				return mcp.NewToolResultError(fmt.Sprintf("failed to add a project item: %s", string(body))), nil
+			}
+			r, err := json.Marshal(convertToMinimalProjectItem(&addedItem))
+			if err != nil {
+				return nil, fmt.Errorf("failed to marshal response: %w", err)
+			}
+
+			return mcp.NewToolResultText(string(r)), nil
+		}
+}
+
 type projectV2Field struct {
 	ID        *int64            `json:"id,omitempty"`         // The unique identifier for this field.
 	NodeID    string            `json:"node_id,omitempty"`    // The GraphQL node ID for this field.
@@ -500,6 +585,17 @@ type projectV2Item struct {
 	Fields        []*projectV2Field `json:"fields,omitempty"`
 }
 
+func toNewProjectType(projType string) string {
+	switch strings.ToLower(projType) {
+	case "issue":
+		return "Issue"
+	case "pull_request":
+		return "PullRequest"
+	default:
+		return ""
+	}
+}
+
 type listProjectsOptions struct {
 	// For paginated result sets, the number of results to include per page.
 	PerPage int `url:"per_page,omitempty"`