Add list_org_issue_fields tool

README.md

@@ -873,6 +873,11 @@ The following sets of tools are available:
   - `since`: Filter by date (ISO 8601 timestamp) (string, optional)
   - `state`: Filter by state, by default both open and closed issues are returned when not provided (string, optional)
 
+- **list_org_issue_fields** - List organization issue fields
+  - **Required OAuth Scopes**: `read:org`
+  - **Accepted OAuth Scopes**: `admin:org`, `read:org`, `write:org`
+  - `org`: The organization name. The name is not case sensitive. (string, required)
+
 - **search_issues** - Search issues
   - **Required OAuth Scopes**: `repo`
   - `order`: Sort order (string, optional)

pkg/github/__toolsnaps__/list_org_issue_fields.snap

@@ -0,0 +1,20 @@
+{
+  "annotations": {
+    "readOnlyHint": true,
+    "title": "List organization issue fields"
+  },
+  "description": "List issue fields for an organization. Returns field definitions including name, type (text, number, date, single_select), and for single_select fields the list of valid option names.",
+  "inputSchema": {
+    "properties": {
+      "org": {
+        "description": "The organization name. The name is not case sensitive.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "org"
+    ],
+    "type": "object"
+  },
+  "name": "list_org_issue_fields"
+}

pkg/github/issue_fields.go

@@ -0,0 +1,99 @@
+package github
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	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"
+)
+
+// IssueField represents an organization-level issue field definition.
+type IssueField struct {
+	ID          int64                          `json:"id"`
+	NodeID      string                         `json:"node_id"`
+	Name        string                         `json:"name"`
+	Description string                         `json:"description,omitempty"`
+	DataType    string                         `json:"data_type"`
+	Visibility  string                         `json:"visibility"`
+	Options     []IssueSingleSelectFieldOption `json:"options,omitempty"`
+}
+
+// IssueSingleSelectFieldOption represents an option for a single_select issue field.
+type IssueSingleSelectFieldOption struct {
+	ID          int64  `json:"id"`
+	Name        string `json:"name"`
+	Description string `json:"description,omitempty"`
+	Color       string `json:"color"`
+	Priority    int64  `json:"priority"`
+}
+
+// ListOrgIssueFields creates a tool to list issue field definitions for an organization.
+func ListOrgIssueFields(t translations.TranslationHelperFunc) inventory.ServerTool {
+	return NewTool(
+		ToolsetMetadataIssues,
+		mcp.Tool{
+			Name:        "list_org_issue_fields",
+			Description: t("TOOL_LIST_ORG_ISSUE_FIELDS_DESCRIPTION", "List issue fields for an organization. Returns field definitions including name, type (text, number, date, single_select), and for single_select fields the list of valid option names."),
+			Annotations: &mcp.ToolAnnotations{
+				Title:        t("TOOL_LIST_ORG_ISSUE_FIELDS_USER_TITLE", "List organization issue fields"),
+				ReadOnlyHint: true,
+			},
+			InputSchema: &jsonschema.Schema{
+				Type: "object",
+				Properties: map[string]*jsonschema.Schema{
+					"org": {
+						Type:        "string",
+						Description: "The organization name. The name is not case sensitive.",
+					},
+				},
+				Required: []string{"org"},
+			},
+		},
+		[]scopes.Scope{scopes.ReadOrg},
+		func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
+			org, err := RequiredParam[string](args, "org")
+			if err != nil {
+				return utils.NewToolResultError(err.Error()), nil, nil
+			}
+
+			client, err := deps.GetClient(ctx)
+			if err != nil {
+				return utils.NewToolResultErrorFromErr("failed to get GitHub client", err), nil, nil
+			}
+
+			reqURL := fmt.Sprintf("orgs/%s/issue-fields", org)
+			req, err := client.NewRequest(http.MethodGet, reqURL, nil)
+			if err != nil {
+				return utils.NewToolResultErrorFromErr("failed to create request", err), nil, nil
+			}
+
+			var fields []*IssueField
+			resp, err := client.Do(ctx, req, &fields)
+			if err != nil {
+				if resp != nil && resp.StatusCode == http.StatusNotFound {
+					// Org doesn't have issue fields enabled — return empty list
+					result, marshalErr := json.Marshal([]*IssueField{})
+					if marshalErr != nil {
+						return utils.NewToolResultErrorFromErr("failed to marshal response", marshalErr), nil, nil
+					}
+					return utils.NewToolResultText(string(result)), nil, nil
+				}
+				return ghErrors.NewGitHubAPIErrorResponse(ctx, "failed to list issue fields", resp, err), nil, nil
+			}
+
+			r, err := json.Marshal(fields)
+			if err != nil {
+				return utils.NewToolResultErrorFromErr("failed to marshal issue fields", err), nil, nil
+			}
+
+			return utils.NewToolResultText(string(r)), nil, nil
+		})
+}

pkg/github/issue_fields_test.go

@@ -0,0 +1,173 @@
+package github
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/github/github-mcp-server/internal/toolsnaps"
+	"github.com/github/github-mcp-server/pkg/translations"
+	"github.com/google/go-github/v82/github"
+	"github.com/google/jsonschema-go/jsonschema"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_ListOrgIssueFields(t *testing.T) {
+	// Verify tool definition
+	serverTool := ListOrgIssueFields(translations.NullTranslationHelper)
+	tool := serverTool.Tool
+	require.NoError(t, toolsnaps.Test(tool.Name, tool))
+
+	assert.Equal(t, "list_org_issue_fields", tool.Name)
+	assert.NotEmpty(t, tool.Description)
+	assert.True(t, tool.Annotations.ReadOnlyHint)
+	assert.Contains(t, tool.InputSchema.(*jsonschema.Schema).Properties, "org")
+	assert.ElementsMatch(t, tool.InputSchema.(*jsonschema.Schema).Required, []string{"org"})
+
+	mockIssueFields := []*IssueField{
+		{
+			ID:          1,
+			NodeID:      "IFT_kwDNAd3NAZo",
+			Name:        "DRI",
+			Description: "Directly responsible individual",
+			DataType:    "text",
+			Visibility:  "organization_members_only",
+		},
+		{
+			ID:          2,
+			NodeID:      "IFSS_kwDNAd3NAZs",
+			Name:        "Priority",
+			Description: "Level of importance",
+			DataType:    "single_select",
+			Visibility:  "all",
+			Options: []IssueSingleSelectFieldOption{
+				{ID: 1, Name: "High", Color: "red", Priority: 1},
+				{ID: 2, Name: "Medium", Color: "yellow", Priority: 2},
+				{ID: 3, Name: "Low", Color: "gray", Priority: 3},
+			},
+		},
+	}
+
+	tests := []struct {
+		name                string
+		mockedClient        *http.Client
+		requestArgs         map[string]any
+		expectError         bool
+		expectedIssueFields []*IssueField
+		expectedErrMsg      string
+	}{
+		{
+			name: "successful issue fields retrieval",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				"GET /orgs/testorg/issue-fields": mockResponse(t, http.StatusOK, mockIssueFields),
+			}),
+			requestArgs: map[string]any{
+				"org": "testorg",
+			},
+			expectError:         false,
+			expectedIssueFields: mockIssueFields,
+		},
+		{
+			name: "issue fields not enabled returns empty list",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				"GET /orgs/testorg/issue-fields": mockResponse(t, http.StatusNotFound, `{"message": "Not Found"}`),
+			}),
+			requestArgs: map[string]any{
+				"org": "testorg",
+			},
+			expectError:         false,
+			expectedIssueFields: []*IssueField{},
+		},
+		{
+			name: "missing org parameter",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				"GET /orgs/testorg/issue-fields": mockResponse(t, http.StatusOK, mockIssueFields),
+			}),
+			requestArgs:    map[string]any{},
+			expectError:    false,
+			expectedErrMsg: "missing required parameter: org",
+		},
+		{
+			name: "forbidden returns error",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				"GET /orgs/testorg/issue-fields": mockResponse(t, http.StatusForbidden, `{"message": "Forbidden"}`),
+			}),
+			requestArgs: map[string]any{
+				"org": "testorg",
+			},
+			expectError:    true,
+			expectedErrMsg: "failed to list issue fields",
+		},
+		{
+			name: "internal server error returns error",
+			mockedClient: MockHTTPClientWithHandlers(map[string]http.HandlerFunc{
+				"GET /orgs/testorg/issue-fields": mockResponse(t, http.StatusInternalServerError, `{"message": "Internal Server Error"}`),
+			}),
+			requestArgs: map[string]any{
+				"org": "testorg",
+			},
+			expectError:    true,
+			expectedErrMsg: "failed to list issue fields",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client := github.NewClient(tc.mockedClient)
+			deps := BaseDeps{
+				Client: client,
+			}
+			handler := serverTool.Handler(deps)
+
+			request := createMCPRequest(tc.requestArgs)
+
+			result, err := handler(ContextWithDeps(context.Background(), deps), &request)
+
+			if tc.expectError {
+				if err != nil {
+					assert.Contains(t, err.Error(), tc.expectedErrMsg)
+					return
+				}
+				require.NotNil(t, result)
+				require.True(t, result.IsError)
+				errorContent := getErrorResult(t, result)
+				assert.Contains(t, errorContent.Text, tc.expectedErrMsg)
+				return
+			}
+
+			if result != nil && result.IsError {
+				errorContent := getErrorResult(t, result)
+				if tc.expectedErrMsg != "" && strings.Contains(errorContent.Text, tc.expectedErrMsg) {
+					return
+				}
+			}
+
+			require.NoError(t, err)
+			require.NotNil(t, result)
+			require.False(t, result.IsError)
+			textContent := getTextResult(t, result)
+
+			var returnedFields []*IssueField
+			err = json.Unmarshal([]byte(textContent.Text), &returnedFields)
+			require.NoError(t, err)
+
+			require.Equal(t, len(tc.expectedIssueFields), len(returnedFields))
+			for i, expected := range tc.expectedIssueFields {
+				assert.Equal(t, expected.ID, returnedFields[i].ID)
+				assert.Equal(t, expected.Name, returnedFields[i].Name)
+				assert.Equal(t, expected.DataType, returnedFields[i].DataType)
+				assert.Equal(t, expected.Visibility, returnedFields[i].Visibility)
+				if expected.Options != nil {
+					require.Equal(t, len(expected.Options), len(returnedFields[i].Options))
+					for j, opt := range expected.Options {
+						assert.Equal(t, opt.Name, returnedFields[i].Options[j].Name)
+						assert.Equal(t, opt.Color, returnedFields[i].Options[j].Color)
+					}
+				}
+			}
+		})
+	}
+}

pkg/github/tools.go

@@ -208,6 +208,7 @@ func AllTools(t translations.TranslationHelperFunc) []inventory.ServerTool {
 		SearchIssues(t),
 		ListIssues(t),
 		ListIssueTypes(t),
+		ListOrgIssueFields(t),
 		IssueWrite(t),
 		AddIssueComment(t),
 		SubIssueWrite(t),