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package github
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/http"
"slices"
"strconv"
"strings"
"time"
ghErrors "github.com/github/github-mcp-server/pkg/errors"
"github.com/github/github-mcp-server/pkg/ifc"
"github.com/github/github-mcp-server/pkg/inventory"
"github.com/github/github-mcp-server/pkg/octicons"
"github.com/github/github-mcp-server/pkg/sanitize"
"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/go-github/v89/github"
"github.com/google/jsonschema-go/jsonschema"
"github.com/modelcontextprotocol/go-sdk/mcp"
"github.com/shurcooL/githubv4"
)
func GetCommit(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "get_commit",
Description: t("TOOL_GET_COMMITS_DESCRIPTION", "Get details for a commit from a GitHub repository"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_GET_COMMITS_USER_TITLE", "Get commit details"),
ReadOnlyHint: true,
},
InputSchema: WithPagination(&jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"sha": {
Type: "string",
Description: "Commit SHA, branch name, or tag name",
},
"detail": {
Type: "string",
Enum: []any{"none", "stats", "full_patch"},
Description: "Level of detail to include for changed files. \"none\" omits stats and files entirely. \"stats\" (default) includes per-file metadata: filename, status, and lines-of-code counts (additions, deletions, changes), with no patch content. \"full_patch\" additionally includes the unified diff content for each file and can be very large.",
Default: json.RawMessage(`"stats"`),
},
},
Required: []string{"owner", "repo", "sha"},
}),
},
scopes.PublicRead(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
}
sha, err := RequiredParam[string](args, "sha")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
detailRaw, err := OptionalParam[string](args, "detail")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
detail, err := parseCommitDetail(detailRaw)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
pagination, err := OptionalPaginationParams(args)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
opts := &github.ListOptions{
Page: pagination.Page,
PerPage: pagination.PerPage,
}
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
commit, resp, err := client.Repositories.GetCommit(ctx, owner, repo, sha, opts)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
fmt.Sprintf("failed to get commit: %s", sha),
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != 200 {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to get commit", resp, body), nil, nil
}
// Convert to minimal commit
minimalCommit := convertToMinimalCommit(commit, detail)
r, err := json.Marshal(minimalCommit)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal response: %w", err)
}
result := utils.NewToolResultText(string(r))
// Commit content is reachable from the repo's history; in public
// repos anyone can land it via a PR (untrusted), in private repos
// only collaborators can (trusted). Confidentiality follows repo
// visibility.
result = attachRepoVisibilityIFCLabel(ctx, deps, client, owner, repo, result, ifc.LabelCommitContents)
return result, nil, nil
},
)
}
// ListCommits creates a tool to get the list of commits of a branch in a GitHub
// repository.
func ListCommits(t translations.TranslationHelperFunc) inventory.ServerTool {
schema := &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"sha": {
Type: "string",
Description: "Commit SHA, branch or tag name to list commits of. If not provided, uses the default branch of the repository. If a commit SHA is provided, will list commits up to that SHA.",
},
"author": {
Type: "string",
Description: "Author username or email address to filter commits by",
},
"path": {
Type: "string",
Description: "Only commits containing this file path will be returned",
},
"since": {
Type: "string",
Description: "Only commits after this date will be returned (ISO 8601 format: YYYY-MM-DDTHH:MM:SSZ or YYYY-MM-DD)",
},
"until": {
Type: "string",
Description: "Only commits before this date will be returned (ISO 8601 format: YYYY-MM-DDTHH:MM:SSZ or YYYY-MM-DD)",
},
},
Required: []string{"owner", "repo"},
}
schema.Properties["fields"] = fieldsSchemaProperty(
"Subset of fields to return for each commit. If omitted, all fields are returned. Use this to reduce response size when you only need specific fields, e.g. just 'sha' and 'html_url'.",
listCommitsItemFieldEnum,
)
WithPagination(schema)
return NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "list_commits",
Description: t("TOOL_LIST_COMMITS_DESCRIPTION", "Get list of commits of a branch in a GitHub repository. Returns at least 30 results per page by default, but can return more if specified using the perPage parameter (up to 100)."),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_LIST_COMMITS_USER_TITLE", "List commits"),
ReadOnlyHint: true,
},
InputSchema: schema,
},
scopes.PublicRead(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
}
sha, err := OptionalParam[string](args, "sha")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
author, err := OptionalParam[string](args, "author")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
path, err := OptionalParam[string](args, "path")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
fields, err := OptionalStringArrayParam(args, "fields")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
sinceStr, err := OptionalParam[string](args, "since")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
untilStr, err := OptionalParam[string](args, "until")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
pagination, err := OptionalPaginationParams(args)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
// Set default perPage to 30 if not provided
perPage := pagination.PerPage
if perPage == 0 {
perPage = 30
}
opts := &github.CommitsListOptions{
SHA: sha,
Path: path,
Author: author,
ListOptions: github.ListOptions{
Page: pagination.Page,
PerPage: perPage,
},
}
if sinceStr != "" {
sinceTime, err := parseISOTimestamp(sinceStr)
if err != nil {
return utils.NewToolResultError(fmt.Sprintf("invalid since timestamp: %s", err)), nil, nil
}
opts.Since = sinceTime
}
if untilStr != "" {
untilTime, err := parseISOTimestamp(untilStr)
if err != nil {
return utils.NewToolResultError(fmt.Sprintf("invalid until timestamp: %s", err)), nil, nil
}
opts.Until = untilTime
}
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
commits, resp, err := client.Repositories.ListCommits(ctx, owner, repo, opts)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
fmt.Sprintf("failed to list commits: %s", sha),
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != 200 {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to list commits", resp, body), nil, nil
}
// Convert to minimal commits
minimalCommits := make([]MinimalCommit, len(commits))
for i, commit := range commits {
minimalCommits[i] = convertToMinimalCommit(commit, commitDetailNone)
}
filtered := false
var payload any = minimalCommits
if len(fields) > 0 {
filteredCommits, err := filterEachField(minimalCommits, fields)
if err != nil {
return utils.NewToolResultErrorFromErr("failed to filter commits", err), nil, nil
}
payload = filteredCommits
filtered = true
}
r, err := json.Marshal(payload)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal response: %w", err)
}
recordFieldsUsageFor(ctx, deps, "list_commits", minimalCommits, filtered, len(r))
result := utils.NewToolResultText(string(r))
// Commit content is reachable from the repo's history; integrity
// follows the same public-untrusted / private-trusted rule as file
// contents. Confidentiality follows repo visibility.
result = attachRepoVisibilityIFCLabel(ctx, deps, client, owner, repo, result, ifc.LabelCommitContents)
return result, nil, nil
},
)
}
// ListBranches creates a tool to list branches in a GitHub repository.
func ListBranches(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "list_branches",
Description: t("TOOL_LIST_BRANCHES_DESCRIPTION", "List branches in a GitHub repository"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_LIST_BRANCHES_USER_TITLE", "List branches"),
ReadOnlyHint: true,
},
InputSchema: WithPagination(&jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner",
},
"repo": {
Type: "string",
Description: "Repository name",
},
},
Required: []string{"owner", "repo"},
}),
},
scopes.PublicRead(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
}
pagination, err := OptionalPaginationParams(args)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
opts := &github.BranchListOptions{
ListOptions: github.ListOptions{
Page: pagination.Page,
PerPage: pagination.PerPage,
},
}
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
branches, resp, err := client.Repositories.ListBranches(ctx, owner, repo, opts)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to list branches",
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusOK {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to list branches", resp, body), nil, nil
}
// Convert to minimal branches
minimalBranches := make([]MinimalBranch, 0, len(branches))
for _, branch := range branches {
minimalBranches = append(minimalBranches, convertToMinimalBranch(branch))
}
r, err := json.Marshal(minimalBranches)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal response: %w", err)
}
result := utils.NewToolResultText(string(r))
// Branches are structural repo metadata that only collaborators
// with push access can create, so integrity is trusted.
// Confidentiality follows repo visibility.
result = attachRepoVisibilityIFCLabel(ctx, deps, client, owner, repo, result, ifc.LabelRepoMetadata)
return result, nil, nil
},
)
}
// CreateOrUpdateFile creates a tool to create or update a file in a GitHub repository.
func CreateOrUpdateFile(t translations.TranslationHelperFunc) inventory.ServerTool {
tool := NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "create_or_update_file",
Description: t("TOOL_CREATE_OR_UPDATE_FILE_DESCRIPTION", `Create or update a single file in a GitHub repository.
If updating, you should provide the SHA of the file you want to update. Use this tool to create or update a file in a GitHub repository remotely; do not use it for local file operations.
To obtain the current blob SHA before updating, call the get_file_contents tool with the same owner, repo, and path, and set its ref parameter to this tool's branch value. The first text result reports the blob SHA for the requested path.
SHA MUST be provided for existing file updates.
`),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_CREATE_OR_UPDATE_FILE_USER_TITLE", "Create or update file"),
ReadOnlyHint: false,
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner (username or organization)",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"path": {
Type: "string",
Description: "Path where to create/update the file",
},
"content": {
Type: "string",
Description: "Content of the file, exactly as it should appear once written. Do not base64-encode it; this server does that before calling the REST API.",
},
"message": {
Type: "string",
Description: "Commit message",
},
"branch": {
Type: "string",
Description: "Branch to create/update the file in",
},
"sha": {
Type: "string",
Description: "The blob SHA of the file being replaced. Required if the file already exists. Retrieve it with get_file_contents using the same owner, repo, and path, with ref set to this tool's branch value.",
},
"allow_symlink_write": {
Type: "boolean",
Description: "Set true to update a symbolic link itself; content must be its new target path.",
Default: json.RawMessage("false"),
},
},
Required: []string{"owner", "repo", "path", "content", "message", "branch"},
},
},
scopes.RequireAll(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
}
path, err := RequiredParam[string](args, "path")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
path, err = validateRelativePath(path)
if err != nil {
return utils.NewToolResultError(fmt.Sprintf("invalid path: %s", err)), nil, nil
}
content, err := RequiredParam[string](args, "content")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
message, err := RequiredParam[string](args, "message")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
branch, err := RequiredParam[string](args, "branch")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
// json.Marshal encodes byte arrays with base64, which is required for the API.
contentBytes := []byte(content)
// Create the file options
opts := &github.RepositoryContentFileOptions{
Message: github.Ptr(message),
Content: contentBytes,
Branch: github.Ptr(branch),
}
// If SHA is provided, set it (for updates)
sha, err := OptionalParam[string](args, "sha")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
if sha != "" {
opts.SHA = github.Ptr(sha)
}
allowSymlinkWrite, err := OptionalParam[bool](args, "allow_symlink_write")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
// Create or update the file
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
// SHA validation using Contents API to fetch current file metadata (blob SHA)
getOpts := &github.RepositoryContentGetOptions{Ref: branch}
if sha != "" {
// User provided SHA - validate it's still current
existingFile, dirContent, respCheck, getErr := client.Repositories.GetContents(ctx, owner, repo, path, getOpts)
if respCheck != nil {
_ = respCheck.Body.Close()
}
switch {
case getErr != nil:
// 404 means file doesn't exist - proceed (new file creation)
// Any other error (403, 500, network) should be surfaced
if respCheck == nil || respCheck.StatusCode != http.StatusNotFound {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to verify file SHA",
respCheck,
getErr,
), nil, nil
}
case dirContent != nil:
return utils.NewToolResultError(fmt.Sprintf(
"Path %s is a directory, not a file. This tool only works with files.",
path)), nil, nil
case existingFile != nil:
currentSHA := existingFile.GetSHA()
if currentSHA != sha {
return utils.NewToolResultError(fmt.Sprintf(
"SHA mismatch: provided SHA %s is stale. Current file SHA is %s. "+
"The file changed since you read it. Call get_file_contents with owner=%q, repo=%q, path=%q, and ref=%q; "+
"its first text result reports the blob SHA for the requested path. "+
"Rebuild your content against what it returns, and retry with the sha parameter set to the SHA that call reports.",
sha, currentSHA, owner, repo, path, branch)), nil, nil
}
if !allowSymlinkWrite {
if existingFile.GetType() == "symlink" {
return newSymlinkWriteBlockedResult(path, existingFile.GetTarget()), nil, nil
}
symlinkTarget, isSymlink, respTree, err := symlinkTargetAtPath(ctx, client, owner, repo, branch, path)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to verify whether file path is a symbolic link",
respTree,
err,
), nil, nil
}
if isSymlink {
return newSymlinkWriteBlockedResult(path, symlinkTarget), nil, nil
}
}
}
} else {
// No SHA provided - check if file already exists
existingFile, dirContent, respCheck, getErr := client.Repositories.GetContents(ctx, owner, repo, path, getOpts)
if respCheck != nil {
_ = respCheck.Body.Close()
}
switch {
case getErr != nil:
// 404 means file doesn't exist - proceed with creation
// Any other error (403, 500, network) should be surfaced
if respCheck == nil || respCheck.StatusCode != http.StatusNotFound {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to check if file exists",
respCheck,
getErr,
), nil, nil
}
case dirContent != nil:
return utils.NewToolResultError(fmt.Sprintf(
"Path %s is a directory, not a file. This tool only works with files.",
path)), nil, nil
case existingFile != nil:
// File exists but no SHA was provided - reject to prevent blind overwrites
return utils.NewToolResultError(fmt.Sprintf(
"File already exists at %s. You must provide the current file's SHA when updating. "+
"Call get_file_contents with owner=%q, repo=%q, path=%q, and ref=%q to read the file you are about to overwrite; "+
"its first text result reports the blob SHA for the requested path. "+
"Then retry with the sha parameter set to the blob SHA that call reports.",
path, owner, repo, path, branch)), nil, nil
}
// If file not found, no previous SHA needed (new file creation)
}
fileContent, resp, err := client.Repositories.CreateFile(ctx, owner, repo, path, opts)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to create/update file",
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != 200 && resp.StatusCode != 201 {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to create/update file", resp, body), nil, nil
}
minimalResponse := convertToMinimalFileContentResponse(fileContent)
return MarshalledTextResult(minimalResponse), nil, nil
},
)
tool.ScopeAccess = scopes.DynamicChallenge(
[]scopes.Scope{scopes.Repo, scopes.Workflow},
tool.ScopeAccess.Visible,
workflowScopeChallengeForPath,
)
return tool
}
// CreateRepository creates a tool to create a new GitHub repository.
func CreateRepository(t translations.TranslationHelperFunc) inventory.ServerTool {
return NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "create_repository",
Description: t("TOOL_CREATE_REPOSITORY_DESCRIPTION", "Create a new GitHub repository in your account or specified organization"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_CREATE_REPOSITORY_USER_TITLE", "Create repository"),
ReadOnlyHint: false,
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"name": {
Type: "string",
Description: "Repository name",
},
"description": {
Type: "string",
Description: "Repository description",
},
"organization": {
Type: "string",
Description: "Organization to create the repository in (omit to create in your personal account)",
},
"private": {
Type: "boolean",
Description: "Whether the repository should be private. Defaults to true (private) when omitted.",
Default: json.RawMessage("true"),
},
"autoInit": {
Type: "boolean",
Description: "Initialize with README",
},
},
Required: []string{"name"},
},
},
scopes.RequireAll(scopes.Repo),
func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
name, err := RequiredParam[string](args, "name")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
description, err := OptionalParam[string](args, "description")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
organization, err := OptionalParam[string](args, "organization")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
private, err := OptionalBoolParamWithDefault(args, "private", true)
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
autoInit, err := OptionalParam[bool](args, "autoInit")
if err != nil {
return utils.NewToolResultError(err.Error()), nil, nil
}
repo := &github.Repository{
Name: github.Ptr(name),
Description: github.Ptr(description),
Private: github.Ptr(private),
AutoInit: github.Ptr(autoInit),
}
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
createdRepo, resp, err := client.Repositories.Create(ctx, organization, repo)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
"failed to create repository",
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusCreated {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to create repository", resp, body), nil, nil
}
// Return minimal response with just essential information
minimalResponse := MinimalResponse{
ID: fmt.Sprintf("%d", createdRepo.GetID()),
URL: createdRepo.GetHTMLURL(),
}
r, err := json.Marshal(minimalResponse)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal response: %w", err)
}
return utils.NewToolResultText(string(r)), nil, nil
},
)
}
const (
DeleteRepositoryToolName = "delete_repository"
deleteRepositoryConfirmationID = "delete_repository_confirmation"
deleteRepositoryConfirmationField = "repository_name"
deleteRepositoryConfirmationTTL = 10 * time.Minute
)
type deleteRepositoryState struct {
Owner string `json:"owner"`
Repo string `json:"repo"`
RepositoryID int64 `json:"repository_id"`
ExpiresAt int64 `json:"expires_at"`
}
// DeleteRepository creates a tool that deletes a GitHub repository after the
// user confirms its full name through elicitation.
func DeleteRepository(t translations.TranslationHelperFunc) inventory.ServerTool {
tool := NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: DeleteRepositoryToolName,
Description: t("TOOL_DELETE_REPOSITORY_DESCRIPTION", "Delete a GitHub repository after the user confirms the exact owner/repository name"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_DELETE_REPOSITORY_USER_TITLE", "Delete repository"),
ReadOnlyHint: false,
DestructiveHint: github.Ptr(true),
},
InputSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner (username or organization)",
},
"repo": {
Type: "string",
Description: "Repository name",
},
},
Required: []string{"owner", "repo"},
},
},
scopes.RequireAll(scopes.DeleteRepo, scopes.Repo),
func(ctx context.Context, deps ToolDependencies, req *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
}
fullName := owner + "/" + repo
sealer := requestStateSealerFromDeps(deps)
if sealer == nil {
return utils.NewToolResultError("Repository deletion is unavailable because request-state protection is not configured."), nil, nil
}
var deletionState deleteRepositoryState
var responses mcp.InputResponseMap
if req != nil && req.Params != nil {
responses = req.Params.InputResponses
}
response, ok := responses[deleteRepositoryConfirmationID]
if !ok {
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
repositoryID, result := repositoryIDForDeletion(ctx, client, owner, repo)
if result != nil {
return result, nil, nil
}
state, err := json.Marshal(deleteRepositoryState{
Owner: owner,
Repo: repo,
RepositoryID: repositoryID,
ExpiresAt: time.Now().Add(deleteRepositoryConfirmationTTL).Unix(),
})
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal repository deletion state: %w", err)
}
requestState, err := sealer.Seal(ctx, state)
if err != nil {
return nil, nil, fmt.Errorf("failed to seal repository deletion state: %w", err)
}
return &mcp.CallToolResult{
InputRequests: mcp.InputRequestMap{
deleteRepositoryConfirmationID: &mcp.ElicitParams{
Mode: "form",
Message: fmt.Sprintf("Type %q to confirm permanent deletion of this repository.", fullName),
RequestedSchema: &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
deleteRepositoryConfirmationField: {
Type: "string",
Title: "Repository name",
Description: fmt.Sprintf("Enter %s exactly to confirm deletion", fullName),
},
},
Required: []string{deleteRepositoryConfirmationField},
},
},
},
RequestState: requestState,
}, nil, nil
}
if req.Params.RequestState == "" {
return utils.NewToolResultError("Repository deletion confirmation state was missing. The repository was not deleted."), nil, nil
}
stateJSON, err := sealer.Open(req.Params.RequestState)
if err != nil {
return utils.NewToolResultError("Repository deletion confirmation state was invalid. The repository was not deleted."), nil, nil
}
if err := json.Unmarshal(stateJSON, &deletionState); err != nil {
return utils.NewToolResultError("Repository deletion confirmation state was invalid. The repository was not deleted."), nil, nil
}
if deletionState.Owner != owner || deletionState.Repo != repo {
return utils.NewToolResultError("Repository deletion target changed after confirmation was requested. The repository was not deleted."), nil, nil
}
if deletionState.ExpiresAt <= time.Now().Unix() {
return utils.NewToolResultError("Repository deletion confirmation expired. The repository was not deleted."), nil, nil
}
if deletionState.RepositoryID == 0 {
return utils.NewToolResultError("Repository deletion confirmation state was invalid. The repository was not deleted."), nil, nil
}
confirmation, ok := response.(*mcp.ElicitResult)
if !ok {
return utils.NewToolResultError("Repository deletion confirmation was invalid. The repository was not deleted."), nil, nil
}
if confirmation.Action != "accept" {
return utils.NewToolResultError("Repository deletion was not confirmed. The repository was not deleted."), nil, nil
}
confirmedName, ok := confirmation.Content[deleteRepositoryConfirmationField].(string)
if !ok || confirmedName != fullName {
return utils.NewToolResultError(fmt.Sprintf("Repository name confirmation did not match %q. The repository was not deleted.", fullName)), nil, nil
}
client, err := deps.GetClient(ctx)
if err != nil {
return nil, nil, fmt.Errorf("failed to get GitHub client: %w", err)
}
currentRepositoryID, result := repositoryIDForDeletion(ctx, client, owner, repo)
if result != nil {
return result, nil, nil
}
if currentRepositoryID != deletionState.RepositoryID {
return utils.NewToolResultError("Repository identity changed after confirmation was requested. The repository was not deleted."), nil, nil
}
resp, err := client.Repositories.Delete(ctx, owner, repo)
if err != nil {
return ghErrors.NewGitHubAPIErrorResponse(ctx,
fmt.Sprintf("failed to delete repository: %s", fullName),
resp,
err,
), nil, nil
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusNoContent {
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, nil, fmt.Errorf("failed to read response body: %w", err)
}
return ghErrors.NewGitHubAPIStatusErrorResponse(ctx, "failed to delete repository", resp, body), nil, nil
}
return utils.NewToolResultText(fmt.Sprintf("Repository %s was deleted.", fullName)), nil, nil
},
)
tool.MinimumProtocolVersion = inventory.ProtocolVersionMultiRoundTrip
tool.RequiredElicitationMode = inventory.ElicitationModeForm
return tool
}
func repositoryIDForDeletion(ctx context.Context, client *github.Client, owner, repo string) (int64, *mcp.CallToolResult) {
repository, resp, err := client.Repositories.Get(ctx, owner, repo)
if err != nil {
return 0, ghErrors.NewGitHubAPIErrorResponse(ctx,
fmt.Sprintf("failed to get repository: %s/%s", owner, repo),
resp,
err,
)
}
if resp != nil && resp.Body != nil {
defer func() { _ = resp.Body.Close() }()
}
return repository.GetID(), nil
}
// FetchRepoIsPrivate returns whether a repository is private. It is a thin
// wrapper around the GitHub Repositories.Get endpoint provided as a shared
// helper for IFC label computation across tools.
func FetchRepoIsPrivate(ctx context.Context, client *github.Client, owner, repo string) (bool, error) {
r, resp, err := client.Repositories.Get(ctx, owner, repo)
if resp != nil {
defer func() { _ = resp.Body.Close() }()
}
if err != nil {
return false, err
}
return r.GetPrivate(), nil
}
// GetFileContents creates a tool to get the contents of a file or directory from
// a GitHub repository.
func GetFileContents(t translations.TranslationHelperFunc) inventory.ServerTool {
schema := &jsonschema.Schema{
Type: "object",
Properties: map[string]*jsonschema.Schema{
"owner": {
Type: "string",
Description: "Repository owner (username or organization)",
},
"repo": {
Type: "string",
Description: "Repository name",
},
"path": {
Type: "string",
Description: "Path to file/directory",
Default: json.RawMessage(`"/"`),
},
"ref": {
Type: "string",
Description: "Accepts optional git refs such as `refs/tags/{tag}`, `refs/heads/{branch}` or `refs/pull/{pr_number}/head`",
},
"sha": {
Type: "string",
Description: "Accepts optional commit SHA. If specified, it will be used instead of ref",
},
},
Required: []string{"owner", "repo"},
}
schema.Properties["fields"] = fieldsSchemaProperty(
"Subset of fields to return for each entry when the path is a directory. If omitted, all fields are returned. Ignored when the path is a single file. Use this to reduce response size when listing directories and you only need specific fields, e.g. just 'name' and 'type'.",
fileContentFieldEnum,
)
return NewTool(
ToolsetMetadataRepos,
mcp.Tool{
Name: "get_file_contents",
Description: t("TOOL_GET_FILE_CONTENTS_DESCRIPTION", "Get the contents of a file or directory from a GitHub repository"),
Annotations: &mcp.ToolAnnotations{
Title: t("TOOL_GET_FILE_CONTENTS_USER_TITLE", "Get file or directory contents"),
ReadOnlyHint: true,
},
InputSchema: schema,
},
scopes.PublicRead(scopes.Repo),
func(ctx context.Context, deps ToolDependencies, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
owner, err := RequiredParam[string](args, "owner")
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