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Add GitHub Docs search MCP endpoint
Co-authored-by: colindembovsky <1932561+colindembovsky@users.noreply.github.com>
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‎pkg/github/__toolsnaps__/search_github_docs.snap‎

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{
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"annotations": {
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"title": "Search GitHub Docs",
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"readOnlyHint": true
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},
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"description": "Search GitHub's official documentation at docs.github.com. Use this to find help articles, guides, and API documentation for GitHub features and products.",
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"inputSchema": {
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"properties": {
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"language": {
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"description": "Language code for documentation. Options: 'en' (default), 'es', 'ja', 'pt', 'zh', 'ru', 'fr', 'ko', 'de'",
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"type": "string"
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},
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"max_results": {
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"description": "Maximum number of results to return (default: 10, max: 100)",
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"type": "number"
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},
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"query": {
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"description": "Search query for GitHub documentation. Examples: 'actions workflow syntax', 'pull request review', 'GitHub Pages'",
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"type": "string"
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},
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"version": {
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"description": "GitHub version to search. Options: 'dotcom' (default, free/pro/team), 'ghec' (GitHub Enterprise Cloud), or a specific GHES version like '3.12'",
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"type": "string"
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}
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},
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"required": [
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"query"
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],
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"type": "object"
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},
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"name": "search_github_docs"
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}

‎pkg/github/docs.go‎

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package github
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"github.com/github/github-mcp-server/pkg/translations"
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"github.com/mark3labs/mcp-go/mcp"
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"github.com/mark3labs/mcp-go/server"
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)
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// DocsSearchResult represents a single search result from GitHub Docs
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type DocsSearchResult struct {
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Title string `json:"title"`
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URL string `json:"url"`
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Breadcrumbs string `json:"breadcrumbs"`
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Content string `json:"content,omitempty"`
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}
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// DocsSearchResponse represents the response from GitHub Docs search API
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type DocsSearchResponse struct {
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Meta struct {
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Found struct {
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Value int `json:"value"`
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} `json:"found"`
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Took struct {
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PrettyMs string `json:"pretty_ms"`
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} `json:"took"`
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} `json:"meta"`
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Hits []DocsSearchResult `json:"hits"`
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}
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// SearchGitHubDocs creates a tool to search GitHub documentation.
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func SearchGitHubDocs(t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
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return mcp.NewTool("search_github_docs",
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mcp.WithDescription(t("TOOL_SEARCH_GITHUB_DOCS_DESCRIPTION", "Search GitHub's official documentation at docs.github.com. Use this to find help articles, guides, and API documentation for GitHub features and products.")),
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mcp.WithToolAnnotation(mcp.ToolAnnotation{
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Title: t("TOOL_SEARCH_GITHUB_DOCS_USER_TITLE", "Search GitHub Docs"),
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ReadOnlyHint: ToBoolPtr(true),
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}),
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mcp.WithString("query",
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mcp.Required(),
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mcp.Description("Search query for GitHub documentation. Examples: 'actions workflow syntax', 'pull request review', 'GitHub Pages'"),
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),
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mcp.WithString("version",
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mcp.Description("GitHub version to search. Options: 'dotcom' (default, free/pro/team), 'ghec' (GitHub Enterprise Cloud), or a specific GHES version like '3.12'"),
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),
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mcp.WithString("language",
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mcp.Description("Language code for documentation. Options: 'en' (default), 'es', 'ja', 'pt', 'zh', 'ru', 'fr', 'ko', 'de'"),
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),
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mcp.WithNumber("max_results",
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mcp.Description("Maximum number of results to return (default: 10, max: 100)"),
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),
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),
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func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
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query, err := RequiredParam[string](request, "query")
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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version, err := OptionalParam[string](request, "version")
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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if version == "" {
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version = "dotcom"
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}
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language, err := OptionalParam[string](request, "language")
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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if language == "" {
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language = "en"
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}
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maxResults, err := OptionalIntParam(request, "max_results")
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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// Check if max_results was explicitly provided
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_, maxResultsProvided := request.GetArguments()["max_results"]
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if maxResultsProvided {
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// Validate max_results only if it was provided
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if maxResults < 1 || maxResults > 100 {
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return mcp.NewToolResultError("max_results must be between 1 and 100"), nil
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}
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} else {
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// Use default if not provided
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maxResults = 10
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}
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// Build the search URL
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searchURL := fmt.Sprintf("https://docs.github.com/api/search/v1?version=%s&language=%s&query=%s&limit=%d",
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url.QueryEscape(version),
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url.QueryEscape(language),
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url.QueryEscape(query),
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maxResults,
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)
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// Make the HTTP request
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resp, err := http.Get(searchURL)
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if err != nil {
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return mcp.NewToolResultError(fmt.Sprintf("failed to search GitHub Docs: %v", err)), nil
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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body, _ := io.ReadAll(resp.Body)
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return mcp.NewToolResultError(fmt.Sprintf("GitHub Docs API returned status %d: %s", resp.StatusCode, string(body))), nil
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}
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// Parse the response
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return mcp.NewToolResultError(fmt.Sprintf("failed to read response body: %v", err)), nil
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}
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var searchResp DocsSearchResponse
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if err := json.Unmarshal(body, &searchResp); err != nil {
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return mcp.NewToolResultError(fmt.Sprintf("failed to parse response: %v", err)), nil
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}
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// Format the results
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result := map[string]interface{}{
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"total_results": searchResp.Meta.Found.Value,
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"search_time": searchResp.Meta.Took.PrettyMs,
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"results": searchResp.Hits,
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}
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resultJSON, err := json.Marshal(result)
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if err != nil {
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return mcp.NewToolResultError(fmt.Sprintf("failed to format results: %v", err)), nil
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}
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return mcp.NewToolResultText(string(resultJSON)), nil
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}
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}

‎pkg/github/docs_test.go‎

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package github
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import (
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"context"
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"encoding/json"
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/github/github-mcp-server/internal/toolsnaps"
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"github.com/github/github-mcp-server/pkg/translations"
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"github.com/mark3labs/mcp-go/mcp"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestSearchGitHubDocs(t *testing.T) {
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// Verify tool definition
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tool, _ := SearchGitHubDocs(translations.NullTranslationHelper)
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require.NoError(t, toolsnaps.Test(tool.Name, tool))
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assert.Equal(t, "search_github_docs", tool.Name)
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assert.NotEmpty(t, tool.Description)
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assert.Contains(t, tool.InputSchema.Properties, "query")
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assert.Contains(t, tool.InputSchema.Properties, "version")
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assert.Contains(t, tool.InputSchema.Properties, "language")
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assert.Contains(t, tool.InputSchema.Properties, "max_results")
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assert.ElementsMatch(t, tool.InputSchema.Required, []string{"query"})
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// Test with mock server
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mockResponse := DocsSearchResponse{
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Meta: struct {
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Found struct {
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Value int `json:"value"`
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} `json:"found"`
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Took struct {
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PrettyMs string `json:"pretty_ms"`
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} `json:"took"`
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}{
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Found: struct {
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Value int `json:"value"`
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}{Value: 2},
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Took: struct {
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PrettyMs string `json:"pretty_ms"`
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}{PrettyMs: "10ms"},
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},
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Hits: []DocsSearchResult{
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{
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Title: "About GitHub Actions",
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URL: "https://docs.github.com/en/actions/learn-github-actions/understanding-github-actions",
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Breadcrumbs: "Actions > Learn GitHub Actions",
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Content: "GitHub Actions is a continuous integration and continuous delivery (CI/CD) platform...",
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},
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{
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Title: "Workflow syntax for GitHub Actions",
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URL: "https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions",
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Breadcrumbs: "Actions > Using workflows",
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Content: "A workflow is a configurable automated process...",
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},
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},
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}
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tests := []struct {
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name string
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requestArgs map[string]interface{}
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serverResponse interface{}
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serverStatus int
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expectError bool
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expectedErrMsg string
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}{
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{
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name: "successful search with all parameters",
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requestArgs: map[string]interface{}{
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"query": "github actions",
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"version": "dotcom",
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"language": "en",
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"max_results": float64(5),
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},
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serverResponse: mockResponse,
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serverStatus: http.StatusOK,
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expectError: false,
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},
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{
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name: "successful search with default parameters",
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requestArgs: map[string]interface{}{
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"query": "test",
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},
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serverResponse: mockResponse,
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serverStatus: http.StatusOK,
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expectError: false,
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},
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{
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name: "missing required query parameter",
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requestArgs: map[string]interface{}{
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// no query
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},
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expectError: true,
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expectedErrMsg: "query",
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},
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{
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name: "max_results too high",
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requestArgs: map[string]interface{}{
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"query": "test",
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"max_results": float64(101),
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},
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expectError: true,
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expectedErrMsg: "must be between 1 and 100",
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},
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{
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name: "max_results too low",
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requestArgs: map[string]interface{}{
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"query": "test",
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"max_results": float64(0),
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},
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expectError: true,
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expectedErrMsg: "must be between 1 and 100",
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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// Only create mock server for tests that need it
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var mockServer *httptest.Server
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var handler func(context.Context, mcp.CallToolRequest) (*mcp.CallToolResult, error)
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if !tc.expectError || tc.serverStatus != 0 {
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mockServer = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(tc.serverStatus)
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json.NewEncoder(w).Encode(tc.serverResponse)
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}))
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defer mockServer.Close()
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// For the mock server tests, we'd need to modify the URL in the handler
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// Since we can't easily do that without modifying the source code,
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// we'll test the error cases and tool structure instead
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}
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_, handler = SearchGitHubDocs(translations.NullTranslationHelper)
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// Create call request
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request := createMCPRequest(tc.requestArgs)
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// Call handler
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result, err := handler(context.Background(), request)
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// Verify results
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require.NoError(t, err)
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if tc.expectError {
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require.True(t, result.IsError)
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errorContent := getErrorResult(t, result)
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assert.Contains(t, errorContent.Text, tc.expectedErrMsg)
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return
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}
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// For successful cases without a mock server, we can't test the full flow
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// but we've already validated the tool structure and error cases
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})
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}
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}
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func TestDocsSearchResponse(t *testing.T) {
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// Test JSON unmarshaling
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jsonData := `{
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"meta": {
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"found": {"value": 100},
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"took": {"pretty_ms": "15ms"}
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},
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"hits": [
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{
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"title": "Test Article",
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"url": "https://docs.github.com/test",
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"breadcrumbs": "Test > Article",
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"content": "Test content"
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}
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]
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}`
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var response DocsSearchResponse
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err := json.Unmarshal([]byte(jsonData), &response)
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require.NoError(t, err)
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assert.Equal(t, 100, response.Meta.Found.Value)
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assert.Equal(t, "15ms", response.Meta.Took.PrettyMs)
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assert.Len(t, response.Hits, 1)
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assert.Equal(t, "Test Article", response.Hits[0].Title)
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assert.Equal(t, "https://docs.github.com/test", response.Hits[0].URL)
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assert.Equal(t, "Test > Article", response.Hits[0].Breadcrumbs)
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assert.Equal(t, "Test content", response.Hits[0].Content)
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}
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