feat: slim tool responses (#141)

Reduce token usage by slimming tool responses. Instead of returning full Gitea SDK objects (with nested user/repo objects, avatars, permissions, etc.), each operation now has a colocated `slim.go` that extracts only the fields an LLM needs. List endpoints return even fewer fields than single-item endpoints.

Other changes:
- Add `params` helpers to DRY parameter extraction across 40+ handlers
- Remove `{"Result": ...}` wrapper for flatter responses
- Reduce default pageSize from 100 to 30

Fixes: https://gitea.com/gitea/gitea-mcp/issues/128

*Created by Claude on behalf of @silverwind*

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/141
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>

operation/repo/branch.go

@@ -2,11 +2,11 @@ package repo
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
 	"gitea.com/gitea/gitea-mcp/pkg/log"
+	"gitea.com/gitea/gitea-mcp/pkg/params"
 	"gitea.com/gitea/gitea-mcp/pkg/to"
 
 	gitea_sdk "code.gitea.io/sdk/gitea"
@@ -63,19 +63,20 @@ func init() {
 
 func CreateBranchFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called CreateBranchFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	branch, ok := req.GetArguments()["branch"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("branch is required"))
+	branch, err := params.GetString(args, "branch")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	oldBranch, _ := req.GetArguments()["old_branch"].(string)
+	oldBranch, _ := args["old_branch"].(string)
 
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -94,17 +95,18 @@ func CreateBranchFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTool
 
 func DeleteBranchFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called DeleteBranchFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	branch, ok := req.GetArguments()["branch"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("branch is required"))
+	branch, err := params.GetString(args, "branch")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -120,18 +122,19 @@ func DeleteBranchFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTool
 
 func ListBranchesFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ListBranchesFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	opt := gitea_sdk.ListRepoBranchesOptions{
 		ListOptions: gitea_sdk.ListOptions{
 			Page:     1,
-			PageSize: 100,
+			PageSize: 30,
 		},
 	}
 	client, err := gitea.ClientFromContext(ctx)
@@ -143,5 +146,5 @@ func ListBranchesFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTool
 		return to.ErrorResult(fmt.Errorf("list branches error: %v", err))
 	}
 
-	return to.TextResult(branches)
+	return to.TextResult(slimBranches(branches))
 }

operation/repo/commit.go

@@ -2,7 +2,6 @@ package repo
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
@@ -27,7 +26,7 @@ var ListRepoCommitsTool = mcp.NewTool(
 	mcp.WithString("sha", mcp.Description("SHA or branch to start listing commits from")),
 	mcp.WithString("path", mcp.Description("path indicates that only commits that include the path's file/dir should be returned.")),
 	mcp.WithNumber("page", mcp.Required(), mcp.Description("page number"), mcp.DefaultNumber(1), mcp.Min(1)),
-	mcp.WithNumber("page_size", mcp.Required(), mcp.Description("page size"), mcp.DefaultNumber(50), mcp.Min(1)),
+	mcp.WithNumber("page_size", mcp.Required(), mcp.Description("page size"), mcp.DefaultNumber(30), mcp.Min(1)),
 )
 
 func init() {
@@ -39,24 +38,25 @@ func init() {
 
 func ListRepoCommitsFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ListRepoCommitsFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
-	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
-	}
-	page, err := params.GetIndex(req.GetArguments(), "page")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
 	if err != nil {
 		return to.ErrorResult(err)
 	}
-	pageSize, err := params.GetIndex(req.GetArguments(), "page_size")
+	repo, err := params.GetString(args, "repo")
 	if err != nil {
 		return to.ErrorResult(err)
 	}
-	sha, _ := req.GetArguments()["sha"].(string)
-	path, _ := req.GetArguments()["path"].(string)
+	page, err := params.GetIndex(args, "page")
+	if err != nil {
+		return to.ErrorResult(err)
+	}
+	pageSize, err := params.GetIndex(args, "page_size")
+	if err != nil {
+		return to.ErrorResult(err)
+	}
+	sha, _ := args["sha"].(string)
+	path, _ := args["path"].(string)
 	opt := gitea_sdk.ListCommitOptions{
 		ListOptions: gitea_sdk.ListOptions{
 			Page:     int(page),
@@ -73,5 +73,5 @@ func ListRepoCommitsFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallT
 	if err != nil {
 		return to.ErrorResult(fmt.Errorf("list repo commits err: %v", err))
 	}
-	return to.TextResult(commits)
+	return to.TextResult(slimCommits(commits))
 }

operation/repo/file.go

@@ -6,11 +6,11 @@ import (
 	"context"
 	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
 	"gitea.com/gitea/gitea-mcp/pkg/log"
+	"gitea.com/gitea/gitea-mcp/pkg/params"
 	"gitea.com/gitea/gitea-mcp/pkg/to"
 
 	gitea_sdk "code.gitea.io/sdk/gitea"
@@ -112,18 +112,19 @@ type ContentLine struct {
 
 func GetFileContentFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called GetFileFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	ref, _ := req.GetArguments()["ref"].(string)
-	filePath, ok := req.GetArguments()["filePath"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("filePath is required"))
+	ref, _ := args["ref"].(string)
+	filePath, err := params.GetString(args, "filePath")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -133,7 +134,7 @@ func GetFileContentFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTo
 	if err != nil {
 		return to.ErrorResult(fmt.Errorf("get file err: %v", err))
 	}
-	withLines, _ := req.GetArguments()["withLines"].(bool)
+	withLines, _ := args["withLines"].(bool)
 	if withLines {
 		rawContent, err := base64.StdEncoding.DecodeString(*content.Content)
 		if err != nil {
@@ -170,23 +171,24 @@ func GetFileContentFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTo
 		contentStr := string(contentBytes)
 		content.Content = &contentStr
 	}
-	return to.TextResult(content)
+	return to.TextResult(slimContents(content))
 }
 
 func GetDirContentFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called GetDirContentFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	ref, _ := req.GetArguments()["ref"].(string)
-	filePath, ok := req.GetArguments()["filePath"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("filePath is required"))
+	ref, _ := args["ref"].(string)
+	filePath, err := params.GetString(args, "filePath")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -196,26 +198,27 @@ func GetDirContentFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToo
 	if err != nil {
 		return to.ErrorResult(fmt.Errorf("get dir content err: %v", err))
 	}
-	return to.TextResult(content)
+	return to.TextResult(slimDirEntries(content))
 }
 
 func CreateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called CreateFileFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	filePath, ok := req.GetArguments()["filePath"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("filePath is required"))
+	filePath, err := params.GetString(args, "filePath")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	content, _ := req.GetArguments()["content"].(string)
-	message, _ := req.GetArguments()["message"].(string)
-	branchName, _ := req.GetArguments()["branch_name"].(string)
+	content, _ := args["content"].(string)
+	message, _ := args["message"].(string)
+	branchName, _ := args["branch_name"].(string)
 	opt := gitea_sdk.CreateFileOptions{
 		Content: base64.StdEncoding.EncodeToString([]byte(content)),
 		FileOptions: gitea_sdk.FileOptions{
@@ -237,25 +240,26 @@ func CreateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRe
 
 func UpdateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called UpdateFileFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	filePath, ok := req.GetArguments()["filePath"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("filePath is required"))
+	filePath, err := params.GetString(args, "filePath")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	sha, ok := req.GetArguments()["sha"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("sha is required"))
+	sha, err := params.GetString(args, "sha")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	content, _ := req.GetArguments()["content"].(string)
-	message, _ := req.GetArguments()["message"].(string)
-	branchName, _ := req.GetArguments()["branch_name"].(string)
+	content, _ := args["content"].(string)
+	message, _ := args["message"].(string)
+	branchName, _ := args["branch_name"].(string)
 
 	opt := gitea_sdk.UpdateFileOptions{
 		SHA:     sha,
@@ -278,23 +282,24 @@ func UpdateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRe
 
 func DeleteFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called DeleteFileFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("owner is required"))
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repo is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	filePath, ok := req.GetArguments()["filePath"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("filePath is required"))
+	filePath, err := params.GetString(args, "filePath")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	message, _ := req.GetArguments()["message"].(string)
-	branchName, _ := req.GetArguments()["branch_name"].(string)
-	sha, ok := req.GetArguments()["sha"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("sha is required"))
+	message, _ := args["message"].(string)
+	branchName, _ := args["branch_name"].(string)
+	sha, err := params.GetString(args, "sha")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	opt := gitea_sdk.DeleteFileOptions{
 		FileOptions: gitea_sdk.FileOptions{

operation/repo/release.go

@@ -2,9 +2,7 @@ package repo
 
 import (
 	"context"
-	"errors"
 	"fmt"
-	"time"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
 	"gitea.com/gitea/gitea-mcp/pkg/log"
@@ -96,44 +94,32 @@ func init() {
 	})
 }
 
-// To avoid return too many tokens, we need to provide at least information as possible
-// llm can call get release to get more information
-type ListReleaseResult struct {
-	ID           int64     `json:"id"`
-	TagName      string    `json:"tag_name"`
-	Target       string    `json:"target_commitish"`
-	Title        string    `json:"title"`
-	IsDraft      bool      `json:"draft"`
-	IsPrerelease bool      `json:"prerelease"`
-	CreatedAt    time.Time `json:"created_at"`
-	PublishedAt  time.Time `json:"published_at"`
-}
-
 func CreateReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called CreateReleasesFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	tagName, ok := req.GetArguments()["tag_name"].(string)
-	if !ok {
-		return nil, errors.New("tag_name is required")
+	tagName, err := params.GetString(args, "tag_name")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	target, ok := req.GetArguments()["target"].(string)
-	if !ok {
-		return nil, errors.New("target is required")
+	target, err := params.GetString(args, "target")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	title, ok := req.GetArguments()["title"].(string)
-	if !ok {
-		return nil, errors.New("title is required")
+	title, err := params.GetString(args, "title")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	isDraft, _ := req.GetArguments()["is_draft"].(bool)
-	isPreRelease, _ := req.GetArguments()["is_pre_release"].(bool)
-	body, _ := req.GetArguments()["body"].(string)
+	isDraft, _ := args["is_draft"].(bool)
+	isPreRelease, _ := args["is_pre_release"].(bool)
+	body, _ := args["body"].(string)
 
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -156,15 +142,16 @@ func CreateReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToo
 
 func DeleteReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called DeleteReleaseFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	id, err := params.GetIndex(req.GetArguments(), "id")
+	id, err := params.GetIndex(args, "id")
 	if err != nil {
 		return to.ErrorResult(err)
 	}
@@ -183,15 +170,16 @@ func DeleteReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToo
 
 func GetReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called GetReleaseFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	id, err := params.GetIndex(req.GetArguments(), "id")
+	id, err := params.GetIndex(args, "id")
 	if err != nil {
 		return to.ErrorResult(err)
 	}
@@ -205,18 +193,19 @@ func GetReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRe
 		return nil, fmt.Errorf("get release error: %v", err)
 	}
 
-	return to.TextResult(release)
+	return to.TextResult(slimRelease(release))
 }
 
 func GetLatestReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called GetLatestReleaseFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 
 	client, err := gitea.ClientFromContext(ctx)
@@ -228,31 +217,32 @@ func GetLatestReleaseFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.Call
 		return nil, fmt.Errorf("get latest release error: %v", err)
 	}
 
-	return to.TextResult(release)
+	return to.TextResult(slimRelease(release))
 }
 
 func ListReleasesFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ListReleasesFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 	var pIsDraft *bool
-	isDraft, ok := req.GetArguments()["is_draft"].(bool)
+	isDraft, ok := args["is_draft"].(bool)
 	if ok {
 		pIsDraft = new(isDraft)
 	}
 	var pIsPreRelease *bool
-	isPreRelease, ok := req.GetArguments()["is_pre_release"].(bool)
+	isPreRelease, ok := args["is_pre_release"].(bool)
 	if ok {
 		pIsPreRelease = new(isPreRelease)
 	}
-	page := params.GetOptionalInt(req.GetArguments(), "page", 1)
-	pageSize := params.GetOptionalInt(req.GetArguments(), "pageSize", 20)
+	page := params.GetOptionalInt(args, "page", 1)
+	pageSize := params.GetOptionalInt(args, "pageSize", 20)
 
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -270,18 +260,5 @@ func ListReleasesFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallTool
 		return nil, fmt.Errorf("list releases error: %v", err)
 	}
 
-	results := make([]ListReleaseResult, len(releases))
-	for _, release := range releases {
-		results = append(results, ListReleaseResult{
-			ID:           release.ID,
-			TagName:      release.TagName,
-			Target:       release.Target,
-			Title:        release.Title,
-			IsDraft:      release.IsDraft,
-			IsPrerelease: release.IsPrerelease,
-			CreatedAt:    release.CreatedAt,
-			PublishedAt:  release.PublishedAt,
-		})
-	}
-	return to.TextResult(results)
+	return to.TextResult(slimReleases(releases))
 }

operation/repo/repo.go

@@ -2,7 +2,6 @@ package repo
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
@@ -54,7 +53,7 @@ var (
 		ListMyReposToolName,
 		mcp.WithDescription("List my repositories"),
 		mcp.WithNumber("page", mcp.Required(), mcp.Description("Page number"), mcp.DefaultNumber(1), mcp.Min(1)),
-		mcp.WithNumber("pageSize", mcp.Required(), mcp.Description("Page size number"), mcp.DefaultNumber(100), mcp.Min(1)),
+		mcp.WithNumber("pageSize", mcp.Required(), mcp.Description("Page size number"), mcp.DefaultNumber(30), mcp.Min(1)),
 	)
 )
 
@@ -108,20 +107,21 @@ func RegisterTool(s *server.MCPServer) {
 
 func CreateRepoFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called CreateRepoFn")
-	name, ok := req.GetArguments()["name"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repository name is required"))
+	args := req.GetArguments()
+	name, err := params.GetString(args, "name")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	description, _ := req.GetArguments()["description"].(string)
-	private, _ := req.GetArguments()["private"].(bool)
-	issueLabels, _ := req.GetArguments()["issue_labels"].(string)
-	autoInit, _ := req.GetArguments()["auto_init"].(bool)
-	template, _ := req.GetArguments()["template"].(bool)
-	gitignores, _ := req.GetArguments()["gitignores"].(string)
-	license, _ := req.GetArguments()["license"].(string)
-	readme, _ := req.GetArguments()["readme"].(string)
-	defaultBranch, _ := req.GetArguments()["default_branch"].(string)
-	organization, _ := req.GetArguments()["organization"].(string)
+	description, _ := args["description"].(string)
+	private, _ := args["private"].(bool)
+	issueLabels, _ := args["issue_labels"].(string)
+	autoInit, _ := args["auto_init"].(bool)
+	template, _ := args["template"].(bool)
+	gitignores, _ := args["gitignores"].(string)
+	license, _ := args["license"].(string)
+	readme, _ := args["readme"].(string)
+	defaultBranch, _ := args["default_branch"].(string)
+	organization, _ := args["organization"].(string)
 
 	opt := gitea_sdk.CreateRepoOption{
 		Name:          name,
@@ -152,25 +152,26 @@ func CreateRepoFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRe
 			return to.ErrorResult(fmt.Errorf("create repository '%s' err: %v", name, err))
 		}
 	}
-	return to.TextResult(repo)
+	return to.TextResult(slimRepo(repo))
 }
 
 func ForkRepoFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ForkRepoFn")
-	user, ok := req.GetArguments()["user"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("user name is required"))
+	args := req.GetArguments()
+	user, err := params.GetString(args, "user")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return to.ErrorResult(errors.New("repository name is required"))
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	organization, ok := req.GetArguments()["organization"].(string)
+	organization, ok := args["organization"].(string)
 	organizationPtr := new(organization)
 	if !ok || organization == "" {
 		organizationPtr = nil
 	}
-	name, ok := req.GetArguments()["name"].(string)
+	name, ok := args["name"].(string)
 	namePtr := new(name)
 	if !ok || name == "" {
 		namePtr = nil
@@ -192,12 +193,11 @@ func ForkRepoFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResu
 
 func ListMyReposFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ListMyReposFn")
-	page := params.GetOptionalInt(req.GetArguments(), "page", 1)
-	pageSize := params.GetOptionalInt(req.GetArguments(), "pageSize", 100)
+	page, pageSize := params.GetPagination(req.GetArguments(), 30)
 	opt := gitea_sdk.ListReposOptions{
 		ListOptions: gitea_sdk.ListOptions{
-			Page:     int(page),
-			PageSize: int(pageSize),
+			Page:     page,
+			PageSize: pageSize,
 		},
 	}
 	client, err := gitea.ClientFromContext(ctx)
@@ -209,5 +209,5 @@ func ListMyReposFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolR
 		return to.ErrorResult(fmt.Errorf("list my repositories error: %v", err))
 	}
 
-	return to.TextResult(repos)
+	return to.TextResult(slimRepos(repos))
 }

operation/repo/slim.go

@@ -0,0 +1,201 @@
+package repo
+
+import (
+	gitea_sdk "code.gitea.io/sdk/gitea"
+)
+
+func userLogin(u *gitea_sdk.User) string {
+	if u == nil {
+		return ""
+	}
+	return u.UserName
+}
+
+func slimRepo(r *gitea_sdk.Repository) map[string]any {
+	if r == nil {
+		return nil
+	}
+	m := map[string]any{
+		"id":                r.ID,
+		"full_name":         r.FullName,
+		"description":       r.Description,
+		"html_url":          r.HTMLURL,
+		"clone_url":         r.CloneURL,
+		"ssh_url":           r.SSHURL,
+		"default_branch":    r.DefaultBranch,
+		"private":           r.Private,
+		"fork":              r.Fork,
+		"archived":          r.Archived,
+		"language":          r.Language,
+		"stars_count":       r.Stars,
+		"forks_count":       r.Forks,
+		"open_issues_count": r.OpenIssues,
+		"open_pr_counter":   r.OpenPulls,
+		"created_at":        r.Created,
+		"updated_at":        r.Updated,
+	}
+	if r.Owner != nil {
+		m["owner"] = r.Owner.UserName
+	}
+	if len(r.Topics) > 0 {
+		m["topics"] = r.Topics
+	}
+	return m
+}
+
+func slimRepos(repos []*gitea_sdk.Repository) []map[string]any {
+	out := make([]map[string]any, 0, len(repos))
+	for _, r := range repos {
+		out = append(out, slimRepo(r))
+	}
+	return out
+}
+
+func slimBranch(b *gitea_sdk.Branch) map[string]any {
+	if b == nil {
+		return nil
+	}
+	m := map[string]any{
+		"name":      b.Name,
+		"protected": b.Protected,
+	}
+	if b.Commit != nil {
+		m["commit_sha"] = b.Commit.ID
+	}
+	return m
+}
+
+func slimBranches(branches []*gitea_sdk.Branch) []map[string]any {
+	out := make([]map[string]any, 0, len(branches))
+	for _, b := range branches {
+		out = append(out, slimBranch(b))
+	}
+	return out
+}
+
+func slimCommit(c *gitea_sdk.Commit) map[string]any {
+	if c == nil {
+		return nil
+	}
+	m := map[string]any{
+		"sha":      c.SHA,
+		"html_url": c.HTMLURL,
+		"created":  c.Created,
+	}
+	if c.RepoCommit != nil {
+		m["message"] = c.RepoCommit.Message
+		if c.RepoCommit.Author != nil {
+			m["author"] = map[string]any{
+				"name":  c.RepoCommit.Author.Name,
+				"email": c.RepoCommit.Author.Email,
+				"date":  c.RepoCommit.Author.Date,
+			}
+		}
+	}
+	return m
+}
+
+func slimCommits(commits []*gitea_sdk.Commit) []map[string]any {
+	out := make([]map[string]any, 0, len(commits))
+	for _, c := range commits {
+		out = append(out, slimCommit(c))
+	}
+	return out
+}
+
+func slimTag(t *gitea_sdk.Tag) map[string]any {
+	if t == nil {
+		return nil
+	}
+	m := map[string]any{
+		"name":    t.Name,
+		"message": t.Message,
+	}
+	if t.Commit != nil {
+		m["commit_sha"] = t.Commit.SHA
+	}
+	return m
+}
+
+func slimTags(tags []*gitea_sdk.Tag) []map[string]any {
+	out := make([]map[string]any, 0, len(tags))
+	for _, t := range tags {
+		m := map[string]any{
+			"name": t.Name,
+		}
+		if t.Commit != nil {
+			m["commit_sha"] = t.Commit.SHA
+		}
+		out = append(out, m)
+	}
+	return out
+}
+
+func slimRelease(r *gitea_sdk.Release) map[string]any {
+	if r == nil {
+		return nil
+	}
+	return map[string]any{
+		"id":           r.ID,
+		"tag_name":     r.TagName,
+		"target":       r.Target,
+		"title":        r.Title,
+		"body":         r.Note,
+		"draft":        r.IsDraft,
+		"prerelease":   r.IsPrerelease,
+		"html_url":     r.HTMLURL,
+		"author":       userLogin(r.Publisher),
+		"created_at":   r.CreatedAt,
+		"published_at": r.PublishedAt,
+	}
+}
+
+func slimReleases(releases []*gitea_sdk.Release) []map[string]any {
+	out := make([]map[string]any, 0, len(releases))
+	for _, r := range releases {
+		out = append(out, slimRelease(r))
+	}
+	return out
+}
+
+func slimContents(c *gitea_sdk.ContentsResponse) map[string]any {
+	if c == nil {
+		return nil
+	}
+	m := map[string]any{
+		"name": c.Name,
+		"path": c.Path,
+		"sha":  c.SHA,
+		"type": c.Type,
+		"size": c.Size,
+	}
+	if c.Content != nil {
+		m["content"] = *c.Content
+	}
+	if c.Encoding != nil {
+		m["encoding"] = *c.Encoding
+	}
+	if c.HTMLURL != nil {
+		m["html_url"] = *c.HTMLURL
+	}
+	if c.DownloadURL != nil {
+		m["download_url"] = *c.DownloadURL
+	}
+	return m
+}
+
+func slimDirEntries(entries []*gitea_sdk.ContentsResponse) []map[string]any {
+	out := make([]map[string]any, 0, len(entries))
+	for _, c := range entries {
+		if c == nil {
+			continue
+		}
+		out = append(out, map[string]any{
+			"name": c.Name,
+			"path": c.Path,
+			"type": c.Type,
+			"size": c.Size,
+		})
+	}
+	return out
+}

operation/repo/slim_test.go

@@ -0,0 +1,142 @@
+package repo
+
+import (
+	"testing"
+
+	gitea_sdk "code.gitea.io/sdk/gitea"
+)
+
+func TestSlimRepo(t *testing.T) {
+	r := &gitea_sdk.Repository{
+		ID:            1,
+		FullName:      "org/repo",
+		Description:   "A test repo",
+		HTMLURL:       "https://gitea.com/org/repo",
+		CloneURL:      "https://gitea.com/org/repo.git",
+		SSHURL:        "git@gitea.com:org/repo.git",
+		DefaultBranch: "main",
+		Private:       false,
+		Fork:          false,
+		Archived:      false,
+		Language:      "Go",
+		Stars:         10,
+		Forks:         2,
+		Owner:         &gitea_sdk.User{UserName: "org"},
+		Topics:        []string{"mcp", "gitea"},
+	}
+
+	m := slimRepo(r)
+
+	if m["full_name"] != "org/repo" {
+		t.Errorf("expected full_name org/repo, got %v", m["full_name"])
+	}
+	if m["owner"] != "org" {
+		t.Errorf("expected owner org, got %v", m["owner"])
+	}
+	topics := m["topics"].([]string)
+	if len(topics) != 2 {
+		t.Errorf("expected 2 topics, got %d", len(topics))
+	}
+}
+
+func TestSlimTag(t *testing.T) {
+	tag := &gitea_sdk.Tag{
+		Name:    "v1.0.0",
+		Message: "Release v1.0.0",
+		Commit:  &gitea_sdk.CommitMeta{SHA: "abc123"},
+	}
+
+	m := slimTag(tag)
+	if m["name"] != "v1.0.0" {
+		t.Errorf("expected name v1.0.0, got %v", m["name"])
+	}
+	if m["message"] != "Release v1.0.0" {
+		t.Errorf("expected message, got %v", m["message"])
+	}
+
+	// List variant omits message
+	list := slimTags([]*gitea_sdk.Tag{tag})
+	if _, ok := list[0]["message"]; ok {
+		t.Error("Tags list should omit message")
+	}
+	if list[0]["name"] != "v1.0.0" {
+		t.Errorf("expected name in list, got %v", list[0]["name"])
+	}
+}
+
+func TestSlimRelease(t *testing.T) {
+	r := &gitea_sdk.Release{
+		ID:        1,
+		TagName:   "v1.0.0",
+		Title:     "First Release",
+		Note:      "Release notes",
+		IsDraft:   false,
+		Publisher: &gitea_sdk.User{UserName: "alice"},
+	}
+
+	m := slimRelease(r)
+	if m["tag_name"] != "v1.0.0" {
+		t.Errorf("expected tag_name v1.0.0, got %v", m["tag_name"])
+	}
+	if m["body"] != "Release notes" {
+		t.Errorf("expected body from Note field, got %v", m["body"])
+	}
+	if m["author"] != "alice" {
+		t.Errorf("expected author alice, got %v", m["author"])
+	}
+}
+
+func TestSlimContents(t *testing.T) {
+	content := "package main"
+	encoding := "base64"
+	htmlURL := "https://gitea.com/org/repo/src/branch/main/main.go"
+	c := &gitea_sdk.ContentsResponse{
+		Name:     "main.go",
+		Path:     "main.go",
+		SHA:      "abc123",
+		Type:     "file",
+		Size:     12,
+		Content:  &content,
+		Encoding: &encoding,
+		HTMLURL:  &htmlURL,
+	}
+
+	m := slimContents(c)
+	if m["name"] != "main.go" {
+		t.Errorf("expected name main.go, got %v", m["name"])
+	}
+	if m["content"] != "package main" {
+		t.Errorf("expected content, got %v", m["content"])
+	}
+}
+
+func TestSlimDirEntries(t *testing.T) {
+	entries := []*gitea_sdk.ContentsResponse{
+		{Name: "src", Path: "src", Type: "dir", Size: 0},
+		{Name: "main.go", Path: "main.go", Type: "file", Size: 100},
+	}
+
+	result := slimDirEntries(entries)
+	if len(result) != 2 {
+		t.Fatalf("expected 2 entries, got %d", len(result))
+	}
+	if result[0]["name"] != "src" {
+		t.Errorf("expected first entry name src, got %v", result[0]["name"])
+	}
+	// Dir entries should not have content
+	if _, ok := result[0]["content"]; ok {
+		t.Error("dir entries should not have content field")
+	}
+}
+
+func TestSlimTags_Nil(t *testing.T) {
+	if r := slimTags(nil); len(r) != 0 {
+		t.Errorf("expected empty slice, got %v", r)
+	}
+}
+
+func TestSlimReleases_Nil(t *testing.T) {
+	if r := slimReleases(nil); len(r) != 0 {
+		t.Errorf("expected empty slice, got %v", r)
+	}
+}

operation/repo/tag.go

@@ -2,7 +2,6 @@ package repo
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"gitea.com/gitea/gitea-mcp/pkg/gitea"
@@ -78,31 +77,23 @@ func init() {
 	})
 }
 
-// To avoid return too many tokens, we need to provide at least information as possible
-// llm can call get tag to get more information
-type ListTagResult struct {
-	ID     string                `json:"id"`
-	Name   string                `json:"name"`
-	Commit *gitea_sdk.CommitMeta `json:"commit"`
-	// message may be a long text, so we should not provide it here
-}
-
 func CreateTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called CreateTagFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	tagName, ok := req.GetArguments()["tag_name"].(string)
-	if !ok {
-		return nil, errors.New("tag_name is required")
+	tagName, err := params.GetString(args, "tag_name")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	target, _ := req.GetArguments()["target"].(string)
-	message, _ := req.GetArguments()["message"].(string)
+	target, _ := args["target"].(string)
+	message, _ := args["message"].(string)
 
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -122,17 +113,18 @@ func CreateTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRes
 
 func DeleteTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called DeleteTagFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	tagName, ok := req.GetArguments()["tag_name"].(string)
-	if !ok {
-		return nil, errors.New("tag_name is required")
+	tagName, err := params.GetString(args, "tag_name")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 
 	client, err := gitea.ClientFromContext(ctx)
@@ -149,17 +141,18 @@ func DeleteTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolRes
 
 func GetTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called GetTagFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	tagName, ok := req.GetArguments()["tag_name"].(string)
-	if !ok {
-		return nil, errors.New("tag_name is required")
+	tagName, err := params.GetString(args, "tag_name")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
 
 	client, err := gitea.ClientFromContext(ctx)
@@ -171,21 +164,22 @@ func GetTagFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult
 		return nil, fmt.Errorf("get tag error: %v", err)
 	}
 
-	return to.TextResult(tag)
+	return to.TextResult(slimTag(tag))
 }
 
 func ListTagsFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
 	log.Debugf("Called ListTagsFn")
-	owner, ok := req.GetArguments()["owner"].(string)
-	if !ok {
-		return nil, errors.New("owner is required")
+	args := req.GetArguments()
+	owner, err := params.GetString(args, "owner")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	repo, ok := req.GetArguments()["repo"].(string)
-	if !ok {
-		return nil, errors.New("repo is required")
+	repo, err := params.GetString(args, "repo")
+	if err != nil {
+		return to.ErrorResult(err)
 	}
-	page := params.GetOptionalInt(req.GetArguments(), "page", 1)
-	pageSize := params.GetOptionalInt(req.GetArguments(), "pageSize", 20)
+	page := params.GetOptionalInt(args, "page", 1)
+	pageSize := params.GetOptionalInt(args, "pageSize", 20)
 
 	client, err := gitea.ClientFromContext(ctx)
 	if err != nil {
@@ -201,13 +195,5 @@ func ListTagsFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResu
 		return nil, fmt.Errorf("list tags error: %v", err)
 	}
 
-	results := make([]ListTagResult, 0, len(tags))
-	for _, tag := range tags {
-		results = append(results, ListTagResult{
-			ID:     tag.ID,
-			Name:   tag.Name,
-			Commit: tag.Commit,
-		})
-	}
-	return to.TextResult(results)
+	return to.TextResult(slimTags(tags))
 }