API gap coverage: 40 missing GitLab API endpoints

[vish288]

Summary

Gap analysis against GitLab REST API v4 identified 40 tools worth adding across 3 priority tiers. Current tool count: 76.

HIGH Priority (14 tools)

These are blocking for common AI assistant workflows:

#	Gap	API Endpoint	Tools to Add
1	Approve/Unapprove MR	POST .../approve, POST .../unapprove	gitlab_approve_mr, gitlab_unapprove_mr
2	Current user	GET /user	gitlab_get_current_user
3	Search users	GET /users?search=	gitlab_search_users
4	Read repository file	GET .../repository/files/:path/raw	gitlab_get_file
5	File blame	GET .../repository/files/:path/blame	gitlab_get_file_blame
6	List repository tree	GET .../repository/tree	gitlab_list_repository_tree
7	Project/group members	GET .../members, POST, DELETE	gitlab_list_members, gitlab_add_member, gitlab_remove_member
8	Protected branches	GET/POST/PATCH/DELETE .../protected_branches	gitlab_list_protected_branches, gitlab_protect_branch, gitlab_unprotect_branch
9	Code search	GET /search?scope=blobs	gitlab_search_code

Why these matter:

• Cannot complete a review workflow without approve/unapprove (rules exist but not the action)
• Cannot inspect files remotely without read file/tree (can write via commits but can't read)
• Cannot find reviewers or check access without user/member tools

MEDIUM Priority (14 tools)

#	Gap	Tools to Add
10	Environments	gitlab_list_environments, gitlab_stop_environment
11	Deployments	gitlab_list_deployments, gitlab_get_deployment
12	Pipeline schedules	gitlab_list_pipeline_schedules, gitlab_create_pipeline_schedule, gitlab_play_pipeline_schedule
13	Labels	gitlab_list_labels, gitlab_create_label
14	CI lint	gitlab_ci_lint
15	Todos	gitlab_list_todos, gitlab_mark_todo_done
16	Draft notes (batch review)	gitlab_create_draft_note, gitlab_publish_draft_notes
17	Milestones	gitlab_list_milestones, gitlab_create_milestone
18	Repository contributors	gitlab_list_contributors
19	Merge base	gitlab_get_merge_base

LOW Priority (12 tools)

#	Gap	Tools to Add
20	Webhooks	gitlab_list_webhooks, gitlab_create_webhook
21	Wikis	gitlab_list_wiki_pages, gitlab_get_wiki_page
22	Runners	gitlab_list_runners
23	Snippets	gitlab_list_snippets
24	Events/activity	gitlab_list_events
25	Merge trains	gitlab_list_merge_trains
26	Container registry	gitlab_list_registry_repos
27	Packages	gitlab_list_packages
28	Protected tags	gitlab_list_protected_tags

Implementation Notes

• All new tools should follow existing patterns: @mcp.tool() decorator, _ok()/_err() return wrappers, _check_write() for mutations, proper readOnlyHint/destructiveHint annotations
• URL parsing via _helpers.py parsers where applicable
• Tests: unit tests with httpx mock, matching existing coverage patterns