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GitLab MCP Integration for LangChain

Connect GitLab to LangChain through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

20 functions 13 read 7 write API token auth
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Connect GitLab to LangChain

Bridge LangChain agents to local KosmoKrator integration tools through MCP or headless CLI calls.

Use the MCP gateway when the agent should discover tools, or wrap kosmo integrations:call for fixed chains. The gateway is local, scoped to this integration, and starts with --write=deny so LangChain can inspect read-capable tools without receiving write access by default.

GitLab MCP Config for LangChain

Keep the gateway scoped to the integration and operation class needed by the chain.

{
  "mcpServers": {
    "kosmokrator-gitlab": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=gitlab",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=gitlab --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only GitLab instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

GitLab Tools Visible to LangChain

LangChain sees stable MCP tool names generated from the GitLab integration catalog.

MCP toolSource functionTypeDescription
integration__gitlab__gitlab_create_issue gitlab.gitlab_create_issue Write Create a new issue in a GitLab project. Requires a project ID and title. Optionally set description, labels, assignees, milestone, and weight.
integration__gitlab__gitlab_get_issue gitlab.gitlab_get_issue Read Get detailed information about a specific GitLab issue, including title, description, labels, assignees, milestone, and state.
integration__gitlab__gitlab_update_issue gitlab.gitlab_update_issue Write Update an existing issue in a GitLab project. Can change title, description, labels, state (close/reopen), and assignees.
integration__gitlab__gitlab_list_issues gitlab.gitlab_list_issues Read List issues in a GitLab project. Supports filtering by state (opened, closed, all), labels, and search text. Paginated.
integration__gitlab__gitlab_search_issues gitlab.gitlab_search_issues Read Search for issues in a GitLab project by keyword. Searches issue titles and descriptions. Optionally filter by state.
integration__gitlab__gitlab_create_issue_comment gitlab.gitlab_create_issue_comment Write Add a comment (note) to a GitLab issue. The comment body supports GitLab Markdown.
integration__gitlab__gitlab_create_merge_request gitlab.gitlab_create_merge_request Write Create a new merge request in a GitLab project. Requires source branch, target branch, and title.
integration__gitlab__gitlab_get_merge_request gitlab.gitlab_get_merge_request Read Get detailed information about a specific GitLab merge request, including title, description, source/target branches, and state.
integration__gitlab__gitlab_list_merge_requests gitlab.gitlab_list_merge_requests Read List merge requests in a GitLab project. Supports filtering by state (opened, closed, merged, all). Paginated.
integration__gitlab__gitlab_update_merge_request gitlab.gitlab_update_merge_request Write Update an existing merge request in a GitLab project. Can change title, description, labels, and state (close/reopen).
integration__gitlab__gitlab_accept_merge_request gitlab.gitlab_accept_merge_request Write Accept (merge) a GitLab merge request. Optionally set a custom merge commit message.
integration__gitlab__gitlab_list_branches gitlab.gitlab_list_branches Read List branches in a GitLab project repository. Supports searching by branch name and pagination.
integration__gitlab__gitlab_create_branch gitlab.gitlab_create_branch Write Create a new branch in a GitLab project repository. Requires a branch name and a ref (branch name or commit SHA) to create from.
integration__gitlab__gitlab_list_commits gitlab.gitlab_list_commits Read List commits in a GitLab project repository. Supports filtering by branch or tag name. Paginated.
integration__gitlab__gitlab_get_file gitlab.gitlab_get_file Read Get a file from a GitLab project repository. Returns file content (base64-encoded), file name, size, and encoding.
integration__gitlab__gitlab_list_projects gitlab.gitlab_list_projects Read List GitLab projects visible to the authenticated user. Supports filtering by membership, search text, and pagination.
integration__gitlab__gitlab_get_project gitlab.gitlab_get_project Read Get details for a specific GitLab project, including name, description, default branch, visibility, and statistics.
integration__gitlab__gitlab_list_groups gitlab.gitlab_list_groups Read List GitLab groups visible to the authenticated user. Paginated.
integration__gitlab__gitlab_list_project_members gitlab.gitlab_list_project_members Read List members of a GitLab project and their access levels. Paginated.
integration__gitlab__gitlab_list_labels gitlab.gitlab_list_labels Read List all labels for a GitLab project, including name, color, description, and open/closed issue counts.

Related GitLab Pages

GitLab CLIUse direct JSON commands instead of MCP discovery. GitLab MCPFull gateway reference and MCP tool names. KosmoKrator for LangChainClient-level gateway setup.