feat: Gitlab list repository tree tool

[BobMerkus]

This PR adds a list_repository_tree tool for the Gitlab MCP, so AI agents can explore repositories interactively.
Originally created this PR inside the official gitlab integration, but they are not the fastest so I have decided to submit it here as well.

Description

This PR adds a list_repository_tree tool for the Gitlab MCP, so It can explore a repository interactively. It wraps around the corresponding List repository tree.

Motivation and Context

The AI agents are in the dark regarding the structure of a repository and can only read specific files in their entirety. This PR adds the list_repository_tree to allow the AI to explore the repository before reading/updating specific files.

Additional context

See List repository tree - Gitlab Documentation.

Get a list of repository files and directories in a project. This endpoint can be accessed without authentication if the repository is publicly accessible.

This command provides essentially the same features as the git ls-tree command. For more information, refer to the section Tree Objects in the Git internals documentation.

Attribute	Type	Required	Description
id	integer or string	yes	The ID or URL-encoded path of the project.
page_token	string	no	The tree record ID at which to fetch the next page. Used only with keyset pagination.
pagination	string	no	If keyset, use the keyset-based pagination method.
path	string	no	The path inside the repository. Used to get content of subdirectories.
per_page	integer	no	Number of results to show per page. If not specified, defaults to 20. For more information, see Pagination.
recursive	boolean	no	Boolean value used to get a recursive tree. Default is false.
ref	string	no	The name of a repository branch or tag or, if not given, the default branch.

[bbang-dduck]

great...!

[bbang-dduck]

Published thx

https://github.com/zereight/gitlab-mcp/releases/tag/v1.0.34