What does Bazel MCP Server do that the regular Bazel CLI cannot?
It provides an MCP-compatible interface so that AI agents can interact with Bazel even when the invoked shell is misconfigured or lacks the Bazel command-line tool.
Bazel MCP Server
@nacgarg
基本信息
关于 Bazel MCP Server
MCP server for Bazel
Bazel MCP Server 配置
使用下面的配置,将此服务器添加到你的 MCP 客户端。
{
"mcpServers": {
"bazel-mcp-server": {
"command": "npx",
"args": [
"-y",
"github:nacgarg/bazel-mcp-server"
]
}
}
}Bazel MCP Server 工具
6Build specified Bazel targets
Query the dependency graph for targets matching a pattern
Run tests for specified targets
List all available targets in the workspace (requires path parameter, use "//" for all targets)
Fetch external dependencies
Change the Bazel workspace path at runtime
概览
What is Bazel MCP Server?
Bazel MCP Server is a local MCP server that exposes functionality of the Bazel build system to MCP-enabled AI agents. It is useful when MCP environments lack a command-line tool or have a misconfigured shell that prevents Bazel from being used.
How to use Bazel MCP Server?
Install by adding a configuration entry to .cursor/mcp.json (for Cursor) or launching standalone with npx -y github:nacgarg/bazel-mcp-server. Configuration can be provided via CLI arguments, environment variables, or a configuration file. The AI agent can change the workspace path at runtime using the bazel_set_workspace_path tool.
Key features of Bazel MCP Server
- Build specified Bazel targets
- Query the dependency graph for matching targets
- Run tests for specified targets
- List all available targets in the workspace
- Fetch external dependencies
- Change the Bazel workspace path at runtime
- Pass additional arguments to underlying Bazel commands
Use cases of Bazel MCP Server
- Build specific targets from an AI agent without a working shell
- Query the Bazel dependency graph to understand target relationships
- Run tests and view results through the agent
- List all targets in a workspace to explore available build rules
- Fetch external dependencies before building or testing
常见问题
What are the runtime dependencies?
The server requires Node.js (to run via `npx`) and the Bazel binary. The path to the Bazel binary can be specified via `--bazel_path` or the `MCP_BAZEL_PATH` environment variable.
How do I set the Bazel workspace path?
The workspace path can be set at startup via the `--workspace_path` CLI argument, the `MCP_WORKSPACE_PATH` environment variable, or a configuration file. At runtime, the AI agent can use the `bazel_set_workspace_path` tool to change it.
Does the server work with Cursor Remote SSH sessions?
No, the server runs locally and will not work when using Cursor with Remote SSH sessions.
Can I pass extra flags to Bazel commands?
Yes, each tool (except `bazel_set_workspace_path`) accepts an optional `additionalArgs` parameter to supply extra flags like `--verbose_failures` or `--test_output=all`.
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