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Pare Cargo

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Structured Rust cargo operations, optimized for AI agents

How to install ↓ Compare GitHub source repository ↗

Category: Dev Tools #394 of 438
Stars: ★ 138 Popular
Transport: stdio (local process)
Runtime: Node.js 20+
Credentials: No credential needed
License: MIT
Last commit: 53 days ago
Tools: 5

Static review · not runListed 2026-08-07

FMRS 34/100 · D · Weakest Reliability 4/20 — Read the FMRS scoring method →

Fit and risk

What it can accessReads local filesWrites / deletes local filesRuns commands or code

Best for

Developers using Rust and Cargo
Scenarios requiring stable structured output for automation or AI integration
Agent workflows aiming to minimize token usage

Not for

Projects not using Rust or Cargo
Scenarios needing raw terminal output directly
Simple tasks without the need for structure and unfamiliarity with Rust toolchain

Required permissions

Execute Cargo commands (e.g., build, test, clippy, fmt, doc)
Access project directories to read configurations and source code
May create build artifacts (e.g., target directory)

Risks and side effects

Cargo command execution may alter project state (e.g., generate files or modify lock files)
Tool outputs may contain sensitive information; handle with care
Dependency on Node.js environment and network (via npx package fetch)

Setup

Before you start

Runtime：Node.js 20+

Other optional settings (1)

PARE_TOOLS optional Universal tool filter in server:tool,... format (e.g. git:status,npm:install) limiting tools across all Pare servers; not required.

Ensure Node.js >= 20 is installed.\n2. Add the following to your MCP client configuration (e.g., Claude Desktop or Cursor):\n\n{\n \"mcpServers\": {\n \"pare-cargo\": {\n \"command\": \"npx\",\n \"args\": [\"-y\", \"@paretools/cargo\"]\n }\n }\n}\n\n3. Restart your MCP client to apply the configuration.\n4. Optional: Run npx @paretools/init doctor to validate setup.

claude_desktop_config.json

{
  "mcpServers": {
    "pare-cargo": {
      "command": "npx",
      "args": [
        "-y",
        "@paretools/cargo"
      ],
      "env": {}
    }
  }
}

Shown for Claude Desktop. Other clients may use a different file or key (VS Code uses "servers") — the configurator below converts it.

.vscode/mcp.json

{
  "servers": {
    "pare-cargo": {
      "command": "npx",
      "args": [
        "-y",
        "@paretools/cargo"
      ],
      "env": {}
    }
  }
}

Goes in your project's .vscode/mcp.json (VS Code uses a "servers" key).

Terminal

claude mcp add pare-cargo -- npx -y @paretools/cargo

Run it in a terminal; replace any <…> placeholders with your own values first.

Generate and validate client config

Check that it works

After connecting, check that pare-cargo's tools (cargo build, cargo test, cargo clippy, cargo fmt, cargo doc) appear in the client's tool list, or simply ask it to run cargo build — a structured JSON result proves the connection works.

Troubleshooting

Ensure Node.js >= 20 to avoid version errors
If npx not found, use absolute path or install globally
If slow startup, run `npx -y @paretools/cargo` to pre-cache
If connection timeout, increase MCP_TIMEOUT environment variable
If too many tools, use PARE_CARGO_TOOLS environment variable to filter

Things to try

Once connected, you can ask your AI assistant things like:

Build the current Rust project with cargo and summarize any compile errors as JSON
Run this crate's tests and tell me which cases failed
Run cargo clippy on the project and list all lint warnings
Format the Rust code in the src directory

Tools 5

cargo build writes

Executes cargo build and returns structured build results including success/failure status and error lists.

cargo test read-only

Runs cargo test and returns structured test results including counts and pass/fail details.

cargo clippy read-only

Runs clippy linting and returns structured lint reports including warnings and errors.

cargo fmt writes

Runs rustfmt and returns structured formatting status including whether changes were made.

cargo doc writes

Generates Rust documentation and returns structured documentation build status.

Use cases

Allow AI agents to execute build, test, and other operations in Rust projects with structured results

Reduce token consumption especially with verbose build logs

Avoid brittle CLI parsing and ensure cross-platform consistency

Supported clients

Claude Desktop

Claude Code

Cursor

VS Code

Windsurf

Cline

Roo Code

Listed from the project's documentation, not tested by this site.

Overview

Pare Cargo is an MCP server from the Pare suite that wraps common Rust cargo commands (build, test, clippy, fmt, doc) into typed JSON output, replacing fragile terminal text parsing. It leverages MCP's structuredContent and outputSchema features to provide reliable, schema-validated data for AI agents. This server is included in the Pare repository under packages/server-cargo, version 0.22.0, and communicates via stdio.

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Source revision 57e1980e8375 Data synced 2026-10-12 Read the FMRS scoring method