How to Use the LangSmith MCP in Cline

Give Cline direct access to the LangSmith MCP Server so it can hunt down failing LLM traces and write the fix inside VS Code.

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Connect LangSmith MCP to Cline

Create your Vinkius account to connect LangSmith to Cline and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup LangSmith with Cline

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Pull Project Metrics into VS Code

The `langsmith_list_projects` tool exposes your entire observability stack to your local agent. Cline uses this to fetch run counts, median latency, and user feedback scores across your environments. You tell Cline to audit your LLM performance. It grabs the project data, identifies the deployment with the worst latency, and drafts a markdown report with the exact metrics right in your workspace.

Audit Recent Executions Automatically

The `langsmith_list_runs` tool lets Cline pull execution logs for any specific project. It retrieves run types, success statuses, token consumption, and execution timing. Just ask Cline to investigate when a user reports a weird AI response. The agent queries the recent runs, finds the specific execution that hallucinated, and shows you the exact prompt sequence that triggered it.

Fix Broken MCP Server Traces Fast

The `langsmith_get_run` tool retrieves the raw data of a single execution using its trace ID. Cline reads the granular inputs, outputs, and chain logic of that exact moment in time. This is where end-to-end execution shines. The agent reads the broken trace, identifies the malformed JSON output from your model, and immediately edits your parsing logic in VS Code to handle the edge case.

Setup guide

Set up LangSmith MCP in Cline

Prerequisites

VS Code with Cline extension installed
Active Vinkius subscription with a valid endpoint token

1

Open Cline MCP settings

Click the Cline icon in the VS Code sidebar to open the Cline panel. Then click the MCP Servers icon (server stack) at the top-right corner of the panel.
2

Add a remote server

Click "Remote Servers" at the top, then click "Add Remote MCP". In the Name field, type langsmith-mcp. In the URL field, paste your Vinkius endpoint: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp. Get your token from cloud.vinkius.com.
3

Enable the server

After saving, the server appears in the Cline MCP panel. Toggle the switch to enable it. The status indicator turns green when the connection is live.
4

Start using tools

Return to the Cline chat and ask: "Check my latest LangSmith refund status." Cline will discover the available tools and request your approval before invoking each one — giving you full control over every action.

Cline MCP Settings

{
  "mcpServers": {
    "langsmith-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by LangSmith. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about LangSmith MCP in Cline

Open the Cline sidebar and click the MCP Servers icon. You can use the Remote Servers tab to add your endpoint URL, or edit `cline_mcp_settings.json` directly to pick up the tools instantly.

Yes. The list runs tool returns token usage for every LLM call. Cline aggregates these numbers to show you exactly which prompt is draining your API budget.

It writes the code, but you review the diff. Once it pulls the failed trace data, it stages a commit with the proposed fix for your approval.

Just paste the trace ID into the chat. Cline executes the get run tool, reads the inputs and outputs, and explains exactly why the execution failed.

Your raw prompt text, model outputs, and metadata are processed through a zero-trust architecture. The Vinkius managed endpoint uses a single token for auth, ensuring your trace payloads never leak into persistent storage.

Use it with your favorite AI tools

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