A **hosted version** of the LangSmith MCP Server is available over HTTP-streamable transport, so you can connect without running the server yourself:
Langsmith MCP server is a hosted integration for AI assistants that speak the Model Context Protocol. A hosted version of the LangSmith MCP Server is available over HTTP-streamable transport, so you can connect without running the server yourself:.
Once Langsmith is connected, these are the calls the assistant has available:
get_billing_usage — Fetch organization billing usage (e.g. trace counts) for a date range. Optional workspace filter; returns metrics with workspace names inlinePrerequisites — The Prerequisites tool exposed by this serverSetup — uv sync # Install dependencies uv sync --group test # Include test dependencies (pytest, ruff, mypy)Being a remote server, there is no local install. You register the endpoint with your client, authorise it once, and the tools appear.
You will need 5 environment variables: LANGSMITH_API_KEY, LANGSMITH_WORKSPACE_ID, LANGSMITH_ENDPOINT, LANGSMITH_MONITORING_API_KEY, LANGSMITH_MONITORING_WORKSPACE_ID. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
curl -LsSf https://astral.sh/uv/install.sh | sh - LangSmith API key – from smith.langchain.com - Node.js (optional) – only if you want to use MCP Inspector to test the server (stdio or streamable-http)Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Langsmith's toolset — get_billing_usage, Prerequisites, Setup — is a fair guide to whether it matches your workflow. It is maintained by langchain-ai; worth a glance at recent repository activity before you build anything load-bearing on it.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
| Tool | What it does |
|---|---|
| get_billing_usage | Fetch organization billing usage (e.g. trace counts) for a date range. Optional workspace filter; returns metrics with workspace names inline. |
| Prerequisites | The Prerequisites tool exposed by this server. |
| Setup | uv sync # Install dependencies uv sync --group test # Include test dependencies (pytest, ruff, mypy) |
{
"mcpServers": {
"LangSmith MCP (Hosted)": {
"url": "https://langsmith-mcp-server.onrender.com/mcp",
"headers": {
"LANGSMITH-API-KEY": "lsv2_pt_your_api_key_here"
}
}
}
}Configuration as documented by the project. Restart the client after saving.
curl -LsSf https://astral.sh/uv/install.sh | sh - LangSmith API key – from smith.langchain.com - Node.js (optional) – only if you want to use MCP Inspector to test the server (stdio or streamable-http)| Variable | Description | Required |
|---|---|---|
| LANGSMITH_API_KEY | Credential the server authenticates with. | Yes |
| LANGSMITH_WORKSPACE_ID | Configuration value read at startup. | Optional |
| LANGSMITH_ENDPOINT | Configuration value read at startup. | Optional |
| LANGSMITH_MONITORING_API_KEY | Credential the server authenticates with. | Yes |
| LANGSMITH_MONITORING_WORKSPACE_ID | Configuration value read at startup. | Optional |
Kill hallucinated APIs — version-accurate, up-to-date library documentation injected straight into context.
Microsoft's official browser automation server — drive a real browser through the accessibility tree, no screenshots needed.
GitHub's official server — repos, issues, pull requests, Actions and code security, straight from your assistant.
Issue tracking at the speed of conversation — Linear's official hosted server with OAuth and zero install.
Local repository surgery — status, diffs, commits, branches and history for any repo on disk.
Timezone sanity for AI — current time anywhere and correct conversions, without the model doing date math.