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<!-- -->
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<p>Langflow integrates with the <a href="https://modelcontextprotocol.io/introduction" target="_blank" rel="noopener noreferrer">Model Context Protocol (MCP)</a> as both an MCP server and an MCP client.</p>
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<p>This page describes how to use Langflow as an MCP server.</p>
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<p>For information about using Langflow as an MCP client, see <a href="/mcp-client">Use Langflow as an MCP client</a>.</p>
|
||
<p>As an MCP server, Langflow exposes your flows as <a href="https://modelcontextprotocol.io/docs/concepts/tools" target="_blank" rel="noopener noreferrer">tools</a> that <a href="https://modelcontextprotocol.io/clients" target="_blank" rel="noopener noreferrer">MCP clients</a> can use to take actions.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h2>
|
||
<ul>
|
||
<li>
|
||
<p>A <a href="/concepts-flows#projects">Langflow project</a> with at least one flow.</p>
|
||
</li>
|
||
<li>
|
||
<p>Any LTS version of <a href="https://docs.npmjs.com/downloading-and-installing-node-js-and-npm" target="_blank" rel="noopener noreferrer">Node.js</a> installed on your computer if you want to use MCP Inspector to <a href="#test-and-debug-flows">test and debug flows</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://ngrok.com/docs/getting-started/#1-install-ngrok" target="_blank" rel="noopener noreferrer">ngrok installed</a> and an <a href="https://dashboard.ngrok.com/get-started/your-authtoken" target="_blank" rel="noopener noreferrer">ngrok authtoken</a> if you want to <a href="/deployment-public-server">deploy a public Langflow server</a>.</p>
|
||
</li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="select-flows-to-serve">Select and configure flows to expose as MCP tools<a href="#select-flows-to-serve" class="hash-link" aria-label="Direct link to Select and configure flows to expose as MCP tools" title="Direct link to Select and configure flows to expose as MCP tools"></a></h2>
|
||
<div class="theme-admonition theme-admonition-important admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>MCP flow requirements</div><div class="admonitionContent_BuS1"><p>A flow must contain a <a href="/components-io#chat-output"><strong>Chat Output</strong> component</a> to be used as a tool by MCP clients.</p></div></div>
|
||
<p>Each <a href="/concepts-flows#projects">Langflow project</a> has an MCP server that exposes the project's flows as tools that MCP clients can use to generate responses.</p>
|
||
<p>By default, all flows in a project are exposed as tools on the project's MCP server.</p>
|
||
<p>The following steps explain how to limit the exposed flows and, optionally, rename flows for agentic use:</p>
|
||
<ol>
|
||
<li>
|
||
<p>From the Langflow dashboard, select the project that contains the flows you want to serve as tools, and then click the <strong>MCP Server</strong> tab.
|
||
Alternatively, you can quickly access the <strong>MCP Server</strong> tab from within any flow by selecting <strong>Share > MCP Server</strong>.</p>
|
||
<p>The <strong>Auto install</strong> and <strong>JSON</strong> tabs display options for connecting MCP clients to the project's MCP server.</p>
|
||
<p>The <strong>Flows/Tools</strong> section lists the flows that are currently being served as tools.</p>
|
||
<p><img decoding="async" loading="lazy" alt="MCP server projects page" src="/assets/images/mcp-server-53850e4ac7599dec00dd7d01922ba79f.png" width="4000" height="2174" class="img_ev3q"></p>
|
||
</li>
|
||
<li>
|
||
<p>Click <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-settings2" aria-hidden="true"><path d="M20 7h-9"></path><path d="M14 17H5"></path><circle cx="17" cy="17" r="3"></circle><circle cx="7" cy="7" r="3"></circle></svg> <strong>Edit Tools</strong>.</p>
|
||
</li>
|
||
<li>
|
||
<p>In the <strong>MCP Server Tools</strong> window, select the flows that you want exposed as tools.</p>
|
||
<p><img decoding="async" loading="lazy" alt="MCP Server Tools" src="/assets/images/mcp-server-tools-ddc0f1dc04109b9f3daf6a2f380073c4.png" width="4000" height="2030" class="img_ev3q"></p>
|
||
</li>
|
||
<li>
|
||
<p>Recommended: Edit the <strong>Tool Name</strong> and <strong>Tool Description</strong> to help MCP clients determine which actions your flows provide and when to use those actions:</p>
|
||
<ul>
|
||
<li>
|
||
<p><strong>Tool Name</strong>: Enter a name that makes it clear what the flow does when used as a tool by an agent.</p>
|
||
</li>
|
||
<li>
|
||
<p><strong>Tool Description</strong>: Enter a description that accurately describes the specific actions the flow performs.</p>
|
||
</li>
|
||
</ul>
|
||
<details class="details_lb9f alert alert--info details_b_Ee" data-collapsed="true"><summary>Name and describe your flows for agentic use</summary><div><div class="collapsibleContent_i85q"><p>MCP clients use the <strong>Tool Name</strong> and <strong>Tool Description</strong> to determine which action to use.</p><p>MCP clients like <a href="https://www.cursor.com/" target="_blank" rel="noopener noreferrer">Cursor</a> treat your Langflow project as a single MCP server with all of your enabled flows listed as tools.</p><p>This can confuse agents if the flows have unclear names or descriptions.
|
||
For example, a flow's default name is the flow ID, such as <code>adbbf8c7-0a34-493b-90ea-5e8b42f78b66</code>.
|
||
This provides no information to an agent about the type of flow or it's purpose.</p><p>To provide more context about your flows, make sure to name and describe your flows clearly when configuring your Langflow project's MCP server.</p><p>It's helpful to think of the names and descriptions as function names and code comments, using clear statements describing the problems your flows solve.</p><p>For example, assume you create a flow based on the <strong>Document Q&A</strong> template that uses an LLM to chat about resumes, and then you give the flow the following name and description:</p><ul>
|
||
<li>
|
||
<p><strong>Tool Name</strong>: <code>document_qa_for_resume</code></p>
|
||
</li>
|
||
<li>
|
||
<p><strong>Tool Description</strong>: <code>A flow for analyzing Emily's resume.</code></p>
|
||
</li>
|
||
</ul><p>After connecting your Langflow MCP server to Cursor, you can ask Cursor about the resume, such as <code>What job experience does Emily have?</code>.
|
||
Using the context provided by your tool name and description, the agent can decide to use the <code>document_qa_for_resume</code> MCP tool to create a response about Emily's resume.
|
||
If necessary, the agent asks permission to use the flow tool before generating the response.</p><p>If you ask about a different resume, such as <code>What job experience does Alex have?</code>, the agent can decide that <code>document_qa_for_resume</code> isn't relevant to this request, because the tool description specifies that the flow is for Emily's resume.
|
||
In this case, the agent might use another available tool, or it can inform you that it doesn't have access to information about Alex's.
|
||
For example:</p><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>I notice you're asking about Alex's job experience.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>Based on the available tools, I can see there is a Document QA for Resume flow that's designed for analyzing resumes.</span></div></div><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>However, the description mentions it's for "Emily's resume" not Alex's. I don't have access to Alex's resume or job experience information.</span></div></div><br></code></div></div></div></div></details>
|
||
</li>
|
||
<li>
|
||
<p>Close the <strong>MCP Server Tools</strong> window to save your changes.</p>
|
||
</li>
|
||
</ol>
|
||
<!-- -->
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="connect-clients-to-use-the-servers-actions">Connect clients to Langflow's MCP server<a href="#connect-clients-to-use-the-servers-actions" class="hash-link" aria-label="Direct link to Connect clients to Langflow's MCP server" title="Direct link to Connect clients to Langflow's MCP server"></a></h2>
|
||
<p>The following procedure describes how to connect <a href="https://www.cursor.com/" target="_blank" rel="noopener noreferrer">Cursor</a> to your Langflow project's MCP server to consume your flows as tools.
|
||
However, you can connect any <a href="https://modelcontextprotocol.io/clients" target="_blank" rel="noopener noreferrer">MCP-compatible client</a> following similar steps.</p>
|
||
<div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Auto install</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">JSON</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="theme-admonition theme-admonition-important admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>important</div><div class="admonitionContent_BuS1"><p>Auto installation only works if your HTTP client and Langflow server are on the same local machine.
|
||
If this isn't the case, use the <strong>JSON</strong> option to configure the MCP server.</p></div></div><ol>
|
||
<li>Install <a href="https://docs.cursor.com/get-started/installation" target="_blank" rel="noopener noreferrer">Cursor</a>.</li>
|
||
<li>In the Langflow dashboard, select the project that contains the flows you want to serve, and then click the <strong>MCP Server</strong> tab.</li>
|
||
<li>To auto install your current Langflow project as an MCP server, click <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-plus" aria-hidden="True"><path d="M5 12h14"></path><path d="M12 5v14"></path></svg> <strong>Add</strong>.</li>
|
||
</ol><p>The installation adds the server's configuration file to Cursor's <code>mcp.json</code> configuration file.</p></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><ol>
|
||
<li>
|
||
<p>Install <a href="https://docs.cursor.com/get-started/installation" target="_blank" rel="noopener noreferrer">Cursor</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p>In Cursor, go to <strong>Cursor Settings > MCP</strong>, and then click <strong>Add New Global MCP Server</strong>.
|
||
This opens Cursor's global MCP configuration file, <code>mcp.json</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>In the Langflow dashboard, select the project that contains the flows you want to serve, and then click the <strong>MCP Server</strong> tab.</p>
|
||
</li>
|
||
<li>
|
||
<p>Copy the code template from the <strong>JSON</strong> tab, and then paste it into <code>mcp.json</code> in Cursor.
|
||
For example:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "mcpServers": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "PROJECT_NAME": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "command": "uvx",</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "args": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "mcp-proxy",</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse"</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div>
|
||
<p>The <strong>MCP Server</strong> tab automatically includes the correct <code>PROJECT_NAME</code>, <code>LANGFLOW_SERVER_ADDRESS</code>, and <code>PROJECT_ID</code> values.
|
||
The default Langflow server address is <code>http://localhost:7860</code>.</p>
|
||
<p>If you have <a href="/deployment-public-server">deployed a public Langflow server</a>, the address is automatically included.</p>
|
||
<p>If your Langflow server requires authentication, you must include your Langflow API key in the configuration.
|
||
For more information, see <a href="#authentication">MCP server authentication and environment variables</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Save and close the <code>mcp.json</code> file in Cursor.
|
||
The newly added MCP server will appear in the <strong>MCP Servers</strong> section.</p>
|
||
</li>
|
||
</ol></div></div></div>
|
||
<p>Cursor is now connected to your project's MCP server and your flows are registered as tools.
|
||
Cursor determines when to use tools based on your queries, and requests permissions when necessary.
|
||
For more information, see the <a href="https://docs.cursor.com/context/model-context-protocol" target="_blank" rel="noopener noreferrer">Cursor's MCP documentation</a>.</p>
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="authentication">MCP server authentication and environment variables<a href="#authentication" class="hash-link" aria-label="Direct link to MCP server authentication and environment variables" title="Direct link to MCP server authentication and environment variables"></a></h3>
|
||
<p>You must provide a Langflow API key in your MCP client configuration if your <a href="/api-keys-and-authentication#start-a-langflow-server-with-authentication-enabled">Langflow server has authentication enabled</a>.</p>
|
||
<p>When this is the case, the code template in your project's <strong>MCP Server</strong> tab automatically includes the <code>--header</code> and <code>x-api-key</code> arguments:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "mcpServers": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "PROJECT_NAME": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "command": "uvx",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "args": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "mcp-proxy",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "--headers",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "x-api-key",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "YOUR_API_KEY",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse"</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div>
|
||
<p>Click <!-- --> <strong>Generate API key</strong> to automatically insert a new Langflow API key into the code template.
|
||
Alternatively, you can replace <code>YOUR_API_KEY</code> with an existing Langflow API key.</p>
|
||
<p><img decoding="async" loading="lazy" alt="MCP server tab showing Generate API key button" src="/assets/images/mcp-server-api-key-5a39d0de10227381df269c4595d4d896.png" width="4000" height="2188" class="img_ev3q"></p>
|
||
<p>To include other environment variables with your MCP server command, use the <code>env</code> object with key-value pairs of environment variables:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "mcpServers": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "PROJECT_NAME": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "command": "uvx",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "args": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "mcp-proxy",</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse"</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> ],</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "env": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> "KEY": "VALUE"</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->14</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div>
|
||
<!-- -->
|
||
<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="deploy-your-server-externally">Deploy your MCP server externally<a href="#deploy-your-server-externally" class="hash-link" aria-label="Direct link to Deploy your MCP server externally" title="Direct link to Deploy your MCP server externally"></a></h3>
|
||
<p>To deploy your MCP server externally with ngrok, see <a href="/deployment-public-server">Deploy a public Langflow server</a>.</p>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="test-and-debug-flows">Use MCP Inspector to test and debug flows<a href="#test-and-debug-flows" class="hash-link" aria-label="Direct link to Use MCP Inspector to test and debug flows" title="Direct link to Use MCP Inspector to test and debug flows"></a></h2>
|
||
<p><a href="https://modelcontextprotocol.io/docs/tools/inspector" target="_blank" rel="noopener noreferrer">MCP Inspector</a> is a common tool for testing and debugging MCP servers.
|
||
You can use MCP Inspector to monitor your flows and get insights into how they are being consumed by the MCP server:</p>
|
||
<ol>
|
||
<li>
|
||
<p>Install MCP Inspector:</p>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>npx @modelcontextprotocol/inspector</span></div></div><br></code></div></div>
|
||
<p>For more information about configuring MCP Inspector, including specifying a proxy port, see the <a href="https://github.com/modelcontextprotocol/inspector" target="_blank" rel="noopener noreferrer">MCP Inspector GitHub project</a>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Open a web browser and navigate to the MCP Inspector UI.
|
||
The default address is <code>http://localhost:6274</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>In the MCP Inspector UI, enter the connection details for your Langflow project's MCP server:</p>
|
||
<ul>
|
||
<li><strong>Transport Type</strong>: Select <strong>SSE</strong>.</li>
|
||
<li><strong>URL</strong>: Enter the Langflow MCP server's <code>sse</code> endpoint. For example: <code>http://localhost:7860/api/v1/mcp/project/d359cbd4-6fa2-4002-9d53-fa05c645319c/sse</code></li>
|
||
</ul>
|
||
<p>If you've <a href="#authentication">configured authentication for your MCP server</a>, fill out the following additional fields:</p>
|
||
<ul>
|
||
<li><strong>Transport Type</strong>: Select <strong>STDIO</strong>.</li>
|
||
<li><strong>Command</strong>: <code>uvx</code></li>
|
||
<li><strong>Arguments</strong>: Enter the following list of arguments, separated by spaces. Replace the values for <code>YOUR_API_KEY</code>, <code>LANGFLOW_SERVER_ADDRESS</code>, and <code>PROJECT_ID</code> with the values from your Langflow MCP server. For example:</li>
|
||
</ul>
|
||
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>mcp-proxy --headers x-api-key YOUR_API_KEY http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse</span></div></div><br></code></div></div>
|
||
</li>
|
||
<li>
|
||
<p>Click <strong>Connect</strong>.</p>
|
||
<p>If the connection was successful, you should see your project's flows in the <strong>Tools</strong> tab.
|
||
From this tab, you can monitor how your flows are being registered as tools by MCP, as well as test the tools with custom input values.</p>
|
||
</li>
|
||
<li>
|
||
<p>To quit MCP Inspector, press <kbd>Control+C</kbd> in the same terminal window where you started it.</p>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="troubleshooting-mcp-server">Troubleshooting MCP server<a href="#troubleshooting-mcp-server" class="hash-link" aria-label="Direct link to Troubleshooting MCP server" title="Direct link to Troubleshooting MCP server"></a></h2>
|
||
<p>If Claude for Desktop isn't using your server's tools correctly, you may need to explicitly define the path to your local <code>uvx</code> or <code>npx</code> executable file in the <code>claude_desktop_config.json</code> configuration file.</p>
|
||
<ol>
|
||
<li>
|
||
<p>To find your UVX path, run <code>which uvx</code>.</p>
|
||
<p>To find your NPX path, run <code>which npx</code>.</p>
|
||
</li>
|
||
<li>
|
||
<p>Copy the path, and then replace <code>PATH_TO_UVX</code> or <code>PATH_TO_NPX</code> in your <code>claude_desktop_config.json</code> file.</p>
|
||
<div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">uvx</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">npx</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "mcpServers": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "PROJECT_NAME": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "command": "PATH_TO_UVX",</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "args": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "mcp-proxy",</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse"</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->11</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div><div role="tabpanel" class="tabItem_Ymn6" hidden=""><div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>{</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "mcpServers": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "PROJECT_NAME": {</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "command": "PATH_TO_NPX",</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "args": [</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "-y",</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "supergateway",</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "--sse",</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> "http://LANGFLOW_SERVER_ADDRESS/api/v1/mcp/project/PROJECT_ID/sse"</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> ]</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span> }</span></div></div><div><span class="ch-code-line-number">_<!-- -->13</span><div style="display:inline-block;margin-left:16px"><span>}</span></div></div><br></code></div></div></div></div></div>
|
||
</li>
|
||
</ol>
|
||
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="see-also">See also<a href="#see-also" class="hash-link" aria-label="Direct link to See also" title="Direct link to See also"></a></h2>
|
||
<ul>
|
||
<li><a href="/mcp-client">Use Langflow as an MCP client</a></li>
|
||
<li><a href="/mcp-component-astra">Use a DataStax Astra DB MCP server</a></li>
|
||
</ul></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/mcp-client"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Use Langflow as an MCP client</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/mcp-component-astra"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Connect an Astra DB MCP server to Langflow</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a></li><li><a href="#select-flows-to-serve" class="table-of-contents__link toc-highlight">Select and configure flows to expose as MCP tools</a></li><li><a href="#connect-clients-to-use-the-servers-actions" class="table-of-contents__link toc-highlight">Connect clients to Langflow's MCP server</a><ul><li><a href="#authentication" class="table-of-contents__link toc-highlight">MCP server authentication and environment variables</a></li><li><a href="#deploy-your-server-externally" class="table-of-contents__link toc-highlight">Deploy your MCP server externally</a></li></ul></li><li><a href="#test-and-debug-flows" class="table-of-contents__link toc-highlight">Use MCP Inspector to test and debug flows</a></li><li><a href="#troubleshooting-mcp-server" class="table-of-contents__link toc-highlight">Troubleshooting MCP server</a></li><li><a href="#see-also" class="table-of-contents__link toc-highlight">See also</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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