> For the complete documentation index, see [llms.txt](https://docs.nansen.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nansen.ai/mcp/connectors/claude-tag.md). # Claude Tag (Slack) Connect Nansen to Claude Tag to ask for onchain data in Slack. Sign in with a Nansen account through OAuth. ## Before you connect * Admin access to your organization's Claude Tag settings. * A dedicated Nansen account with API credits for shared-channel requests. * A Slack channel where you can test the connection. {% hint style="info" %} **Whose credits are used?** Requests made through the bundle use the connected Nansen account and consume that account's API credits. Confirm the account and its billing owner before connecting. Use a dedicated organization account for shared channels. Personal connectors apply in DMs and, where enabled and permitted, to a member's own channel tasks. {% endhint %} ## 1. Choose an access bundle Open [Claude Tag settings](https://claude.ai/admin-settings/claude-tag). Select your test channel under **Claude Tag's access**, then create or attach an **Access bundle** for that channel. Check inherited connections before testing. A bundle attached at **Default Slack** applies across workspaces and channels. Confirm that requests use the account connected to your test bundle. ## 2. Connect Nansen with OAuth 1. Open the bundle's **Credentials** tab and click **Connect** beside **Custom tool**. 2. Set **Credential type** to **MCP Connector**. 3. Choose your organization's Nansen provider if it is already available. Otherwise, select **Add custom connector...**, enter the URL below, and click **Verify connector**. 4. Enter a connection name, click the provider's **Sign in** button, and authorize the dedicated Nansen account. ``` https://mcp.nansen.ai/ra/connector-curated/mcp ``` The organization connector should use **Sign in now** and **Use Claude's published identity**. No manually entered OAuth client ID or client secret is needed for this setup.
Claude Tag MCP Connector form showing the Nansen server and OAuth sign-in button

Provider discovery before sign-in. Provider names vary by organization. This example shows Slack Default; use your test channel's bundle for the pilot.

The form shows the MCP server the connection can reach. Review that URL and the Nansen account before approving access. ## 3. Enable the MCP plugin For a custom remote MCP server, [Anthropic documents a plugin plus a credential](https://claude.com/docs/claude-tag/admins/connections/custom#add-a-custom-mcp-server). Have your administrator add a plugin whose `.mcp.json` declares the MCP URL above, then enable it in the same bundle's **Plugins** tab. A `.mcp.json` in a repository Claude clones is not loaded on its own. {% hint style="info" %} Plugin setup and the combined plugin/OAuth flow still need validation in Claude Tag. A connector directory listing alone does not establish that this step is unnecessary. {% endhint %} ## 4. Try a request in Slack Invite Claude to the channel if needed: ``` /invite @Claude ``` Start a new thread so it picks up the plugin, then ask: > @Claude, use Nansen to look up USDC on Ethereum. Tell me which tool you used and report any authentication or credit error. Check that the request used the intended Nansen account and its API credits before enabling the connection in more channels. If it fails, check the bundle's channel scope, plugin, connection status and account credit balance. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.nansen.ai/mcp/connectors/claude-tag.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.