# How to connect Blitz API to Claude

```json
{
  "title": "How to connect Blitz API to Claude",
  "toolkit": "Blitz API",
  "toolkit_slug": "blitz_api",
  "framework": "Claude Cowork",
  "framework_slug": "claude-cowork",
  "url": "https://composio.dev/toolkits/blitz_api/framework/claude-cowork",
  "markdown_url": "https://composio.dev/toolkits/blitz_api/framework/claude-cowork.md",
  "updated_at": "2026-09-11T05:35:11.322Z"
}
```

## Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.
This guide walks you through the easiest and most secure way to connect your Blitz API account to Claude via Composio Connect, enabling it to find contacts at Acme Inc and enrich, list open roles matching product manager, enrich company profiles for top leads, and more such actions on your behalf without compromising your account security.
Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

## Also integrate Blitz API with

- [ChatGPT Work](https://composio.dev/toolkits/blitz_api/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/blitz_api/framework/hermes-agent)

## Connect Blitz API to Claude Cowork

### Connecting Blitz API to Claude Web, Desktop, and Cowork
1. Open Customize
In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.
2. Add the Composio MCP server
Click Add custom connector and paste in the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## What is the Blitz API MCP server, and what's possible with it?

The Blitz API MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Blitz API account. It provides structured and secure access so your agent can perform Blitz API operations on your behalf.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `BLITZ_API_ENRICH_COMPANY` | Enrich Company | Retrieve a full company profile from an exact LinkedIn company page URL. A successful match consumes record credits. |
| `BLITZ_API_FIND_COMPANIES_HIRING` | Find Companies Hiring | Find distinct companies hiring for matching jobs and return each company's matched-job count. Returns one metered page and an opaque continuation cursor. |
| `BLITZ_API_FIND_WORK_EMAIL` | Find Work Email | Retrieve a verified work email for a person identified by LinkedIn profile URL. A successful match consumes record credits. |
| `BLITZ_API_GET_API_KEY_DETAILS` | Get API Key Details | Validate the connected BlitzAPI key and return its record balance, per-endpoint rate limit, allowed API routes, and active plans. |
| `BLITZ_API_GET_CHANGELOG` | Get Changelog | Return recent public BlitzAPI changelog entries newest first, optionally limited by age and count. |
| `BLITZ_API_GET_COMPANY_EMPLOYEE_DISTRIBUTION` | Get Company Employee Distribution | Return a company's employee counts and percentages grouped by country or department; each call consumes record credits. |
| `BLITZ_API_LIST_COMPANY_EMPLOYEES` | List Company Employees | Browse employees at one exact LinkedIn company using location, seniority, department, and connection-count filters. Returns one metered page and an opaque continuation cursor; unlike broad Search People, this action preserves BlitzAPI's one-company page browsing contract. |
| `BLITZ_API_RESOLVE_DOMAIN_TO_LINKEDIN_COMPANY` | Resolve Domain to LinkedIn Company | Resolve a website domain or URL to its primary LinkedIn company page and possible alternatives. A successful match consumes record credits. |
| `BLITZ_API_RESOLVE_LINKEDIN_COMPANY_TO_DOMAIN` | Resolve LinkedIn Company to Domain | Resolve a LinkedIn company page URL to its canonical email domain. A valid lookup with no match returns found=false and email_domain=null; a successful match may consume record credits. |
| `BLITZ_API_RESOLVE_PERSON` | Resolve Person | Resolve a verified work email or US phone number in E.164 format to a full professional profile. Phone lookup is US-only and requires a paid-plan route entitlement. A valid no-match returns found=false and person=null; a successful match consumes 1 record credit. |
| `BLITZ_API_SEARCH_COMPANIES` | Search Companies | Search companies by firmographics, funding, traffic, keywords, and headquarters criteria; returns one metered page and an opaque continuation cursor. |
| `BLITZ_API_SEARCH_COMPANY_JOBS` | Search Company Jobs | List live job postings for one exact LinkedIn company, optionally filtered by job attributes; return one metered page with a continuation cursor. |
| `BLITZ_API_SEARCH_JOBS` | Search Jobs | Search live job postings by role, description, semantic keywords, recency, location, and company criteria; return one metered page with a continuation cursor. |
| `BLITZ_API_SEARCH_PEOPLE` | Search People | Search professional profiles across one or more companies using person, role, location, education, and firmographic filters. Returns one metered page and an opaque continuation cursor. |
| `BLITZ_API_WATERFALL_ICP_SEARCH` | Waterfall ICP Search | Find and rank decision-makers at one company using an ordered cascade of title and location rules; successful results consume record credits. |

## Supported Triggers

None listed.

## Troubleshooting

### 1. Why does Claude not use the Composio connector for Blitz API?

The connector can show as connected, but Claude must use it in each Blitz API conversation.
- Click + at the lower left of the chat, or type /.
- Hover Connectors.
- Turn on Composio.
- Ask Claude to connect to Blitz API again.

### 2. Why does Claude show an MCP server error before Blitz API connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Blitz API.
- Check that the connector URL is https://connect.composio.dev/mcp.
- Connectors run from Anthropic's cloud, so your device network is usually not the problem.
- Add the connector again from Customize > Connectors, then ask Claude to connect Blitz API.
- If it fails again, send the error and the ofid_ reference id to support@composio.dev.

### 3. Why does the Blitz API authorization link not work?

The Composio connector is one server. Your Blitz API account connects separately when Claude asks for it.
- If the browser does not open, or the link expires, ask Claude to retry the Blitz API connection.
- Composio creates a fresh Blitz API authorization link.
- Open that link in your browser and finish the Blitz API sign-in.

### 4. Why do Blitz API actions fail after they worked before?

The Blitz API connection can expire or lose permission.
- Ask Claude to inspect the Blitz API connection.
- If the connection is unhealthy, disconnect it when Claude prompts you.
- Reconnect the Blitz API account and retry the action.
- If Claude shows a permission prompt, approve it before Claude changes data in Blitz API.
- If the action still fails with a permission error, check that the connected account has that permission in Blitz API itself.

### 5. How do I switch to a different Blitz API account?

Claude can manage the Blitz API connection for you.
- Ask Claude to disconnect or delete the current Blitz API account.
- Ask Claude to connect Blitz API again.
- Open the new Composio authorization link for Blitz API.
- Sign in with the other Blitz API account in the browser.
- After the account connects, ask Claude to retry the Blitz API task.

### 6. Why is my Blitz API connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Blitz API connection works in Claude Web, Desktop, and Cowork.
- In Claude Desktop, open Customize > Connectors.
- Next to Composio, click ⋮ and click Clear cache.
- If Blitz API tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
- On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Blitz API.

## Creating MCP Server - Stand-alone vs Composio SDK

The Blitz API MCP server connects Claude Web, Desktop, and Cowork to your Blitz API account through Composio. Once connected, Claude can use the available Blitz API tools and triggers to complete tasks on your behalf.

## Complete Code

None listed.

## How to build Blitz API MCP Agent with another framework

- [ChatGPT Work](https://composio.dev/toolkits/blitz_api/framework/chatgpt)
- [Hermes](https://composio.dev/toolkits/blitz_api/framework/hermes-agent)

## Related Toolkits

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- [Salesforce](https://composio.dev/toolkits/salesforce) - Salesforce is a leading CRM platform that helps businesses manage sales, service, and marketing. It centralizes customer data, enabling teams to drive growth and build strong relationships.
- [Apollo](https://composio.dev/toolkits/apollo) - Apollo is a CRM and lead generation platform that helps businesses discover contacts and manage sales pipelines. Use it to streamline customer outreach and track your deals from one place.
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- [Clay MCP](https://composio.dev/toolkits/clay_mcp) - Clay MCP is a prospect enrichment service for researching companies and contacts. It runs enrichment providers and Clay functions to return enriched prospect data.
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- [Close MCP](https://composio.dev/toolkits/close_mcp) - Close MCP is a CRM MCP exposing leads, contacts, opportunities, activities, communications, and workflows. Use it to give agents scoped, auditable access to your CRM data.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Blitz API MCP?

With a standalone Blitz API MCP server, the agents and LLMs can only access a fixed set of Blitz API tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Blitz API and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with Claude Cowork?

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Blitz API tools.

### Can I manage the permissions and scopes for Blitz API while using Tool Router?

Yes, absolutely. You can configure which Blitz API scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Blitz API data and credentials are handled as safely as possible.

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