# MCP (/docs/troubleshooting/mcp)

# Connected account not found error

This error occurs when MCP cannot find a valid connected account for authentication:

* **Specify an account**: Provide either `connected_account_id` or `user_id` in your MCP configuration
* **Default behavior**: Without specification, MCP uses `user_id=default`. If multiple connections exist with the same user\_id, the most recent is used
* **Verification checklist**:
  * Account status is `ACTIVE` (not deleted)
  * Account belongs to the same auth config used to create the MCP server

Learn more: [Single Toolkit MCP](/docs/single-toolkit-mcp)

# Getting 404 errors

Verify your URL format matches one of these patterns:

* `https://mcp.composio.dev/composio/server//mcp`
* `https://apollo-<randomID>-composio.vercel.app/v3/mcp/`
* `https://apollo.composio.dev/v3/mcp/`

# Getting 401 Unauthorized errors

If your MCP client gets `401 Unauthorized`, include your Composio project API key in request headers:

* Header name: `x-api-key`
* Value: your project API key from the Composio dashboard

When `require_mcp_api_key` is enabled on your project, requests without this header are rejected.

# Testing and debugging

If experiencing issues, test your MCP server with:

* [Postman MCP Requests](https://learning.postman.com/docs/postman-ai-developer-tools/mcp-requests/create/)
* [MCP Inspector](https://modelcontextprotocol.io/docs/tools/inspector)

This helps identify whether the issue is with your MCP client or the server.

# Reporting MCP issues

When reporting to support, provide:

* **Error message**: Complete error details

* **MCP server URL**: The exact URL you're connecting to and the corresponding `mcp_server_id`

![Example MCP server URL shown in the Composio dashboard](/images/troubleshooting/troubleshooting-mcp-server-url.png)

* **Testing results**: Whether issue reproduces in MCP Inspector/Postman or only in specific client

* **Connected account ID**: If facing connection issues

![Example connected account ID used for MCP authentication](/images/troubleshooting/troubleshooting-mcp-connected-account-id.png)

* **Reproduction steps**: Clear steps to reproduce the issue

# Getting help

* **Email**: [support@composio.dev](mailto:support@composio.dev)
* **Discord**: [#support-form](https://discord.com/channels/1170785031560646836/1268871288156323901)

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📚 **More documentation:** [View all docs](https://docs.composio.dev/llms.txt) | [Glossary](https://docs.composio.dev/llms.mdx/docs/glossary) | [Cookbooks](https://docs.composio.dev/llms.mdx/cookbooks) | [API Reference](https://docs.composio.dev/llms.mdx/reference)

---

# Composio SDK — Instructions for AI Code Generators

**Purpose:** Enforce only the **current** and **correct** patterns for integrating [Composio](https://composio.dev/) tools into AI agents.
**Scope:** All AI-generated code using Composio must follow these guardrails.

---

## 1. Correct Composio Integration

Composio supports two integration modes: **Native Tools** (with a provider package) and **MCP** (no provider package needed).

### Native Tools

```python
# ✅ CORRECT — Python (defaults to OpenAI)
from composio import Composio

composio = Composio()
session = composio.create(user_id="user_123")
tools = session.tools()
# Pass tools to your agent/LLM framework
```

```typescript
// ✅ CORRECT — TypeScript (defaults to OpenAI)
import { Composio } from "@composio/core";

const composio = new Composio();
const session = await composio.create("user_123");
const tools = await session.tools();
// Pass tools to your agent/LLM framework
```

For other providers, pass the provider explicitly. Provider packages follow the naming convention: `composio_<provider>` for Python, `@composio/<provider>` for TypeScript.

### MCP

Use `session.mcp.url` and `session.mcp.headers` with any MCP-compatible client (Claude Desktop, Cursor, OpenAI Agents, etc.). No provider package needed.

---

## 2. CRITICAL INSTRUCTIONS FOR AI MODELS

### 2.1 — ALWAYS DO THE FOLLOWING

1. **Use `composio.create(user_id)`** to create a session — this is the entry point for all Composio integrations.
2. **Use `session.tools()`** for native tool integration or **`session.mcp.url`** for MCP integration.
3. **Import** from the correct provider package (`composio_<provider>` for Python, `@composio/<provider>` for TypeScript).
4. **Pass `user_id` to `composio.create()`**, not to individual tool calls.

### 2.2 — NEVER DO THE FOLLOWING

1. **Do not** instruct users to manually create auth configs or connected accounts before running.
2. **Do not** import from `composio_openai` / `@composio/openai` when using OpenAI Agents SDK — use `composio_openai_agents` / `@composio/openai-agents` instead.

### 2.3 — DISCOURAGED (do not use unless user explicitly asks)

Do **not** generate `composio.tools.get()`, `composio.tools.execute()`, or `composio.provider.handle_tool_calls()` unless the user explicitly requests direct tool execution. These are a supported but **not recommended** low-level interface.


---

## Terminology Migration (old → current)

If you encounter these terms in error messages, old documentation, or user prompts, translate them to the current equivalents. **Do not use the old terms in generated code or explanations.**

| Old term (v1/v2) | Current term (v3) | In code |
|---|---|---|
| entity ID | user ID | `user_id` parameter |
| actions | tools | e.g., `GITHUB_CREATE_ISSUE` is a *tool* |
| apps / appType | toolkits | e.g., `github` is a *toolkit* |
| integration / integration ID | auth config / auth config ID | `auth_config_id` parameter |
| connection | connected account | `connected_accounts` namespace |
| ComposioToolSet / OpenAIToolSet | `Composio` class with a provider | `Composio(provider=...)` |
| toolset | provider | e.g., `OpenAIProvider` |

If a user says "entity ID", they mean `user_id`. If they say "integration", they mean "auth config". Always respond using the current terminology.