# How to connect Polar Signals MCP to Claude Cowork

```json
{
  "title": "How to connect Polar Signals MCP to Claude Cowork",
  "toolkit": "Polar Signals MCP",
  "toolkit_slug": "polar_signals_mcp",
  "framework": "Claude Cowork",
  "framework_slug": "claude-cowork",
  "url": "https://composio.dev/toolkits/polar_signals_mcp/framework/claude-cowork",
  "markdown_url": "https://composio.dev/toolkits/polar_signals_mcp/framework/claude-cowork.md",
  "updated_at": "2026-09-06T05:34:49.861Z"
}
```

## Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.
This guide walks you through the easiest and most secure way to connect your Polar Signals account to Cowork via Composio Connect, enabling it to summarize top CPU hotspots last week, list regressions across releases for auth-service, create optimization checklist for auth-service hotspots, and more such actions on your behalf without compromising your account security.

## Also integrate Polar Signals MCP with

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

## Connect Polar Signals MCP to Claude Cowork

### Connecting Polar Signals to Claude 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 Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.
With Composio Connect, Cowork can securely access apps like Polar Signals through MCP without you sharing account credentials directly with the agent.

## What is the Polar Signals MCP server, and what's possible with it?

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

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `POLAR_SIGNALS_MCP_LIST_PROJECTS` | List projects | List all projects accessible to the current user. IMPORTANT: Call this FIRST before using any other tools. Returns project IDs and names. You need a project ID for all other tool calls. If only one project is returned, use it automatically. If a project is specified in the user's instructions (e.g. claude.md or system prompt), prefer that one. Otherwise, ask the user which project to use. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_FLAMEGRAPH` | Query profile flamegraph | Return a flame graph as a breadth-first call tree. Each row has id, parent (the parent row's id, -1 = a root), depth, cumulative, flat, function_name — rebuild the tree via the parent pointers. Unsymbolized frames (no function_name) instead carry their hex memory address in an extra 'address' column, shown only when such frames are present. Use this for a top-down picture of where time goes; 'query_profile_table' gives a flat ranked list and 'query_profile_sandwich' focuses on one function. Drill into a subtree with 'focus_path'. Same query syntax as 'query_profile_table'. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_LABELS` | Query profile labels | Get available label names for a specific profile type. Call this after 'profile_types' to discover what labels exist. You MUST use exact profile type strings from 'profile_types' output. Returns label names that can be used with 'values' and in 'query_profile_table' queries - do not invent label names. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_LABEL_VALUES` | Query profile label values | List the values a profiling label takes (e.g. the process names for the 'comm' label). These are label values used to filter queries — not the sampled values of the profile itself. Use it to discover valid filter values; only use label names from 'query_profile_labels'. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_SANDWICH` | Query profile sandwich | Show the calling context around a specific function: which functions call it (callers) and which functions it calls (callees). Use this after 'query_profile_table' to drill into a specific function. The function_name should be an exact function name from 'query_profile_table' results. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_SOURCE` | Query profile source | Retrieve per-line profiling data for a specific source file. Returns line numbers with flat and cumulative sample counts — without returning the source code itself (read the file directly and correlate using line numbers). |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_TABLE` | Query profile table | Query profiling data as a flat table of functions sorted by cumulative time. Recommended workflow: first call 'list_projects', then 'profile_types', then 'labels', then 'values' to discover valid query components. Query syntax: 'profile_type{label="value"}' where all components come from previous tool outputs. With symbolized=false, unsymbolized rows (no function_name) gain an 'address' column carrying their hex memory address. |
| `POLAR_SIGNALS_MCP_QUERY_PROFILE_TYPES` | Query profile types | ProfileTypes returns the list of available profile types. IMPORTANT: Call 'list_projects' first to get a project ID. Profile types follow the format 'name:sample_type:sample_unit:period_type:period_unit[:delta]' (e.g. 'parca_agent:samples:count:cpu:nanoseconds:delta'). You MUST use these exact strings when calling 'labels' or 'query_profile_table' - do not invent or shorten profile type names. |

## Supported Triggers

None listed.

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

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

## Complete Code

None listed.

## How to build Polar Signals MCP Agent with another framework

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

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## Frequently Asked Questions

### What are the differences in Tool Router MCP and Polar Signals MCP?

With a standalone Polar Signals MCP server, the agents and LLMs can only access a fixed set of Polar Signals tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Polar Signals 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 Polar Signals tools.

### Can I manage the permissions and scopes for Polar Signals while using Tool Router?

Yes, absolutely. You can configure which Polar Signals 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 Polar Signals data and credentials are handled as safely as possible.

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