Integration · Productivity
Connect Claude & ChatGPT to Cassidy
Let your AI talk to the assistants you have built in Cassidy. It can start a new chat thread with an assistant, send it a message and get the reply, and read the messages in threads you already have. You can hand a question to the Cassidy assistant that knows your company's material, without switching apps.
Free plan, no credit card. Takes about a minute.
Try asking
“Which Cassidy chats do I have?”
The AI lists your existing chat threads so you can pick one to read or continue.
“Show me what was said in my last thread with the sales assistant.”
It gets all messages in that thread, including the assistant's replies.
“Start a new chat with assistant asst_123.”
It creates a new thread with that assistant and returns the thread ID.
What your AI can do
Chat with your assistants
Start a thread with any Cassidy assistant by its ID and send messages to get its replies.
Read past threads
List your chat threads and read every message in one, including the assistant's answers.
Only four tools
A small, clear set: list threads, get thread messages, create a thread and send a message.
“Ask our support assistant how we handle refund requests.”
It sends the question to the assistant in a thread and returns its answer.
“Continue yesterday's thread and ask for a shorter version.”
It finds the thread and sends a follow-up message, then shows the new reply.
“Summarize the answers from my three most recent threads.”
It reads the messages in each thread and sums up what the assistants replied.
4 tools for Cassidy
These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.
create_threadChanges dataStart a new chat thread with one of your Cassidy assistants, given its `assistant_id` (copy it from the assistant in Cassidy). Returns the new thread ID.get_thread_messagesGet all messages in one chat thread by `thread_id`, including the assistant's replies.list_threadsList your existing Cassidy chat threads, so you can pick one to read or continue.send_messageVisible to othersSend a `message` to a Cassidy assistant in an existing thread (`thread_id`) and get its reply. The assistant may take actions its workflows allow.
Set up in three steps
- 1
Pick the app
Create a free PipMCP account and choose Cassidy from the app list.
- 2
Paste your key
Paste a Cassidy API key. In Cassidy, open your account menu › Organization Settings › API Keys, click + Create API Key, name it and save. Reveal the key with the eye icon and copy it. It is shown only once.
- 3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
- Click your name, then Settings › Connectors › Add custom connector.
- Paste your link as the Remote MCP server URL.
- Switch it on from the + menu in a chat.
Questions
What can the AI do in Cassidy?
The AI can list your chat threads, read the messages in a thread, start a new thread with one of your Cassidy assistants and send a message to get the assistant's reply.
Does the AI see my Cassidy API key?
No. Your Cassidy API key is encrypted at rest and never shown to the AI. After you save it, it is not shown again, not even to you. The AI only sees the results of the tools it calls.
Can I control what the AI is allowed to do?
Yes. You choose which tools are switched on, so you can start by only reading threads. Sending a message can make a Cassidy assistant take the actions its workflows allow, so you can require your approval before it runs. Every tool call is logged.
Does it work with ChatGPT?
Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your PipMCP link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.
What does it cost?
PipMCP has a free plan with no credit card required. Paid plans bill per completed task. You also need your own Cassidy account.
Where do I find an assistant's ID?
You copy the assistant ID from the assistant in Cassidy. The AI needs it to start a new thread. To continue an existing chat, it can list your threads instead and use the thread ID.
Let your AI work in Cassidy today.
Start free. Your key stays encrypted, and you decide what the AI may do.
Connect Cassidy freePipMCP is not affiliated with Cassidy. Product names are trademarks of their owners.