Limits and errors

Limits

	Limit
Requests	120 a minute per account, across all its connections
One answer	200,000 characters. A longer one is refused so the app can ask for less.
Connections	10 at a time
Changes	10 a minute per connection; 20 new watchlists, notes and alerts a day per account — see Changes and safety
Lists in one call	up to 50 symbols for prices, 8 for a comparison, 100 a page of trades
History	daily prices for up to a year, weekly for 2 and 5 years; up to 20 years of financial statements; 24 months of insider trades; 5 years of Congress trades

How errors arrive

There are two kinds.

The connection is refused. The whole request fails with an HTTP status and a JSON body:

{
  "error": {
    "code": "UNAUTHENTICATED",
    "message": "This MCP link is not valid. Make a new token and update the connector."
  }
}

One tool fails. The request succeeds, and the tool’s result is marked as an error with a code and a message the AI app can read and act on — usually by asking you or trying again with less:

{ "error": { "code": "UNKNOWN_SYMBOL", "message": "…" } }

Messages are written for people. Internal details are never sent.

Connection errors

Status	Code	Means	What to do
401	UNAUTHENTICATED	The token is wrong, was mistyped, or was disconnected.	Make a new connection in Settings › AI apps and update the connector.
403	EMAIL_NOT_VERIFIED	The account’s email isn’t confirmed yet.	Finish signing up with the code from your email.
403	ACCOUNT_PENDING	The account isn’t open yet.	You’ll get an email when it opens.
403	SUBSCRIPTION_ENDED	“Your access has ended.” The trial or plan is over.	Write to support to continue. Nothing is deleted.
403	ACCOUNT_SUSPENDED · ACCOUNT_REJECTED	The account can’t be used.	Write to support.
405	METHOD_NOT_ALLOWED	Something other than POST was sent.	The server answers POST only; MCP apps do this for you.
429	RATE_LIMITED	More than 120 requests in a minute.	Wait a moment.

Tool errors

Code	Means
NOT_FOUND	No such portfolio, watchlist, note or alert on your account — the same answer whether it doesn’t exist or isn’t yours.
UNKNOWN_SYMBOL	No stock or ETF with that symbol.
VALIDATION_ERROR	A value is out of range or doesn’t fit — for example a reminder in the past.
RESULT_TOO_LARGE	“The answer is too large. Ask for a shorter period, fewer symbols or fewer rows.”
MCP_READ_ONLY	A manage tool on a Read only connection. Make a new connection with Read and manage.
MCP_WRITE_RATE_LIMITED	More than 10 changes in a minute on this connection.
MCP_DAILY_LIMIT	20 new watchlists, notes and alerts in 24 hours.
MCP_ALERT_LIMIT	50 alerts already on.
TELEGRAM_NOT_LINKED	Telegram was asked for, but the account hasn’t connected it.
INTERNAL_ERROR	“Something went wrong. Try again in a moment.”

When making a connection in the app, an eleventh one is refused with MCP_TOKEN_LIMIT: disconnect one you no longer use first.