Connectors · AI

Cartesia MCP server for AI agents.

actionlake is an MCP gateway: one remote MCP server that connects Claude and other MCP clients to Cartesia and the rest of your systems. It gives your agent 108 Cartesia actions (54 reads, 32 writes and 22 that wait for a confirmation) and holds the Cartesia credential itself, so the agent never does. It paces Cartesia's limits and records every call.

Connect Cartesia free See pricing

100,000 free calls a month. No card, no email, no password: press Start a free sandbox on the next screen and keep the key it shows you.

claude mcp add --transport http actionlake https://connect.actionlake.com/mcp

108actionsin one signed file
54readlook, never change
32writecreate and update
22wait for a yesdestructive, confirmed first

Set up

Connect Cartesia in three steps.

01
Add actionlake to Claude.
Run the command once in Claude Code; its consent page can create a free sandbox: 100,000 calls a month, no card. In the Claude app, add a custom connector with the URL below and paste your key on the consent page. Creating a new sandbox from the Claude app is not yet tested by us.
https://connect.actionlake.com/mcp
02
Connect Cartesia.
API key. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead. actionlake stores what you paste write-only, sealed under your tenant's key.
- api_keyCartesia API key (sk_car_...): create one at play.cartesia.ai/keys
```
account { op: "connections.requirements", service: "cartesia" }
# free: exactly what to paste, and what is found for you
```

Make the first call. Check before a write.

Ask in plain words; Claude picks the action. Before anything changes, check validates the call and prices it, for free.

do    { action: "cartesia.folders.list" }# list folders · read · 1 upstream callcheck { action: "cartesia.folders.create", input: { … } }# free: inputs, permissions, cost and confirmations, nothing sent

Cartesia at a glance

Sign-in: API key. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead.
You provide: api_key
Limits we pace to: 5 calls a second, per connection
API covered: Cartesia API (Cartesia-Version 2026-08-14; OpenAPI 3 per reference page)api.cartesia.ai
Built from: Cartesia's documentation, read 23 October 2026docs.cartesia.ai docs.cartesia.ai
Service file: Version 1.0.0, signed (Ed25519)
Cached reads: 52 of 54 reads, for up to 5 minutes; a write clears what it affects
Shared entities: 4, so ask can line Cartesia up with your other systems
Data: Processed and stored in Sydney, Australia. No US region yet

Capabilities

What an AI agent can do in Cartesia.

108 actions in 28 areas. Every one carries its effect, so a key can allow the reads and hold the rest.

54readlook, never change
32writecreate and update
22destructivewait for a confirmation

Datasets
7
3 read · 2 write · 2 destructive
Create a new dataset · Paginated list of datasets · Paginated list of files in a dataset · Retrieve a specific dataset by ID
Voices
7
2 read · 3 write · 2 destructive
List Voices · Localize Voice · Add Voice Accents · Get Voice
Agents
6
4 read · 1 write · 1 destructive
List Agents · List Phone Numbers (Deprecated) · List Templates · Get Agent
Calls
6
3 read · 1 write · 2 destructive
List Calls · Create Outbound Call · Get Call · Delete Call
Documents
6
2 read · 3 write · 1 destructive
List Documents · Create Document · Get Document · Update Document
Metrics
6
2 read · 2 write · 2 destructive
Add Metric to Agent · Create Metric · List Metrics · Get Metric
Phone numbers
6
2 read · 3 write · 1 destructive
Import Phone Number · List Phone Numbers · Provision Cartesia Number · Get Phone Number
Agent tools
5
2 read · 2 write · 1 destructive
Create a tool · List tools · Get a tool · Update a tool

20 more areas · 59 actions

Call batches 5
Fine tunes 5
Folders 5
Line agents 5
Pronunciation dicts 5
Telephony providers 5
Webhooks 5
Org invites 4
Files 3
Org users 3
API keys 2
Deployments 2
Line agent versions 2
Usage 2
Accents 1
Access tokens 1
API 1
Line agent models 1
Metric results 1
Models 1

Top actions

The Cartesia API, shaped for agents.

The ids your agent types, what each does, and the one name it shares with other systems. 16 of Cartesia's 16 action names are shared with at least one other connector, so an agent learns them once.

Action	What it does	Effect	Same name in
`cartesia.folders.list`List Folders	List Folders.	read	`content.folder.list`62 connectors
`cartesia.documents.list`List Documents	List Documents.	read	`content.document.list`28 connectors
`cartesia.calls.list`List Calls	List Calls.	read	`comm.call.list`44 connectors
`cartesia.folders.create`Create Folder	Create Folder.	write	`content.folder.create`62 connectors
`cartesia.org_users.list`List Users	List Users.	read	`identity.user.list`474 connectors
`cartesia.documents.create`Create Document	Create Document.	write	`content.document.create`29 connectors
`cartesia.folders.delete`Delete Folder	Delete Folder.	destructive	`content.folder.delete`46 connectors
`cartesia.calls.create_outbound`Create Outbound Call	Create Outbound Call.	write	`comm.call.create`38 connectors
`cartesia.org_users.get`Get User	Get User.	read	`identity.user.get`399 connectors
`cartesia.agents.list`List Agents	List Agents.	read	this connector
`cartesia.voices.list`List Voices	List Voices.	read	this connector
`cartesia.voices.localize`Localize Voice	Localize Voice.	write	this connector

Try it

Prompts to paste into Claude.

Each one names the Cartesia actions it will call, so you know what it reads and what it changes before you send it.

Readread
Who has access in Cartesia? List every user and their role.
callscartesia.org_users.list
Writewrite
Create Folder in Cartesia. Show me exactly what you will send before you save it.
callscartesia.folders.create

Governance for Cartesia

Destructive actions wait for a yes.

22 Cartesia actions are destructive. These are all of them:

Delete Foldercartesia.folders.delete
Delete Documentcartesia.documents.delete
Delete Callcartesia.calls.delete
Delete Agentcartesia.agents.delete
Delete Voicecartesia.voices.delete
Delete an agentcartesia.line_agents.delete
Delete Voice Accentcartesia.voices.delete_accent
Cancel Callcartesia.calls.cancel
Delete an uploaded filecartesia.files.delete
Delete Metriccartesia.metrics.delete
Delete a datasetcartesia.datasets.delete
Delete Webhookcartesia.webhooks.delete
Remove Usercartesia.org_users.remove
Delete a fine-tunecartesia.fine_tunes.delete
Delete a toolcartesia.agent_tools.delete
Remove a file from a datasetcartesia.datasets.delete_file
Delete Phone Numbercartesia.phone_numbers.delete
Remove Metric from Agentcartesia.metrics.remove_from_agent
Delete a pronunciation dictionarycartesia.pronunciation_dicts.delete
Delete Providercartesia.telephony_providers.delete
Cancel Invitecartesia.org_invites.cancel
Cancel Call Batchcartesia.call_batches.cancel

A destructive action runs only with confirm: true. Under the human policy the agent cannot confirm for itself: the run stops until a named person approves, in the console or from a signed link in an email. The cap on a key is refused before the call is sent, never after.

docartesia.folders.deleteconfirm_policy: human

Delete Folder?

intent: the user asked me to delete Folder

run suspended · waiting for a named person · key cartesia-agent cannot confirm itself

In the console, or from an emailed signed link.

a key for this connector

account {  op: "keys.create", name: "cartesia-agent",  allowed_actions: ["cartesia.*"], cap_calls: 2000,  confirm_policy: "human_for_writes",  approval_rules: [    { match: "cartesia.folders.delete", approver: "[email protected]" },    { match: "cartesia.documents.delete", approver: "[email protected]" },    { match: "cartesia.calls.delete", approver: "[email protected]" }  ]}

Illustrative. Scoped to Cartesia only, capped at 2,000 upstream calls, every write confirmed, and the destructive ones approved by a named person.

Cost

What Cartesia costs on actionlake.

Every Cartesia action is one upstream call, the only thing actionlake bills. Searching, check, cost, account and any call Cartesia refused with 401, 403, 429 or a 5xx are free. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

1upstream call per actionall 108 Cartesia actions
108actions pageeach page of a long list is one call
52reads can be cacheda cache hit costs nothing
100,000calls a month, freepaid plans from US$49 a month for 250,000

See pricing

Action index

Every Cartesia action.

108 actions by area: the id your agent calls, what it does, and its effect.

Datasets7

cartesia.datasets.createCreate a new datasetwrite
cartesia.datasets.deleteDelete a datasetdestructive
cartesia.datasets.delete_fileRemove a file from a datasetdestructive
cartesia.datasets.getRetrieve a specific dataset by IDread
cartesia.datasets.listPaginated list of datasetsread
cartesia.datasets.list_filesPaginated list of files in a datasetread
cartesia.datasets.updateUpdate an existing datasetwrite

Voices7

cartesia.voices.add_accentsAdd Voice Accentswrite
cartesia.voices.deleteDelete Voicedestructive
cartesia.voices.delete_accentDelete Voice Accentdestructive
cartesia.voices.getGet Voiceread
cartesia.voices.listList Voicesread
cartesia.voices.localizeLocalize Voicewrite
cartesia.voices.updateUpdate Voicewrite

Agents6

cartesia.agents.deleteDelete Agentdestructive
cartesia.agents.getGet Agentread
cartesia.agents.listList Agentsread
cartesia.agents.list_phone_numbersList Phone Numbers (Deprecated)read
cartesia.agents.list_templatesList Templatesread
cartesia.agents.updateUpdate Agentwrite

Calls6

cartesia.calls.cancelCancel Calldestructive
cartesia.calls.create_outboundCreate Outbound Callwrite
cartesia.calls.deleteDelete Calldestructive
cartesia.calls.getGet Callread
cartesia.calls.get_logsGet Call Runtime Logsread
cartesia.calls.listList Callsread

Documents6

cartesia.documents.createCreate Documentwrite
cartesia.documents.create_bulkBulk Create Documentswrite
cartesia.documents.deleteDelete Documentdestructive
cartesia.documents.getGet Documentread
cartesia.documents.listList Documentsread
cartesia.documents.updateUpdate Documentwrite

Metrics6

cartesia.metrics.add_to_agentAdd Metric to Agentwrite
cartesia.metrics.createCreate Metricwrite
cartesia.metrics.deleteDelete Metricdestructive
cartesia.metrics.getGet Metricread
cartesia.metrics.listList Metricsread
cartesia.metrics.remove_from_agentRemove Metric from Agentdestructive

Phone numbers6

cartesia.phone_numbers.deleteDelete Phone Numberdestructive
cartesia.phone_numbers.getGet Phone Numberread
cartesia.phone_numbers.importImport Phone Numberwrite
cartesia.phone_numbers.listList Phone Numbersread
cartesia.phone_numbers.provisionProvision Cartesia Numberwrite
cartesia.phone_numbers.updateUpdate Phone Numberwrite

Agent tools5

cartesia.agent_tools.createCreate a toolwrite
cartesia.agent_tools.deleteDelete a tooldestructive
cartesia.agent_tools.getGet a toolread
cartesia.agent_tools.listList toolsread
cartesia.agent_tools.updateUpdate a toolwrite

Call batches5

cartesia.call_batches.cancelCancel Call Batchdestructive
cartesia.call_batches.createCreate Call Batchwrite
cartesia.call_batches.getGet Call Batchread
cartesia.call_batches.listList Call Batchesread
cartesia.call_batches.retryRetry Call Batchwrite

Fine tunes5

cartesia.fine_tunes.createCreate a new fine-tunewrite
cartesia.fine_tunes.deleteDelete a fine-tunedestructive
cartesia.fine_tunes.getRetrieve a specific fine-tune by IDread
cartesia.fine_tunes.listPaginated list of all fine-tunes for the authenticated userread
cartesia.fine_tunes.list_voicesList all voices created from a fine-tuneread

Folders5

cartesia.folders.createCreate Folderwrite
cartesia.folders.deleteDelete Folderdestructive
cartesia.folders.getGet Folderread
cartesia.folders.listList Foldersread
cartesia.folders.updateUpdate Folderwrite

Line agents5

cartesia.line_agents.createCreate an agentwrite
cartesia.line_agents.deleteDelete an agentdestructive
cartesia.line_agents.getGet an agentread
cartesia.line_agents.listList agentsread
cartesia.line_agents.updateUpdate an agentwrite

Pronunciation dicts5

cartesia.pronunciation_dicts.createCreate a new pronunciation dictionarywrite
cartesia.pronunciation_dicts.deleteDelete a pronunciation dictionarydestructive
cartesia.pronunciation_dicts.getRetrieve a specific pronunciation dictionary by IDread
cartesia.pronunciation_dicts.listList all pronunciation dictionaries for the authenticated userread
cartesia.pronunciation_dicts.updateUpdate a pronunciation dictionarywrite

Telephony providers5

cartesia.telephony_providers.createCreate Providerwrite
cartesia.telephony_providers.deleteDelete Providerdestructive
cartesia.telephony_providers.getGet Providerread
cartesia.telephony_providers.listList Providersread
cartesia.telephony_providers.updateUpdate Providerwrite

Webhooks5

cartesia.webhooks.createCreate Webhookwrite
cartesia.webhooks.deleteDelete Webhookdestructive
cartesia.webhooks.getGet Webhookread
cartesia.webhooks.listList Webhooksread
cartesia.webhooks.updateUpdate Webhookwrite

Org invites4

cartesia.org_invites.cancelCancel Invitedestructive
cartesia.org_invites.createCreate Inviteswrite
cartesia.org_invites.getGet Inviteread
cartesia.org_invites.listList Invitesread

Files3

cartesia.files.deleteDelete an uploaded filedestructive
cartesia.files.getRetrieve a file's metadataread
cartesia.files.listPaginated list of your uploaded filesread

Org users3

cartesia.org_users.getGet Userread
cartesia.org_users.listList Usersread
cartesia.org_users.removeRemove Userdestructive

API keys2

cartesia.api_keys.getGet API Keyread
cartesia.api_keys.listList API Keysread

Deployments2

cartesia.deployments.getGet Deploymentread
cartesia.deployments.listList Deploymentsread

Line agent versions2

cartesia.line_agent_versions.getGet an agent versionread
cartesia.line_agent_versions.listList agent versionsread

Usage2

cartesia.usage.get_agentsGet Agent Usageread
cartesia.usage.get_creditsGet Credit Usageread

Accents1

cartesia.accents.listList Accentsread

Access tokens1

cartesia.access_tokens.createGenerate a New Access Tokenwrite

API1

cartesia.api.get_statusAPI Status and Versionread

Line agent models1

cartesia.line_agent_models.listList agent modelsread

Metric results1

cartesia.metric_results.listList Metric Resultsread

Models1

cartesia.models.listList Modelsread

Questions

The Cartesia MCP server, answered.

Is there a Cartesia MCP server for Claude?

Yes. actionlake is an MCP gateway: a remote MCP server that gives Claude, or another MCP client, 108 Cartesia actions across datasets, voices, agents and calls, through the same eight tools it uses for every other connector. actionlake is independent; it is not made or endorsed by Cartesia.

What do I need to connect Cartesia?

Cartesia API key (sk_car_...): create one at play.cartesia.ai/keys. The free call account { op: "connections.requirements", service: "cartesia" } lists exactly what to paste.

Can an AI agent delete or change things in Cartesia?

Only if its key allows it, and only with an explicit confirmation. 22 Cartesia actions are destructive, including delete Folder, delete Document and delete Call. Each runs only with confirm: true. Under the human confirm policy, or an approval rule on the key, the run waits until a named person approves it.

Will an AI agent use up my Cartesia API limit?

actionlake paces every call to the limits in the Cartesia service file: 5 calls a second per connection. Repeated reads are answered from cache (52 Cartesia actions can be), which never reaches Cartesia.

What does a Cartesia action cost?

One upstream call, the only unit actionlake bills. A list that pages bills one call per page (108 Cartesia actions page). Cache hits, searches, dry runs and calls Cartesia refused with 401, 403, 429 or a 5xx are free. The Free plan includes 100,000 calls a month with no card. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

Which Cartesia API does it cover?

The Cartesia API (Cartesia-Version 2026-08-14; OpenAPI 3 per reference page) at api.cartesia.ai. It is built from Cartesia's documentation as read on 23 October 2026. 108 actions in 28 areas, each one in the signed service file (version 1.0.0).

Does actionlake keep my Cartesia data, and where?

actionlake processes and stores data in Sydney, Australia; there is no US region yet. Reads may be cached for up to 5 minutes, and a write clears the reads it affects. Each run's request and response is kept, sealed, for your plan's trace window: 1 day on Free, 3 days on Starter, 7 days on Pro, 14 days on Team, 30 days on Business and 30 days on Enterprise. Your Cartesia credential is sealed under your tenant's key, never logged and never returned. Your traffic is not used to train models.

Which AI clients can use it?

Claude Code, tested by us end to end, and the Claude app as a custom connector, tested by us with an existing key. Other MCP clients that support remote servers over Streamable HTTP (MCP revisions 2025-06-18 and 2025-11-25) and OAuth dynamic client registration, or a bearer header, should connect the same way; we have not tested them. Or plain REST, under the same action names.

Give your agent Cartesia today.

Connect Cartesia free See pricing

Start free - 100,000 calls/month, no card. No signup. Hard caps on every key. Cached answers are free.

Cartesia MCP server for AI agents.

Connect Cartesia in three steps.

Add actionlake to Claude.

Connect Cartesia.

Make the first call. Check before a write.

What an AI agent can do in Cartesia.

Datasets

Voices

Agents

Calls

Documents

Metrics

Phone numbers

Agent tools