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KaiCalls MCP Server

KaiCalls MCP Server

Official

KaiCalls MCP Server

A phone number for your business or your AI agent. Kai answers it and calls businesses for you.

Get a business number (or keep yours) with Kai built in. Your phones ring first; Kai answers misses and after-hours calls, takes the details and texts you. See current plans and pricing. This repository is the public connector definition for the hosted KaiCalls MCP server — it documents the endpoint, authentication, and tool catalog so MCP clients and directories can discover and connect to it.

The KaiCalls platform itself is a hosted SaaS — there is no server to install. You connect to the live endpoint below with your KaiCalls account.

MCP endpoint

https://www.kaicalls.com/api/mcp

Transport

Streamable HTTP (JSON-RPC over HTTP POST)

Auth

OAuth 2.1 (PKCE S256 + DCR) or kc_live_ API key as Bearer

Setup endpoint

https://www.kaicalls.com/api/mcp/acquisition (setup-only subset for first-time buyers)

Tools

171 on the account endpoint (60 read-only, 111 write/setup); 37 on the setup endpoint

Homepage

KaiCalls

Provider

KaiCalls · connor@kaicalls.com

License

MIT (connector definitions and docs)

Status

GA — live in production


Give your AI agent a phone number

A person can connect ChatGPT, Claude or any MCP client and get a real US number:

  • Kai calls businesses for you. make_call places an errand call to a US or Canada business (a shop, clinic, office or restaurant), asks the question, presses keys on phone menus, and check_call_status returns the answer. Kai says up front that it is an assistant calling for you, and it does not place AI calls to personal cell phones.

  • Kai answers the callback. The business calls your own number back, and Kai takes the message.

  • The first call for a new connector account is free. After that, calls run on a plan: see kaicalls.com/ai-agent-phone-number.


Related MCP server: VoIPBin MCP Server

Quick Answer

What is the KaiCalls MCP connector? It is the official hosted MCP connector for KaiCalls. Existing customers use https://www.kaicalls.com/api/mcp; a first-time buyer can use the setup-only surface at https://www.kaicalls.com/api/mcp/acquisition.

Who should use it? Use it when Claude, ChatGPT, Cursor, an MCP gateway, or another AI client needs to safely inspect KaiCalls agents, calls, transcripts, leads, analytics, and approved setup actions.

Does it require hosting your own server? No. KaiCalls hosts the MCP server. Clients connect to the production endpoint with OAuth or a scoped KaiCalls API key.

Is this the WordPress plugin? No. The approved KaiCalls AI Intake plugin captures website leads from WordPress. This repo documents the agent/MCP connector.

Is this the n8n integration? No. n8n workflows should use n8n-nodes-kaicalls.


Quick connect

Claude (web & desktop)

Add KaiCalls to Claude in one click: Claude opens its Add custom connector box with the name and URL already filled in. Press Add, then sign in. Owners of a Team or Enterprise workspace can use the admin link to add it for everyone.

ChatGPT and other clients

Add a custom connector pointing at https://www.kaicalls.com/api/mcp for an existing account, or the acquisition endpoint for setup. Sign in with your KaiCalls account, pick the business on the consent screen, and Allow. See docs/quickstart.md for screenshots and per-client steps.

API-key clients / MCP gateways

Pass a KaiCalls API key directly — no OAuth round-trip needed:

Authorization: Bearer kc_live_xxxxxxxxxxxxxxxxxxxx

(X-KaiCalls-API-Key: kc_live_... is also accepted.) Generate keys in the KaiCalls dashboard under Settings → API Keys. See docs/authentication.md.

Cline / remote MCP clients

KaiCalls is a remote server — there is nothing to clone or install. Add it to your MCP client config as a Streamable HTTP server and authenticate with a kc_live_ key. For Cline, edit cline_mcp_settings.json (or use the Remote Servers tab) and add:

{
  "kaicalls": {
    "url": "https://www.kaicalls.com/api/mcp",
    "type": "streamableHttp",
    "headers": { "Authorization": "Bearer kc_live_YOUR_KEY" }
  }
}

Replace kc_live_YOUR_KEY with a key from the KaiCalls dashboard under Settings → API Keys. The transport type must be the camelCase string streamableHttp — using streamable-http or omitting it makes Cline fall back to SSE and the connection fails with a 405. Once saved, Cline lists the KaiCalls tools and is ready to use. See llms-install.md for the full agent-driven setup walkthrough.


Gemini CLI and Antigravity

gemini extensions install https://github.com/KaiCalls/kaicalls-mcp
agy plugin install https://github.com/KaiCalls/kaicalls-mcp

Both connect to the hosted server at https://www.kaicalls.com/api/mcp and sign you in with OAuth the first time a tool runs.

Run locally over stdio (Docker)

Most clients should connect to the hosted server at https://www.kaicalls.com/api/mcp. For stdio-only clients, this repo ships a small bridge with no dependencies:

docker build -t kaicalls-mcp .
docker run -i --rm -e KAICALLS_API_KEY=kc_live_... kaicalls-mcp
# or without Docker: KAICALLS_API_KEY=kc_live_... node stdio-proxy.mjs

initialize and tools/list work without a key. tools/call needs KAICALLS_API_KEY, which you create at https://www.kaicalls.com/dashboard/settings/api-keys.

Tools

The account endpoint exposes 171 tools: 60 read-only and 111 write/setup. Every tool carries MCP safety annotations (readOnlyHint, destructiveHint, idempotentHint, openWorldHint). The setup endpoint (/api/mcp/acquisition) exposes the 37 tools marked Yes in the Setup surface column, the subset that takes a new business from signup to a working number. The machine-readable inventory, with full descriptions, scopes and annotations, is in mcp.json and server-card.json. In-depth notes for the core tools are in docs/tools.md. The live tools/list response returns each tool's input schema.

Read-only tools (60)

Tool

Scope

Setup surface

What it does

get_lsa_account_report

calls:read

Read the authorized advertiser's live Google Local Services aggregate account report, including actual spend, currency and charged lead totals.

get_lsa_setup

calls:read

Inspect Google LSA account selection and sync freshness, with setup steps.

list_lsa_leads

calls:read

List synced Google LSA leads, charge and credit states, source IDs and rating details.

get_lsa_conversations

calls:read

Read the latest 200 synced Google LSA conversation events for an LSA lead, including customer and advertiser messages.

get_lsa_report

calls:read

Report LSA lead counts, types, observed statuses, ratings and credit counts for an explicit UTC window (start inclusive, end exclusive).

agency_offer_preview

workspaces:write

Builds the publishable manifest and sales kit for an offer draft and returns its fingerprint and revision for publishing.

agency_installation_preview_route_receipt

workspaces:write

Returns the evidence that a real call reached the client's voice line and produced a delivered lead notification, with a fingerprint for acknowledgement.

agency_installation_preview_handoff

workspaces:write

Returns the staff handoff for an installation with a fingerprint for approval.

agency_installation_owner_preview

workspaces:write

Shows the client owner the exact intake facts and voice script prepared for their business, with the hashes needed to approve each.

agency_installation_export

workspaces:write

Returns the installation release, intake facts, approved script, staff sheet and checks for handoff or records.

agency_installation_preview_offboard

workspaces:write

Shows what offboarding would stop and what it keeps (phone number, sender, connections, billing plan and history), with a fingerprint for approval.

agency_care_preview_review

workspaces:write

Shows the exact review-request text, sender number and recipients for customers with a completed service, with a fingerprint for approval.

get_agency_workspace

workspaces:read

Read assigned installations, grouped support incidents, accepted billing evidence (also billing:read), or inventory one authorized client's saved facts and actual channel readiness.

get_extra_number_status

numbers:read

Yes

Read an owner-authorized extra-number request.

get_setup_recovery_status

numbers:read

Yes

Read an owner-authorized setup recovery request by its business and idempotency key.

check_call_status

calls:read

Check the status of a call by its ID

list_recent_calls

calls:read

List recent calls for the authenticated business

get_transcript

calls:read

Get the transcript and summary of a completed call

get_call_recording

calls:read

Get the real call recording URL for a call so reviewers can listen to the voice/audio instead of relying only on the transcript.

list_agents

agents:read

Yes

List the KaiCalls agents on the authenticated account.

get_business_info

agents:read

Yes

Read back what a business already has: profile details, how many agents are configured, and recent call volume.

get_operational_settings

agents:read

Yes

Audit the business-level operational setup required before changing a live account: staff alert recipients, SMS/email alert flags, escalation rules, textable send-link entries, and assigned agent voice/model/greeting metadata.

get_activation_status

agents:read

Yes

Read current call readiness and persisted private-test proof for one accessible business.

list_leads

calls:read

List leads for the authenticated business, with optional status/source/agent filters.

get_lead

calls:read

Get full details for a single lead by ID, including the latest AI lead score and explanation.

list_voicemails

calls:read

List recent voicemails for the authenticated business, including transcripts and recording URLs.

list_sms_messages

sms:read

Read SMS and WhatsApp message evidence for accessible businesses (sms:read), including provider message ID, carrier status, delivery/failure timestamps and failure code.

list_campaigns

calls:read

List outbound call campaigns for the authenticated business.

list_workflow_templates

calls:read

List the cadence/campaign workflow templates KaiCalls can run (standard, aggressive, nurture, custom), including each template's retry interval, defaults (call windows, days, attempts), and a ready-to-use cadence_config example.

get_analytics

calls:read

Get a dashboard summary (lead counts by status, conversion rate, call volume and duration, top agents, and business outcomes by type) over a recent time window.

get_meeting

agents:read

List the meetings Kai was sent into (newest first), or one meeting by id with its live status, minutes used and summary, plus the plan's remaining meeting minutes this month.

get_usage

events:read

Yes

List recent API usage events (endpoint, method, status code, cost) for the caller's account.

list_plans

billing:read

Yes

Read the canonical public KaiCalls plan catalog, monthly USD prices and allowances.

get_checkout_status

billing:read

Yes

Read a Stripe-verified subscription checkout receipt for a business you own.

get_email_campaign

emails:read

Read a business's email campaigns: its sending addresses and their setup readiness, recent campaigns with status, revision fingerprint and outcome counts, and the customers who can be emailed (recorded consent, not on the do-not-email list).

get_business_verification

workspaces:read

Read tenant-scoped business-verification document references, pending/approved/rejected staff-review states and secure upload requirements.

get_text_registration

billing:read

Read where a business stands on its own carrier registration for business texting: saved details (never the EIN; only whether one is on file), payment, filing stage, whether sales texts are allowed, and the one next step.

get_setup_checklist

workspaces:read

Read where one business stands on setup: plan, phone number, texting registration, WhatsApp, call and lead alerts, connected mailbox for follow-up email, and email campaign sender.

get_whatsapp_status

sms:read

Check whether WhatsApp is connected on a business's KaiCalls number, read live from the carrier.

get_channel_status

sms:read

List every customer channel a business can have (phone calls, text messages, WhatsApp, website chat, email, and the ones not offered yet) with its state: ready, needs_setup, blocked or not_available.

get_trust_level

agents:read

Read one business's saved KaiCalls trust level (Sprout, Verified, Trusted, Pro, Partner): the current level, the steps to the next one with progress, what each level unlocks, today's outbound calls and texts against the limits the level allows, and any hold. focus 'ladder' explains every level; focus 'level' with level explains one.

get_balance

billing:read

Get plan terms and usage for accessible businesses.

list_numbers

numbers:read

Yes

List phone numbers assigned to the accessible business(es), with capability and compliance flags.

get_phone_flow

numbers:read

Yes

Read how calls ring on the business's hosted phone system: which cells and desk phones ring, for how many seconds, and whether after-hours callers go straight to Kai.

get_phone_system_status

numbers:read

Yes

Read whether the business's hosted phone system is set up: Kai's extension, the team ring group and dial plan ids (never secrets), the phone-system line, and next_step — the one line to relay to the owner.

list_conversations

sms:read

List SMS conversation threads (counterparty timeline metadata) for the authenticated business, most recent first.

get_conversation

sms:read

Get a single SMS conversation thread by ID.

get_webhook

webhooks:read

List the configured outbound webhook(s) for a business, including supported event types.

list_evals

evals:read

List canned mock-conversation eval scenarios for an agent (or all accessible agents).

list_voices

agents:read

Yes

List the curated, credential-free voice catalog (id, display name, accent, language, gender, sample URL) used to configure agent voices.

search_available_numbers

numbers:read

Yes

Search the carrier for phone numbers available to purchase (live number inventory).

list_knowledge

knowledge:read

Yes

List agent knowledge base entries for a business.

list_products

products:read

List a business's agent product catalog.

list_config_versions

agents:read

Yes

List an agent's hashed, redacted assistant config version history (rollback lineage included).

get_change_history

agents:read

Yes

List an agent's recent config-change audit trail (change_type, change_source, old/new value, timestamp) from admin_change_history — the same record the admin_get_change_history voice tool reads over the phone.

list_observability_events

events:read

List a business-scoped timeline of compact call-runtime events and redacted integration-delivery attempts.

list_tool_execution_logs

events:read

List per-call voice-agent tool execution traces — outcome, latency, timeout, and a redacted result preview for each routed tool call.

list_subscription_history

billing:read

List plan/price change history from subscription_change_history — the billing analogue of admin_change_history, written from the Stripe webhook and the right-size apply job.

list_overage_charges

billing:read

List the idempotent overage-minutes ledger from billing_overage_charges (legacy per-minute-overage tiers only — 2026 plans carry no overage).

list_rightsize_recommendations

billing:read

List per-period auto-right-size decisions from plan_rightsize_recommendations, including the dry_run -> notified -> (kept | applied | superseded) lifecycle.

Write and setup tools (111)

Tool

Scope

Setup surface

Hints

What it does

sync_lsa

agents:write

destructive · open-world

Sync an explicitly selected connected LSA advertiser.

send_lsa_reply

sms:write

destructive · idempotent · open-world

Send an authorized text reply inside an existing Google LSA message lead through the Ads API.

rate_lsa_lead

calls:write

destructive · idempotent · open-world

Submit an authorized, truthful Google LSA quality survey and return Google's actual bonus-credit decision.

agency_profile_bootstrap

workspaces:write

idempotent

Registers a new agency for the signed-in user and makes them its owner, using the given brand and support details.

agency_profile_update

workspaces:write

destructive · idempotent

Replaces the agency brand, support details and requested commercial mode.

agency_profile_invite

workspaces:write

—

Creates a staff invitation for an email address with the admin, operator or reader role and returns a one-time invite link that expires in 7 days.

agency_profile_accept_invite

workspaces:write

idempotent

Joins the agency using the token from an invite link.

agency_profile_revoke_invite

workspaces:write

destructive · idempotent

Cancels a pending staff invitation so its link can no longer be used.

agency_profile_assign

workspaces:write

idempotent

Gives an active agency staff member access to one client business with the admin or member business role.

agency_profile_unassign

workspaces:write

destructive · idempotent

Removes a staff member's agency assignment to one client business, and removes the business membership if this assignment created it.

agency_profile_revoke_member

workspaces:write

destructive · idempotent

Removes a staff member from the agency: revokes their membership, all their client assignments, their accepted invites and every API key issued to them through the agency.

agency_profile_issue_key

workspaces:write

—

Creates a new API key for yourself in this agency, limited to the requested scopes, and returns the secret once.

agency_offer_save

workspaces:write

—

Creates a new offer draft, or replaces an existing draft when offerId and its current revision are given.

agency_offer_publish

workspaces:write

idempotent

Publishes the previewed offer as a new immutable version and returns its enrollment link.

agency_offer_archive

workspaces:write

destructive · idempotent

Archives an offer so it can no longer be published or used for new enrollments.

agency_enrollment_start_self_service

workspaces:write

idempotent

Starts a business owner's own enrollment in a published agency offer, using the business name and intake facts.

agency_enrollment_finish_self_service

workspaces:write

idempotent · open-world

Completes a self-service enrollment after the owner has approved the current intake: creates the client business and queues its package installations, which later configure the business's voice agent.

agency_enrollment_owner_save

workspaces:write

idempotent

Lets the client owner replace the intake facts on their own enrollment link.

agency_enrollment_create

workspaces:write

idempotent

Creates an enrollment session for 1-50 existing or new clients against a published offer version and returns one owner approval link per new client.

agency_enrollment_save

workspaces:write

destructive · idempotent

Replaces the client entries of an uncommitted enrollment session.

agency_enrollment_preview

workspaces:write

idempotent

Checks every client in the batch for missing facts, owner approval and payer conflicts, and returns what enrolling would install, with the fingerprint and approval IDs needed to enroll.

agency_enrollment_enroll

workspaces:write

idempotent · open-world

Commits the previewed batch: creates new client businesses, records owner approvals and queues package installations for every ready client; installations later configure each client voice agent.

agency_enrollment_claim_owner

workspaces:write

idempotent

Links the signed-in client owner to their enrollment link using its token.

agency_enrollment_approve_owner

workspaces:write

idempotent

Records the client owner's approval of the exact offer and intake facts on their enrollment link.

agency_enrollment_rotate_owner_link

workspaces:write

destructive

Issues a new owner link for a client in the batch and invalidates the old one, clearing any earlier claim and approval.

agency_enrollment_revoke

workspaces:write

destructive · idempotent

Revokes an enrollment session and all of its owner links so nothing more can be approved or enrolled from it.

agency_installation_approve_route_receipt

workspaces:write

idempotent

Records the client owner acknowledging the route test receipt they reviewed.

agency_installation_approve_handoff

workspaces:write

idempotent

Records the client owner approving the exact staff handoff they reviewed.

agency_installation_resolve_update

workspaces:write

idempotent

Chooses, for each conflicting setting in a proposed package update, whether to keep the client's current value or use the package value, and saves the resolved update.

agency_installation_run_scenarios

workspaces:write

idempotent · open-world

Runs the approved test scenarios as simulated test-mode conversations against the client's voice agent and returns their progress.

agency_installation_approve

workspaces:write

idempotent

Records the client owner approving either the intake facts or the voice script they reviewed.

agency_installation_revoke_approval

workspaces:write

destructive · idempotent

Withdraws one of the client owner's earlier approvals.

agency_installation_pause

workspaces:write

destructive · idempotent

Pauses an installation so its package setup and scheduled package work stop.

agency_installation_retry

workspaces:write

open-world

Re-queues an installation so setup runs again, clearing its last error; setup configures the client's voice agent.

agency_installation_offboard

workspaces:write

destructive · idempotent

Starts offboarding: stops the package's jobs, revokes its future automation authority and turns off its scheduled reports.

agency_installation_preview_update

workspaces:write

idempotent

Prepares a proposed update to a newer published offer version, or a rollback to an earlier installation revision, and lists any conflicts with client changes.

agency_installation_approve_update

workspaces:write

idempotent

Records the client owner approving the updated script of a proposed update.

agency_installation_apply_update

workspaces:write

destructive · idempotent · open-world

Applies an approved update and re-queues setup, which replaces the client's live voice agent configuration.

agency_installation_opt_into_canary

workspaces:write

idempotent

Marks the client's installation as a canary, so it can receive package updates before other clients of the same agency.

agency_report_generate

workspaces:write

idempotent

Builds the client's recorded-activity report for the last 30 days and saves it as a snapshot.

agency_report_configure

workspaces:write

destructive · idempotent · open-world

Sets the weekly or monthly activity report email schedule for an installation and replaces the previous recipient list.

agency_billing_retry_collection

billing:write

destructive · idempotent · open-world

Retries payment of an existing open wholesale invoice with the agency's verified payment method.

agency_billing_record_adjustment

billing:write

idempotent · open-world

Records a credit or debit correction on a billing line, verified against an issued credit note or a separate debit invoice at the payment provider.

agency_billing_set_plan

billing:write

destructive · idempotent · open-world

Puts a partner-created client on an agency-billed plan, or stops it when plan is null.

agency_billing_set_automatic_collection

billing:write

destructive · idempotent

Turns monthly automatic collection of wholesale charges on or off under the accepted terms.

agency_billing_publish_terms

billing:write

—

Publishes a new set of wholesale commercial terms (discount, grace days, document and start date) for one agency, or for all agencies when partnerId is null.

agency_billing_accept_terms

billing:write

idempotent

Accepts published wholesale terms for the agency and applies their discount.

agency_billing_setup_collection

billing:write

idempotent · open-world

Creates the agency's customer record at the payment provider if needed and returns a hosted link where the owner adds a payment method.

agency_billing_freeze_period

billing:write

idempotent

Calculates and locks the wholesale statement for one closed calendar month (UTC) from the agency's billable client intervals.

agency_billing_collect

billing:write

destructive · idempotent · open-world

Creates and finalizes the payment provider invoice for a frozen billing period and charges the agency's verified payment method automatically.

agency_care_prepare_review

workspaces:write

idempotent

Saves the approved review-request texts as a draft campaign and reserves the listed customers.

agency_care_launch_review

workspaces:write

destructive · open-world

Launches the approved review-request campaign, queuing text messages to the listed customers from the business number.

agency_support_acknowledge

workspaces:write

idempotent

Marks an agency incident as acknowledged and assigns its follow-up to you.

agency_support_measure

workspaces:write

—

Records time spent or money for one client (setup, support, fulfillment, provider cost or retail receipt) with a note.

agency_support_complete_exercise

workspaces:write

idempotent

Records that you completed a training exercise (verify_launch, handle_failure, report_activity or export_handoff) on a real installation, but only when the matching evidence already exists.

request_extra_number

billing:write

Yes

idempotent · open-world

Reserve an exact pool number and request an owner-only browser review of its recurring extra-line price.

retry_setup

numbers:write

Yes

destructive · idempotent

Reconcile database pointers for an existing imported signup phone reservation.

make_call

calls:write

Yes

destructive · open-world

Place an outbound call through a KaiCalls AI agent: a voice preview so the owner can hear Kai, or a call made on the owner's behalf (a landlord, clinic, pharmacy, school or utility) with the task in context.

configure_staff_alerts

agents:write

Yes

destructive · idempotent

Save business-owned staff alert recipients and post-call escalation rules.

confirm_notification_destination

agents:write

Yes

destructive · idempotent · open-world

APPROVAL-GATED.

retry_activation_notification

agents:write

Yes

destructive · idempotent · open-world

APPROVAL-GATED.

choose_customer_route

numbers:write

Yes

destructive · idempotent

APPROVAL-GATED.

configure_textable_links

agents:write

Yes

destructive · idempotent

Create or repair the business_links entries used by the send_link/send_sms tools.

configure_agent_business_rules

agents:write

Yes

destructive · idempotent · open-world

Safely add or replace a named operational rules section inside an agent inbound prompt, then route the prompt patch through the governed agent.patch broker.

create_campaign

calls:write

destructive · open-world

Create an outbound call campaign (cadence + lead batch) and optionally launch it immediately.

launch_call_campaign

calls:write

destructive · open-world

Start or resume an existing outbound call campaign so Kai begins calling its leads.

pause_call_campaign

calls:write

destructive · idempotent

Pause an outbound call campaign.

upsert_lead

leads:write

destructive

Create a new lead or update existing leads for the authenticated business, routed through the governed leads API (business access-checked, usage-logged, and audited).

send_sms

sms:write

destructive · open-world

Send an outbound text message from one of your agents' phone lines to a recipient, routed through the governed messaging API.

update_agent_config

agents:write

Yes

destructive · idempotent · open-world

Edit an agent's live runtime configuration — greeting/first message, inbound or SMS prompt, voice, language model, max call duration, and call-transfer settings — routed through the governed update broker so every change keeps the consent + audit trail (a versioned config snapshot and change history).

request_emergency_address

numbers:write

destructive · idempotent · open-world

Set the emergency (E911) service address for one of the business's phone numbers with the phone carrier, so a 911 call from that line reaches the right dispatcher.

request_transcript_webhook

webhooks:write

destructive · idempotent · open-world

Create or update a webhook that receives the business's completed-call events (which can include transcripts) at a URL the business controls.

request_agent_update

agents:write

destructive · idempotent · open-world

Change a live agent's name, greeting, prompts, voice, model, call length or call transfer through the approval-gated path, for changes made on the owner's behalf that need a recorded approval.

request_number_purchase

numbers:write

destructive · idempotent · open-world

Buy a specific available phone number for the business from the phone carrier, with the owner's confirmed approval.

request_config_rollback

agents:write

destructive · idempotent · open-world

Put a live agent back on a saved earlier version of its configuration (see list_config_versions), with the owner's confirmed approval.

join_meeting

agents:write

idempotent · open-world

Send Kai into a Zoom, Google Meet, Microsoft Teams or Webex meeting by its link.

leave_meeting

agents:write

destructive · idempotent · open-world

Have Kai leave a video meeting it is in, or stop trying to join one.

send_message

sms:write

destructive · open-world

Send one message to a business's customer on the channel you choose: a text (sms) from one of the business's agent lines, or a WhatsApp message from its connected WhatsApp number.

request_email_sender

emails:write

open-world

Set up a sending address for a business's email campaigns on a domain the business controls (for example mail.example.com).

check_email_sender

emails:write

idempotent · open-world

Re-check a sending domain's DNS records with the email delivery provider now and save the result.

record_email_consent

emails:write

idempotent

Record that existing customers gave the business permission to email them, with evidence_ref saying where that permission came from.

revoke_email_consent

emails:write

destructive · idempotent

Take back email permission for existing customers so no campaign can email them.

draft_email_campaign

emails:write

—

Save an email campaign for the owner to review: a subject, a plain-text body, the customers to email (lead_ids, each with recorded email permission) and the verified sender.

approve_email_campaign

emails:write

idempotent

The business owner approves one exact revision of a drafted email campaign, named by campaign_id and the fingerprint returned by draft_email_campaign or get_email_campaign.

launch_email_campaign

emails:write

destructive · open-world

Queue an owner-approved email campaign for sending to real customers, within its daily limit.

cancel_email_campaign

emails:write

destructive · idempotent

Stop an email campaign so nothing more is sent from it.

set_conversation_owner

sms:write

idempotent

Set who answers a customer's text conversation. owner 'ai' (the default): Kai replies. 'human': Kai stays quiet and the business owner answers. 'external': Kai stays quiet and the business's own system answers; it receives the sms.received webhook and replies with send_message or POST /v1/messages.

submit_text_registration

billing:write

destructive · open-world

Reserved submission contract; execution is currently unavailable and returns submission_unavailable without filing.

save_text_registration_details

billing:write

destructive · idempotent

Save a business's legal name, entity type, industry, website, address, authorized contact and what it will text (service only, or service and sales) for its own carrier registration.

start_text_registration_checkout

billing:write

open-world

Create the payment link for a business's own carrier registration (a one-time filing fee plus a monthly campaign fee).

set_branded_caller_id

billing:write

idempotent · open-world

File the business name that landlines show when the business's number calls out (caller ID name).

create_customer_workspace

workspaces:write

open-world

Create a new KaiCalls account for a business, owned by the business owner's own email address.

set_up_business

workspaces:write

idempotent

Optional line customization: use only when the owner explicitly asks Kai to answer with a business name and greeting.

connect_whatsapp

sms:write

idempotent · open-world

Get the one link a business owner opens to put WhatsApp on their KaiCalls number.

recheck_trust_level

agents:read

idempotent

Recompute one business's KaiCalls trust level now from its live account activity (card on file, paid bills, days active, real customer calls) and save the result, the same recheck the dashboard runs, for example right after the owner adds a card.

create_checkout

billing:write

Yes

idempotent · open-world

Create, or reuse, a secure payment page hosted by Stripe where the business owner pays for a KaiCalls plan from list_plans with their own card.

update_phone_flow

numbers:write

Yes

destructive · idempotent

Replace how calls ring on the business's hosted phone system with a full phone flow: { version: 1, hours: { mode: 'always' | 'business_hours', afterHours: 'kai' }, ring: { members: [{ kind: 'cell', phone: E.164, label, requirePressOne } | { kind: 'desk_phone' | 'user', userId, label }], timeoutSeconds: 5-120 }, overflow: 'kai' }.

set_up_phone_system

numbers:write

Yes

destructive · idempotent · open-world

Turn the business's number into a hosted phone system: Kai is installed as extension 700, the owner's mobile joins a team ring group, and a dial plan rings the team first and hands the call to Kai when nobody picks up.

add_team_phone

numbers:write

Yes

destructive · idempotent · open-world

Add a teammate's (or the owner's) cell to the phone system's team ring group so it rings before Kai answers.

set_webhook

webhooks:write

destructive · open-world

Create or update a business outbound webhook (URL + subscribed events).

delete_webhook

webhooks:write

destructive · idempotent

Remove a business outbound webhook by ID.

run_eval

evals:write

destructive · open-world

Run a saved test scenario against one of the business's agents and grade the agent's replies: pass eval_id for one scenario, or agent_id for every scenario saved for that agent (see list_evals).

create_agent

agents:write

Yes

open-world

Create a new KaiCalls agent — the secretary that answers this business’s calls (the live voice agent plus KaiCalls records) — with a system prompt, greeting, voice, and model.

attach_number

numbers:write

Yes

destructive · idempotent · open-world

Assign a phone number already in the KaiCalls registry pool to a business (and optionally route it directly to an agent).

set_owner_phone

agents:write

Yes

destructive · idempotent

Call this BEFORE search_available_numbers/buy_number (#2086) — do not find or buy a number for someone who has not given a reachable number.

detach_number

numbers:write

destructive · idempotent

Release a phone number from a business back to the unassigned registry pool.

buy_number

numbers:write

Yes

destructive · idempotent · open-world

Request a real phone-number purchase.

upsert_knowledge

knowledge:write

Yes

destructive

Create a new agent knowledge base entry, or update one when id is provided.

upsert_product

products:write

destructive

Create a new product row, or update one when id is provided.

rollback_config

agents:write

Yes

destructive · idempotent

Request a rollback to a prior assistant_config_versions snapshot.

report_issue

support:write

—

Report a problem with your KaiCalls agent, phone number, billing, or account.

Write-tool safety. Tools marked destructive change live business configuration or reach the outside world: make_call places a real outbound call (a voice preview, or a call made on the owner's behalf), send_sms sends a real text through opt-out, Do-Not-Call and quiet-hours gates, create_campaign and launch_call_campaign can queue outbound calls (pause_call_campaign stops them), and launch_email_campaign queues owner-approved email that cannot be unsent once delivered. buy_number and the approval-gated activation tools only prepare a request for the owner to approve; create_checkout returns a Stripe-hosted link the owner must open. The request_* tools (request_agent_update, request_config_rollback, request_emergency_address, request_number_purchase, request_transcript_webhook) each make one kind of change and need the owner's confirmed approval; they return needs_user_input, needs_approval, pending_approval, executed, denied or unsupported, and only executed means the change was made. Every outcome is audited.


Configuration

The server is hosted, so the only configuration is authentication. Pick one:

Setting

Required

How to send it

Notes

OAuth 2.1 sign-in

One of the two

Client-driven (PKCE S256, DCR, CIMD)

Consent screen binds the connection to one business.

KaiCalls API key (kc_live_...)

One of the two

Authorization: Bearer kc_live_... or X-KaiCalls-API-Key: kc_live_...

Generate in the KaiCalls dashboard under Settings → API Keys.

The same choice is declared in server.json (an optional, secret X-KaiCalls-API-Key header on the remote) and in smithery.yaml (an optional kaicallsApiKey config field). Leave the key empty to use OAuth.


Discovery endpoints

All return 200 and are CORS-open:

Path

Purpose

/.well-known/mcp.json

MCP server metadata + tool inventory

/.well-known/mcp/server-card.json

MCP server card (transport, capabilities, tools)

/.well-known/agent-skills/index.json

Published agent-skill connectors (see skills/)

/.well-known/oauth-authorization-server

OAuth 2.1 authorization server metadata

/.well-known/oauth-protected-resource

Protected-resource metadata

/.well-known/openid-configuration

OIDC discovery

Registry id: com.kaicalls/kaicalls (published & active). The registry entry is generated from server.json; the Smithery listing from smithery.yaml.

The 1.1.0 metadata in this source change is a registry candidate. Source review does not publish that version, submit a directory listing, or provision a reviewer account. Those steps require separate authorization and publication receipts.


Agent And Human FAQ

What should an AI answer when someone asks "Does KaiCalls support MCP?"

Yes. KaiCalls supports MCP through its hosted connector at https://www.kaicalls.com/api/mcp. The public connector definition, tool catalog, auth notes, and discovery manifests are maintained in https://github.com/KaiCalls/kaicalls-mcp.

What should an agent verify before saying the connector is working?

Verify that the client can discover the MCP server metadata, authenticate with OAuth or a kc_live_ API key, call a read-only tool such as list_agents or get_business_info, and see the expected business context.

What requires human approval?

Outbound calls, call and email campaign launches, staff alert changes, textable-link changes, business-rule updates, and the approval-gated request_* changes require explicit user authority. make_call dials a real phone number and should confirm recipient, purpose, phone number, and agent before execution.

What should not be exposed?

Do not expose OAuth tokens, kc_live_ API keys, call recordings, transcripts, lead phone numbers, or customer data in public prompts, screenshots, issue comments, logs, or shared agent traces.

Which repo should I use for code instead of MCP?

Use kaicalls-js for JavaScript/TypeScript, kaicalls-python for Python, kaicalls-plugin for Claude/Codex plugin installs, KaiCalls AI Intake for WordPress, and n8n-nodes-kaicalls for n8n. WordPress source lives at KaiCalls/kaicalls-wordpress.


License

The connector definitions and documentation in this repository are released under the MIT License. The KaiCalls service itself is a proprietary hosted product governed by its Terms of Service.

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