Chronary MCP Server

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answering

Chronary is answering right now. Last checked 4 min ago. 254 installs a week from npm. It exposes 58 tools. Last commit 17 Oct 2026.

Calendar API for AI agents: events, availability, Google/Microsoft setup, scheduling, and iCal.

Installs per day peak 203 · avg 24 · +1% w/w

a month agotoday

Uptime history 91 days of history · worst day 94%

91 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

326 ms

Response time

average over 24h

254

Installs / week

npm and PyPI

What changed 22

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 30 September 2026. No other catalogue keeps this.

28 Oct 4 tools appeared cancel_upgrade_request, get_billing, get_upgrade_request and 1 more

28 Oct 2 tools changed the parameters they ask for create_webhook, update_webhook

28 Oct a tool description was rewritten cancel_proposal

18 Oct a tool changed the parameters it asks for update_ical_subscription

30 Sep 14 tools changed the parameters they ask for cancel_connection_link, cancel_event, create_connection_link and 11 more

What the code does

We read the source, 1 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Secret passed into the image build Dockerfile:18

ENV CHRONARY_API_KEY=placeholder-for-introspection

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://api.chronary.ai/mcp

Settings → Connectors → Add custom connector, then paste this address

https://api.chronary.ai/mcp

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://api.chronary.ai/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://api.chronary.ai/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://api.chronary.ai/mcp"
    }
  }
}

Available tools 58

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

calendar

create_calendar

Create a calendar to hold events and track availability. Calendars are required before creating events — call this first when setting up a new agent. An agent can have multiple calendars (e.g. "Work", "Personal"). Org-level calendars (no agent_id) can be used as shared resources like meeting rooms.

delete_calendar

Delete a calendar (soft delete). Its events are no longer returned and it stops contributing to availability. Agent-scoped keys may only delete calendars owned by their agent.

get_calendar

Fetch a single calendar by ID, including its name, timezone, agent status, and default reminders. Agent-scoped keys may only read calendars owned by their agent.

get_calendar_context

Get a calendar's temporal context in a single call: the current event (if one is happening now), the next upcoming event, recent past events, a short upcoming window, and the owning agent's status (idle/working/waiting/error). Use this to answer "what is this agent doing right now?" without issuing multiple list_events queries.

update_calendar

Update a calendar's name, timezone, agent status, default reminders, or metadata. Agent-scoped keys may only update calendars owned by their agent.

webhook

create_webhook

Create a webhook subscription so the org receives HTTP POST notifications when events occur (e.g. event.created, proposal.confirmed). The signing secret is returned ONCE in this response — store it to verify the HMAC-SHA256 signature on delivered payloads. Requires an org-level API key.

delete_webhook

Permanently delete a webhook subscription. This frees its endpoint slot against the per-plan cap. Requires an org-level API key.

get_webhook

Get a single webhook subscription by id, including its subscribed event types and active state. The signing secret is never returned. Requires an org-level API key.

list_webhook_deliveries

List delivery attempts for a webhook subscription, with per-status counts (pending/delivered/failed). Use this to debug failing deliveries. Requires an org-level API key.

update_webhook

Update a webhook subscription — change its delivery URL, the set of subscribed event types, or pause/resume it via active. At least one field must be supplied. Requires an org-level API key.

agent

create_agent

Register your agent (AI assistant, human participant, or resource) with Chronary so it can own calendars, events, and webhooks.

delete_agent

Decommission an agent. This marks the agent as decommissioned and revokes all of its scoped API keys. Requires an org-level API key — agent-scoped keys cannot delete agents.

get_agent

Fetch a single agent by ID. An agent represents an AI assistant, human, or shared resource (e.g. a meeting room). Agent-scoped API keys may only read their own agent.

update_agent

Update an agent's name, description, metadata, or status (active/paused). Requires an org-level API key — agent-scoped keys cannot mutate agents.

booking

create_booking_page

Create a public booking page (a hosted scheduling link) for a calendar. Returns a booking_url to send to a human; when they pick a slot, a confirmed event is created on the calendar and an event.created webhook fires with a booking_page_id field. Set availability_constraints to restrict to weekly working hours; existing calendar events always block slots.

delete_booking_page

Delete (deactivate) a booking page. Its hosted URL stops resolving; already-booked events are unaffected.

get_booking_page

Fetch a single booking page by ID, including its public booking_url and settings.

list_booking_pages

List booking pages in the org. Agent-scoped keys see only pages on their own agent's calendars.

cancel

cancel_connection_link

Cancel a pending human-calendar setup request. This invalidates the setup URL and does not disconnect an already completed Google or Microsoft connection.

cancel_event

Delete or cancel an event from a calendar. Use this to remove, cancel, or delete any scheduled event or appointment. The event is marked cancelled and excluded from future availability calculations. For a recurring series, pass `occurrence_start` to cancel just that one occurrence (the series continues); omit it to cancel the whole series. `calendar_id` is optional — if omitted the calendar is looked up from the event. Provide `calendar_id` to fail fast on cross-calendar typos.

cancel_proposal

Cancel an open proposal. Fires a proposal.cancelled webhook with reason="organizer_cancelled". Requires an org-level API key. Works on every plan, so an org that dropped to Free can still cancel proposals it made on Pro.

cancel_upgrade_request

Withdraw a pending upgrade request (for example, if you no longer need Pro).

ical

delete_ical_subscription

Delete an external iCal feed subscription. Events previously synced from the feed are no longer refreshed.

get_ical_subscription

Get a single external iCal feed subscription by id, including its sync status, last sync time, and last error.

list_ical_subscriptions

List an agent's external iCal feed subscriptions (e.g. linked Google Calendar / Outlook feeds), including their sync status and last sync time.

update_ical_subscription

Update an external iCal feed subscription — change its label or its feed URL. Changing the URL forces a full re-sync on the next poll.

availability

get_availability

Check when a single agent is free across its Chronary calendars and any human calendars authorized for that agent. This tool is fail-closed: always inspect `availability_state` and `warnings` before using slots. Accepts `start`/`end` or the `start_time`/`end_time` aliases.

get_availability_rules

Read the buffer times and working-hours rules configured on a calendar. Returns the rules row, or an error if none are set.

set_availability_rules

Set or replace the availability rules on a calendar — buffer times before/after events and optional per-day working hours. When these rules are set, every availability query on this calendar automatically applies them (busy-block expansion for buffers, masking outside working hours). Upsert: overwrites any existing rules.

event

create_event

Create a booking, appointment, meeting, hold, or any scheduled event on a calendar. The calendar_id comes from create_calendar or list_events. Once created, this event blocks the agent's availability during that time and appears in availability queries. Use status="hold" with hold_expires_at to tentatively reserve a slot that auto-releases on TTL.

get_event

Retrieve a single event by ID, including its title, times, status, location, reminders, and metadata. Works for both internally created events and externally synced iCal events. `calendar_id` is optional — if omitted the calendar is resolved from the event. Provide `calendar_id` to fail fast on cross-calendar typos.

update_event

Reschedule or edit an event — change its title, description, start/end times, location, status, reminders, or metadata. Use this to move an appointment to a new time or update its details. Provide only the fields you want to change. Holds cannot be edited via this tool (use confirm_event / release_event). External iCal events are read-only. `calendar_id` is optional — if omitted it is resolved from the event.

connection

create_connection_link

Request human setup of Google Calendar or Microsoft Outlook for a Chronary calendar. Give setup_url to a human; the agent never receives OAuth credentials, provider calendar names, or event data. The secret URL is returned only on first creation. If reused=true and setup_url is null, retain the original URL or cancel this link and create a replacement.

get_connection_link

Poll a human-calendar setup request. Returns provider-neutral status and resulting connection ID when complete, but never replays the bearer setup URL or exposes human calendar data.

proposal

create_proposal

Create a scheduling proposal — send a set of candidate time slots to one or more participant agents so they can accept, decline, or counter-propose. The organizer agent owns the proposal; once every participant responds, the system auto-resolves to the highest-scoring slot (or cancels if all decline). Requires an org-level API key. Pro plan only.

get_proposal

Get a scheduling proposal by id, including its slots and per-participant responses. Requires an org-level API key.

scoped

create_scoped_key

Create an agent-scoped API key (chr_ak_*) that can only act on behalf of a single agent. Use this to self-provision or rotate per-agent credentials. The plaintext key is returned exactly once in the response — store it immediately, it cannot be retrieved later. Requires an org-level API key.

list_scoped_keys

List all live (non-revoked) agent-scoped API keys for this org. Returns key metadata only (id, prefix, agent_id, label, created_at) — never the plaintext secret. Requires an org-level API key.

accept_terms

Re-accept the current Chronary terms of service on behalf of the calling org. Use this when responses carry the Chronary-Terms-Upgrade-Required header — a material ToS bump otherwise leaves MCP-only agents stuck without a console session. Pass the current tos_version (read it from GET /v1/auth/terms/current). Requires an org-level API key (chr_sk_*); agent-scoped keys cannot accept org-wide terms.

agents

list_agents

List all agents in your organization

audit

get_audit_log

List audit-log entries for the calling org — mutating operations and auth-lifecycle events, newest first. Results are clamped to the plan's retention window. Requires an org-level API key (chr_sk_*); agent-scoped keys cannot read the org-wide audit log.

billing

get_billing

Get the org's plan, subscription status, renewal or cancellation date, Pro pricing, and any pending upgrade request. Works even when the org is at its usage limit. Requires an org-level API key (chr_sk_*).

calendars

list_calendars

List calendars in the org. Org-level API keys see every calendar (agent-owned and shared); agent-scoped keys see only their own agent's calendars. Use this to discover calendar IDs before creating or listing events.

clear

clear_availability_rules

Remove the availability rules from a calendar, reverting to the default (no buffers, no working-hours mask). Returns the deleted row, or an error if none were set.

confirm

confirm_event

Promote a held event to a confirmed booking. The event must currently have status="hold" and its hold_expires_at must not have passed. After confirmation, event.started and event.ended lifecycle webhooks fire at the scheduled times.

events

list_events

List events on a calendar or across an agent's calendars, including internally created events and externally synced events from iCal subscriptions (e.g. Google Calendar, Outlook). Provide `calendar_id` OR `agent_id`. Narrow with `start_after`/`start_before` (time window), `status`, and `source`.

meeting

find_meeting_time

Find slots when multiple agents are free across Chronary calendars and any human calendars authorized for each agent. This tool is fail-closed: always inspect `availability_state` and `warnings` before using slots. Accepts `agents`/`start`/`end` or their aliases.

proposals

list_proposals

List scheduling proposals for the org. Filter by status (pending|confirmed|expired|cancelled) or organizer_agent_id. Requires an org-level API key.

release

release_event

Manually release a held event before its hold_expires_at. The event must currently have status="hold". Frees the slot for other agents to book.

request

request_upgrade

Ask your human to upgrade this Chronary account to Pro. Returns approval_url — give it to your human; only a human can pay. If reused=true a request is already pending — do not call again; poll get_upgrade_request at most once a minute.

resolve

resolve_proposal

Force-resolve an open proposal using responses collected so far. Picks the highest-scoring slot among those accepted by the most participants and creates a confirmed calendar event. If every response was "decline", the proposal is cancelled instead. Use when you want to close out a proposal without waiting for every participant. Requires an org-level API key. Pro plan only.

respond

respond_to_proposal

Submit a response (accept / decline / counter) on behalf of one participant agent to an open proposal. An "accept" requires the slot id from the proposal; a "counter" can suggest alternative slots. When all participants have responded the proposal auto-resolves — no separate resolve call needed in the normal flow. Requires an org-level API key. Pro plan only.

revoke

revoke_scoped_key

Revoke an agent-scoped API key by ID. Revocation is permanent (cannot be un-revoked); the key stops authenticating within about a minute. Requires an org-level API key.

subscribe_ical

Link an external iCal feed (e.g. a human's Google Calendar) to an agent's calendar so external events appear in availability calculations. The target calendar must be owned by the specified agent — create the calendar with that agent_id first (org-level calendars without an agent_id cannot host external iCal subscriptions; create a dedicated per-agent calendar for sync targets).

sync

sync_ical_subscription

Trigger an immediate sync of an external iCal feed subscription instead of waiting for the next scheduled poll. Returns once the sync has been queued.

upgrade

get_upgrade_request

Check an upgrade request (pending, completed, declined, canceled, expired). Poll at most once a minute; after completed, wait ~15 seconds before retrying the call that hit the plan limit.

usage

get_usage

Get the calling org's current-period usage and plan limits (agents, calendars, events, API calls, webhooks, availability queries, iCal subscriptions, proposals, scoped keys, holds, cross-calendar queries). Requires an org-level API key (chr_sk_*); agent-scoped keys cannot read org-wide usage.

webhooks

list_webhooks

List the org's webhook subscriptions with their subscribed event types and active state. Signing secrets are never returned. Requires an org-level API key.

Endpoints

URL	Transport	State	Latency	Checked
https://api.chronary.ai/mcp	streamable-http	answering	146 ms	4 min ago

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Chronary — questions

Answers built from our own checks of this server.

What can Chronary do?

It exposes 58 tools, read directly from the server on our last check. Among them: accept_terms, cancel_connection_link, cancel_event, cancel_proposal, cancel_upgrade_request, clear_availability_rules and 52 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is Chronary mostly used for?

Its tools cluster around calendar, webhook and ical. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is Chronary working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 326 ms. The bar chart above shows every period we have measured.

How do I connect Chronary?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Chronary need an API key?

No. Chronary completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 58 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Chronary?

It answers our handshake in 326 ms on average, which is faster than 44% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Chronary?

The npm package @chronary/mcp was installed 254 times in the last week. Week over week that is +1%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Chronary open source?

The code is open source: it is published under the Apache-2.0 licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at api.chronary.ai, which runs on its operator's own terms.