zcalzcal.co

Can an AI agent use zcal?

As of 6 Oct 2026, an AI agent can't use zcal on its own: Cloudflare Turnstile on the sign-up form.

Level 0 · Read-onlyAgents can read about it, but there is nothing to use.

Find: Some docs for agents: llms.txt.
Access: Can't sign up.
Use: Work not reached.
Pay: Payment not reached.
Leave: Leaving not reached.

No API, CLI or MCP to drive it with

What the levels mean

Visit zcal Follow changes

Driven 6 Oct 20261 drive so farRules of 15 Oct 2026Claim this page

Written and checked by our agents from this drive's record. How we write.

Who gets in

Agents on a serverTurned away when they send the sign-up form.
Signed agentsThe sign-up page opens. The check on the form still applies.
Agents in a person's browserNot measured yet.

Sign-up page checked 13 Oct 2026. Signed agents: the ones Cloudflare verifies. Where agents come from

What an agent can do in zcal.

In the web editor

zcal has no API, CLI or MCP server, so it's L0. Our agent did these in the web editor, as a person would.

Read the full help docs as Markdown (llms.txt, .md URLs, Accept: text/markdown) without an account

What it can't, and why

Create an accountVisible Cloudflare Turnstile on the sign-up form rejected our agent's browser
Create, book, reschedule or cancel invites, polls or group invitesNeeds an account; and zcal has no API, CLI or MCP server, only the web app
Get API credentialszcal offers no public API

Needs a person

No. Sign-up: needs a human. No headless route: sign-up is web only (Google, Microsoft or email form). The email form at zcal.co/signup/local has a visible Cloudflare Turnstile 'Verify you are human'; our agent's browser got 'We could not verify your browser'.

No MCP server found

Does zcal have an MCP server, and can an agent connect to it?

No. The drive found no MCP server for zcal.

A new agent can't get in on its own: in the drive of 6 Oct 2026, our agent stopped at sign up (it needs a person).

What the drive found

–API–OpenAPI–MCP–CLI–SDKllms.txtWebhooks–Sandbox

Not reached in this drive: the API key, deleting the account and paying. Every checkpoint, in detail

For the team behind zcal.

Where agents stop in zcal today, and the fixes that get them further, highest impact first.

Stops at sign up

The fixes, highest impact first

Let verified signed agents past TurnstileStep-by-step guide
Publish an API for invites and bookings
Offer an API key or OAuth for agents

1 more fix

Ship an MCP server for scheduling

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Behind the level.

Our agent couldn't get into zcal, so the work, its reliability and the crash test aren't measured. The part scores are what it could judge from the outside.

Part scores · paid plans

Part scores

Agent-ready setup

llms.txt: found
OpenAPI: not found
MCP server: not found
CLI: not found

Not measured in this drive: Holds up, Docs match (part of an Audit).

Needs a paid plan

Not counted in the level.

Needs a paid plan
Capability	Plan
Create a team and collective/round-robin scheduling	Pro

For agents and builders.

The drive as data, every checkpoint and all 17 attempts.

How an agent connects · 4 tips

/api/tools/zcal.json /tools/zcal.mdMCP get_tool {"slug":"zcal"}

There is no zcal API: everything happens in the web app at zcal.co.
Docs: fetch https://help.zcal.co/llms.txt and append .md to any help page.
Sign-up has a Cloudflare Turnstile; plan for a human to create the account.
Booking events reach you only as outbound webhooks or via Zapier, configured in the web UI.

Every checkpoint, in detail · 9 checkpoints

DocsHeadlesshelp.zcal.co (GitBook) serves llms.txt (text/markdown), .md page URLs, and text/markdown on Accept negotiation. zcal.co/llms.txt is an SPA soft-404.
Sign upNeeds a humanNo headless route: sign-up is web only (Google, Microsoft or email form). The email form at zcal.co/signup/local has a visible Cloudflare Turnstile 'Verify you are human'; our agent's browser got 'We could not verify your browser'.
VerifyNot reachedNot reached: no account was created, so no verification mail was expected.
KeyNot reachedzcal has no public API, API key, OAuth app, CLI, SDK or MCP server in its docs; only outbound webhooks and Zapier, set up in the web app after sign-up.
First callNot reachedNo API to call; the web app needs an account, which sits behind Turnstile.
First actionNot reachedNo account, so no invite link could be created.
PayNot reachedNo 402, no x402/MPP/UCP, not in mpp.dev or the x402 Bazaar. Pricing page: 14-day free trial of Pro and Business; billing via zcal.co/account > Manage Billing (Stripe portal). Whether the trial needs a card is unknown. Buying needs an account, and the account needs a human past Turnstile.
CancelNot reachedDocs (pricing/payments-and-billing.md): cancel in the Stripe portal via zcal.co/account > Manage Billing > Cancel Plan, web UI only. Not exercised: no plan started.
DeleteNot reachedThe web app has a 'Delete account' action (string in the app bundle), web UI only; no API. Not exercised: no account existed. Nothing was created, so nothing to clean up.

The attempt log · 17 attempts

Attempt log
Capability	Route	Result	Evidence
llms.txt: Fetch llms.txt on zcal.co and help.zcal.co	api	done ✓	https://help.zcal.co/llms.txt 200 text/markdown (GitBook index, 60+ pages). https://zcal.co/llms.txt 200 text/html 38680 B = SPA soft-404.
markdown docs: Accept: text/markdown and .md URL on help.zcal.co	api	done ✓	GET help.zcal.co/getting-started with Accept: text/markdown -> content-type text/markdown, vary includes Accept; .md URLs also served (getting-started.md).
mcp: Probe zcal.co/mcp with server/discover (2026-07-28)	mcp	failed ✓	POST https://zcal.co/mcp -> HTTP 404 text/html. GET /mcp -> SPA HTML. No MCP server found; none in docs.
cards/well-known: ai-catalog, agent-card, agent.json, oauth-protected-resource, oauth-authorization-server, ucp, auth.md, SKILL.md, openapi.json	api	failed ✓	All return 200 text/html 38680 B (SPA soft-404); no JSON. api.zcal.co, x402./mpp./agents.zcal.co do not resolve (curl 000).
aipref: robots.txt and headers	api	done ✓	robots.txt: 'User-Agent: * / Disallow: /?via= / Disallow: /cdn-cgi/' + Sitemap; no Content-Usage or Content-signal line; no Content-Usage header on /.
pay step probe: Look for 402 rails, registries, billing API	api	done ✓	No 402 on any path; zcal not in mpp.dev/api/services nor CDP x402 Bazaar; help pricing/payments-and-billing.md: billing via zcal.co/account > Manage Billing > Stripe portal; pricing page mentions free trial of Pro and Business.
Sign up: Sign up with email at zcal.co/signup/local	browser	blocked ✓	No headless sign-up route documented (help getting-started.md: Google/Microsoft login or email address, web only). Browser form at /signup/local shows a visible Cloudflare Turnstile 'Verify you are human' widget (CHECK_TURNSTILE_ON:!0 in main chunk); submitting gave toast 'We could not verify your browser. Please refresh the page and try again.' Screenshot browser/shots/003.png.
Sign up: Human handoff (own browser) for the Turnstile on sign-up	browser	blocked	(Cloudflare Turnstile).
API credentials: Find an API key / OAuth / MCP route in docs	none	blocked ✓	help.zcal.co/llms.txt lists 60+ pages: no API, no API key, no OAuth app, no CLI, no SDK, no MCP. Only outbound webhooks (integrations/webhooks.md) and Zapier, both configured in the web app after sign-up.
Create an invite link (one-on-one): Attempt create an invite link (one-on-one)	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/getting-started.md) describe a web UI route only.
Invitee books a time slot on an invite: Attempt invitee books a time slot on an invite	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/master.md) describe a web UI route only.
Design/customize invite page (theme, fonts, colors, layout, media): Attempt design/customize invite page (theme, fonts, colors, layout, media)	none	blocked	No API/MCP/CLI exists for this; docs (https://zcal.co/) describe a web UI route only.
Connect and sync calendars (Google/Outlook/Apple) to block busy times: Attempt connect and sync calendars (google/outlook/apple) to block busy times	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/calendar/overview.md) describe a web UI route only.
Create a team and collective/round-robin scheduling: Attempt create a team and collective/round-robin scheduling	none	plan_gated	help.zcal.co/pricing/pro-plan.md lists Team creation, Round robin, Collective scheduling under Pro; also unreachable here: no account (sign-up blocked by Cloudflare Turnstile).
Run a meeting poll (vote on candidate times, finalize winner): Attempt run a meeting poll (vote on candidate times, finalize winner)	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/other-link-types/meeting-polls.md) describe a web UI route only.
Run a group invite (many invitees book same slot): Attempt run a group invite (many invitees book same slot)	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/other-link-types/group-invites.md) describe a web UI route only.
Reschedule or cancel a booked event: Attempt reschedule or cancel a booked event	none	blocked	No API/MCP/CLI exists for this; docs (https://help.zcal.co/integrations/webhooks.md) describe a web UI route only.